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 covers a range of steel grades, including SM400A/B/C, SM490A/B/C, SM490YA/YB, SM520B/C, and SM570. These materials are widely used in various engineering applications due to their mechanical properties and structural reliability.
Applications:
- SM400A/B/C: Ideal for structural components in bridges, buildings, and general construction where welding, bolting, or riveting is involved.
- SM490A/B/C: Suitable for outdoor engineering projects, shipbuilding, and military (armor) structures.
- SM490YA/YB: Designed for heavy-duty welded structures in bridge and highway construction.
- SM520B/C: High-strength low-carbon steel ideal for heavy welded structures with good cold-forming characteristics.
- SM570: A low-alloy high-strength steel used in thick plates for mechanical parts, jibs, cranes, chassis, and mobile equipment.
JIS G3106 Chemical Composition
| Symbol | Chemical composition | ||||
|---|---|---|---|---|---|
| C max | Si max | Mn | P max | S max | |
| SM400A | 0.23 | - | 2.5x C 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/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 | ||||
| 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 |
| SM570 | 460 | 450 | 570–720 | ≥5 <16 | NO.5 | 26 |
| SM570 | 460 | 450 | 570–720 | ≥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 | S275JR St44-2 | 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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