What is the difference between SM400A, SM400B and SM400C steel plates

SM400A, SM400B and SM400C steel plates are Japanese standard rolled steel for welding structure, S represents steel, M represents welding, 400 is also the lower limit tensile strength 400MPa, A is the steel plate grade, without impact, B is the steel plate grade, impact at 20℃, C is the steel plate grade, impact at 0℃.

Technical standard for SM400A, SM400B and SM400C steel plates: JIS G3106.

Melting analysis of chemical composition of SM400A, SM400B and SM400C steel plates:

Grade	Thickness	C	Si	Mn	P	S
SM400A	t≤50mm	≤0.23	-	≥2.5	≤0.035	≤0.035
	50<t≤200mm	≤0.25
SM400B	t≤50mm	≤0.20	≤0.35	0.60-1.50	≤0.035	≤0.035
	50<t≤200mm	≤0.22
SM400C	t≤100mm	≤0.18	≤0.35	0.60-1.50	≤0.035	≤0.035

Mechanical properties of SM400A, SM400B and SM400C steel plates:

Grade	Yield point or yield strength, N/m㎡						Tensile strength
	Thickness mm						Thickness mm
	≤16	16<t≤40	40<t≤75	75<t≤100	100<t≤160	100<t≤200	≤100
SM400A	≥245	≥235	≥215	≥215	≥205	≥195	400-510
SM400B	≥245	≥235	≥215	≥215	≥205	-	400-510
SM400C	≥245	≥235	≥215	≥215	-	-	400-510

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