Englishmen, Sir Henry Bessemer (1813-1898) invented the first process for mass-producing steel inexpensively, essential to the development of skyscrapers. An American, William Kelly, had held a patent for "a system of air blowing the carbon out of pig iron" a method of steel production known as the pneumatic process of steelmaking. Air is blown through molten pig iron to oxidize and remove unwanted impurities.
Bankruptcy forced Kelly to sell his patent to Bessemer, who had been working on a similar process for making steel. Bessemer patented "a decarbonization process, utilizing a blast of air" in 1855.
Modern steel is made using technology based on Bessemer's process. Bessemer was knighted in 1879 for his contribution to science. The "Bessemer Process" for mass-producing steel, was named after Bessemer.
The inventor, Sir Henry Bessemer on the making of the first steel ingot:
I well remember how anxiously I awaited the blowing of the first 7-cwt. charge of pig iron. I had engaged an ironfounder's furnace attendant to manage the cupola and the melting of the charge. When his metal was nearly all melted, he came to me, and said hurriedly: "Where be going to put the metal, maister?" I said: "I want you to run it by a gutter into that little furnace," pointing to the converter, "from which you have just raked out all the fuel, and then I shall blow cold air through it to make it hot." The man looked at me in a way in which surprise and pity for my ignorance seemed curiously blended, as he said: "It will soon be all of a lump." Notwithstanding this prediction, the metal was run in, and I awaited with much impatience the result. The first element attacked by the atmospheric oxygen is the silicon, generally present in pig iron to the extent of 1 1/2 to 2 per cent.; it is the white metallic substance of which flint is the acid silicate. Its combustion furnishes a great deal of heat; but it is very undemonstrative, a few sparks and hot gases only indicating the fact that something is going quietly on. But after an interval of ten or twelve minutes, when the carbon contained in grey pig iron to the extent of about 3 per cent. is seized on by the oxygen, a voluminous white flame is produced, which rushes out of the openings provided for its escape from the upper chamber, and brilliantly illuminates the whole space around. This chamber proved a perfect cure for the rush of slags and metal from the upper central opening of the first converter. I watched with some anxiety for the expected cessation of the flame as the carbon gradually burnt out. It took place almost suddenly, and thus indicated the entire decarburisation of the metal. The furnace was then tapped, when out rushed a limpid stream of incandescent malleable iron, almost too brilliant for the eye to rest upon; it was allowed to flow vertically into the parallel undivided ingot mould. Then came the question, would the ingot shrink enough, and the cold iron mould expand enough, to allow the ingot to be pushed out? An interval of eight or ten minutes was allowed, and then, on the application of hydraulic force to the ram, the ingot rose entirely out of the mould, and stood there ready for removal.Henry Bessemer
English inventor and engineer, who invented the first process for mass-producing steel inexpensively.
Henry Bessemer, Man of Steel
Short biography on Henry Bessemer's invention of steel production.
Sir Henry Bessemer, F.R.S.
Full length online autobiography written by Bessemer - full of illustrations of steel production.
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