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無縫氣瓶用鋼GB12447化學成分

牌號	化學成份（%）
	C	Si	Mn	P	S	Cr	Ni	Mo	Cu
40Mn2	0.37-0.44	0.17-0.37	1.40-1.80	≤0.035	≤0.035	≤0.30	≤0.30		≤0.20
40Mn2A	0.37-0.44	0.17-0.37	1.40-1.80	≤0.025	≤0.025	≤0.30	≤0.30		≤0.20
34Mn2V	0.30-0.37	0.17-0.37	1.40-1.80	≤0.035	≤0.035	≤0.30	≤0.30	V 0.07-0.12 Mo 0.15-0.25	≤0.20
30CrMo	0.26-0.34	0.17-0.37	0.40-0.70	≤0.035	≤0.035	0.80-1.00	≤0.30		≤0.20