EN 10025-2 S420J0 Steel for LSAW Pipe
EN 10025-2 S420J0 LSAW Pipe – High Strength Structural Steel for Welded Tubes
Explore the chemical composition, mechanical properties, thermal and electrical physical data of S420J0 steel according to EN 10025-2, used for longitudinal submerged arc welded (LSAW) structural pipes.
Hot rolling, thermomechanical rolling, normalizing rolling, LSAW longitudinal welding, submerged arc welding, cold forming, bending, cutting
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EN 10025-2 S420J0 Steel for LSAW Pipe Introduction
EN 10025-2 S420J0 is a hot-rolled weldable fine-grain structural steel with a minimum yield strength of 420 MPa in the as-rolled or normalized condition. The designation J0 guarantees impact energy of at least 27 J at 0°C. It is widely used for LSAW (Longitudinal Submerged Arc Welded) pipes in demanding structural applications. The steel offers a good combination of high strength, toughness, and excellent weldability, making it suitable for heavy-duty welded fabrications.
- Minimum yield strength 420 MPa (thickness ≤16 mm)
- Charpy impact toughness at 0°C (27 J)
- Good cold formability and welding characteristics
- Available in plate and strip form for manufacturing large-diameter welded pipes
EN 10025-2 S420J0 Steel for LSAW Pipe Chemical Composition
Chemical limits for S420J0 steel according to EN 10025-2. Carbon content depends on nominal thickness. The steel is fully killed (aluminum deoxidized) and may contain microalloying elements for grain refinement.
- Typical C maximum values:≤0.22% (thickness ≤40 mm),≤0.24% (>40-80 mm)
- Mn provides solid solution strengthening and toughness.
- Low P and S ensure good ductility and weldability.
| Element | Standard Value (%) | Remarks |
|---|---|---|
| C | ≤0.22 | Thickness ≤40 mm |
| C | ≤0.24 | Thickness >40 mm to ≤80 mm |
| Si | ≤0.60 | |
| Mn | ≤1.70 | |
| P | ≤0.030 | |
| S | ≤0.030 | |
| N | ≤0.015 | |
| Al (total) | ≥0.015 | For fully killed steel / fine-grain practice |
EN 10025-2 S420J0 Steel for LSAW Pipe Thermal and Electrical Physical Properties
These properties are representative for carbon-manganese structural steels of the S420J0 type at room temperature unless noted otherwise. Values are not part of the mandatory standard but are useful for design and simulation.
- Density ~7850 kg/m³
- Elastic modulus ~210 GPa
- Thermal expansion coefficient ~12 × 10−6/K
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | at 20°C |
| Modulus of elasticity (E) | 210 | GPa | at 20°C |
| Shear modulus (G) | ~80 | GPa | estimated |
| Poisson's ratio (ν) | 0.3 | — | |
| Thermal expansion coefficient (α) | 12.0 | 10−6/K | 20–100°C |
| Thermal conductivity (λ) | 50 | W/(m·K) | at 20°C |
| Specific heat capacity (cp) | 460 | J/(kg·K) | at 20°C |
| Electrical resistivity (ρe) | 0.22 | μΩ·m | at 20°C |
EN 10025-2 S420J0 Steel for LSAW Pipe Mechanical Properties
Mechanical properties for hot-rolled flat and long products according to EN 10025-2. Minimum yield strength, tensile strength, and elongation vary with thickness. Impact energy is verified at 0°C (J0). Bending test requirements apply when agreed at the time of order.
- ReH ≥ 420 MPa for t ≤16 mm, decreasing with thicker sections.
- Rm typically 520–680 MPa for thinner products.
- Charpy-V impact test (longitudinal) at 0°C: average ≥27 J.
| Property | Standard Requirement | Unit | Test Condition / Thickness |
|---|---|---|---|
| Yield strength (ReH) | ≥420 | MPa | Thickness ≤16 mm |
| Yield strength (ReH) | ≥400 | MPa | Thickness >16 mm to ≤40 mm |
| Yield strength (ReH) | ≥390 | MPa | Thickness >40 mm to ≤63 mm |
| Yield strength (ReH) | ≥370 | MPa | Thickness >63 mm to ≤80 mm |
| Yield strength (ReH) | ≥360 | MPa | Thickness >80 mm to ≤100 mm |
| Tensile strength (Rm) | 520–680 | MPa | Thickness ≤40 mm |
| Tensile strength (Rm) | 500–660 | MPa | Thickness >40 mm to ≤100 mm |
| Elongation (A, 5.65√S0) | ≥19 | % | Thickness ≤40 mm |
| Elongation (A, 5.65√S0) | ≥17 | % | Thickness >40 mm to ≤63 mm |
| Elongation (A, 5.65√S0) | ≥15 | % | Thickness >63 mm to ≤80 mm |
| Elongation (A, 5.65√S0) | ≥14 | % | Thickness >80 mm to ≤100 mm |
| Charpy impact KV | ≥27 | J | at 0°C, longitudinal |
| Bend test (180°) | No cracks | Bend diameter: 2t (t ≤16 mm); 2.5t (t >16–40 mm); 3t (t >40–63 mm); 3.5t (t >63–80 mm) – when specified |
EN 10025-2 S420J0 Steel for LSAW Pipe Completely Equivalent Material Standards and Replaceable Designations
| Country / Region | Standard | Designation | Remarks |
|---|---|---|---|
| European Union | EN 10025-2 | S420J0 | Original specification |
| International | ISO 630-2 | S420J0 | Identical technical requirements for structural steel |
| Germany | DIN EN 10025-2 | S420J0 | Adopted EN standard |
EN 10025-2 S420J0 Steel for LSAW Pipe Application Introduction
S420J0 LSAW pipe combines high strength with reliable toughness at 0°C, making it an economical choice for large-scale welded structures. It is widely used in the construction of offshore platforms, wind turbine towers, bridges, and heavy industrial frames. The LSAW manufacturing process allows large diameters (up to 56 inch and more) and wall thicknesses suitable for demanding static and dynamic loads.
Product Applications: Longitudinally Submerged Arc Welded (LSAW) pipes, Structural hollow sections and tubular columns, Piling pipes and foundation casings, Jacket legs and conductors for offshore platforms, Heavy-duty structural frames and trusses
Processed into products: Flanges and bolted connectors for tubular joints, Stiffening rings and diaphragm plates, Transition pieces for wind turbine towers, Base columns and anchor boxes, Support frames and bracings
Application industries: Construction & Infrastructure, Offshore & Marine Engineering, Oil & Gas (structural applications), Renewable Energy (Wind turbine towers and foundations), Shipbuilding and harbor structures
EN 10025-2 S420J0 Steel for LSAW Pipe Similar or Comparable Replacement Materials
| Country / Region | Standard | Designation | Remarks |
|---|---|---|---|
| USA | ASTM A572/A572M | Grade 60 [415] | Yield strength 415 MPa (60 ksi); impact toughness not guaranteed unless supplementary requirements, similar strength level |
| China | GB/T 1591 | Q420C | Yield ≥420 MPa, impact at 0°C ≥34 J; closely matches S420J0 but with slightly higher impact requirement |
| Japan | JIS G3106 | SM490YA | Yield ≥365 MPa for t≤16 mm; toughness at 0°C; lower yield but often substituted for higher strength structural work |
| EU (cold forming) | EN 10149-2 | S420MC | Thermomechanically rolled high-strength steel for cold forming; similar yield but often used for different product forms, impact at -20°C if J2 |
Notes:
The user should verify specific thickness tolerances and impact test requirements for LSAW pipe as per the applicable pipe standard (e.g., EN 10219 for cold-formed welded structural hollow sections or API 2B for offshore structures). When ordering, supplementary requirements such as through-thickness properties (Z-quality) or specific weld seam toughness may be specified.
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