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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