EN 10025-2 S275JR Steel for LSAW Pipe
EN 10025-2 S275JR Steel for LSAW Pipe - Properties, Equivalents & Applications
Comprehensive data sheet for S275JR non-alloy structural steel according to EN 10025-2, including chemical composition, mechanical and physical properties, and guidance for LSAW pipe applications.
Hot rolling, normalizing, welding (LSAW, SMAW, SAW, GMAW), gas/plasma cutting, cold forming, machining
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EN 10025-2 S275JR Steel for LSAW Pipe Introduction
S275JR is a hot-rolled non-alloy structural steel grade defined in EN 10025-2. It is characterized by a minimum yield strength of 275 MPa and a balanced combination of strength, ductility, and weldability. The designation "JR" indicates guaranteed impact energy of 27 J at +20°C. The material is widely used in welded structures, civil engineering, and the manufacture of longitudinally submerged arc welded (LSAW) pipes.
- Good weldability without special preheating for moderate thicknesses
- Reliable toughness at ambient temperature
- Suitable for hot-dip galvanizing
- Available in various delivery conditions: as-rolled (+AR) or normalized (+N)
LSAW pipes made from S275JR are employed for low-pressure fluid transport, structural pilings, and mechanical tubing, offering cost-effective performance.
EN 10025-2 S275JR Steel for LSAW Pipe Chemical Composition
The chemical composition of S275JR according to EN 10025-2 is given below. Values represent maximum limits unless a range is shown. For thicknesses >40 mm, a slightly higher carbon content is allowed. Silicon is not specified but typically ranges 0.15–0.35%. The steel is killed (fully deoxidized) and has low impurity levels to ensure good weldability and toughness.
| Element | Maximum value | Notes |
|---|---|---|
| Carbon (C) | 0.21% | 0.22% for thickness > 40 mm |
| Manganese (Mn) | 1.50% | Applies to rolled products |
| Phosphorus (P) | 0.035% | |
| Sulfur (S) | 0.035% | |
| Nitrogen (N) | 0.012% | If sufficient aluminium is present, N may be higher |
| Copper (Cu) | 0.55% | Plate and wide flats; for sections may be different |
EN 10025-2 S275JR Steel for LSAW Pipe Thermal and Electrical Physical Properties
The following physical properties are typical for S275JR carbon-manganese structural steel at room temperature, unless otherwise noted. These values are not mandatory requirements of EN 10025-2 but serve as reliable engineering approximations for design calculations. Properties may vary with temperature and processing conditions.
| Property | Typical value | Unit | Test condition |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | Ambient temperature |
| Elastic modulus (E) | 210 | GPa | Ambient temperature |
| Shear modulus (G) | 81 | GPa | Ambient temperature |
| Poisson ratio (ν) | 0.3 | – | Ambient temperature |
| Thermal expansion coefficient (α) | 11.7e-6 | /K | 20–100°C |
| Thermal conductivity (λ) | 52 | W/(m·K) | 20°C |
| Specific heat capacity | 460 | J/(kg·K) | 20°C |
| Electrical resistivity (ρ_e) | 0.15e-6 | Ω·m | Ambient temperature |
EN 10025-2 S275JR Steel for LSAW Pipe Mechanical Properties
The mechanical properties of S275JR are specified in EN 10025-2 and depend on the product thickness. The following table gives the minimum required values for different thickness ranges. Tensile strength is constant up to 100 mm. Impact testing is carried out on longitudinal Charpy-V specimens at +20°C, requiring at least 27 J. Bending tests must be free from cracks.
| Property | Required value | Unit | Test condition |
|---|---|---|---|
| Yield strength (ReH) | ≥ 275 | MPa | Thickness ≤ 16 mm |
| Yield strength (ReH) | ≥ 265 | MPa | 16 < thickness ≤ 40 mm |
| Yield strength (ReH) | ≥ 255 | MPa | 40 < thickness ≤ 63 mm |
| Yield strength (ReH) | ≥ 245 | MPa | 63 < thickness ≤ 80 mm |
| Yield strength (ReH) | ≥ 235 | MPa | 80 < thickness ≤ 100 mm |
| Tensile strength (Rm) | 410 – 560 | MPa | Thickness ≤ 100 mm |
| Elongation (A) | ≥ 23 | % | Longitudinal, L₀ = 5.65√S₀, thickness ≤ 40 mm |
| Elongation (A) | ≥ 22 | % | Longitudinal, thickness 40 < ≤ 63 mm |
| Elongation (A) | ≥ 21 | % | Longitudinal, thickness 63 < ≤ 100 mm |
| Bend test (bend mandrel diameter) | 1t (d = t) | – | Thickness ≤ 16 mm |
| Bend test (bend mandrel diameter) | 2t | – | 16 < thickness ≤ 100 mm |
| Impact energy (KV) | ≥ 27 | J | Charpy-V, longitudinal, +20°C |
EN 10025-2 S275JR Steel for LSAW Pipe Identical Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-2 | S275JR | Original designation |
| Germany | DIN EN 10025-2 | S275JR | Identical |
| France | NF EN 10025-2 | S275JR | Identical |
| United Kingdom | BS EN 10025-2 | S275JR | Identical |
| Italy | UNI EN 10025-2 | S275JR | Identical |
| Spain | UNE EN 10025-2 | S275JR | Identical |
| Poland | PN EN 10025-2 | S275JR | Identical |
| Sweden | SS EN 10025-2 | S275JR | Identical |
EN 10025-2 S275JR Steel for LSAW Pipe Application Introduction
S275JR is a versatile structural steel ideal for welded, bolted, and riveted constructions. Its balanced carbon content and low impurity levels ensure good weldability with conventional methods, making it suitable for LSAW pipe production. It can be used without normalizing for many structural applications, although normalized condition (+N) improves toughness and formability.
Typical industries and products include:
Product Applications: Longitudinally submerged arc welded (LSAW) pipes for fluid transport and structural piling, Hot-rolled plates, sheets, and coils for further fabrication, Wide flange beams, channels, angles, and hollow sections, Welded structures and storage tanks, Bridge components and industrial flooring
Processed into products: Pipe body and connectors of LSAW pipes, Columns, beams, and trusses in steel buildings, Bridge girders and bracing elements, Tank shells and roofs, Machinery bases and press frames
Application industries: Construction and civil engineering (building frames, bridges, stadia), Offshore and marine (structural components, small platform members), Energy (transmission towers, pipe supports), Water and wastewater (low-pressure piping), Machinery and general engineering (frames, equipment supports)
EN 10025-2 S275JR Steel for LSAW Pipe Closely Related Substitute Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A283/A283M | Grade C | Similar strength (yield 205-220 MPa typical), lower impact guarantee; check tensile range |
| USA | ASTM A36/A36M | – | Yield ≥250 MPa, tensile 400-550 MPa; often accepted but no mandatory 20°C impact |
| Japan | JIS G3101 | SS400 | Yield ≥245 MPa, tensile 400-510 MPa; impact requirements not specified unless agreed |
| China | GB/T 700 | Q275B | Yield ≥275 MPa for t≤16mm, tensile 410-540 MPa, +20°C impact ≥27 J; slight P/S differences |
| International | ISO 630-2 | S275B | Comparable but may have minor differences in Si and N limits |
Notes:
- Weldability: S275JR is readily weldable with standard arc processes (SMAW, GMAW, SAW). For thick sections or low ambient temperatures, preheating may be advised (e.g., 50-100°C).
- Crack tip opening displacement (CTOD): Not guaranteed; for fracture-critical applications consider higher toughness grades like S275J0 or S275J2.
- Corrosion resistance: Not a weathering steel; surface protection (painting, galvanizing) is required for outdoor exposure.
- CEV typical: Carbon equivalent value ~0.35-0.40% depending on thickness, ensuring good weldability.
- LSAW pipe specifics: Pipe properties may differ from base plate due to cold forming and welding; supplementary testing per EN 10219 or EN 10210 may be required.
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