JIS G3106 SM490YB Steel Plate | SM490YB Mill Direct Supply
What is JIS G3106 SM490YB Steel Plate?
As a professional steel plate supplier and China Mill-Direct Exporter, SHH STEEL is pleased to present JIS G3106 SM490YB Steel Plate.
SM490YB is a rolled steel for welded structures under the Japanese Industrial Standard JIS G3106. It provides a higher minimum yield strength of 365 MPa (for thickness ≤ 16 mm) while maintaining the tensile strength range of 490–610 MPa. The “YB” designation indicates the higher yield strength version of SM490 with mandatory Charpy impact testing at 0°C (minimum 27 J). This combination makes it suitable for structural applications requiring both higher design strength and moderate low-temperature toughness.
This grade belongs to the JIS G3106 STEEL PLATE series. SHH STEEL supplies SM490YB 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 | SM490YB | Confirmed |
| Delivery Condition | As-rolled / Normalized / TMCP | Available |
| Product Form | Steel Plate | Available |
| Thickness Range | 6 mm – 100 mm (typical) | 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) | ≤ 0.20 (t ≤ 50 mm) ≤ 0.22 (t > 50 mm) | ≤ 0.24 |
| 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: Controlled carbon and manganese contents allow higher yield strength while preserving good weldability and toughness.
Mechanical Properties
Mechanical properties of JIS G3106 SM490YB:
| Thickness (mm) | Yield Strength ReH (min) | Tensile Strength Rm | Elongation A (min) | Impact Energy KV (min) |
|---|---|---|---|---|
| ≤ 16 | 365 MPa | 490 – 610 MPa | 19% / 15%* | 27 J at 0°C |
| > 16 ≤ 40 | 355 MPa | 490 – 610 MPa | 19% / 15%* | 27 J at 0°C |
| > 40 ≤ 75 | 335 MPa | 490 – 610 MPa | 19% / 15%* | 27 J at 0°C |
| > 75 ≤ 100 | 325 MPa | 490 – 610 MPa | 15% | 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 SM490YB 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.)
Tolerance
Dimensional tolerances for SM490YB 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
SM490YB has good weldability for a higher-yield-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, 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 |
|---|---|---|
| SM490YB | JIS G3106 | — |
| Q345B / Q355B | GB/T 1591 | Closest Chinese equivalents |
| S355J0 / S355JR | EN 10025-2 | European equivalents |
| ASTM A572 Grade 50 | ASTM | Approximate American equivalent |
| SM490Y | JIS G3106 | Related higher-yield grades |
Applications
JIS G3106 SM490YB is widely used in higher-yield-strength welded structures requiring moderate toughness. Typical applications include:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| Building Structures | Beams, columns, frames – SM490YB Structural Steel |
| Bridges | Main girders, components – SM490YB Bridge |
| Machinery | Heavy frames, supports – SM490YB Machinery |
| Containers & Storage | Tanks, containers – SM490YB Container |
| General Fabrication | High-strength welded structures – SM490YB Fabrication |
| Shipbuilding & Offshore | Structural parts requiring toughness – SM490YB Shipbuilding |
Why Choose SHH STEEL
SHH STEEL provides SM490YB 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 SM490YB Steel Plate.
Customers benefit from reliable supply, short lead times and cost-effective solutions for high-yield-strength structural steel projects worldwide. Our professional export team provides technical support and customized processing services to meet project requirements.
FAQ
- What does the “YB” in SM490YB mean?“Y” indicates the higher yield strength version of the SM490 series, and “B” indicates that Charpy impact testing is required at 0°C with a minimum of 27 J.
- What is the difference between SM490YA and SM490YB?Both have the same higher yield strength (365 MPa). SM490YA has no mandatory impact test, while SM490YB requires impact testing at 0°C (27 J).
- Is SM490YB equivalent to ASTM A572 Grade 50?Yes, SM490YB is commonly considered a close equivalent to ASTM A572 Grade 50, with higher yield strength in thinner plates and specified impact toughness.
Conclusion
JIS G3106 SM490YB Steel Plate from SHH STEEL is a high-yield-strength weldable structural steel offering 365 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 SM490YB steel plate requirements.
Contact SHH STEEL today for stock availability, pricing and technical support. JIS G3106 SM490YB Steel Plate, SM490YB steel plate, SM490YB, SM490YB Mill Direct Supply, SM490YB supplier, SM490YB equivalent
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