钢级 Standard	牌号 Steel Grade	化学成分 Chemical Composition(%)
		C	Si	Mn	P	S
JIS G3445	STKM11A	≤0.12	≤0.35	≤0.60	≤0.040	≤0.040
	STKM12A	≤0.20	≤0.35	≤0.60	≤0.040	≤0.040
	STKM12B
	STKM12C
	STKM13A	≤0.25	≤0.35	0.30-0.90	≤0.040	≤0.040
	STKM13B
	STKM13C
	STKM14A	≤0.30	≤0.35	0.30-1.00	≤0.040	≤0.040
	STKM14B
	STKM14C

标准 Standard	牌号 Steel Grade	机械性能 Mechanical properties
标准 Standard	牌号 Steel Grade	抗拉强度（Mpa）Tensile Strength	屈服强度(Mpa)Yield Strength	伸长率（%）Elongation
JIS G3445	STKM11A	≥295	\	≥35
	STKM12A	≥345	≥175	≥35
	STKM12B	≥390	≥275	≥25
	STKM12C	≥470	≥355	≥20
	STKM13A	≥375	≥215	≥30
	STKM13B	≥440	≥305	≥20
	STKM13C	≥510	≥380	≥15
	STKM14A	≥410	≥245	≥25
	STKM14B	≥500	≥355	≥15
	STKM14C	≥550	≥410	≥15