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Iron is often the primary component in steel, but a number of other aspects can be existing or extra. Stainless steels, which happen to be immune to corrosion and oxidation, commonly have to have yet another 11% chromium.儘管在文藝復興之前很久,人們已經懂得使用各種低效的方法來生產鋼,但是鋼的普及化要等到十