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原始問(wèn)題:鋼鐵是怎樣做成的,?原則上來(lái)說(shuō)都是鑄造而成嗎,? |
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點(diǎn)評(píng)
這種鑄鐵已經(jīng)不是煉鐵-煉鋼-軋鋼這種生產(chǎn)流程了,,鑄鐵是用生鐵和廢鋼作為原料的
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