JIS G3101 SS490 Structural Steel for SSAW Pipes
JIS G3101 SS490 Structural Steel for SSAW Pipes - Properties, Equivalents & Applications
Comprehensive material data for JIS G3101 SS490 steel used in spiral submerged arc welded (SSAW) pipes. Includes chemical composition, mechanical and physical properties, international equivalents, and application guide.
Hot rolling, cold forming, welding, machining, drilling, cutting, and coating.
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JIS G3101 SS490 Structural Steel for SSAW Pipes Introduction
JIS G3101 SS490 is a carbon structural steel grade widely used for general structural applications, including the manufacture of spiral submerged arc welded (SSAW) pipes. It features a minimum tensile strength of 490 MPa and good weldability, formability, and machinability. The steel is typically supplied in hot-rolled condition and can be used in welded, bolted, and riveted structures. Main characteristics include:
- Reliable mechanical properties with specified yield and tensile strength across thickness ranges.
- Good ductility suitable for cold forming and pipe making.
- Controlled carbon and manganese content ensures adequate weldability.
- Cost-effective material for structural and pressure applications.
JIS G3101 SS490 Structural Steel for SSAW Pipes Chemical Composition
Chemical composition limits according to JIS G3101:2015 for SS490 steel. Values are maximum unless a range is indicated. The steel is not microalloyed; the strength is achieved through carbon and manganese content.
- Phosphorus and sulfur are restricted to ensure toughness and weldability.
- Silicon is used for deoxidation; in rimmed or capped steel, Si content may be lower.
| Element | Standard Value (%) | Remarks |
|---|---|---|
| Carbon (C) | 0.22 max | Melting analysis |
| Silicon (Si) | 0.55 max | For killed steel; for rimmed/capped steel may be ≤0.10 |
| Manganese (Mn) | 1.60 max | May be reduced for thickness >40 mm by agreement |
| Phosphorus (P) | 0.050 max | Melting analysis |
| Sulfur (S) | 0.050 max | Melting analysis |
JIS G3101 SS490 Structural Steel for SSAW Pipes Thermal and Electrical Physical Properties
The following physical properties are typical for carbon steels similar to SS490 and are not specified in JIS G3101. They are provided for design guidance at room temperature unless otherwise noted.
- Values may vary with temperature and exact composition.
- Magnetic properties: Ferromagnetic.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Elastic Modulus (E) | 205 | GPa | At 20 °C |
| Shear Modulus (G) | 79 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.30 | — | Room temperature |
| Thermal Expansion (α) | 12.0 | 10⁻⁶/K | 20-100 °C |
| Thermal Conductivity (λ) | 51.9 | W/(m·K) | At 20 °C |
| Specific Heat Capacity (cp) | 486 | J/(kg·K) | Room temperature |
| Electrical Resistivity (ρe) | 0.15 | μΩ·m | At 20 °C |
JIS G3101 SS490 Structural Steel for SSAW Pipes Mechanical Properties
Mechanical properties as per JIS G3101:2015, based on hot-rolled condition. The values are minimum unless a range is given. Different thickness categories affect yield strength and elongation. Bend test required with specified mandrel diameters.
- Tensile test pieces: No. 1A for plates and flats, No. 2 for bars, No. 5 for pipes (not detailed here).
- Elongation values depend on test piece and thickness.
- Impact test is not mandatory; if required by agreement, values are subject to negotiation.
| Property | Standard Value | Unit | Test Condition / Thickness |
|---|---|---|---|
| Yield Strength (ReH) | 285 min | MPa | t ≤ 16 mm |
| Yield Strength (ReH) | 275 min | MPa | 16 mm < t ≤ 40 mm |
| Yield Strength (ReH) | 255 min | MPa | 40 mm < t ≤ 100 mm |
| Yield Strength (ReH) | 225 min | MPa | t > 100 mm |
| Tensile Strength (Rm) | 490 - 610 | MPa | All thicknesses |
| Elongation (A) | 23 min | % | No.1A test piece, t ≤ 16 mm |
| Elongation (A) | 21 min | % | No.1A test piece, 16 mm < t ≤ 40 mm |
| Elongation (A) | 17 min | % | No.1A test piece, 40 mm < t ≤ 100 mm |
| Elongation (A) | 23 min | % | No.1A test piece, t > 100 mm (standard requires agreement) |
| Bend Test (Mandrel dia.) | 1.5 × thickness | — | t ≤ 16 mm, 180° bend |
| Bend Test (Mandrel dia.) | 2.0 × thickness | — | 16 mm < t ≤ 100 mm, 180° bend |
JIS G3101 SS490 Structural Steel for SSAW Pipes Fully Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3101 | SS490 | Original standard |
| International | ISO 630-2 | Fe490 | Closely equivalent in strength and chemistry |
| China | GB/T 700 | Q275 | Yield and tensile strength match; chemistry similar |
| South Korea | KS D 3503 | SS490 | Identical to JIS G3101 SS490 |
| Europe | EN 10025-2 | S275JR | Slightly lower tensile strength (430-580 MPa); similar yield; may be used with caution |
| USA | ASTM A36 | A36 | Lower tensile strength (400-550 MPa); not a direct equivalent but often substituted for general structures |
JIS G3101 SS490 Structural Steel for SSAW Pipes Application Introduction
JIS G3101 SS490 steel is extensively applied in structural engineering and pipe manufacturing. Its balanced strength and ductility make it suitable for spiral submerged arc welded (SSAW) pipes used in:
- Oil and gas transmission
- Water supply and sewage systems
- Piling and foundation works
- Structural supports and columns
The material can be processed into various components through cutting, welding, and forming.
Product Applications: SSAW steel pipes, I-beams, H-beams, channels, Plates for bridge girders, Storage tank shells, Piling pipes, Pipeline fittings (elbows, tees, reducers), Steel pipe piles
Processed into products: Welded pipe joints, Flanges, Steel column base plates, Structural brackets, Pile end plates, Gusset plates, Rib stiffeners
Application industries: Construction and Civil Engineering, Oil and Gas (Transmission Pipelines), Water Treatment and Supply, Shipbuilding, Machinery Manufacturing, Automotive (chassis and structural parts), Steel Structure Fabrication
JIS G3101 SS490 Structural Steel for SSAW Pipes Similar or Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3106 | SM490A | Higher notch toughness, used for welded structures; slightly different chemistry |
| China | GB/T 1591 | Q345B | Higher strength grade, but often used in similar applications; careful welding procedure required |
| Europe | EN 10025-2 | S355JR | Higher yield and tensile strength; suitable for substitute with design adjustment |
| USA | ASTM A572 | Grade 42 | Minimum yield 290 MPa, tensile 415 MPa; may be considered for light structures |
| India | IS 2062 | E250 (Fe 410WA) | Lower strength, but widely available for general structural use; not for direct substitution without re-design |
Notes:
Important Considerations:
- For SSAW pipe applications, supplementary requirements for weld seam toughness and hydrostatic testing are often specified by the pipe standard (e.g., API 5L, AWWA C200, or ISO 3183).
- SS490 does not have mandatory impact requirements; if low-temperature service is needed, consider JIS G3106 SM490B or equivalent.
- When substituting with international grades, verify the complete set of mechanical and chemical requirements, and adapt welding procedures accordingly.
- The data provided are based on JIS G3101:2015 and typical physical property references for carbon steel. For critical designs, consult the latest official standard and material test certificates.
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