低碳钢的含碳量应为下列哪项?( )A.小于0.25% B.0.25%~0.6

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问题 低碳钢的含碳量应为下列哪项?(  )A.小于0.25%B.0.25%~0.6%C.0.6%~1%D.1%~2%

选项 A.小于0.25%
B.0.25%~0.6%
C.0.6%~1%
D.1%~2%

答案 A

解析 低碳钢的含碳量为0.06%~0.25%,含锰量为0.25%~1%,含磷量不超过0.04%,舍硫量不超过0.05%。中碳钢的含碳量为0.25%~0.55%,含锰量为0.30%~1.00%,含磷量不超过0.04%,含硫量不超过0.05%。高碳钢的含碳量为0.60%~1.03%,含锰量为0.30%~0.90%,含磷量不超过0.04%,含硫量不超过0.05%。
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