Harry Brearley
Harry Brearley (18 February 1871 – 14 July 1948) was an English metallurgist, usually credited with the invention of "rustless steel" (later to be called "stainless steel" in the anglophone world).
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.