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Arthur Balfour and Co.
Capital Steel Works, Sheffield

British Steel Corporation
British Steel was a large British steel producer, consisting of the assets of former private companies which had been nationalised, largely under the Labour Party government of Harold Wilson (1964-1970).

It was privatised in 1988 under the Conservative government of Margaret Thatcher. It 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.

John Brown & Co.
Atlas Steel and Spring Works.

Harry Brearley is credited with the creation of Stainless steel in the Brown-Firth Research Laboratories (a joint facility of John Brown & Co. and Thomas Firth and Sons.) in 1913.

Davy Brothers
David and Dennis Davy founded the company in 1830 in the city centre, at Lady's Bridge. In 1851 they acquired the Park Iron Works at Norfolk Bridge, which included one of the largest foundries of its day. By 1921 the business had outgrown the workshops at the Park Works, and the company moved to new premises at Darnall.

The company later became Davy United's and subseqently Davy Markham's.

Thomas Firth & Sons
A small company was founded by Mark Firth in 1842 with his brother, Thomas Jr. Their father joined them shortly afterwards, and the firm of Thomas Firth & Sons was created. In 1852 the business had expanded into larger premises at the Norfolk Works in Savile Street, Sheffield, which had the largest rolling mill in Sheffield.

The Firth's business expanded into the armaments market, installing two large steam hammers in 1863. In 1871, the company cast the thirty five ton Woolwich Infant gun. In 1875 they produced an eighty ton gun.

Firth Brown Co.
Founded in 1930, the Firth Brown company was created by merger of Thomas Firth & Sons and John Brown & Co. Both companies were already leaders in the technological development in the industry. Combined, they formed one of Sheffield's largest employers.

During the Second World War, Firth Brown produced over 60,000 tons of armour plate for ships and tanks, nearly half a million forgings, over 150,000 tons of special steels and over half a million bombs and armour piercing shells.

Hadfield's
Robert Hadfield's father, also named Robert Hadfield, owned Hadfield's Steel Foundry in Sheffield and was one of the first manufacturers of steel castings. The younger Hadfield took over the business in [[1888] and built the firm into one of the largest foundries in the world. He published over 200 papers on his metallurgical research.

William Jessop & Sons
Park Works

Samuel Osborn & Company
In 1851 Samuel Osborn Jr. set up on his own company as a file manufacturer with premises in Broad Lane which were named Clyde Works, the following year he set up a tilt hammer and forge in the Philadelphia district of the city, the new site being named Brookhill Works. In 1868 he bought new premises, in the Wicker area of the city, these taking the name Clyde Steel & Iron Works, and becoming their main base of operations. Expanding again, in 1885 he bought and expanded the Rutland Works, in the Neepsend area of the city.

Sanderson Brothers
crucible steel works

Vickers
Vickers was formed in Sheffield as a steel foundry by the miller Edward Vickers and his father-in-law George Naylor in 1828. In 1863 the company moved to a new site in Sheffield on the River Don in Brightside. The company went public in 1867 as Vickers, Sons & Company and gradually acquired more businesses, branching out into various sectors.

Walker and Hall
Walker and Hall Electric Works No. 11 Howard Street