钢 has 钅 metal as the meaning part and 冈 gāng for the sound. It first named a metal stronger than pig iron and tougher than wrought iron. That meaning narrowed to 'steel'.
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Example Sentences
这个房子是用钢建造的。
zhègèfángzǐshìyònggāngjiànzàode 。
This house is built of steel.
钢是制作工具的重要材料。
gāngshìzhìzuògōngjùdezhòngyàocáiliào 。
Steel is an important material for making tools.
他在工厂里工作，负责钢的生产。
tāzàigōngchǎnglǐgōngzuò ， fùzégāngdeshēngchǎn 。
He works in a factory, responsible for the production of steel.