JIS G3106 SM570 ERW Pipe
JIS G3106 SM570 ERW Pipe: High-Strength Structural Steel Tube for Welded Structures
Explore the complete material data for JIS G3106 SM570 electric-resistance-welded (ERW) pipe. Includes chemical composition, mechanical and thermal properties, international equivalents, and application guidance for structural engineering.
Electric resistance welding (ERW) from hot-rolled coil; subsequent cold forming, sizing, and straightening; applicable welding processes: SMAW, GMAW, SAW, FCAW
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JIS G3106 SM570 ERW Pipe Introduction
JIS G3106 SM570 ERW pipe is a high-strength carbon steel tube manufactured by electric resistance welding of hot-rolled SM570 steel strip or plate. SM570 is a weldable structural steel with minimum yield strength of 460 MPa for thin sections, offering an excellent balance of strength, toughness, and weldability.
The ERW process produces a uniform, dimensionally accurate tube suitable for structural, mechanical, and pressure applications. Key features include:
- High yield & tensile strength for weight reduction
- Good formability and weldability
- Typical delivery in as-welded or stress-relieved condition
JIS G3106 SM570 ERW Pipe Chemical Composition
The following table lists the chemical requirements for SM570 steel according to JIS G3106:2015. Microalloying elements such as Nb, V, or Ti may be added to achieve the specified mechanical properties.
For thicknesses above 12.5 mm, a maximum carbon equivalent (CEV) of 0.44% is typically applied.
| Element | Standard Value (max, %) | Remarks |
|---|---|---|
| Carbon (C) | 0.18 | CEV = C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 |
| Silicon (Si) | 0.55 | - |
| Manganese (Mn) | 1.60 | Higher Mn may be used for thicker sections |
| Phosphorus (P) | 0.035 | - |
| Sulfur (S) | 0.035 | - |
| Others (Nb, V, Ti, etc.) | Microalloy additions as required | Not specified; typical grain refiners used |
JIS G3106 SM570 ERW Pipe Thermal and Electrical Physical Properties
The following values are typical for SM570 grade steel at room temperature and serve as engineering guidelines. These are not standardised requirements but are commonly used for design calculations.
Properties may vary with temperature and processing history.
| Property | Typical Value | Unit | Test Conditions |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | Ambient temperature |
| Young's Modulus (E) | 205 | GPa | Ambient temperature |
| Shear Modulus (G) | 79.3 | GPa | Ambient temperature |
| Poisson's Ratio (ν) | 0.30 | - | Ambient temperature |
| Thermal Expansion Coefficient (α) | 11.7 × 10⁻⁶ | K⁻¹ | 20–100 °C range |
| Thermal Conductivity (λ) | 46 | W/(m·K) | Ambient temperature |
| Specific Heat Capacity (c) | 470 | J/(kg·K) | Ambient temperature |
| Electrical Resistivity (ρₑ) | 0.16 × 10⁻⁶ | Ω·m | Ambient temperature |
JIS G3106 SM570 ERW Pipe Mechanical Properties
Mechanical properties depend on wall thickness (t) and test piece orientation. As-welded ERW pipes are normally tested on the parent metal; the weld seam efficiency may reduce properties slightly unless full normalisation is applied.
The table shows the minimum values for flat specimens taken from the original strip (longitudinal direction) according to JIS G3106.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 460 | MPa | t ≤ 16 mm |
| Yield Strength (ReH) | ≥ 450 | MPa | 16 < t ≤ 40 mm |
| Yield Strength (ReH) | ≥ 430 | MPa | 40 < t ≤ 75 mm |
| Yield Strength (ReH) | ≥ 420 | MPa | 75 < t ≤ 100 mm |
| Tensile Strength (Rm) | 570 – 720 | MPa | t ≤ 100 mm |
| Tensile Strength (Rm) | 570 – 720 | MPa | 100 < t ≤ 160 mm |
| Tensile Strength (Rm) | 570 – 720 | MPa | 160 < t ≤ 200 mm |
| Elongation (A) | ≥ 20 | % | t ≤ 5 mm, JIS No.5 test piece, long. |
| Elongation (A) | ≥ 20 | % | 5 < t ≤ 16 mm, JIS No.1A, long. |
| Elongation (A) | ≥ 26 | % | 16 < t ≤ 50 mm, JIS No.1A, long. |
| Elongation (A) | ≥ 24 | % | t > 40 mm, JIS No.4, long. |
| Bend Test (180°) | No cracks | - | t ≤ 16 mm, inner radius = 2.0t |
| Bend Test (180°) | No cracks | - | 16 < t ≤ 100 mm, inner radius = 3.0t |
| Bend Test (180°) | No cracks | - | t > 100 mm, inner radius = 4.0t |
JIS G3106 SM570 ERW Pipe Directly Corresponding Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-4 | S460M / S460ML | Thermo-mechanical rolled, similar YS/Tensile range. M indicates TMCP, L for low temp. toughness. |
| China | GB/T 1591-2018 | Q460D / Q460E | High strength low alloy structural steel. D and E provide better low-temperature impact properties. |
| International | ISO 4951-2 | S460Q | Quenched and tempered condition available, otherwise similar strength. |
| USA (approximate) | ASTM A572/A572M | Grade 65 | Yield 450 MPa, tensile 550 MPa – slightly lower than SM570. Use for non-critical substitution. |
| India | IS 8500 | Fe 570 | Corresponds to 570 MPa tensile class steel, weldable fine grain structural steel. |
JIS G3106 SM570 ERW Pipe Application Introduction
SM570 ERW pipes are widely used in industries where high strength, good weldability, and moderate weight are critical. Typical applications include:
- Structural hollow sections for columns, beams, and trusses
- Piling and foundation pipes
- Mechanical tubing for heavy equipment booms and frames
- Pressure piping (with additional certification)
Product Applications: Welded structural frames and trusses, Bridge arches and support structures, Spiral welded pipe for piling, Hydraulic cylinder bodies, Conveyor rollers and machinery housings
Processed into products: Column and beam connectors, Boom sections for excavators, Wind turbine tower internals, Jack-up rig legs, Pipe-in-pipe systems for subsea applications
Application industries: Construction and Civil Engineering, Shipbuilding and Offshore, Heavy Machinery and Cranes, Transmission and Telecommunication Towers, Automotive and Transportation (heavy trailers, chassis)
JIS G3106 SM570 ERW Pipe Comparable Materials with Similar Mechanical Performance
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3106 | SM490YA/B | Lower yield (≥ 365 MPa) but excellent weldability; suitable where strength requirements are lower. |
| Europe | EN 10025-2 | S355J2 | Yield 355 MPa class; often used as a lower-cost alternative for less stressed components. |
| USA | ASTM A572 | Grade 50 | Yield 345 MPa, equivalent to S355; frequently substituted where SM570 strength is not fully required. |
| China | GB/T 1591 | Q355D | Similar rationale – lower strength but similar fabrication characteristics. |
| Japan | JIS G3106 | SM570 TMC | Same standard, with guaranteed thermo-mechanical control processing and often improved toughness. |
Notes:
ERW pipe specific considerations: The electric resistance welding process creates a heat-affected zone (HAZ) with slightly altered properties. If the application requires uniform toughness across the weld seam, a post-weld heat treatment (normalizing or stress relieving) is recommended.
Ordering information: Specify dimensions, quantity, length, and any supplementary requirements (e.g., Charpy impact test temperature and energy). SM570 does not inherently require impact testing; suffix 'C' (SM570C) indicates guaranteed 0°C impact toughness of minimum 47 J (longitudinal). Consult with the manufacturer for availability.
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