SM490YA is a high-strength, low-alloy structural steel defined by the JIS G3106 standard, primarily used for welded structures in applications like bridges, ships, vehicles, and construction machinery. Below are its key material properties based on available data:
Chemical Composition (Ladle Analysis, Max %)
Carbon (C): ≤0.20
Silicon (Si): ≤0.55
Manganese (Mn): ≤1.60
Phosphorus (P): ≤0.035
Sulfur (S): ≤0.035 Note: The carbon equivalent (Ceq) is calculated as Ceq = [C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15]%, ensuring good weldability due to its low carbon content.
Mechanical Properties
Yield Strength (σs): ≥365 MPa (for thickness ≤16 mm)
Tensile Strength (σb): 490–610 MPa
Elongation (δ): ≥19%
Charpy Impact Energy: Specific values depend on testing conditions but are designed for good toughness in welded applications. Note: Properties may vary slightly with thickness; for thicker plates (>16 mm), yield strength may decrease.
Physical Properties
Density: Typical for low-carbon steel, approximately 7.85 g/cm³ (not explicitly stated but inferred from similar steels).
Weldability: Excellent due to low carbon equivalent, suitable for conventional welding methods.
Ductility: Highly ductile, allowing deformation without cracking under stress.
Corrosion Resistance: Not inherently corrosion-resistant but can be coated or treated for enhanced resistance in harsh environments.
Delivery Condition
Typically supplied in hot-rolled, normalized, quenched + tempered, or tempered conditions, with options for controlled rolling or cooling per agreement.
Applications
SM490YA is used in structures requiring high strength and excellent welding performance, such as:
Bridges
Ships
Petroleum storage tanks
Containers
Construction vehicles and machinery (e.g., booms, cranes, chassis)
Equivalent Grades
European equivalent: S355J2(+N) (EN 10250-2, steel number 1.0570), though exact equivalence should be verified for specific applications.
Additional Notes
SM490YA is part of the JIS G3106 family, which includes grades like SM400A/B/C, SM490A/B/C, SM520B/C, and SM570, each with varying strength and toughness properties.
Its low carbon content enhances cold-forming properties, making it suitable for complex structural components.
For precise specifications or stock availability, contact suppliers like Bebon Steel or JFS Steel, who offer machining and customization services.
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