JIS G3106 SM400A Steel Plate | SM400A Mill Direct Supply
What is JIS G3106 SM400A Steel Plate?
As a professional steel plate supplier and China Mill-Direct Exporter, SHH STEEL is pleased to present JIS G3106 SM400A Steel Plate.
SM400A 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 “A” designation indicates that no Charpy impact test is mandatory, making it a cost-effective choice for general welded structural applications where low-temperature toughness is not a critical requirement.
SHH STEEL supplies SM400A steel plate 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 | SM400A | 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 (Ladle Analysis):
| Element | Requirement (%) |
|---|---|
| Carbon (C) | ≤ 0.23 (t ≤ 50 mm) ≤ 0.25 (t > 50 mm) |
| Silicon (Si) | — |
| Manganese (Mn) | ≥ 2.5 × C |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
Note: The controlled carbon and low phosphorus/sulfur contents ensure good weldability for structural fabrication.
Mechanical Properties
Mechanical properties of JIS G3106 SM400A:
| Thickness (mm) | Yield Strength ReH (min) | Tensile Strength Rm | Elongation A (min) |
|---|---|---|---|
| ≤ 16 | 245 MPa | 400 – 510 MPa | 23% |
| > 16 ≤ 40 | 235 MPa | 400 – 510 MPa | 22% |
| > 40 ≤ 75 | 215 MPa | 400 – 510 MPa | 22% / 24%* |
| > 75 ≤ 100 | 215 MPa | 400 – 510 MPa | 24% |
| > 100 ≤ 160 | 205 MPa | 400 – 510 MPa | 24% |
| > 160 ≤ 200 | 195 MPa | 400 – 510 MPa | 24% |
*Elongation values may vary slightly depending on test specimen size according to JIS G3106. Density: 7.85 g/cm³ Impact Test: Not mandatory for SM400A grade.
Delivery Conditions
SHH STEEL supplies JIS G3106 SM400A 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 SM400A 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
SM400A has excellent weldability due to its controlled carbon content and low impurities. 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 |
|---|---|---|
| SM400A | JIS G3106 | — |
| Q235B / Q235C | GB/T 700 | Closest Chinese equivalents |
| S235JR / S235J0 | EN 10025-2 | European equivalents |
| ASTM A36 | ASTM | Approximate American equivalent |
| SS400 | JIS G3101 | Related general structural steel |
Applications
IS G3106 SM400A is widely used in general welded structures. Typical applications include:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| Building Structures | Beams, columns, frames – SM400A Structural Steel |
| Bridges | Secondary members, components – SM400A Bridge |
| Machinery | Base frames, supports – SM400A Machinery |
| Containers & Storage | Tanks, containers – SM400A Container |
| General Fabrication | Welded structures – SM400A Fabrication |
| Shipbuilding & Offshore | Non-critical structural parts – SM400A Shipbuilding |
Why Choose SHH STEEL
SHH STEEL provides SM400A 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 SM400A 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 “A” in SM400A mean?The “A” indicates that Charpy impact testing is not mandatory for this grade. Grades SM400B and SM400C have specified impact requirements.
- What is the difference between SM400A and SM490A?SM400A has a tensile strength of 400–510 MPa, while SM490A has a higher tensile strength of 490–610 MPa and higher yield strength.
- Is SM400A equivalent to ASTM A36?Yes, SM400A is commonly considered an approximate equivalent to ASTM A36 for general structural applications.
- Can SHH STEEL supply SM400A with ultrasonic testing?Yes. Ultrasonic testing and other additional inspections can be arranged according to customer requirements.
Conclusion
JIS G3106 SM400A Steel Plate from SHH STEEL is a reliable weldable structural steel offering 245 MPa minimum yield strength and good fabrication properties. As Mill Direct Supply, we provide competitive pricing, consistent quality and full technical support. Trust SHH STEEL for your SM400A steel plate requirements.
Contact SHH STEEL today for stock availability, pricing and technical support. JIS G3106 SM400A Steel Plate, SM400A steel plate, SM400A, SM400A Mill Direct Supply, SM400A supplier, SM400A equivalent
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