JIS G3106 specification is for hot rolled carbon steel plate for welded structrual purposes, steel grades include: SM400A/B/C, SM490A/B/C, SM490YA/YB, SM520B/C,SM570.
SM400A/B/C: Carbon steel shapes, plates, and bars of structural quality for use in riveted, bolted, or welded construction of bridges and buildings, and for general structural purposes.
SM490A/B/C: Hot rolled steel plate used for outside engineering, ships, military (armored) construction.
SM490YA/YB: Super heavy steel plate for welded structure of bridges, highway construction.
SM520B/C: Super heavy steel plate for welded structure, it is also low carbon high strength structural steel with good cold forming property.
SM570: Low alloy and high strength steel plate, heavy and wide plate for machinery parts, boom, crane, chassis, buildings bridges and mobile equipment.

JIS G3106 Chemical Composition:

Symbol  Chemical composition
C max Simax Mn   P max S max
SM400A 0.23 - 2.5xc min 0.035 0.035
SM400B 0.20 0.35 0.6-1.40 0.035 0.035
SM400C 0.19 0.35 1.4 max 0.035 0.035
SM490A 0.20 0.55 1.6 max 0.035 0.035
SM490B 0.19 0.55 1.6 max 0.035 0.035
SM490C 0.19 0.55 1.6 max 0.035 0.035
SM490YA 0.20 0.55 1.6 max 0.035 0.035
SM490YB 0.20 0.55 1.6 max 0.035 0.035
SM520B 0.20 0.55 1.6 max 0.035 0.035
SM520C 0.20 0.55 1.6 max 0.035 0.035
SM570 0.19 0.55 1.6 max 0.035 0.035

JIS G3106 Mechanical Property:

Symbol Yield point or proof stressN/mm2 (min) Tensile strengthN/mm2 Elongation
Thickness of steel mm Thickness of steel mm thinckness Test piece % min
16 or under Over 16-40 100 or under




245 235 400-510 <5 NO.5 23
≥5 <16 NO.1A 19
≥16 <50 NO.1A 22




325 315 490-610 <5 NO.5 22
≥5 <16 NO.1A 17
≥16 <50 NO.1A 21



365 355 490-610 <5 NO.5 19
≥5 <16 NO.1A 15
≥16 <50 NO.1A 19



365 355 520-640 <5 NO.5 19
≥5 <16 NO.1A 15
≥16 <50 NO.1A 19
SM570 460 450 570-720 <5 NO.5 19
≥5 <16 NO.5 26
≥16 <50 NO.5 20

 JIS G3106 Charp Absorption Energy:

Symbol of grade Test temperature °C Charp Absorption Energy J (min) Test piece
SM400B 0 27 No.4 in rolling direction
SM400C 0 47
SM490B 0 27
SM490C 0 47
SM490YB 0 27
SM520B 0 27
SM520C 0 47
SM570 -5 47

 JIS G3106 Equivalent Steel Standard:

A 570
S275JRSt44-2 Fe 430 B FN
1449 43/25 HR
E 28-2 AE 275 B
Fe 430 B FN
SM 400 A;B;C St4ps; sp
A 572 Gr.65 E335 (Fe 590-2)
St 60-2
Fe 60-2
4360-55 E; 55 C
A 60-2 Fe 60-2
Fe 590
SM 570 St6ps; sp

We supplies JIS G3106 Steel Plate as well as steel coils and welded steel pipes, if you are interested in buying fine Weathering Steel Plate.


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