JIS G3106 SM490YA SSAW Pipe Steel
JIS G3106 SM490YA SSAW Pipe Steel: High-Strength Weldable Structural Material Data
Comprehensive analysis of SM490YA steel grade under JIS G3106 for spiral submerged arc welded pipes, including chemical composition, mechanical properties, thermal performance, and international equivalents.
Submerged arc welding (SAW), spiral forming, cold forming, hot bending, gas cutting, plasma cutting
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JIS G3106 SM490YA SSAW Pipe Steel Introduction
SM490YA, specified in JIS G3106, is a high-strength low-alloy structural steel designed for welded structures, primarily used in the manufacture of spiral submerged arc welded (SSAW) pipes. It offers an optimized balance of strength, toughness, and weldability, with a minimum yield strength of 365 MPa for thin gauges and a tensile strength range of 490–610 MPa. The 'Y' designation guarantees minimum yield strength, while the 'A' suffix indicates impact testing at 0 °C, ensuring reliable notch toughness. This grade is widely applied in civil engineering, offshore platforms, pressure vessels, and large-diameter pipelines. Its chemical composition is carefully controlled to enhance weldability and resistance to cracking, making it suitable for both domestic and international structural projects.
JIS G3106 SM490YA SSAW Pipe Steel Chemical Composition
The chemical limits for SM490YA are defined in JIS G3106. Values are maximum unless a range is indicated. The steel is fully killed and fine-grained, with controlled carbon equivalent to ensure excellent weldability. Note: For thicknesses above certain limits, microalloying elements may be added by agreement to meet mechanical requirements, but are not mandatory per standard.
| Element | Standard Value (max, unless range) | Remarks |
|---|---|---|
| C | ≤0.20 | Ladle analysis |
| Si | ≤0.55 | Ladle analysis |
| Mn | ≤1.65 | Ladle analysis |
| P | ≤0.035 | Ladle analysis |
| S | ≤0.035 | Ladle analysis |
| Ceq (IIW) | ≤0.42 (typical) | Often specified for weldability; not a mandatory standard element |
JIS G3106 SM490YA SSAW Pipe Steel Thermal & Electrical Physical Properties
Physical properties are not part of JIS G3106 but are typical for carbon‑manganese structural steels with similar composition. Values are referenced from established engineering databases and are valid at room temperature except where noted. Caution: Thermal properties can vary with temperature and processing history. Use for design guidance only.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Ambient temperature |
| Elastic Modulus (E) | 205 | GPa | Ambient temperature |
| Shear Modulus (G) | 80 | GPa | Ambient temperature |
| Poisson's Ratio (ν) | 0.3 | — | Ambient temperature |
| Thermal Expansion Coefficient (α) | 12.0×10⁻⁶ | K⁻¹ | 20–200 °C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | Ambient temperature |
| Specific Heat Capacity | 460 | J/(kg·K) | Ambient temperature |
| Electrical Resistivity (ρₑ) | 0.22 | μΩ·m | Ambient temperature |
JIS G3106 SM490YA SSAW Pipe Steel Mechanical Properties
Tensile test properties accord with JIS G3106. Yield strength varies with plate thickness; tensile strength is a range. Elongation minimum values are given for JIS No.5 test piece in transverse direction. Impact tests (Charpy V-notch) are required for thickness >12 mm at 0 °C. Note: Values for plates up to 100 mm thickness; for SSAW pipe, the pipe body properties are derived from plate properties.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥365 | MPa | Thickness ≤16 mm |
| Yield Strength (ReH) | ≥355 | MPa | Thickness 16–40 mm |
| Yield Strength (ReH) | ≥335 | MPa | Thickness 40–75 mm |
| Yield Strength (ReH) | ≥325 | MPa | Thickness 75–100 mm |
| Tensile Strength (Rm) | 490–610 | MPa | All thicknesses ≤100 mm |
| Elongation (A) | ≥15 | % | Thickness ≤16 mm, JIS No.5, transverse |
| Elongation (A) | ≥19 | % | Thickness 16–50 mm, JIS No.5, transverse |
| Elongation (A) | ≥19 | % | Thickness >50–100 mm, JIS No.5, transverse |
| Impact Energy (KV₂) | ≥27 | J | 0 °C, thickness >12 mm, Charpy V-notch, transverse |
JIS G3106 SM490YA SSAW Pipe Steel Full Equivalent Grades and Substitutable Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-2 | S355J0 | Same strength level, Charpy KV at 0 °C ≥27 J |
| USA | ASTM A572/A572M | Grade 50 | 355 MPa min yield, similar tensile range |
| China | GB/T 1591 | Q355D | ≥355 MPa yield, impact at -20 °C (slightly stricter) |
| International | ISO 4950-2 | E355 | Yield 355 MPa min for hot-rolled high yield strength steel |
| India | IS 2062 | E410B | Comparable strength and weldability, limited impact data |
JIS G3106 SM490YA SSAW Pipe Steel Application Introduction
SM490YA SSAW pipes are selected for projects demanding high strength, good weldability, and moderate toughness. The SSAW manufacturing process allows economical production of large-diameter line pipes with high dimensional accuracy. Suitable for both onshore and offshore environments, these pipes can be coated, lined and field-bent as required. Engineering design should reference actual thickness-dependent properties.
Product Applications: Spiral welded line pipe, Structural hollow sections, Large-diameter piling pipe, Casing pipes for wells, Penstocks and hydro-power conduits
Processed into products: Pipe spools and bends, Flanges and fittings (forged from equivalent grade), Pipe piles and monopile foundations, Transition pieces for offshore wind towers, Girder flanges and columns (when cut from plate)
Application industries: Oil & gas transmission (cross-country pipelines), Water supply and drainage systems, Structural engineering (bridges, stadiums, high-rise buildings), Marine and offshore structures (jackets, risers, piles), Piling and foundation engineering, Pressure vessels and storage tanks (by agreement)
JIS G3106 SM490YA SSAW Pipe Steel Similar/Alternative Materials with Close Mechanical Properties
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3106 | SM490A | No guaranteed yield strength, lower yield but same tensile range |
| Japan | JIS G3106 | SM490B | Guaranteed impact at 0 °C, yield strength slightly lower than YA |
| Europe | EN 10025-2 | S275J0 | Lower strength (275 MPa yield), may serve where lower loads apply |
| USA | ASTM A572 | Grade 42/45 | Lower strength grades, comparable weldability and toughness |
| China | GB/T 700 | Q235C | Much lower strength, general structural applications |
Notes:
SM490YA may be supplied with supplementary requirements such as ultrasonic testing, through-thickness tensile testing (Z-quality), and specific carbon equivalent limits. For SSAW pipe, the pipe body properties may differ slightly from the plate due to forming and welding; longitudinal and transverse properties should be confirmed with the pipe manufacturer. This grade is not intended for sour service (H₂S) or high-temperature pressure containment unless verified by specific qualification. Suitable welding consumables matching the strength and toughness should be employed.
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