Introduction to JIS G3106 Steel Plate
JIS G3106 is a Japanese industrial standard that specifies hot-rolled carbon steel plates used in welded structures. This standard includes various steel grades such as SM400A, SM400B, SM400C, SM490A, SM490B, SM490C, SM490YA, SM490YB, SM520B, SM520C, and SM570. These materials are widely used in construction, shipbuilding, engineering, and mechanical applications due to their strength, durability, and cost-effectiveness.
Applications:
- SM400A/B/C: Used for structural components in bridges, buildings, and general construction where high-quality carbon steel is required.
- SM490A/B/C: Ideal for outdoor engineering projects, ships, and military structures due to their good mechanical properties and corrosion resistance.
- SM490YA/YB: Designed for extra-heavy welded structures in bridge and highway construction, offering enhanced strength and toughness.
- SM520B/C: Suitable for heavy-duty welded structures with excellent cold-forming capabilities and low-carbon content.
- SM570: A low-alloy high-strength steel plate used in mechanical parts, cranes, jibs, and heavy construction equipment.
JIS G3106 Chemical Composition:
| Symbol |
Chemical composition |
| C max |
Si max |
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 Properties:
| Symbol |
Yield point or proof stress (N/mm², min) |
Tensile strength (N/mm²) |
Elongation |
| Thickness of steel (mm) |
Thickness of steel (mm) |
Thickness |
Test piece |
% min |
| 16 or under |
Over 16–40 |
100 or under |
| SM400A / B / C |
245 |
235 |
400–510 |
<5 |
NO.5 |
23 |
| ≥5 <16 |
NO.1A |
19 |
| ≥16 <50 |
NO.1A |
22 |
| SM490A / B / C |
325 |
315 |
490–610 |
<5 |
NO.5 |
22 |
| ≥5 <16 |
NO.1A |
17 |
| ≥16 <50 |
NO.1A |
21 |
| SM490YA / YB |
365 |
355 |
490–610 |
<5 |
NO.5 |
19 |
| ≥5 <16 |
NO.1A |
15 |
| ≥16 <50 |
NO.1A |
19 |
| SM520B / C |
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 Charpy Absorption Energy:
| Grade Symbol |
Test Temperature (°C) |
Charpy 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 Standards:
| 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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