SM490B ERW Pipe
SM490B ERW Pipe: High-Strength Welded Structural Steel to JIS G3106
Detailed material data for SM490B electric-resistance-welded pipe: chemical composition, mechanical and thermal properties, international equivalents, and typical applications in welded structures.
Cold bending, hot forming, welding, cutting, machining, galvanizing
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SM490B ERW Pipe Introduction
SM490B ERW pipe is a low-alloy high-strength structural steel tube manufactured by electric resistance welding, conforming to Japanese Industrial Standard JIS G3106 (Welded Structures). With a minimum yield strength of 325 MPa and tensile strength of 490–610 MPa, it offers excellent weldability and toughness at 0 °C. Its balanced chemistry of ≤0.18% C and ≤1.60% Mn ensures good formability and suitability for cold and hot working. The material is widely used in building frameworks, bridges, construction machinery, and offshore structures, delivering reliable performance under static and dynamic loads.
SM490B ERW Pipe Chemical Composition
Chemical requirements per JIS G3106:2015 for SM490B steel. Carbon equivalent (CE) may be specified by agreement. The controlled low carbon content ensures good weldability, while manganese provides necessary strength.
| Chemical Element | Standard Value (wt%) | Remarks |
|---|---|---|
| C | ≤ 0.18 | |
| Si | ≤ 0.55 | |
| Mn | ≤ 1.60 | |
| P | ≤ 0.035 | |
| S | ≤ 0.035 | |
| CE (optional) | ≤ 0.44 | Carbon equivalent = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15, when agreed |
SM490B ERW Pipe Thermal and Electrical Physical Properties
Typical physical values for SM490B steel at room temperature. These are guideline data, not standard requirements. Properties may vary slightly with heat treatment and composition.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Modulus of Elasticity (E) | 205 | GPa | At 20 °C |
| Shear Modulus (G) | 80 | GPa | Calculated from E and ν ≈ 0.3 |
| Poisson's Ratio (ν) | 0.3 | - | |
| Thermal Expansion Coefficient (α) | 11.7 | 10⁻⁶/K | Between 20 °C and 100 °C |
| Thermal Conductivity (λ) | 51.9 | W/(m·K) | At 20 °C |
| Specific Heat Capacity | 486 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρ_e) | 0.22 | Ω·mm²/m | At 20 °C |
SM490B ERW Pipe Mechanical Properties
Minimum mechanical properties according to JIS G3106 for SM490B pipe with wall thickness ≤ 16 mm. For thicker sections or other specimen orientations, refer to the standard. Impact temperature is 0 °C, designated by grade suffix 'B'.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 325 | MPa | Transverse or longitudinal, wall thickness ≤ 16 mm |
| Tensile Strength (Rm) | 490 – 610 | MPa | All thicknesses |
| Elongation (A) | ≥ 22 (longitudinal) / ≥ 17 (transverse) | % | Gauge length 50 mm (No.11 test piece) or 5.65√So, wall thickness ≤ 16 mm |
| Bend Test | No cracks after 180° bending | Former diameter = 1.5 t (t = wall thickness ≤ 16 mm) | |
| Charpy Impact (KV₂) | ≥ 47 (average), ≥ 33 (individual) | J | V-notch, 0 °C, longitudinal specimen taken from pipe |
SM490B ERW Pipe Fully Equivalent or Substitute Grades by Standard
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3106 | SM490B | The exact grade for ERW pipe |
| Europe | EN 10025-2 | S355J0 | Equivalent in terms of strength and 0°C impact requirements; chemical differences may exist |
| USA | ASTM A572 / A572M | Grade 50 (Type 1) | Commonly used structural steel with similar minimum yield strength (345 MPa); impact test must be specified separately |
| China | GB/T 1591 | Q345B | Comparable low-alloy structural steel; minimum yield 345 MPa, 0°C impact average 34 J (slightly lower than SM490B) |
| International | ISO 630-2 | E355D | Designated for structural hollow sections; minimum yield 355 MPa, impact at 0°C (min 40 J average) |
SM490B ERW Pipe Application Introduction
SM490B ERW pipe combines high strength, excellent weldability, and moderate notch toughness at 0°C, making it suitable for a wide range of welded structures. It is commonly used in heavy-duty frameworks and dynamically loaded components. The electric resistance welding process ensures consistent wall thickness and smooth surface finish, ideal for further fabrication such as cutting, drilling, and galvanizing.
Product Applications: Structural hollow sections for welded building frames, Bridge piers and caissons, Pipe columns and roof trusses, Overhead crane girders, Tubular scaffolding and support systems, Wind turbine tower internals
Processed into products: Welded joints and gusseted connections, Drilled and machined brackets, flanges, and base plates, Bent tubing for handrails and guardrails, Galvanized pipe sections for outdoor structures, Laser-cut profiles for modular construction, Turned pipe ends for mechanical couplings
Application industries: Building and construction (columns, beams, trusses, space frames), Bridge engineering (arch bridges, pedestrian bridges, temporary structures), Offshore and marine (platform legs, pump caissons, supports), Material handling and logistics (conveyor frames, racking systems, crane booms), Machinery manufacturing (vehicle chassis, agricultural equipment, excavator arms)
SM490B ERW Pipe Closely Related or Similar Performance Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3106 | SM490YB | Higher yield point steel (min yield 365 MPa) for structural tubes, similar weldability |
| Europe | EN 10219-1 | S355J0H | Hollow section grade derived from S355J0, directly comparable in strength and toughness |
| China | GB/T 8162 | 20Mn2 (AISI 1524) | Seamless structural tube steel with Mn content around 1.60%, good weldability, lower impact rating |
| USA | ASTM A500 | Grade C | Cold-formed welded structural tubing; min yield 345 MPa, but no impact requirement unless agreed |
Notes:
Additional Notes:
- SM490B ERW pipe is supplied in lengths up to 12 m, with common diameters from 21.7 mm to 609.6 mm and wall thicknesses up to 22 mm.
- Hydrostatic testing or non-destructive inspection of the weld seam is typically performed in accordance with JIS G3106 or customer requirements.
- CE max of 0.44% can be agreed for better control of weldability and hardenability.
- For dynamic loading, design with appropriate safety factors and consider post-weld heat treatment if residual stress reduction is required.
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