牌号	化学成分a，％
牌号	C	Si	Mn	P	S	Alt
SAPH310	≤0.10	≤0.30	≤0.50	≤0.035	≤0.035	≥0.010
SAPH370	≤0.21	≤0.30	≤0.75	≤0.035	≤0.035
SAPH400	≤0.21	≤0.30	≤1.40	≤0.030	≤0.025
SAPH440	≤0.21	≤0.30	≤1.50	≤0.030	≤0.025
SPFH540	≤0.15	≤0.50	≤1.80	≤0.025	≤0.025
SPFH590	≤0.18	≤0.60	≤2.00	≤0.025	≤0.025
B440QK	≤0.21	≤0.35	≤1.80	≤0.030	≤0.025
B330CL	≤0.10	≤0.30	≤0.50	≤0.030	≤0.025
B380CL	≤0.12	≤0.30	≤1.20
B420CL	≤0.12	≤0.30	≤1.50
B320L	≤0.10	≤0.30	≤0.50	≤0.030	≤0.035
B420L	≤0.12	≤0.50	≤1.50		≤0.025
B510L	≤0.16	≤0.50	≤1.60		≤0.025
B510DL	≤0.18	≤0.30	≤1.60	≤0.025	≤0.020
B550L	≤0.16	≤0.50	≤1.60	≤0.030	≤0.025
B440QZR	≤0.12	≤0.50	≤1.30	≤0.030	≤0.025	－
B480QZR	≤0.16	≤0.50	≤1.50	≤0.030	≤0.035	－
a为改善钢的性能，根据需要可添加其他合金元素，此时Alt的下限不要求。