JIS G3106 SM400C Steel Plate | SM400C Mill Direct Supply
What is JIS G3106 SM400C Steel Plate?
As a professional steel plate supplier and China Mill-Direct Exporter, SHH STEEL is pleased to present JIS G3106 SM400C Steel Plate.
SM400C is a rolled steel for welded structures under the Japanese Industrial Standard JIS G3106. It provides a minimum yield strength of 245 MPa (for thickness ≤ 16 mm) and a tensile strength range of 400–510 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 SM400A and SM400B, 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 SM400C 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 | SM400C | 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) | ≤ 0.35 | ≤ 0.40 |
| Manganese (Mn) | 0.60 – 1.50 | 0.55 – 1.60 |
| Phosphorus (P) | ≤ 0.035 | ≤ 0.040 |
| Sulfur (S) | ≤ 0.035 | ≤ 0.040 |
Note: SM400C has tighter carbon control compared with SM400A and SM400B, contributing to better toughness and weldability consistency.
Mechanical Properties
Mechanical properties of JIS G3106 SM400C:
| Thickness (mm) | Yield Strength ReH (min) | Tensile Strength Rm | Elongation A (min) | Impact Energy KV (min) |
|---|---|---|---|---|
| ≤ 16 | 245 MPa | 400 – 510 MPa | 23% | 27 J at 0°C |
| > 16 ≤ 40 | 235 MPa | 400 – 510 MPa | 22% | 27 J at 0°C |
| > 40 ≤ 75 | 215 MPa | 400 – 510 MPa | 22% / 24%* | 27 J at 0°C |
| > 75 ≤ 100 | 215 MPa | 400 – 510 MPa | 24% | 27 J at 0°C |
*Elongation values may vary slightly depending on test specimen size according to JIS G3106. Density: 7.85 g/cm³ Note: Thickness for SM400C is typically limited compared with SM400A/B grades.
Delivery Conditions
SHH STEEL supplies JIS G3106 SM400C 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 SM400C 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
SM400C has excellent weldability due to its controlled carbon content and balanced chemical composition. It can be welded by all conventional methods (SMAW, GMAW, FCAW, SAW) without special difficulties.
Recommended welding consumables:
| Welding Process | Recommended Consumables |
|---|---|
| SMAW (Stick) | E7018, E7016 |
| GMAW (MIG/MAG) | ER70S-6 |
| FCAW | E71T-1 |
| SAW | EM12K + suitable flux |
Preheating is generally not required for thin and medium thicknesses under normal conditions.
Equivalent Material Grades
| Grade | Standard | Notes |
|---|---|---|
| SM400C | JIS G3106 | — |
| Q235C | GB/T 700 | Closest Chinese equivalent |
| S235J0 / S235J2 | EN 10025-2 | European equivalents |
| ASTM A36 | ASTM | Approximate American equivalent |
| SS400 | JIS G3101 | Related general structural steel |
Applications
JIS G3106 SM400C is widely used in welded structures requiring guaranteed impact toughness. Typical applications include:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| Building Structures | Beams, columns, frames – SM400C Structural Steel |
| Bridges | Secondary members, components – SM400C Bridge |
| Machinery | Base frames, supports – SM400C Machinery |
| Containers & Storage | Tanks, containers – SM400C Container |
| General Fabrication | Welded structures – SM400C Fabrication |
| Shipbuilding & Offshore | Structural parts requiring toughness – SM400C Shipbuilding |
Why Choose SHH STEEL
SHH STEEL provides SM400C 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 SM400C Steel Plate.
Customers benefit from reliable supply, short lead times and cost-effective solutions for 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 SM400C 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 SM400A and SM400B.
- What is the difference between SM400B and SM400C?Both require impact testing at 0°C (27 J). SM400C generally has tighter chemical composition control and is limited to thinner plates, offering more consistent toughness performance.
- Is SM400C equivalent to ASTM A36?Yes, SM400C can be considered an approximate equivalent to ASTM A36 for general structural applications, with the added benefit of specified impact toughness.
- Can SHH STEEL supply SM400C with ultrasonic testing?Yes. Ultrasonic testing and other additional inspections can be arranged according to customer requirements.
Conclusion
JIS G3106 SM400C Steel Plate from SHH STEEL is a reliable weldable structural steel offering 245 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 SM400C steel plate requirements.
Contact SHH STEEL today for stock availability, pricing and technical support. JIS G3106 SM400C Steel Plate, SM400C steel plate, SM400C, SM400C Mill Direct Supply, SM400C supplier, SM400C equivalent
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