JIS G3106 SM400B Steel Plate | SM400B Mill Direct Supply
What is JIS G3106 SM400B Steel Plate?
As a professional steel plate supplier and China Mill-Direct Exporter, SHH STEEL is pleased to present JIS G3106 SM400B Steel Plate.
SM400B 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. Compared with SM400A, 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.
SHH STEEL supplies SM400B 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 | SM400B | 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) | ≤ 0.20 (t ≤ 50 mm) ≤ 0.22 (t > 50 mm) |
| Silicon (Si) | ≤ 0.35 |
| Manganese (Mn) | 0.60 – 1.50 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
Note: The controlled carbon content and defined manganese range ensure good weldability and toughness for structural fabrication.
Mechanical Properties
Mechanical properties of JIS G3106 SM400B:
| 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 |
| > 100 ≤ 160 | 205 MPa | 400 – 510 MPa | 24% | 27 J at 0°C |
| > 160 ≤ 200 | 195 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
Delivery Conditions
SHH STEEL supplies JIS G3106 SM400B 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 SM400B 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
SM400B 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 |
|---|---|---|
| SM400B | 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
JIS G3106 SM400B is widely used in welded structures requiring moderate toughness. Typical applications include:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| Building Structures | Beams, columns, frames – SM400B Structural Steel |
| Bridges | Secondary members, components – SM400B Bridge |
| Machinery | Base frames, supports – SM400B Machinery |
| Containers & Storage | Tanks, containers – SM400B Container |
| General Fabrication | Welded structures – SM400B Fabrication |
| Shipbuilding & Offshore | Non-critical structural parts – SM400B Shipbuilding |
Why Choose SHH STEEL
SHH STEEL provides SM400B 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 SM400B 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 “B” in SM400B 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 SM400A and SM400B?Both have the same strength level. SM400A has no mandatory impact test, while SM400B requires impact testing at 0°C (27 J), offering better toughness.
- Is SM400B equivalent to ASTM A36?Yes, SM400B is commonly considered an approximate equivalent to ASTM A36 for general structural applications, with the added benefit of specified impact toughness.
- What is the density of SM400B?7.85 g/cm³.
- Can SHH STEEL supply SM400B with ultrasonic testing?Yes. Ultrasonic testing and other additional inspections can be arranged according to customer requirements.
Conclusion
JIS G3106 SM400B 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 SM400B steel plate requirements.
Contact SHH STEEL today for stock availability, pricing and technical support. JIS G3106 SM400B Steel Plate, SM400B steel plate, SM400B, SM400B Mill Direct Supply, SM400B supplier, SM400B equivalent
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