100-481: British Steel was a major British steel producer. It originated from the nationalised British Steel Corporation ( BSC ), formed in 1967, which was privatised as a public limited company, British Steel plc , in 1988. It was once a constituent of the FTSE 100 Index . The company merged with Koninklijke Hoogovens to form Corus Group in 1999. Alasdair M. Blair (1997), Professor of International Relations and Head of
200-650: A metropolitan and ceremonial county with a Lord Lieutenant of South Yorkshire and a High Sheriff . South Yorkshire lies within the Sheffield City Region with Barnsley also being within the Leeds City Region , reflecting its geographical position midway between Yorkshire's two largest cities. The metropolitan county borders Derbyshire , West Yorkshire , North Yorkshire , the East Riding of Yorkshire , Lincolnshire and Nottinghamshire . The terrain of
300-407: A special share which carried no voting rights but until 31 December 1993, permitted the government to stop any one party controlling more than 15% of the shares. British Steel employees were given a free allocation of shares, and offered two free shares for each they purchased up to £165, discounted shares up to £2,200, and priority on applying for shares up to £10,000. Dealing in shares opened on
400-412: 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
500-684: 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 ,
600-444: 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
700-461: A complacency with existing equipment, plants operating below full capacity (hence the low efficiency), poor-quality assets, outdated technology, government price controls, higher coal and oil costs, lack of funds for capital improvement, and increasing competition on the world market. By the 1970s, the Labour government's main goal for the declining industry was to keep employment high. Since British Steel
800-428: 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
900-445: 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
1000-412: 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
1100-637: A new county—York and North Midlands—roughly centred on the southern part of the West Riding of Yorkshire and northern parts of Derbyshire and Nottinghamshire. The review was abolished in favour of the Royal Commission on Local Government before it was able to issue a final report. The Royal Commission's 1969 report, known as the Redcliffe-Maud Report, proposed the removal of much of the then existing system of local government. The commission described
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#17328512663271200-642: A profit last year for the first time in over ten years." We will continue the successful programme of privatisation. Following Margaret Thatcher 's re-election, on 3 December 1987 the Conservative government formally announced in a statement by Kenneth Clarke , Minister of State for Trade and Industry , that it intended to privatise the British Steel Corporation. … the Government are committed to returning successful state industries such as steel to
1300-534: 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
1400-448: 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
1500-586: A transition from uplands and rural landscape to lowlands and urban landscape towards the east of the county. Major rivers which cross the area are the Dearne , Rother and Don . To the east, in the Doncaster area the landscape becomes flatter as the eastward dipping carboniferous rocks of the coalfield are overlain by the lacustrine deposits of the Humberhead Levels. South Yorkshire contains green belt throughout
1600-672: 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
1700-403: 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
1800-403: 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
1900-449: 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
2000-408: 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
2100-535: 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
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#17328512663272200-687: 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
2300-507: 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
2400-463: 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
2500-544: 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
2600-510: 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
2700-434: 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
2800-400: 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
2900-457: 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
3000-441: 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
3100-529: 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
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3200-498: 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
3300-485: Is widespread evidence of both current and former industrial activity. There are numerous mine buildings, former spoil heaps and iron and steel plants. The scenery is a mixture of built up areas, industrial land with some dereliction, and farmed open country. Ribbon developments along transport routes including canal, road and rail are prominent features of the area although some remnants of the pre industrial landscape and semi-natural vegetation still survive. The Pennines in
3400-625: The 1970 general election , there was a commitment to local government reform, and the idea of a metropolitan county of South Yorkshire. The Local Government Act 1972 reformed local government in England by creating a system of two-tier metropolitan and non-metropolitan counties and districts throughout the country. The act formally established South Yorkshire on 1 April 1974, although South Yorkshire County Council (SYCC) had been running since elections in 1973 . The leading article in The Times on
3500-556: The 1994–95 season , with a view to British Steel-sponsored Middlesbrough shirts making their appearance the following season . But the sponsorship deal was terminated before it commenced after it was revealed that British steel only made up a tiny fraction of steel used in construction of the stadium, and that the bulk of the steel had been imported from Germany . The English rock band XTC mentioned British Steel in their 1979 song Making Plans for Nigel . The heavy metal band Judas Priest named their 1980 album British Steel after
3600-647: The Dearne Valley which covers Barnsley and surrounding area; the Sheffield urban area which covers Sheffield, Rotherham and surrounding area; and the Doncaster urban area which covers Doncaster and surrounding area. The South Yorkshire County Council was abolished and its districts effectively became unitary authorities; they are the City of Sheffield , the City of Doncaster , the Metropolitan Borough of Barnsley and
3700-631: 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
3800-519: The Iron and Steel Corporation of Great Britain . American Marshall Plan aid in 1948–50 reinforced modernisation efforts and provided funding for them. However, the nationalisation was reversed by the Conservative government after 1952. The industry was re-nationalised in 1967 under another Labour government, becoming British Steel Corporation (BSC). But by then, 20 years of political manipulation had left companies, such as British Steel, with serious problems:
3900-451: The Metropolitan Borough of Rotherham . In 1986, throughout England the metropolitan county councils were abolished. The ceremonial county with a Lord Lieutenant of South Yorkshire and a High Sheriff was retained. The county remains defined as metropolitan , functions of the county council devolved to the boroughs with many functions administered by joint authorities (such a passenger transport executive ) containing representatives of
4000-472: The South Yorkshire Structure Plan of the environment, conservation and land use, South Yorkshire County Council commissioned a public attitudes survey covering job opportunities, educational facilities, leisure opportunities, health and medical services, shopping centres and transport in the county. In 1986, throughout England the metropolitan county councils were abolished. The functions of
4100-586: 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
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4200-592: 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
4300-445: 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
4400-470: 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
4500-600: 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
4600-463: The British Steel Corporation. Lead singer Rob Halford explained in an interview that the 'sounds of heavy metal' have been with him since childhood, due to the close proximity of the BSC plant where he grew up. 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
4700-561: The Department of Politics and Public Policy at De Montfort University, has explored the history of British Steel since the Second World War to evaluate the impact of government intervention in a market economy. He suggests that entrepreneurship was lacking in the 1940s; the government could not persuade the industry to upgrade its plants. For generations, the industry had followed a piecemeal growth pattern that proved relatively inefficient in
4800-497: The Labour government of James Callaghan , a review by Lord Beswick had led to the reprieve of the so-called 'Beswick plants', for social reasons, but subsequent governments were obliged under EU rules to withdraw subsidies. Major changes resulted across Europe, including in the UK: The Conservative manifesto for the 1987 general election noted that "British Steel has more than doubled its productivity since 1979 and made
4900-463: 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
5000-719: The London Stock Exchange on 5 December 1988. The privatised company later merged with the Dutch steel producer Koninklijke Hoogovens to form Corus Group on 6 October 1999. Corus itself was taken over in March 2007 by the Indian steel operator Tata Steel . Ian MacGregor later became famous for his role as Chairman of the National Coal Board during the UK miners' strike (1984–1985) . During
5100-518: The UK's steelmaking capacity; it had around 268,500 employees and around 200 wholly or partly-owned subsidiaries based in the United Kingdom, Australia, New Zealand, Canada, Africa, South Asia, and South America. Dorman Long, South Durham and Stewarts and Lloyds had merged as British Steel and Tube Ltd before vesting took place. BSC later arranged an exchange deal with Guest, Keen and Nettlefolds Ltd (GKN),
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#17328512663275200-514: 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. South Yorkshire South Yorkshire is a ceremonial county in the Yorkshire and the Humber region of England . It borders North Yorkshire and West Yorkshire to the north, the East Riding of Yorkshire to the north-east, Lincolnshire to
5300-436: 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
5400-471: 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
5500-494: 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
5600-521: 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
5700-523: The coast for ease of access by sea, and closing older, smaller plants, especially those that had been located inland for proximity to coal supplies. From the mid-1970s, British Steel pursued a strategy of concentrating steelmaking in five areas: South Wales, South Yorkshire , Scunthorpe , Teesside and Scotland . This policy continued following the Conservative victory at the 1979 general election . Other traditional steelmaking areas faced cutbacks. Under
5800-518: The company and its work force to be best placed to go on to further achievements and to secure a firmly based competitive industry with a long-term future. On 5 September 1988 the assets, rights and liabilities of British Steel Corporation were transferred to British Steel plc, registered under the Companies Act as company number 2280000, by the British Steel Act 1988. The government retained
5900-630: The country. As one of the least prosperous areas in Western Europe, South Yorkshire has been targeted for funding from the European Regional Development Fund . This is a chart of trend of regional gross value added of South Yorkshire at current basic prices with figures in millions of British Pounds Sterling. However, the county has experienced a recent growth in the services sector. In the FDI European Cities and Regions of
6000-586: The county are more rural. The county is governed by four metropolitan boroughs : Barnsley , City of Doncaster , Rotherham , and City of Sheffield . They collaborate through South Yorkshire Mayoral Combined Authority . South Yorkshire lies on the edge of the Pennines , and the west of the county contains part of the Peak District National Park . The River Don rises in these hills, and flows through Sheffield, Rotherham, and Doncaster before reaching
6100-500: The county council were devolved to the boroughs; joint-boards covering fire, police and public transport; and to other special joint arrangements. The joint boards continue to function and include the South Yorkshire Passenger Transport Executive . The South Yorkshire Police and Crime Commissioner also oversees South Yorkshire Police . Although the county council was abolished, South Yorkshire remains
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#17328512663276200-515: The county is mostly distinguished by the Pennines and its foothills which rise in the west of the county and gradually descend into the Humberhead Levels in the east of the county. Geologically, the county lies largely on the carboniferous rocks of the Yorkshire coalfield in the outer Pennine fringes, producing a rolling landscape with hills, escarpments and broad valleys. In this landscape, there
6300-538: The county, surrounding its four districts to large extents. It was first drawn up from the 1950s. The western edge of the Sheffield and Barnsley districts directly form with the boundary of the Peak District National Park. The table below outlines many of the county's settlements, and is formatted according to their metropolitan borough. Of these settlements above, South Yorkshire has three main urban areas:
6400-526: The day the Local Government Act came into effect noted that the "new arrangement is a compromise which seeks to reconcile familiar geography which commands a certain amount of affection and loyalty, with the scale of operations on which modern planning methods can work effectively". South Yorkshire initially had a two tier structure of local government with a strategic-level county council and four districts providing most services. In 1974, as part of
6500-422: 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
6600-410: The east, Nottinghamshire to the south-east, and Derbyshire to the south and west. The largest settlement is the city of Sheffield . The county is largely urban, with an area of 1,552 km (599 sq mi) and a population of 1,402,918. The largest settlements after Sheffield (556,500) are the city of Doncaster (113,566), Rotherham (109,697), and Barnsley (96,888). The east and west of
6700-403: The face of world competition. The Labour Party came to power at the 1945 general election , pledging to bring several industries into state ownership . In 1946, it put the first steel development plan into practice with the aim of increasing capacity. It passed the Iron and Steel Act 1949 , which meant nationalisation of the industry, as the government bought out the shareholders, and created
6800-413: 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
6900-625: 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
7000-412: The flat Humberhead Levels in the east of the county. While the county of South Yorkshire was created in 1974, the history of its constituent settlements and parts goes back centuries. Prehistoric remains include a Mesolithic "house" (a circle of stones in the shape of a hut-base) dating to around 8000 BC, found at Deepcar , in the northern part of Sheffield. Evidence of even earlier inhabitation in
7100-459: The following Conservative governments of the 1950s with only Britain's largest steel company, Richard Thomas and Baldwins , remaining in public ownership. BSC was established under the Iron and Steel Act 1967 , which vested in the Corporation the shares of the fourteen major UK-based steel companies then in operation, being: At the time of its formation, BSC comprised around ninety per cent of
7200-503: 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
7300-478: The four councils. The South Yorkshire Mayoral Combined Authority was established in 2014 to bring the leaders of the four councils to give the county a main statutory body. It is led by the directly elected Mayor of South Yorkshire . In the 2016 referendum on the United Kingdom's membership of the European Union , South Yorkshire voted 62% leave and 38% remain, making it one of the most heavily Leave areas in
7400-599: 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
7500-439: 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
7600-450: 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
7700-436: 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
7800-507: The parent company of GKN Steel, under which BSC acquired Dowlais Ironworks at Merthyr Tydfil and GKN took over BSC's Brymbo Steelworks near Wrexham . According to Blair (1997), British Steel faced serious problems at the time of its formation, including obsolescent plants; plants operating under capacity and thus at low efficiency; outdated technology; price controls that reduced marketing flexibility; soaring coal and oil costs; lack of capital investment funds; and increasing competition on
7900-440: The private sector as soon as practicable. It is quite apparent that the British Steel Corporation has now reached the stage where it would benefit from a return to a fully commercial environment. I am therefore pleased to announce that I am setting in hand the work necessary to privatise the corporation as soon as possible, subject to market conditions. […] I believe that early privatisation and full commercial freedom will enable
8000-449: 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
8100-741: 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
8200-471: 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
8300-401: 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
8400-556: 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
8500-516: The strike the " Battle of Orgreave " took place at British Steel's coking plant. In 1971 British Steel sponsored Sir Chay Blyth in his record-making non-stop circumnavigation against the winds and currents, known as 'The Impossible Voyage'. In 1992 they sponsored the British Steel Challenge , the first of a series of 'wrong way' races for amateur crews. British Steel had agreed a sponsorship deal with Middlesbrough Football Club during
8600-451: The system of administering urban and rural districts separately as outdated, noting that urban areas provided employment and services for rural dwellers, and open countryside was used by town dwellers for recreation. Redcliffe-Maud's recommendations were accepted by the Labour government in February 1970. Although the Redcliffe-Maud Report was rejected by the Conservative government after
8700-555: 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
8800-522: 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
8900-644: The west of the county are mostly inside the Peak District National Park and also contain carboniferous rocks, with the underlying geology primarily being millstone grit sandstones of the Dark Peak rising from the Yorkshire coalfield and the terrain is mostly moorland plateaus and gritstone edges. The inner Pennine fringes between the Dark Peak and Yorkshire coalfield are distinguished by many steep valleys, and
9000-578: The wider region exists about 3 miles (5 km) over the county boundary at Creswell Crags in Derbyshire , where artefacts and rock art found in caves have been dated by archaeologists to the late Upper Palaeolithic period, at least 12,800 years ago. The region was on the frontier of the Roman Empire during the Roman period. The main settlements of South Yorkshire grew up around the industries of mining and steel manufacturing. The main mining industry
9100-408: The world market. By the 1970s, the government adopted a policy of keeping employment high in the declining industry. This especially impacted BSC since it was a major employer in a number of depressed regions. One of the arguments made in favour of nationalisation was that it would enable steel production to be rationalised. This involved concentrating investment on major integrated plants, placed near
9200-428: 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
9300-406: Was a major employer in depressed regions, it was decided to keep many mills and facilities operating at a loss. In the 1980s, Conservative Prime Minister Margaret Thatcher re-privatised BSC as British Steel. Under private control, the company dramatically cut its workforce and underwent a radical reorganisation and massive capital investment to again become competitive in the world marketplace. BSC
9400-408: Was coal which was concentrated to the north and east of the county. There were also iron deposits which were mined in the area. The rivers running off the Pennines to the west of the county supported the steel industry that is concentrated in Sheffield, Stocksbridge and Rotherham. The proximity of the iron and coal also made this an ideal place for steel manufacture. Although Christian nonconformism
9500-697: 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
9600-400: Was formed from the assets of former private companies which had been nationalised, largely under the Labour government of Harold Wilson , on 28 July 1967. Wilson's was the second attempt at nationalisation; the post-war government of Clement Attlee had created the Iron and Steel Corporation of Great Britain in 1951 taking public ownership of 80 companies but this had been largely reversed by
9700-502: 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
9800-597: Was never as strong in South Yorkshire as in the mill towns of West Yorkshire, there are still many Methodist and Baptist churches in the area. Also, South Yorkshire has a relatively high number of followers of spiritualism . It is the only county that counts as a full region in the Spiritualists' National Union . The Local Government Commission for England presented draft recommendations, in December 1965, proposing
9900-438: 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
10000-729: 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
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