JIS G3106 SM490YA ERW Pipe
JIS G3106 SM490YA ERW Pipe: High-Strength Structural Steel for Welded Applications
Comprehensive technical data for JIS G3106 SM490YA ERW pipe, including chemical composition, mechanical properties, thermal and electrical properties, equivalent grades, and application guidance.
Hot rolling, cold forming, welding (ERW, arc welding), cutting, machining
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JIS G3106 SM490YA ERW Pipe Introduction
SM490YA is a high-strength structural steel grade specified in JIS G3106, designed for welded structures. It provides enhanced yield strength (365 MPa for thin sections) and excellent weldability, making it ideal for electric resistance welded (ERW) pipes used in construction, bridges, and industrial applications. Key features:
- High yield and tensile strength
- Good ductility and toughness
- Reliable weldability suited for ERW process
JIS G3106 SM490YA ERW Pipe Chemical Composition
Chemical composition of SM490YA according to JIS G3106. Limits are specified to ensure good weldability and mechanical properties. Main elements:
- C ≤ 0.20
- Si ≤ 0.55
- Mn ≤ 1.65
- P ≤ 0.035
- S ≤ 0.035
Minor additions may include microalloying elements for grain refinement.
| Chemical Element | Standard Value (max, %) | Remarks |
|---|---|---|
| Carbon (C) | 0.20 | max |
| Silicon (Si) | 0.55 | max |
| Manganese (Mn) | 1.65 | max |
| Phosphorus (P) | 0.035 | max |
| Sulfur (S) | 0.035 | max |
| Others | - | Optional Nb, V, Ti for property improvement |
JIS G3106 SM490YA ERW Pipe Thermal and Electrical Physical Properties
Typical physical properties for SM490YA and similar carbon-manganese structural steels. Actual values may vary slightly with composition and heat treatment. Provided for reference purposes.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Elastic Modulus (E) | 200 | GPa | At 20°C |
| Shear Modulus (G) | 80 | GPa | Calculated |
| Poisson's Ratio (ν) | 0.3 | — | — |
| Thermal Expansion Coefficient (α) | 12 × 10⁻⁶ | K⁻¹ | 20-100°C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | At 20°C |
| Specific Heat Capacity (c) | 460 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρ_e) | 0.22 × 10⁻⁶ | Ω·m | At 20°C |
JIS G3106 SM490YA ERW Pipe Mechanical Properties
Mechanical properties of SM490YA as per JIS G3106 tensile tests. Values vary with thickness. Notes:
- Yield strength (ReH) depends on thickness
- Elongation measured using standard test pieces
- Impact test not mandatory for SM490YA
| Property | Standard Requirement | Unit | Test Condition / Thickness |
|---|---|---|---|
| Yield Strength (ReH) | ≥365 | MPa | Thickness ≤16 mm |
| Yield Strength (ReH) | ≥355 | MPa | Thickness 16 |
| Yield Strength (ReH) | ≥335 | MPa | Thickness 40 |
| Yield Strength (ReH) | ≥325 | MPa | Thickness 75 |
| Tensile Strength (Rm) | 490-610 | MPa | All thickness |
| Elongation (A) | ≥22 | % | Thickness ≤5 mm, L0=200 mm (No.1A test piece) |
| Elongation (A) | ≥17 | % | Thickness 5 |
| Elongation (A) | ≥21 | % | Thickness 16 |
| Elongation (A) | ≥25 | % | Thickness 50 |
| Bend Test (180°) | No cracks | - | Mandrel dia. = 1.5 × thickness (t≤25 mm) |
| Impact Energy (KV2) | Not specified (optional) | J | By agreement only |
JIS G3106 SM490YA ERW Pipe Fully Equivalent Material Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3106 | SM490YA | Original grade |
| European Union | EN 10025-2 | S355J0 | Yield 355 MPa, tensile 470-630 MPa |
| USA | ASTM A572/A572M | Grade 50 [345S] | Yield 345 MPa; close substitute |
| China | GB/T 1591 | Q345C / Q355C | Q345C yield 345 MPa; new Q355C matches |
| International | ISO 630-2 | Fe510C | Yield 355 MPa, tensile 490-630 MPa |
JIS G3106 SM490YA ERW Pipe Application Introduction
SM490YA ERW pipes are widely used in welded structural applications demanding high strength and ease of fabrication. They can be processed into various shapes and components.
Product Applications: Structural tubes and hollow sections, ERW pipes for fluid, water, steam transport, Scaffolding tubes, Piles and foundation pipes, Rolled steel sections (channels, angles), Welded H-beams
Processed into products: Pipe fittings and flanges, Brackets and support structures, Framing elements in buildings, Bridge truss members, Offshore platform braces, Machinery frames and bases, Structural columns and beams
Application industries: Construction and infrastructure, Bridge engineering, Shipbuilding, Machinery manufacturing, Offshore structures, Transportation (automotive, railway), Pressure vessels (with limitations), Agricultural equipment
JIS G3106 SM490YA ERW Pipe Similar/Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3106 | SM490A | Lower yield (≥325 MPa), more economical |
| Japan | JIS G3106 | SM490B | With Charpy at 0°C, similar strength |
| Japan | JIS G3106 | SM490YB | Higher yield variant for thick sections |
| Japan | JIS G3106 | SM520B | Tensile 520 MPa, yield 365 MPa |
| USA | ASTM A572/A572M | Grade 55 [380S] | Yield 380 MPa, better match |
| EU | EN 10025-2 | S355K2 | Higher toughness at -20°C |
Notes:
Additional information: ERW pipes made from SM490YA may require supplementary testing such as flattening, flaring, and weld seam integrity per applicable pipe standards (e.g., JIS G 3452 or JIS G 3444). Welding: Suitable for all common arc welding processes. Preheat may be necessary for thicker welds. Always consult the manufacturer's recommendations and applicable standards.
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