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Introduction to JIS G3106 Steel Plate

Apr 02, 2024

Introduction to JIS G3106 Steel Plate

JIS G3106 specification applies to hot-rolled carbon steel plates for welded structures. Steel grades include: SM400A/B/C, SM490A/B/C, SM490YA/YB, SM520B/C, SM570.

application:

SM400A/B/C: Structural quality carbon steel sections, plates and rods for riveted, bolted or welded construction of bridges and buildings and general structural purposes.
SM490A/B/C: hot-rolled steel plates for outdoor engineering, ships, and military (armor) construction.
SM490YA/YB: Extra heavy steel plates for welded structures in bridge and highway construction.
SM520B/C: Extra heavy steel plate for welded structures. It is also a low-carbon, high-strength structural steel with good cold forming properties.
SM570: Low alloy high-strength steel plate, thick steel plate for mechanical parts, jibs, cranes, chassis, construction 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

SM400A

SM400B

SM400C

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

SM490A

SM490B

SM490C

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

SM490YA

SM490YB

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

SM520B

SM520C

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:

ASTM DIN BS EN AFNOR UNI JIS GOST
A 570
Gr.40
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

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