JIS G3106 SM490B Steel Plate | SM490B Mill Direct Supply
What is JIS G3106 SM490B Steel Plate?
As a professional steel plate supplier and China Mill-Direct Exporter, SHH STEEL is pleased to present JIS G3106 SM490B Steel Plate.
SM490B is a rolled steel for welded structures under the Japanese Industrial Standard JIS G3106. It provides a minimum yield strength of 325 MPa (for thickness ≤ 16 mm) and a tensile strength range of 490–610 MPa. Compared with SM490A, the “B” designation requires Charpy impact testing at 0°C with a minimum energy of 27 J, offering better toughness for structural applications where moderate low-temperature performance is needed.
This grade belongs to the JIS G3106 STEEL PLATE series, which covers rolled steels specifically designed for welded structures. SHH STEEL supplies SM490B as Mill Direct Supply, sourcing directly from major Chinese steel mills. This ensures competitive mill pricing, consistent quality, shorter lead times and full traceability. We offer thicknesses from 6 mm to 150 mm (thicker plates available on request), widths up to 3000–4000 mm and lengths up to 12000–18000 mm. Custom cutting, shot blasting and priming services are available. All plates are delivered with full Mill Test Certificates (EN 10204 3.1 or equivalent).
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Primary Standard | JIS G3106 | Full compliance |
| Steel Grade | SM490B | Confirmed |
| Delivery Condition | As-rolled / Normalized / TMCP | Available |
| Product Form | Steel Plate | Available |
| Thickness Range | 6 mm – 150 mm | Custom sizes available |
| Width / Length | Up to 3000–4000 mm / 12000–18000 mm | Custom cutting supported |
| Certification | EN 10204 3.1 / Mill Certificate | Available |
Chemical Composition
Chemical composition according to JIS G3106:
| Element | Ladle Analysis (Max. / Range %) | Product Analysis (Max. / Range %) |
|---|---|---|
| Carbon (C) | ≤ 0.18 (t ≤ 50 mm) ≤ 0.20 (t > 50 mm) | ≤ 0.22 |
| Silicon (Si) | ≤ 0.55 | ≤ 0.60 |
| Manganese (Mn) | ≤ 1.60 | ≤ 1.70 |
| Phosphorus (P) | ≤ 0.035 | ≤ 0.040 |
| Sulfur (S) | ≤ 0.035 | ≤ 0.040 |
Note: SM490B has tighter carbon control compared with SM490A, contributing to better toughness and consistent weldability.
Mechanical Properties
Mechanical properties of JIS G3106 SM490B:
| Thickness (mm) | Yield Strength ReH (min) | Tensile Strength Rm | Elongation A (min) | Impact Energy KV (min) |
|---|---|---|---|---|
| ≤ 16 | 325 MPa | 490 – 610 MPa | 22% / 17%* | 27 J at 0°C |
| > 16 ≤ 40 | 315 MPa | 490 – 610 MPa | 22% / 17%* | 27 J at 0°C |
| > 40 ≤ 75 | 295 MPa | 490 – 610 MPa | 22% / 17%* | 27 J at 0°C |
| > 75 ≤ 100 | 295 MPa | 490 – 610 MPa | 17% | 27 J at 0°C |
| > 100 ≤ 160 | 285 MPa | 490 – 610 MPa | 17% | 27 J at 0°C |
| > 160 ≤ 200 | 275 MPa | 490 – 610 MPa | 17% | 27 J at 0°C |
*Elongation values depend on test specimen size according to JIS G3106. Density: 7.85 g/cm³
Delivery Conditions
SHH STEEL supplies JIS G3106 SM490B steel plate as Mill Direct Supply in as-rolled, normalized or thermomechanically rolled condition according to customer requirements.
Additional options available:
- Shot blasting and shop primer
- Ultrasonic testing (EN 10160 or equivalent)
- Z-direction testing (Z15 / Z25 / Z35)
- Third-party inspection (SGS, BV, TUV, etc.)
Tolerances
Dimensional tolerances for SM490B steel plate follow JIS G3193 or equivalent international standards (EN 10029 / ASTM A6).
- Thickness, width and length tolerances according to the ordered class.
- Flatness according to applicable standard.
- Edge conditions: Mill edge or cut edge (flame / plasma).
Tighter tolerances can be provided upon request.
Weldability
SM490B has good weldability for a higher-strength structural steel. It can be welded by conventional methods (SMAW, GMAW, FCAW, SAW) when proper procedures are followed.
Recommended welding consumables:
| Welding Process | Recommended Consumables |
|---|---|
| SMAW (Stick) | E7018, E7016, E8018 |
| GMAW (MIG/MAG) | ER70S-6, ER80S-D2 |
| FCAW | E71T-1, E81T1 |
| SAW | EM12K / EH14 + suitable flux |
Preheating may be required for thicker plates. Low-hydrogen consumables are recommended.
Equivalent Material Grades
| Grade | Standard | Notes |
|---|---|---|
| SM490B | JIS G3106 | — |
| Q345B / Q345C | GB/T 1591 | Closest Chinese equivalents |
| S355JR / S355J0 | EN 10025-2 | European equivalents |
| ASTM A572 Grade 50 | ASTM | Approximate American equivalent |
| SM490 | JIS G3106 | Related grades |
Applications
JIS G3106 SM490B is widely used in higher-strength welded structures requiring moderate toughness. Typical applications include:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| Building Structures | Beams, columns, frames – SM490B Structural Steel |
| Bridges | Main girders, components – SM490B Bridge |
| Machinery | Heavy frames, supports – SM490B Machinery |
| Containers & Storage | Tanks, containers – SM490B Container |
| General Fabrication | High-strength welded structures – SM490B Fabrication |
| Shipbuilding & Offshore | Structural parts requiring toughness – SM490B Shipbuilding |
Why Choose SHH STEEL
SHH STEEL provides SM490B as Mill Direct Supply. We maintain long-term strategic cooperation with major Chinese steel mills and act as a first-level (primary) agent. This direct mill supply model allows us to offer competitive mill-direct pricing, faster delivery times, stable and traceable quality, and full Mill Test Certificates for JIS G3106 SM490B Steel Plate.
Customers benefit from reliable supply, short lead times and cost-effective solutions for high-strength structural steel projects worldwide. Our professional export team provides technical support and customized processing services to meet project requirements.
FAQ
- What does the “B” in SM490B mean?The “B” indicates that Charpy impact testing is required at 0°C with a minimum average energy of 27 J.
- What is the difference between SM490A and SM490B?Both have the same strength level. SM490A has no mandatory impact test, while SM490B requires impact testing at 0°C (27 J), offering better toughness.
- Is SM490B equivalent to ASTM A572 Grade 50?Yes, SM490B is commonly considered an approximate equivalent to ASTM A572 Grade 50 for structural applications, with the added benefit of specified impact toughness.
Conclusion
JIS G3106 SM490B Steel Plate from SHH STEEL is a high-strength weldable structural steel offering 325 MPa minimum yield strength and guaranteed impact toughness at 0°C. As Mill Direct Supply, we provide competitive pricing, consistent quality and full technical support. Trust SHH STEEL for your SM490B steel plate requirements.
Contact SHH STEEL today for stock availability, pricing and technical support.
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