JIS G3101 SS490 ERW Steel Pipe
JIS G3101 SS490 ERW Steel Pipe: Properties, Equivalents and Applications
Comprehensive data on JIS G3101 SS490 ERW pipe: chemical composition, mechanical and physical properties, international equivalents, similar materials, and application guidance.
Hot rolling, cold forming, electric resistance welding (ERW), bending, punching, machining, galvanising (optional)
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
JIS G3101 SS490 ERW Steel Pipe Introduction
JIS G3101 SS490 is a carbon structural steel widely used for welded pipes in general structures. When manufactured as Electric Resistance Welded (ERW) pipe, the material retains the essential characteristics of SS490: good weldability, moderate strength, and adequate ductility for cold forming. Typical pipe products comply with the supplementary standard JIS G3444 STK490 or directly use SS490 sheet/coil. SS490 provides a minimum yield strength of 245 MPa and a tensile strength in the range of 490–610 MPa, making it suitable for load-bearing applications in building frames, scaffolding, mechanical components, and agricultural equipment. The material is delivered in as-rolled condition or normalised, and it is not designed for low-temperature impact service. Its chemical composition is intentionally left broad (only P and S restricted) to facilitate multiple production routes and thickness ranges while maintaining the required mechanical properties.
JIS G3101 SS490 ERW Steel Pipe Chemical Composition
The chemical composition of SS490 follows JIS G3101. Only phosphorus and sulfur have maximum limits; other elements like carbon and manganese are not specified, allowing flexibility for the manufacturer to achieve the required mechanical properties. Typical product analysis for ERW pipe base material may show a carbon content in the range of 0.15–0.25% and manganese of 0.50–1.20%, but these values are not mandatory.
| Element | Standard Value | Remarks |
|---|---|---|
| C | Not specified | Typically controlled to meet strength & weldability |
| Si | Not specified | Normally ≤ 0.40% |
| Mn | Not specified | Often 0.50–1.50% in practice |
| P | ≤ 0.050% | Max limit for all product forms |
| S | ≤ 0.050% | Max limit for all product forms |
| Fe | Balance | Remaining base element |
JIS G3101 SS490 ERW Steel Pipe Thermal and Electrical Physical Properties
The following physical properties are typical for carbon structural steel in the range of SS490 composition. They are not part of the mandatory requirements of JIS G3101 but are widely accepted for engineering calculations. Slight variations may occur depending on the exact chemical composition and processing route of the ERW pipe.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Elastic Modulus (E) | 205 | GPa | Ambient |
| Shear Modulus (G) | 80 | GPa | Calculated |
| Poisson's Ratio (ν) | 0.29 | – | Elastic range |
| Thermal Expansion Coefficient (α) | 11.7 × 10⁻⁶ | /K | 20–100 °C |
| Thermal Expansion Coefficient (α) | 12.2 × 10⁻⁶ | /K | 20–200 °C |
| Thermal Conductivity (λ) | 51.9 | W/(m·K) | 20 °C |
| Specific Heat Capacity (cp) | 486 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρe) | 0.142 | μΩ·m | 20 °C |
JIS G3101 SS490 ERW Steel Pipe Mechanical Properties
Mechanical properties are specified in JIS G3101 for plates, sheets, and strips used to manufacture ERW pipes. For finished pipes, reference is often made to JIS G3444 STK490. The values below represent the minimum requirements for the base material, tested on flat specimens in the rolling direction. Pipe mechanical tests may show slightly different elongation values depending on the specimen geometry. No impact test is required for this grade.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Point or Yield Strength (ReH) | ≥ 245 | MPa | Thickness (t) ≤ 16 mm |
| Yield Point or Yield Strength (ReH) | ≥ 235 | MPa | 16 mm < t ≤ 40 mm |
| Yield Point or Yield Strength (ReH) | ≥ 215 | MPa | 40 mm < t ≤ 100 mm |
| Tensile Strength (Rm) | 490 – 610 | MPa | All thicknesses |
| Elongation (A) | ≥ 17 | % | t ≤ 5 mm (No. 1A test piece) |
| Elongation (A) | ≥ 21 | % | 5 mm < t ≤ 16 mm (No. 1A) |
| Elongation (A) | ≥ 17 | % | 16 mm < t ≤ 50 mm (No. 4 test piece) |
| Elongation (A) | ≥ 19 | % | t > 50 mm (No. 4 test piece) |
| Bend Test (180°) | No cracks | – | t ≤ 16 mm, inner radius = 0.5t |
| Bend Test (180°) | No cracks | – | t > 16 mm, inner radius = 1.0t |
| Impact Energy (KV) | Not required | J | Ambient temperature |
JIS G3101 SS490 ERW Steel Pipe Fully Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | ISO 630-2 | Fe490 | Equivalent grade for structural steel |
| Europe | EN 10025-2 | S275JR / S275J0 / S275J2 | Comparable strength level (yield 275 MPa, tensile 430–580 MPa); chemical control differs |
| China | GB/T 700 | Q275 | Similar carbon structural steel (yield ≥ 275 MPa, tensile 490–610 MPa) |
| Germany (historical) | DIN 17100 | St50-2 | Predecessor to EN S275; comparable mechanical values |
| Japan (alternative for pipes) | JIS G3444 | STK490 | ERW structural carbon steel tube with equivalent mechanical properties derived from SS490 |
JIS G3101 SS490 ERW Steel Pipe Application Introduction
JIS G3101 SS490 ERW pipe is designed for general structural applications where moderate strength and good weldability are required. It is not intended for pressure-containing parts or low-temperature service. Typical usage spans from lightweight constructions to medium-duty frameworks. The pipe can be supplied in black (uncoated) or hot-dip galvanised. Processing includes cutting, drilling, welding, and bending.
- Standard pipe dimensions follow JIS G3444 or customer specifications.
- Galvanising improves corrosion resistance for outdoor use.
- For dynamic or fatigue-loaded structures, consult relevant design codes.
Product Applications: ERW round, square, and rectangular structural pipes, Scaffolding tubes, Greenhouse frames, Street light poles, Traffic sign supports, Structural hollow sections for columns and beams
Processed into products: Building columns and steel studs, Roof trusses and purlins, Equipment frames and machine bases, Racks and storage systems, Fence posts and gates, Exhaust and ventilation ducts (non-pressure)
Application industries: Construction and building frameworks, Agricultural machinery and greenhouses, Automotive and transportation (chassis, supports), Furniture and shelving systems, Material handling and conveyors, Guardrails, handrails, and fencing, General engineering and workshop applications
JIS G3101 SS490 ERW Steel Pipe Similar or Alternative Materials with Comparable Performance
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-2 | S355JR/J0/J2 | Higher yield strength (≥ 355 MPa) and tensile strength (510–680 MPa); suitable for demanding structural applications |
| China | GB/T 1591 | Q345B | Widely used HSLA structural steel; yield ≥ 345 MPa, offers better strength-to-weight ratio |
| USA | ASTM A572 | Grade 50 | Yield ≥ 345 MPa, tensile ≥ 450 MPa; often used as an upgrade over SS490 |
| USA | ASTM A36 | A36 | Yield ≥ 250 MPa, tensile 400–550 MPa; slightly lower strength but higher availability for construction |
| India | IS 2062 | E300 | Yield ≥ 300 MPa, tensile 500–620 MPa; close alternative for general structural usage |
Notes:
The information provided is based on JIS G3101:2020 for SS490 base material and typical data for ERW pipes. For finished pipes, additional standards (e.g., JIS G3444 STK490) may apply, with supplementary requirements on dimensions, straightness, and non-destructive testing. When welding pre-galvanised pipes, appropriate safety measures must be taken due to zinc fumes. Users should verify the specific inspection certificate for the actual product batch.
- Share
