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126-626: Midvale Steel was a succession of steel -making corporations whose flagship plant was the Midvale Steel Works in Nicetown, Philadelphia, Pennsylvania . The mill operated from 1867 until 1976. In the 1880s, Frederick Winslow Taylor rose through the ranks at Midvale, from lathe operator, to gang boss, to engineer, to chief engineer of the works. During this time he developed the core of his philosophy of scientific management . Midvale produced high-quality steels (including many alloy steels ) and

252-493: A heat wave during the summer, no mass health crises occurred. Philadelphia passed an ordinance that authorized Mayor William S. Stokley to appoint 500 men as Centennial Guards for the exposition. Among soldiers and local men hired by the city was Frank Geyer , best known for investigating one of America's first serial killers, H. H. Holmes . Centennial Guards policed exhibits, kept the peace, reunited lost children, and received, recorded, and when possible, returned lost items,

378-412: A BOS process is manufactured in one-twelfth the time. Today, electric arc furnaces (EAF) are a common method of reprocessing scrap metal to create new steel. They can also be used for converting pig iron to steel, but they use a lot of electrical energy (about 440 kWh per metric ton), and are thus generally only economical when there is a plentiful supply of cheap electricity. The steel industry

504-532: A brick and marble foundation and was 383 ft (117 m) long, 193 ft (59 m) wide, and 68 ft (21 m) tall. The building was designed in the Moorish style and intended as a tribute to the Crystal Palace of London 's Great Exhibition of 1851. Inside, nurserymen, florists, and landscape architects exhibited a variety of tropical plants, garden equipment, and garden plans. In dramatic fashion,

630-684: A carbon-intermediate steel by the 1st century AD. There is evidence that carbon steel was made in Western Tanzania by the ancestors of the Haya people as early as 2,000 years ago by a complex process of "pre-heating" allowing temperatures inside a furnace to reach 1300 to 1400 °C. Evidence of the earliest production of high carbon steel in South Asia is found in Kodumanal in Tamil Nadu ,

756-444: A change of volume. In this case, expansion occurs. Internal stresses from this expansion generally take the form of compression on the crystals of martensite and tension on the remaining ferrite, with a fair amount of shear on both constituents. If quenching is done improperly, the internal stresses can cause a part to shatter as it cools. At the very least, they cause internal work hardening and other microscopic imperfections. It

882-490: A fence nearly three miles long. There were five main buildings in the exposition. They were the Main Exhibition Building, Memorial Hall, Machinery Hall, Agricultural Hall, and Horticultural Hall. Apart from these buildings, there were separate buildings for state, federal, foreign, corporate, and public comfort buildings. This strategy of numerous buildings in one exposition set it apart from the previous fairs around

1008-428: A ferrite BCC crystal form, but at higher carbon content it takes a body-centred tetragonal (BCT) structure. There is no thermal activation energy for the transformation from austenite to martensite. There is no compositional change so the atoms generally retain their same neighbours. Martensite has a lower density (it expands during the cooling) than does austenite, so that the transformation between them results in

1134-640: A great-granddaughter of Benjamin Franklin , as president. In its first few months, the group raised $ 40,000. When the group learned the planning commission was not doing much to display the work of women, it raised an additional $ 30,000 for a women's exhibition building. In 1873, the Centennial Commission named Alfred T. Goshorn as the director general of the Exposition. The Fairmount Park Commission set aside 450 acres (1.8 km ) of West Fairmount Park for

1260-445: A hard but brittle martensitic structure. The steel is then tempered, which is just a specialized type of annealing, to reduce brittleness. In this application the annealing (tempering) process transforms some of the martensite into cementite, or spheroidite and hence it reduces the internal stresses and defects. The result is a more ductile and fracture-resistant steel. When iron is smelted from its ore, it contains more carbon than

1386-532: A loan. The board initially thought it was a subsidy . But after the exposition ended, the federal government sued to have the money returned, and the United States Supreme Court ultimately forced repayment. John Welsh enlisted help from the women of Philadelphia who had helped him in the Great Sanitary Fair. A Women's Centennial Executive Committee was formed with Elizabeth Duane Gillespie,

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1512-412: A narrow range of concentrations of mixtures of carbon and iron that make steel, several different metallurgical structures, with very different properties can form. Understanding such properties is essential to making quality steel. At room temperature , the most stable form of pure iron is the body-centred cubic (BCC) structure called alpha iron or α-iron. It is a fairly soft metal that can dissolve only

1638-465: A pavilion devoted entirely to the artistic and industrial pursuits of their gender. They had to build their own structure because they lost their spot in one of the larger pavilions (the Main Building) due to an unexpected increase in the participation of foreign countries. Their aim was to employ only women in the construction of the pavilion and even to power it, and they succeeded with the exception of

1764-461: A popular means for justifying female autonomy outside of the home by demonstrating to visitors the many ways women were making a profitable living. Exhibits demonstrated positive achievements and women's influence in domains such as industrial and fine arts (wood-carvings, furniture-making, and ceramics), fancy articles (clothing and woven goods), and philanthropy as well as philosophy, science, medicine, education, and literature. Mexico participated in

1890-726: A professor of mathematics, natural philosophy , and astronomy at Wabash College in Crawfordsville, Indiana . In December 1866, Campbell suggested to Philadelphia Mayor Morton McMichael that the United States Centennial be celebrated with an exposition in Philadelphia. Naysayers argued that the project would not be able to find funding, other nations might not attend, and domestic exhibits might compare poorly to foreign ones. The Franklin Institute became an early supporter of

2016-521: A scion of the Sheffield, England steel industry) and Philip Syng Justice (an American manufacturer) planned to produce were cast-steel locomotive tires (that is, in British spelling, tyres ) and cast-steel forgings, with a plan to make eventually a promising new product: steel rails, which would be far superior to older iron ones. At about this time in nearby Bethlehem, the predecessor company of Bethlehem Steel

2142-450: A separate annex was built to house them all. Another structure was built for the display of photography . Memorial Hall was designed by Herman J. Schwarzmann, who basically adopted an art museum plan submitted by Nicholas Félix Escalier to the Prix de Rome competition in 1867–69. Memorial Hall became the prototype, both from a stylistic and organizational standpoint, for other museums such as

2268-534: A small concentration of carbon, no more than 0.005% at 0 °C (32 °F) and 0.021 wt% at 723 °C (1,333 °F). The inclusion of carbon in alpha iron is called ferrite . At 910 °C, pure iron transforms into a face-centred cubic (FCC) structure, called gamma iron or γ-iron. The inclusion of carbon in gamma iron is called austenite. The more open FCC structure of austenite can dissolve considerably more carbon, as much as 2.1%, (38 times that of ferrite) carbon at 1,148 °C (2,098 °F), which reflects

2394-448: A steel's final rolling, it is heat treated for strength; however, this is relatively rare. Steel was known in antiquity and was produced in bloomeries and crucibles . The earliest known production of steel is seen in pieces of ironware excavated from an archaeological site in Anatolia ( Kaman-Kalehöyük ) which are nearly 4,000 years old, dating from 1800 BC. Wootz steel

2520-672: Is continuously cast into long slabs, cut and shaped into bars and extrusions and heat treated to produce a final product. Today, approximately 96% of steel is continuously cast, while only 4% is produced as ingots. The ingots are then heated in a soaking pit and hot rolled into slabs, billets , or blooms . Slabs are hot or cold rolled into sheet metal or plates. Billets are hot or cold rolled into bars, rods, and wire. Blooms are hot or cold rolled into structural steel , such as I-beams and rails . In modern steel mills these processes often occur in one assembly line , with ore coming in and finished steel products coming out. Sometimes after

2646-403: Is common for quench cracks to form when steel is water quenched, although they may not always be visible. There are many types of heat treating processes available to steel. The most common are annealing , quenching , and tempering . Annealing is the process of heating the steel to a sufficiently high temperature to relieve local internal stresses. It does not create a general softening of

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2772-403: Is desirable. To become steel, it must be reprocessed to reduce the carbon to the correct amount, at which point other elements can be added. In the past, steel facilities would cast the raw steel product into ingots which would be stored until use in further refinement processes that resulted in the finished product. In modern facilities, the initial product is close to the final composition and

2898-449: Is distinguishable from wrought iron (now largely obsolete), which may contain a small amount of carbon but large amounts of slag . Iron is commonly found in the Earth's crust in the form of an ore , usually an iron oxide, such as magnetite or hematite . Iron is extracted from iron ore by removing the oxygen through its combination with a preferred chemical partner such as carbon which

3024-408: Is heat treated to contain both a ferritic and martensitic microstructure to produce a formable, high strength steel. Transformation Induced Plasticity (TRIP) steel involves special alloying and heat treatments to stabilize amounts of austenite at room temperature in normally austenite-free low-alloy ferritic steels. By applying strain, the austenite undergoes a phase transition to martensite without

3150-535: Is known as stainless steel . Tungsten slows the formation of cementite , keeping carbon in the iron matrix and allowing martensite to preferentially form at slower quench rates, resulting in high-speed steel . The addition of lead and sulphur decrease grain size, thereby making the steel easier to turn , but also more brittle and prone to corrosion. Such alloys are nevertheless frequently used for components such as nuts, bolts, and washers in applications where toughness and corrosion resistance are not paramount. For

3276-646: Is now the University of the Arts . Used for a time as a police station, the building now houses the Please Touch Museum , which includes a faithful 20x30-foot model of the exposition grounds and 200 buildings. The Women's Pavilion was the first structure at an international exposition to highlight the work of women, with exhibits created and operated by women. Female organizers drew upon deep-rooted traditions of separatism and sorority in planning, fundraising, and managing

3402-687: Is often considered an indicator of economic progress, because of the critical role played by steel in infrastructural and overall economic development . In 1980, there were more than 500,000 U.S. steelworkers. By 2000, the number of steelworkers had fallen to 224,000. The economic boom in China and India caused a massive increase in the demand for steel. Between 2000 and 2005, world steel demand increased by 6%. Since 2000, several Indian and Chinese steel firms have expanded to meet demand, such as Tata Steel (which bought Corus Group in 2007), Baosteel Group and Shagang Group . As of 2017 , though, ArcelorMittal

3528-507: Is one of the largest manufacturing industries in the world, but also one of the most energy and greenhouse gas emission intense industries, contributing 8% of global emissions. However, steel is also very reusable: it is one of the world's most-recycled materials, with a recycling rate of over 60% globally . The noun steel originates from the Proto-Germanic adjective * * stahliją or * * stakhlijan 'made of steel', which

3654-463: Is one of the most commonly manufactured materials in the world. Steel is used in buildings, as concrete reinforcing rods, in bridges, infrastructure, tools, ships, trains, cars, bicycles, machines, electrical appliances, furniture, and weapons. Iron is always the main element in steel, but many other elements may be present or added. Stainless steels , which are resistant to corrosion and oxidation , typically need an additional 11% chromium . Iron

3780-544: Is one of the world's most-recycled materials, with a recycling rate of over 60% globally; in the United States alone, over 82,000,000 metric tons (81,000,000 long tons; 90,000,000 short tons) were recycled in the year 2008, for an overall recycling rate of 83%. As more steel is produced than is scrapped, the amount of recycled raw materials is about 40% of the total of steel produced - in 2016, 1,628,000,000 tonnes (1.602 × 10 long tons; 1.795 × 10 short tons) of crude steel

3906-510: Is possible only by reducing iron's ductility. Steel was produced in bloomery furnaces for thousands of years, but its large-scale, industrial use began only after more efficient production methods were devised in the 17th century, with the introduction of the blast furnace and production of crucible steel . This was followed by the Bessemer process in England in the mid-19th century, and then by

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4032-434: Is possible to make very high-carbon (and other alloy material) steels, but such are not common. Cast iron is not malleable even when hot, but it can be formed by casting as it has a lower melting point than steel and good castability properties. Certain compositions of cast iron, while retaining the economies of melting and casting, can be heat treated after casting to make malleable iron or ductile iron objects. Steel

4158-400: Is quite ductile , or soft and easily formed. In steel, small amounts of carbon, other elements, and inclusions within the iron act as hardening agents that prevent the movement of dislocations . The carbon in typical steel alloys may contribute up to 2.14% of its weight. Varying the amount of carbon and many other alloying elements, as well as controlling their chemical and physical makeup in

4284-457: Is related to * * stahlaz or * * stahliją 'standing firm'. The carbon content of steel is between 0.02% and 2.14% by weight for plain carbon steel ( iron - carbon alloys ). Too little carbon content leaves (pure) iron quite soft, ductile, and weak. Carbon contents higher than those of steel make a brittle alloy commonly called pig iron . Alloy steel is steel to which other alloying elements have been intentionally added to modify

4410-441: Is the base metal of steel. Depending on the temperature, it can take two crystalline forms (allotropic forms): body-centred cubic and face-centred cubic . The interaction of the allotropes of iron with the alloying elements, primarily carbon, gives steel and cast iron their range of unique properties. In pure iron, the crystal structure has relatively little resistance to the iron atoms slipping past one another, and so pure iron

4536-529: Is the world's largest steel producer . In 2005, the British Geological Survey stated China was the top steel producer with about one-third of the world share; Japan , Russia , and the United States were second, third, and fourth, respectively, according to the survey. The large production capacity of steel results also in a significant amount of carbon dioxide emissions inherent related to

4662-498: Is then lost to the atmosphere as carbon dioxide. This process, known as smelting , was first applied to metals with lower melting points, such as tin , which melts at about 250 °C (482 °F), and copper , which melts at about 1,100 °C (2,010 °F), and the combination, bronze, which has a melting point lower than 1,083 °C (1,981 °F). In comparison, cast iron melts at about 1,375 °C (2,507 °F). Small quantities of iron were smelted in ancient times, in

4788-987: The Art Institute of Chicago (1892–1893), the Milwaukee Public Museum (1893–1897), the Brooklyn Museum (1893–1924), and the Detroit Institute of Art (1920–1927). Libraries such as the Library of Congress , the New York Public Library , and the Free Library of Philadelphia also emulated its form. Finally, Memorial Hall was the architectural inspiration for the German capitol, the Reichstag building in Berlin. After

4914-631: The Golconda area in Andhra Pradesh and Karnataka , regions of India , as well as in Samanalawewa and Dehigaha Alakanda, regions of Sri Lanka . This came to be known as wootz steel , produced in South India by about the sixth century BC and exported globally. The steel technology existed prior to 326 BC in the region as they are mentioned in literature of Sangam Tamil , Arabic, and Latin as

5040-575: The U.S. War Department domestic alternatives to buying from Krupp.) An influential product of theirs since the 1910s and constantly improved through the 1930s was the Midvale Unbreakable capped armor-piercing projectiles for warships. Their innovation attempts at armor-making were less successful. Steel Steel is an alloy of iron and carbon with improved strength and fracture resistance compared to other forms of iron. Because of its high tensile strength and low cost, steel

5166-554: The beaux-arts style , it was the largest art hall in the country when it opened, with a massive 1.5-acre (0.61 ha) footprint and a 150 ft (46 m) dome atop a 59 ft (18 m)-high structure. The central domed area is surrounded by four pavilions on the corners, with open arcades to the east and west of the main entrance. It provided 75,000 sq ft (7,000 m ) of wall surface for paintings and 20,000 sq ft (1,900 m ) of floor space for sculptures. The exposition received so many art contributions that

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5292-486: The casting , forging , and machining needed to use them in special applications such as heavy artillery ( naval , coastal , and field ); steam turbines ; naval armor plate ; and pressure vessels for use in chemical plants (for example, petroleum refineries ). Midvale also helped pioneer the steel formulas used in the early automotive industry . Midvale was never a particularly large company (relative to giants such as Carnegie , Bethlehem , and U.S. Steel ), and

5418-586: The cementation process was described in a treatise published in Prague in 1574 and was in use in Nuremberg from 1601. A similar process for case hardening armour and files was described in a book published in Naples in 1589. The process was introduced to England in about 1614 and used to produce such steel by Sir Basil Brooke at Coalbrookdale during the 1610s. The raw material for this process were bars of iron. During

5544-592: The open-hearth furnace . With the invention of the Bessemer process, a new era of mass-produced steel began. Mild steel replaced wrought iron . The German states were the major steel producers in Europe in the 19th century. American steel production was centred in Pittsburgh , Bethlehem, Pennsylvania , and Cleveland until the late 20th century. Currently, world steel production is centered in China, which produced 54% of

5670-445: The 17th century, it was realized that the best steel came from oregrounds iron of a region north of Stockholm , Sweden. This was still the usual raw material source in the 19th century, almost as long as the process was used. Crucible steel is steel that has been melted in a crucible rather than having been forged , with the result that it is more homogeneous. Most previous furnaces could not reach high enough temperatures to melt

5796-470: The 17th century, the first step in European steel production has been the smelting of iron ore into pig iron in a blast furnace . Originally employing charcoal, modern methods use coke , which has proven more economical. In these processes, pig iron made from raw iron ore was refined (fined) in a finery forge to produce bar iron , which was then used in steel-making. The production of steel by

5922-600: The Arabs from Persia, who took it from India. It was originally created from several different materials including various trace elements , apparently ultimately from the writings of Zosimos of Panopolis . In 327 BC, Alexander the Great was rewarded by the defeated King Porus , not with gold or silver but with 30 pounds of steel. A recent study has speculated that carbon nanotubes were included in its structure, which might explain some of its legendary qualities, though, given

6048-610: The Centennial or on trains heading for Philadelphia. Philadelphia streetcars increased service, and the Pennsylvania Railroad ran special trains from Philadelphia's Market Street , New York City , Baltimore , and Pittsburgh . The Philadelphia and Reading Railroad ran special trains from the Center City part of Philadelphia. A small hospital was built on the exposition's grounds by the Centennial's Medical Bureau, but despite

6174-592: The Exposition, six from typhoid fever , one from smallpox , and one from organic disease of the heart. The Centennial National Bank was chartered on January 19, 1876, to be the "financial agent of the board at the Centennial Exhibition, receiving and accounting for daily receipts, changing foreign moneys into current funds, etc.," according to an article three days later in The Philadelphia Inquirer . Its main branch, designed by Frank Furness ,

6300-558: The Exposition, the building continued to be used for horticultural exhibits until it was severely damaged by Hurricane Hazel in 1954 and was subsequently demolished. As a replacement, the Fairmount Park Horticulture Center was built on the site in 1976 as part of the United States Bicentennial exposition. Designed by Joseph M. Wilson and Henry Pettit, Machinery Hall was the second largest structure in

6426-599: The Great Sanitary Fair, was one of the many United States Sanitary Commission 's Sanitary Fairs held during the American Civil War . The fairs provided a creative and communal means for ordinary citizens to promote the welfare of Union Army soldiers and dedicate themselves to the survival of the nation, and the Great Central Fair bolstered Philadelphia's role as a vital center in the Union war effort. It anticipated

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6552-463: The Linz-Donawitz process of basic oxygen steelmaking (BOS), developed in 1952, and other oxygen steel making methods. Basic oxygen steelmaking is superior to previous steelmaking methods because the oxygen pumped into the furnace limited impurities, primarily nitrogen, that previously had entered from the air used, and because, with respect to the open hearth process, the same quantity of steel from

6678-485: The Main Exhibition Building dealt with mining , metallurgy , manufacturing , education, and science. Offices for foreign commissioners were placed in proximity to the products exhibited along in the aisles along the sides of the building. The walkways leading to the exit doors were ten feet wide. After the Exposition, the structure was turned into a permanent building for the International Exhibition. During

6804-726: The Maryland House, which was moved to Druid Hill Park in Baltimore , where it is extant today, and the Missouri House, which was moved to Spring Lake, New Jersey , along with several other exhibition buildings, some of which are still extant in various Jersey Shore towns. The United States government had a cross-shaped building that held exhibits from various government departments. The remaining structures were corporate exhibitions, administration buildings, restaurants, and other buildings designed for public comfort. The formal name of

6930-539: The United States. On June 1, 1872, Congress created a Centennial Board of Finance to help raise money. The board's president was John Welsh , brother of philanthropist William Welsh, who had raised funds for the Great Sanitary Fair in 1864. The board was authorized to sell up to $ 10 million in stock via $ 10 shares. The board sold $ 1,784,320 ($ 45,381,205 in 2023 ) worth of shares by February 22, 1873. Philadelphia contributed $ 1.5 million and Pennsylvania gave $ 1 million. On February 11, 1876, Congress appropriated $ 1.5 million in

7056-615: The Women's Pavilion was commissioned in 1873 by the United States Centennial Board of Finance with the expectation that it would generate enthusiasm for the celebration of the fair and increase subscriptions to exposition stock. Elizabeth Duane Gillespie, president of the Women's Centennial Committee, led the effort to gather 82,000 signatures in two days to raise money for the pavilion. Gillespie also helped convince Congress to grant additional funding. It took only four months to raise

7182-600: The World War II era, appears to have been the son of Charles A. Brinley, Midvale's metallurgical leader. Besides the railroad industry, one of the most important client industries for Midvale became armaments. During the late 19th and early 20th centuries, among many American steel companies, Bethlehem Steel and Midvale Steel especially, became the Krupps of the Americas. (In fact, they built their armament businesses largely on offering

7308-582: The addition of heat. Twinning Induced Plasticity (TWIP) steel uses a specific type of strain to increase the effectiveness of work hardening on the alloy. Centennial Exposition The Centennial International Exhibition , officially the International Exhibition of Arts, Manufactures, and Products of the Soil and Mine , was held in Philadelphia , Pennsylvania, from May 10 to November 10, 1876. It

7434-402: The auction held on December 1, 1876, it was bought for $ 250,000. It quickly ran into financial difficulties but remained open through 1879 and was finally demolished in 1881. The third-largest structure at the exposition was Agricultural Hall. Designed by James H. Windrim , Agricultural Hall was 820 ft (250 m) long and 540 ft (160 m) wide. Made of wood and glass, the building

7560-436: The austenite grain boundaries until the percentage of carbon in the grains has decreased to the eutectoid composition (0.8% carbon), at which point the pearlite structure forms. For steels that have less than 0.8% carbon (hypoeutectoid), ferrite will first form within the grains until the remaining composition rises to 0.8% of carbon, at which point the pearlite structure will form. No large inclusions of cementite will form at

7686-471: The austenite is for it to precipitate out of solution as cementite , leaving behind a surrounding phase of BCC iron called ferrite with a small percentage of carbon in solution. The two, cementite and ferrite, precipitate simultaneously producing a layered structure called pearlite , named for its resemblance to mother of pearl . In a hypereutectoid composition (greater than 0.8% carbon), the carbon will first precipitate out as large inclusions of cementite at

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7812-494: The boundaries in hypoeutectoid steel. The above assumes that the cooling process is very slow, allowing enough time for the carbon to migrate. As the rate of cooling is increased the carbon will have less time to migrate to form carbide at the grain boundaries but will have increasingly large amounts of pearlite of a finer and finer structure within the grains; hence the carbide is more widely dispersed and acts to prevent slip of defects within those grains, resulting in hardening of

7938-481: The building was east–west in direction, making it well lit, and glass was used between the frames to let in light. Skylights were set over the central aisles of the structure. The corridors of the building were separated by fountains that were attractive and also provided cooling. The structure of the building featured a central avenue with a series of parallel sheds that were 120 ft (37 m) wide, 1,832 ft (558 m) long, and 75 ft (23 m) high. It

8064-423: The building's corners. These towers had small balconies at different heights that served as observation galleries. Within the building, exhibits were arranged in a grid, in a dual arrangement of type and national origin. Exhibits from the United States were placed in the center of the building, and foreign exhibits were arranged around the center, based on the nation's distance from the United States. Exhibits inside

8190-521: The characteristics of steel. Common alloying elements include: manganese , nickel , chromium , molybdenum , boron , titanium , vanadium , tungsten , cobalt , and niobium . Additional elements, most frequently considered undesirable, are also important in steel: phosphorus , sulphur , silicon , and traces of oxygen , nitrogen , and copper . Plain carbon-iron alloys with a higher than 2.1% carbon content are known as cast iron . With modern steelmaking techniques such as powder metal forming, it

8316-471: The combination of public, private, and commercial investments that were necessary to mount the Centennial Exposition. Both had a similar neo-Gothic appearance, including the waving flags, a huge central hall, the "curiosities" and relics, handmade and industrial exhibits, and also a visit from the U.S. president and his family. The idea of the Centennial Exposition is credited to John L. Campbell,

8442-403: The design by Hermann J. Schwarzmann. Their overarching goal was to advance women's social, economic, and legal standing, abolish restrictions discriminating against their gender, encourage sexual harmony, and gain influence, leverage, and freedom for all women in and outside of the home by increasing women's confidence and ability to choose. A project of the Women's Centennial Executive Committee,

8568-422: The desired properties. Nickel and manganese in steel add to its tensile strength and make the austenite form of the iron-carbon solution more stable, chromium increases hardness and melting temperature, and vanadium also increases hardness while making it less prone to metal fatigue . To inhibit corrosion, at least 11% chromium can be added to steel so that a hard oxide forms on the metal surface; this

8694-496: The evolved bicycle, with tension spokes and a large front wheel. Two English manufacturers, Bayless Thomas and Rudge, displayed their high-wheel bikes (called "ordinary bikes" or "penny farthings") at the exposition. The bicycle displays inspired Albert Augustus Pope to begin making high-wheel bikes in the United States. He started the Columbia Bike Company and published a journal called " LAW Bulletin and Good Roads", which

8820-656: The exposition and asked the Philadelphia City Council for use of Fairmount Park . With reference to the numerous events of national importance that were held in the past and related to the city of Philadelphia, the City Council resolved in January 1870 to hold the Centennial Exposition in the city in 1876. The Philadelphia City Council and the Pennsylvania General Assembly created a committee to study

8946-627: The exposition and located west of the Main Exhibition Building. With a superstructure made of wood and glass resting on a foundation of massive masonry, it had a main hall painted light blue, 1,402 ft (427 m) long and 360 ft (110 m) wide, with a wing of 208 ft (63 m) by 210 ft (64 m) attached on the south side of the building. The length of the building was 18 times its height. With eight entrances, it occupied 558,440 sq ft (51,881 m ), had 1,900 exhibitors, and took six months to construct. The exhibits focused on machines and evolving industries. Machinery Hall

9072-419: The exposition introduced the general public to the notion of landscape design, as exemplified the building itself and the grounds surrounding it. A long, sunken parterre leading to Horticultural Hall became the exposition's iconic floral feature, reproduced on countless postcards and other memorabilia. This sunken garden enabled visitors on the raised walkways to see the patterns and shapes of the flowerbeds. After

9198-600: The exposition mainly consisted of two types of building, traditional masonry monuments and buildings with a structural framework of iron and steel. The Centennial Commission turned to third-place winner's architect Henry Pettit and engineer Joseph M. Wilson for design and construction of the Main Exhibition Building. A temporary structure, the Main Building was the largest building in the world by area, enclosing 21.5 acres (87,000 m ). It measured 464 ft (141 m) in width and 1,880 ft (570 m) in length. It

9324-458: The exposition the next day. The average daily attendance for May was 36,000 and for June 39,000. A severe heat wave began in mid-June and continued into July, hurting attendance. The average temperature was 81 °F (27 °C), and on ten days during the heat wave the temperature reached 100 °F (38 °C). The average daily attendance for July was 35,000, but it rose in August to 42,000 despite

9450-411: The exposition was the International Exhibition of Arts, Manufactures, and Products of the Soil and Mine, but the official theme was the celebration of the United States centennial. This was reinforced by promotional tie-ins, such as the publication of Kate Harrington 's Centennial, and Other Poems , which celebrated the exposition and the centennial. At the same time, the exposition was designed to show

9576-748: The exposition, Memorial Hall reopened in 1877 as the Pennsylvania Museum of Art and included the Pennsylvania Museum School of Industrial Art. In 1928 the museum moved to Fairmount at the head of the Benjamin Franklin Parkway, and in 1938 was renamed the Philadelphia Museum of Art . Memorial Hall continued to house the school, and afterward was taken over by the Fairmount Park Commission in 1958. The museum school

9702-471: The exposition, which was dedicated on July 4, 1873, by Secretary of the Navy George M. Robeson . The Commission decided to classify the exhibits into seven departments: agriculture, art, education and science, horticulture, machinery, manufactures, and mining and metallurgy. Newspaper publisher John W. Forney agreed to head and pay for a Philadelphia commission sent to Europe to invite nations to exhibit at

9828-437: The exposition. Despite fears of a European boycott and high American tariffs making foreign goods not worthwhile, no European country declined the invitation. To accommodate out-of-town visitors, temporary hotels were constructed near the exposition's grounds. A Centennial Lodging-House Agency made a list of rooms in hotels, boarding houses , and private homes and then sold tickets for the available rooms in cities promoting

9954-418: The exposition. In 1869, Schwarzmann began working for the Fairmount Park Commission, which administered the site of the 1876 Centennial Exposition. It is one of the great urban parks of the United States; its importance in landscape history was surpassed only by Central Park . Schwarzmann was the chief architect for the Centennial Exposition, designing Memorial Hall, Horticultural Hall, other small buildings, and

10080-429: The fairgrounds, and exorbitant rates were charged by carriage drivers. Drawing lessons from this failure, the Philadelphia exposition was ready for its visitors, with direct railroad connections to service passenger trains every 30 minutes, trolley lines, street cars, carriage routes, and even docking facilities on the river. More than 200 buildings were constructed within the exposition's grounds, which were surrounded by

10206-413: The final steel (either as solute elements, or as precipitated phases), impedes the movement of the dislocations that make pure iron ductile, and thus controls and enhances its qualities. These qualities include the hardness , quenching behaviour , need for annealing , tempering behaviour , yield strength , and tensile strength of the resulting steel. The increase in steel's strength compared to pure iron

10332-625: The finest steel in the world exported to the Roman, Egyptian, Chinese and Arab worlds at that time – what they called Seric Iron . A 200 BC Tamil trade guild in Tissamaharama , in the South East of Sri Lanka, brought with them some of the oldest iron and steel artifacts and production processes to the island from the classical period . The Chinese and locals in Anuradhapura , Sri Lanka had also adopted

10458-445: The flagship Nicetown plant was, in the management's own words, "never a 'tonnage' plant". That is, unlike larger steelmakers, they did not measure their success in terms of the sheer tonnage they could manage to produce per year. Midvale's niche in the steel industry was defined early on by a scientific approach to metallurgy during the transitional era when steelmaking gradually transformed from black art to applied science . Even after

10584-503: The form of charcoal) in a crucible, was produced in Merv by the 9th to 10th century AD. In the 11th century, there is evidence of the production of steel in Song China using two techniques: a "berganesque" method that produced inferior, inhomogeneous steel, and a precursor to the modern Bessemer process that used partial decarburization via repeated forging under a cold blast . Since

10710-454: The funds for the pavilion. Much of the pavilion was devoted to human ecology and home economics . On exhibit were over 80 patented inventions, including a reliance stove, a hand attachment for sewing machines, a dishwasher, a fountain griddle-greaser, a heating iron with removable handle , a frame for stretching and drying lace curtains, and a stocking and glove darner. The Centennial women not only showed domestic production but also employed

10836-599: The hardenability of thick sections. High strength low alloy steel has small additions (usually < 2% by weight) of other elements, typically 1.5% manganese, to provide additional strength for a modest price increase. Recent corporate average fuel economy (CAFE) regulations have given rise to a new variety of steel known as Advanced High Strength Steel (AHSS). This material is both strong and ductile so that vehicle structures can maintain their current safety levels while using less material. There are several commercially available grades of AHSS, such as dual-phase steel , which

10962-470: The idea of steelmaking as an obscure art of secret recipes did not serve him well when his recipes did not turn out right and he was unable to analyze why. With Butcher gone, Sellers renamed his erstwhile-namesake steel works the Midvale Steel Works. Kanigel states that the name reflected the fact that Midvale was roughly equidistant from the Schuylkill and Delaware rivers; however, if accurate, this etymology

11088-540: The landscaping around them. His work for the Centennial Exposition was informed by the Vienna International Exposition in 1873 , which Schwarzmann visited to study the buildings and the grounds layout. The Vienna International Exposition in 1873 was marred by disastrous logistic planning and was taken as a cautionary example. At the Vienna Exposition, there was no convenient way for visitors to reach

11214-414: The longest 125 ft (38 m) in length. The construction included red and black brick-laid design with stained glass or painted glass decorations. The Interior walls were whitewashed, and woodwork was decorated with shades of green, crimson, blue, and gold. The flooring of the building was made of wooden planks that rested directly on the ground without any air space underneath them. The orientation of

11340-439: The main production route. At the end of 2008, the steel industry faced a sharp downturn that led to many cut-backs. In 2021, it was estimated that around 7% of the global greenhouse gas emissions resulted from the steel industry. Reduction of these emissions are expected to come from a shift in the main production route using cokes, more recycling of steel and the application of carbon capture and storage technology. Steel

11466-450: The most part, however, p-block elements such as sulphur, nitrogen , phosphorus , and lead are considered contaminants that make steel more brittle and are therefore removed from steel during the melting processing. The density of steel varies based on the alloying constituents but usually ranges between 7,750 and 8,050 kg/m (484 and 503 lb/cu ft), or 7.75 and 8.05 g/cm (4.48 and 4.65 oz/cu in). Even in

11592-444: The most unusual of which were front hair pieces and false teeth. Guards were required to live onsite and were housed at six police stations strategically located throughout the Exposition. A magistrate's office and courtroom were located at the only two-story police station located on the grounds and was used to conduct prisoner hearings. Officers slept in cramped quarters, which fostered health issues. Eight guards died while working

11718-579: The occasion written by Dudley Buck and Sidney Lanier was performed. The opening ceremony concluded in Machinery Hall, with Grant and Pedro II turning on the Corliss Steam Engine which powered most of the other machines at the exposition. The official number of first day attendees was 186,272 people, with 110,000 entering with free passes. In the days following the opening ceremony, attendance dropped dramatically, with only 12,720 people visiting

11844-436: The oxidation rate of iron increases rapidly beyond 800 °C (1,470 °F), it is important that smelting take place in a low-oxygen environment. Smelting, using carbon to reduce iron oxides, results in an alloy ( pig iron ) that retains too much carbon to be called steel. The excess carbon and other impurities are removed in a subsequent step. Other materials are often added to the iron/carbon mixture to produce steel with

11970-620: The pavilion's exhibits, indicating the growth of a sector of elite women during the Porfirio Díaz regime of the late nineteenth century, with many individual women sending examples of woven textiles and embroidery. Eleven nations had their own exhibition buildings, and others contributed small structures, including the Swedish School house referenced below, now in Central Park , New York City. The British buildings were extensive and exhibited

12096-449: The product but only locally relieves strains and stresses locked up within the material. Annealing goes through three phases: recovery , recrystallization , and grain growth . The temperature required to anneal a particular steel depends on the type of annealing to be achieved and the alloying constituents. Quenching involves heating the steel to create the austenite phase then quenching it in water or oil . This rapid cooling results in

12222-741: The production methods of creating wootz steel from the Chera Dynasty Tamils of South India by the 5th century AD. In Sri Lanka, this early steel-making method employed a unique wind furnace, driven by the monsoon winds, capable of producing high-carbon steel. Since the technology was acquired from the Tamilians from South India, the origin of steel technology in India can be conservatively estimated at 400–500 BC. The manufacture of wootz steel and Damascus steel , famous for its durability and ability to hold an edge, may have been taken by

12348-553: The project and seek support of the U.S. Congress . Congressman William D. Kelley spoke for the city and state, and Daniel Johnson Morrell introduced a bill to create a United States Centennial Commission. The bill, which passed on March 3, 1871, provided that the U.S. government would not be liable for any expenses. The United States Centennial Commission organized on March 3, 1872, with Joseph R. Hawley of Connecticut as president. The Centennial Commission's commissioners included one representative from each state and territory in

12474-469: The rest of the industry caught up in terms of that transition, Midvale continued for decades to maintain a niche for itself in the area of the market defined by high quality, research and development , and special applications. The company began in 1867 as the William Butcher Steel Works. The products that founders William Butcher, Jr. (a son of the founder of W. & S. Butcher Steel Works,

12600-471: The solid-state, by heating the ore in a charcoal fire and then welding the clumps together with a hammer and in the process squeezing out the impurities. With care, the carbon content could be controlled by moving it around in the fire. Unlike copper and tin, liquid or solid iron dissolves carbon quite readily. All of these temperatures could be reached with ancient methods used since the Bronze Age . Since

12726-548: The south entrance of the building served as a primary entrance to the building for streetcars. The north side related the building to the Art Gallery and the west side served as a passageway to the Machinery and Agricultural Halls. In the Main Exhibition Building, columns were placed at a uniform distance of 24 ft (7.3 m). The entire structure consisted of 672 columns, the shortest column 23 ft (7.0 m) in length and

12852-401: The steel. At the very high cooling rates produced by quenching, the carbon has no time to migrate but is locked within the face-centred austenite and forms martensite . Martensite is a highly strained and stressed, supersaturated form of carbon and iron and is exceedingly hard but brittle. Depending on the carbon content, the martensitic phase takes different forms. Below 0.2% carbon, it takes on

12978-556: The steel. The early modern crucible steel industry resulted from the invention of Benjamin Huntsman in the 1740s. Blister steel (made as above) was melted in a crucible or in a furnace, and cast (usually) into ingots. The modern era in steelmaking began with the introduction of Henry Bessemer 's process in 1855, the raw material for which was pig iron. His method let him produce steel in large quantities cheaply, thus mild steel came to be used for most purposes for which wrought iron

13104-583: The steelmaking formulas and processes, along the way analyzing and salvaging the scrap that had accumulated during Butcher's tenure. Brinley hired Russell Davenport, a fellow Yale chemist, to be his assistant. Brinley, Davenport, and Sellers led Midvale to a period of prosperity. By the Centennial Exposition in 1876, they "were making Midvale into a company as congenial to a scientific approach to industrial problems as could be found anywhere in America". It

13230-555: The technology of that time, such qualities were produced by chance rather than by design. Natural wind was used where the soil containing iron was heated by the use of wood. The ancient Sinhalese managed to extract a ton of steel for every 2 tons of soil, a remarkable feat at the time. One such furnace was found in Samanalawewa and archaeologists were able to produce steel as the ancients did. Crucible steel , formed by slowly heating and cooling pure iron and carbon (typically in

13356-532: The time was just a few rail-served miles away in the Spring Garden neighborhood ), was another benefit of the site. Midvale began with the crucible process , but two years after its founding began using the open-hearth process , which would in time replace the crucibles. The company's early years were rocky. Eventually, a principal investor, the quiet but immensely influential American engineer and businessman William Sellers , forced out Butcher, whose adherence to

13482-522: The upper carbon content of steel, beyond which is cast iron. When carbon moves out of solution with iron, it forms a very hard, but brittle material called cementite (Fe 3 C). When steels with exactly 0.8% carbon (known as a eutectoid steel), are cooled, the austenitic phase (FCC) of the mixture attempts to revert to the ferrite phase (BCC). The carbon no longer fits within the FCC austenite structure, resulting in an excess of carbon. One way for carbon to leave

13608-481: The world that had relied exclusively on having one or a few large buildings. The Centennial Commission sponsored a design competition for the principal buildings, conducted in two rounds; winners of the first round had to have details such as construction cost and time prepared for the runoff on September 20, 1873. After the ten design winners were chosen, it was determined that none of them allowed enough time for construction and limited finances. The architecture of

13734-585: The world the United States' industrial and innovative prowess. The exposition was originally scheduled to open in April, marking the anniversary of the Battles of Lexington and Concord , but construction delays caused the date to be pushed back to May 10. Bells rang all over Philadelphia to signal the exposition's opening. The opening ceremony was attended by President Ulysses Grant and his wife as well as Emperor Pedro II of Brazil and his wife . A cantata commissioned for

13860-428: The world's steel in 2023. Further refinements in the process, such as basic oxygen steelmaking (BOS), largely replaced earlier methods by further lowering the cost of production and increasing the quality of the final product. Today more than 1.6 billion tons of steel is produced annually. Modern steel is generally identified by various grades defined by assorted standards organizations . The modern steel industry

13986-420: Was 45 ft (14 m) tall, weighed 650 tons, and had 1 mi (1.6 km) of overhead line belts connecting to the machinery in the building. It symbolized the technology that was transforming the United States into an industrial powerhouse. Amenities available to the visitors within the hall were rolling chairs, telegraph offices, and dinner for fifty cents. Machinery Hall had 8,000 operating machines and

14112-499: Was also getting into the steel rail business. The Nicetown site was chosen because plenty of the anthracite coal that moved by river, canal, and rail from northeast Pennsylvania passed by Nicetown on its way to Port Richmond . Anthracite was superior to bituminous coal for steelmaking. Nicetown's proximity to one of the principal locomotive-building plants of the western hemisphere, the Baldwin Locomotive Works (which at

14238-402: Was constructed using prefabricated parts, with a wood and iron frame resting on a substructure of 672 stone piers. Wrought iron roof trusses were supported by the columns of the superstructure. The building took eighteen months to complete and cost $ 1,580,000. The building was surrounded by portals on all four sides. The east entrance of the building was used as an access way for carriages, and

14364-500: Was designed to look like various barn structures pieced together. The building's exhibits included products and machines used in agriculture and other related businesses. Situated high atop a hill presiding over Fountain Avenue, Horticultural Hall epitomized floral achievement, which attracted professional and amateur gardeners. Unlike the other main buildings, it was meant to be permanent. Horticultural Hall had an iron and glass frame on

14490-697: Was developed in Southern India and Sri Lanka in the 1st millennium BCE. Metal production sites in Sri Lanka employed wind furnaces driven by the monsoon winds, capable of producing high-carbon steel. Large-scale wootz steel production in India using crucibles occurred by the sixth century BC, the pioneering precursor to modern steel production and metallurgy. High-carbon steel was produced in Britain at Broxmouth Hillfort from 490–375 BC, and ultrahigh-carbon steel

14616-497: Was fanciful, because a look at a map of Philadelphia shows that the plant, at Wissahickon and Roberts Avenues, was actually much closer to the Schuylkill. Perhaps the emphasis was that it was not directly on either river (as might usually be expected of a steelworks), but between them. In 1872, Sellers brought in a Yale-trained chemist with a talent for organization named Charles Augustus Brinley, who used applied science to straighten out

14742-405: Was filled with a wide assortment of hand tools, machine tools, material handling equipment, and the latest fastener technology. Some of the sandstone that was used to build the hall was from Curwensville, Pennsylvania . The Art Gallery building (now known as Memorial Hall ) is the only large exhibit building still standing on the exposition site. Constructed of brick, glass, iron, and granite in

14868-502: Was formerly used. The Gilchrist-Thomas process (or basic Bessemer process ) was an improvement to the Bessemer process, made by lining the converter with a basic material to remove phosphorus. Another 19th-century steelmaking process was the Siemens-Martin process , which complemented the Bessemer process. It consisted of co-melting bar iron (or steel scrap) with pig iron. These methods of steel production were rendered obsolete by

14994-663: Was in the 1880s that Frederick Winslow Taylor rose through the ranks at Midvale, from lathe operator , to gang boss, to engineer, to chief engineer of the works. During this time he developed the core of his philosophy of scientific management , which later became enormously influential (and often controversial) throughout the field of industrial engineering . Other notable people who worked for Midvale Steel or in close cooperation with it include Henry Gantt , James Buchanan Eads , Theodore Cooper , and Francis B. Foley . Charles E. Brinley, president of Baldwin Locomotive Works during

15120-417: Was opened that April on the southeast corner of Market Street and 32nd Street. A branch office operated during the exposition on the fairgrounds. The Centennial Commission ran out of funds for printing and other expenses. Philadelphia city officials appropriated $ 50,000 to make up for the shortfall. Herman J. Schwarzmann , an engineer for the Fairmount Park Commission, was appointed the main designer of

15246-438: Was produced globally, with 630,000,000 tonnes (620,000,000 long tons; 690,000,000 short tons) recycled. Modern steels are made with varying combinations of alloy metals to fulfil many purposes. Carbon steel , composed simply of iron and carbon, accounts for 90% of steel production. Low alloy steel is alloyed with other elements, usually molybdenum , manganese, chromium, or nickel, in amounts of up to 10% by weight to improve

15372-729: Was produced in the Netherlands from the 2nd-4th centuries AD. The Roman author Horace identifies steel weapons such as the falcata in the Iberian Peninsula , while Noric steel was used by the Roman military . The Chinese of the Warring States period (403–221 BC) had quench-hardened steel, while Chinese of the Han dynasty (202 BC—AD 220) created steel by melting together wrought iron with cast iron, thus producing

15498-679: Was the beginning of the Good Roads Movement . . The main British building, also known as St. George's Hall or the English Commission Building, survived at its original site as Fairmount Park offices until it was demolished in 1961. 26 of the 37 U.S. states constructed buildings along States Drive in the exhibition grounds. Only three such state houses are still extant: the Ohio House at its original location in Fairmount Park,

15624-654: Was the first official world's fair to be held in the United States and coincided with the centennial anniversary of the Declaration of Independence 's adoption in Philadelphia on July 4, 1776. It was held in Fairmount Park along the Schuylkill River on fairgrounds designed by Herman J. Schwarzmann . Nearly 10 million visitors attended the exposition, and 37 countries participated in it. The Great Central Fair on Logan Square in Philadelphia , in 1864, also known as

15750-473: Was the longest nave ever introduced into an exhibition building up to that time. On both sides of the nave were avenues 100 ft (30 m) in width and 1,832 ft (558 m) in length. Aisles 48 ft (15 m) wide were located between the nave and the side avenues, and smaller aisles 24 ft (7.3 m) in width were on the outer sides of the building. The exterior of the building featured four towers, each 75 ft (23 m) high, at each of

15876-490: Was the show case for the state of the art industrial technology that was being produced at the time. The United States of America alone took up two-thirds of the exhibit space in the building. One of the major attractions on display in the building was the Corliss Centennial Steam Engine that ran power to all the machinery in the building as well as other parts of the world's fair. The 1,400 horsepower engine

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