JIS G3106 SM490C Steel Plate | SM490C Mill Direct Supply
What is JIS G3106 SM490C Steel Plate?
As a professional steel plate supplier and China Mill-Direct Exporter, SHH STEEL is pleased to present JIS G3106 SM490C Steel Plate.
SM490C 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. The “C” designation requires Charpy impact testing at 0°C with a minimum energy of 27 J and generally applies to a more restricted thickness range compared with SM490A and SM490B, offering better toughness consistency for critical welded applications.
This grade belongs to the JIS G3106 STEEL PLATE series, which covers rolled steels specifically designed for welded structures. SHH STEEL supplies SM490C 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 100 mm (subject to standard limitations), 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 | SM490C | Confirmed |
| Delivery Condition | As-rolled / Normalized / TMCP | Available |
| Product Form | Steel Plate | Available |
| Thickness Range | 6 mm – 100 mm (typical limit) | 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: SM490C has tighter carbon control compared with SM490A, contributing to better toughness consistency and weldability.
Mechanical Properties
Mechanical properties of JIS G3106 SM490C:
| 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 |
*Elongation values depend on test specimen size according to JIS G3106. Density: 7.85 g/cm³ Note: Thickness for SM490C is typically limited compared with SM490A/B grades.
Delivery Conditions
SHH STEEL supplies JIS G3106 SM490C 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 SM490C 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
SM490C 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 |
|---|---|---|
| SM490C | JIS G3106 | — |
| Q345C | GB/T 1591 | Closest Chinese equivalent |
| S355J0 / S355J2 | EN 10025-2 | European equivalents |
| ASTM A572 Grade 50 | ASTM | Approximate American equivalent |
| SM490 | JIS G3106 | Related grades |
Applications
JIS G3106 SM490C is widely used in higher-strength welded structures requiring guaranteed impact toughness. Typical applications include:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| Building Structures | Beams, columns, frames – SM490C Structural Steel |
| Bridges | Main girders, components – SM490C Bridge |
| Machinery | Heavy frames, supports – SM490C Machinery |
| Containers & Storage | Tanks, containers – SM490C Container |
| General Fabrication | High-strength welded structures – SM490C Fabrication |
| Shipbuilding & Offshore | Structural parts requiring toughness – SM490C Shipbuilding |
Why Choose SHH STEEL
SHH STEEL provides SM490C 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 SM490C 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 “C” in SM490C mean?The “C” indicates that Charpy impact testing is required at 0°C with a minimum average energy of 27 J, and the grade is typically supplied in a more restricted thickness range than SM490A and SM490B.
- What is the difference between SM490B and SM490C?Both require impact testing at 0°C (27 J). SM490C generally has tighter chemical composition control and is limited to thinner plates, offering more consistent toughness performance.
- Is SM490C equivalent to ASTM A572 Grade 50?Yes, SM490C can be considered an approximate equivalent to ASTM A572 Grade 50 for structural applications, with the added benefit of specified impact toughness.
- What is the density of SM490C?7.85 g/cm³.
Conclusion
JIS G3106 SM490C 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 SM490C steel plate requirements.
Contact SHH STEEL today for stock availability, pricing and technical support. JIS G3106 SM490C Steel Plate, SM490C steel plate, SM490C, SM490C Mill Direct Supply, SM490C supplier, SM490C equivalent
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