Yorkshire and the Humber
Stainless steel was invented in 1913 by Harry Brearley of Sheffield, working for Firth Brown Steels (now called Sheffield Forgemasters). SAE 304 stainless steel is the most common stainless steel today, invented by Dr William Herbert Hatfield FRS in 1924 at Firth-Vickers known as Staybrite 18/8, a chromium-nickel steel. Many Swiss watches were mostly made out of Staybrite.
History of the steel industry (1850–1970)
Carnegie's great innovation was in the cheap and efficient mass production of steel rails for railroad lines. This could not have happened without the prior invention of Bessemer Steel. Thus Carnegie's "innovation" was scale, not anything technical.
In the late 1880s, The Carnegie Steel was the largest manufacturer of pig iron, steel rails, and coke in the world, with a capacity to produce approximately 2,000 tons of pig iron per day. In 1888, he bought the rival Homestead Steel Works, which included an extensive plant served by tributary coal and iron fields, a 425-mile (685 km) long railway, and a line of lake steamships. A consolidation of Carnegie's assets and those of his associates occurred in 1892 with the launching of the Carnegie Steel Company.