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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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