SM490 is a structural steel grade standardized under the Japanese Industrial Standards (JIS G 3106). It is widely used in construction and engineering due to its balanced strength and weldability.
Below are its key properties:
Mechanical Properties
Tensile Strength: Minimum 490 MPa (megapascals).- Yield Strength: Typically ≥ 325 MPa (varies slightly by grade).
- Elongation: Approximately 17–21% (measured over a 50 mm gauge length), indicating good ductility.
- Impact Toughness:
SM490A: No Charpy impact requirement.
SM490B: Tested at 0°C (min. 27 J).
SM490C: Tested at -20°C (min. 27 J).
Chemical Composition (Typical %)
- Carbon (C): ≤ 0.20% (ensures weldability).
- Manganese (Mn): ≤ 1.40% (enhances strength).
- Silicon (Si): ≤ 0.55%.
- Phosphorus (P): ≤ 0.035%.
- Sulfur (S): ≤ 0.035%.
Trace elements like Cu, Cr, or Ni may be present in weathering-resistant variants (e.g., SM490Y).
Physical Properties
Density: ~7.85 g/cm³.- Modulus of Elasticity: ~200 GPa.
- Poisson's Ratio: ~0.3.
- Thermal Expansion Coefficient: ~12 × 10⁻⁶/°C.
- Melting Point: ~1420–1460°C.
Grades
- SM490A: Basic grade, no impact testing.
- SM490B/C: Improved toughness for low-temperature applications.
- SM490YA/YB: Weathering variants with added corrosion resistance (e.g., Cu, Cr, Ni).
Applications
- Building frameworks, bridges, and heavy machinery.
- Ships, vehicles, and infrastructure require weldability and strength.
- Weather-resistant grades (YA/YB) for outdoor structures.
Processing & Fabrication
Weldability: Excellent due to low carbon content; preheating may be needed for thick sections.
Formability: Suitable for rolling, bending, and cutting.
Heat Treatment: Typically supplied in as-rolled or normalized condition.
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FAQ
Q: What is SM490 material?
A: SM490 is rolled steel for welded structure. S represents steel and M represents welding. 400 is also the lower limit tensile strength of 400MPa and impact at 0℃. SM490 is divided into three levels: SM490A, SM490B and SM490C.
Q: What is the ASTM equivalent of SM490 steel?
A: ASTM A572 Grade 50
SM490A steel is roughly equivalent to ASTM A572 Grade 50 in terms of its properties and applications.
Q: What are the properties of sm490 steel?
A: Tensile Strength: Minimum 490 MPa (megapascals). Yield Strength: Typically ≥ 325 MPa (varies slightly by grade). Elongation: Approximately 17–21% (measured over a 50 mm gauge length), indicating good ductility. Impact Toughness: SM490A: No Charpy impact requirement.
Q: What is SM490YB material?
A: JIS G3106 SM490YB steel plate is a kind steel with low carbon, high strength for weld structural parts. JIS G3106 SM490YB structural steel plate carbon steel sheet is usually supplied in normalized or control rolled delivery condition.
Q: What is SM490YA equivalent to?
A: SM490YA steel grade is equivalent to the Chinese high weathering steel Q345GNH, but it is not the same, and its composition and properties are somewhat different. SM490YA steel plate executive standard: JISG 3106; SM490YA steel plate delivery status: hot rolled, normalized, quenched + tempered or tempered.
| Other steel plate | ||||
| Name | Material | Specification (mm) | Tons | Remark |
| Low Alloy | Q345A, Q345B, Q345C, Q345D, Q345E, Q390, Q420, Q460C, ST52-3, S355J2+N, SS400, SA302GrC, S275NL, 35CrMo | 6 - 350 | 5788.56 | Normalizing, tempered ,controlled rolling, hot rolling , Hot rolling,1st inspection, 2nd inspection, 3rd inspection |
| Pressure Vessel Plate | Q245R, Q345R, Q370R, 16MnDR, 09MnNiDR, 15CrMoR, 14Cr1MoR, 12Cr2Mo1R, SA516Gr60, SA516Gr70, SA516Gr485, SA285, SA387Gr11, SA387Gr12, SA387Gr22, P265,P295,P355GH,Q245R(R-HIC),Q345R(R-HIC) | 3 - 300 | 8650 | Normalizing, tempered ,controlled rolling, hot rolling , Hot rolling,1st inspection, 2nd inspection, 3rd inspection |
| High-Strength Plate | WH785D/E,Q960D/E, Q890D/E,WH60D/E,WH70B,Q550D,Q590D,Q690D/E | 8 - 120 | 3086.352 | Quenched and tempered |
| Wear-Resistant Plate | NM360, NM400, NM450, NM500 | 6 - 150 | 3866.297 | Quenched and tempered |
| Bridge Plate | Q235qC, Q345qC, Q370qC, Q420qC, Q345qDNH, Q370qDNH, A709 - 50F - 2, A709 - 50T - 2 | 8 - 200 | 2853.621 | Hot rolling, normalized ,hot rolling controlled rolling, quenched and tempered + toughness and brittleness |
