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| hypoeutectoid steel (【技】含碳量低于0. 77%的非合金钢。显微组织由铁素体和珠光体组成。先共析铁素体含量随钢中碳含量增加而减少，而珠光体含量则随钢中含碳量增加而增加。当钢的含碳量为0.40%时，铁素体和珠光体的含量大约各占0. 50%。冷却速度对先共析铁素体的形成也有一定的影响。亚共析钢多属于结构钢范畴，可不经热处理直接使用，亦可经过热处理后使用。); hyposteel | |||
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亚 共 析钢 : 2 phrases in 1 subject |
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