低碳钢(AISI1005~1026)的含碳量为0.06%~0.28%,含锰量为0.25%~1%,含磷量不超过0.04%,含硫量不超过0.05%。中碳钢(AISI1029~1053)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(AISI1055~1095)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%。