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出典:Wiktionary
出典:『Wiktionary』 (2013/11/25 16:07 UTC 版)
steel-making (uncountable)
出典:Wikipedia
出典:『Wikipedia』 (2011/05/29 22:38 UTC 版)
Steelmaking is the second step in producing steel from iron ore. In this stage, impurities such as sulfur, phosphorus, and excess carbon are removed from the raw iron, and alloying elements such as manganese, nickel, chromium and vanadium are added to produce the exact steel required.
steelmaking