S275JR ERW Pipe
EN10025-2 S275JR ERW Pipe: Structural Steel for Welded Tubular Applications
Detailed material data for S275JR steel grade according to EN 10025-2, used in ERW pipes. Covers chemical composition, mechanical properties, thermal properties, international equivalents, and application guide.
ERW (electric resistance welding), cold forming, bending, welding, machining
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S275JR ERW Pipe Introduction
S275JR is a hot-rolled, non-alloy structural steel grade defined in EN 10025-2. It is widely used for welded, bolted, and riveted structures. The designation 'S275JR' indicates a minimum yield strength of 275 MPa for thicknesses ≤16 mm, and Charpy impact energy of 27 Joules at room temperature (JR). ERW (Electric Resistance Welded) pipes manufactured from S275JR strip or plate comply typically with standards like EN 10219 (cold-formed welded structural hollow sections) or EN 10217 (welded steel tubes for pressure purposes). The grade offers good weldability, moderate strength, and excellent formability, making it suitable for structural frameworks, machinery parts, and general fabrication.
S275JR ERW Pipe Chemical Composition
The chemical composition of S275JR is controlled to ensure good weldability and toughness. Maximum limits apply except for manganese, which has a range depending on product thickness. The values below are for long and flat products of thickness ≤150 mm, with more restrictive limits for certain thickness ranges (e.g., C ≤0.18% for t>30 mm).
| Element | Max/Min Value (%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.21 | For thickness ≤16 mm; ≤0.22 for ≤40 mm; ≤0.24 for >40 mm |
| Silicon (Si) | — | No specified limit, typically ≤0.55% deoxidation practice |
| Manganese (Mn) | ≤1.50 | For long products; ≤1.50 for flat products ≤40 mm; >40 mm may be 1.60 max |
| Phosphorus (P) | ≤0.035 | Ladle analysis |
| Sulfur (S) | ≤0.035 | Ladle analysis |
| Nitrogen (N) | ≤0.012 | If sufficient aluminum or other nitrogen binders present, otherwise ≤0.014 |
| Copper (Cu) | ≤0.60 | May be present as residual; <0.40 for certain applications |
| Others | — | Aluminum, chromium, nickel, molybdenum, etc. may be present as residuals, not specified |
S275JR ERW Pipe Typical Physical Properties
These values are typical for non-alloy structural steel and may vary slightly with exact composition and manufacturing. They are provided as reference for design calculations.
| Property | Typical Value | Unit | Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Elastic modulus (E) | 210 | GPa | 20°C |
| Shear modulus (G) | 81 | GPa | 20°C |
| Poisson's ratio (ν) | 0.3 | — | 20°C |
| Thermal expansion (α) | 12.0 × 10⁻⁶ | /°C | range 20–100°C |
| Thermal expansion (α) | 12.5 × 10⁻⁶ | /°C | range 20–200°C |
| Thermal expansion (α) | 13.2 × 10⁻⁶ | /°C | range 20–400°C |
| Thermal conductivity (λ) | 53.6 | W/(m·°C) | 20°C |
| Thermal conductivity (λ) | 51.0 | W/(m·°C) | 100°C |
| Thermal conductivity (λ) | 44.0 | W/(m·°C) | 400°C |
| Specific heat capacity | 461 | J/(kg·°C) | 20°C |
| Electrical resistivity (ρ_e) | 0.16–0.20 | µΩ·m | 20°C (typical for mild steel) |
S275JR ERW Pipe Mechanical Properties
Mechanical properties of S275JR depend on the thickness of the material. For ERW pipes formed from strip, the yield strength may be slightly increased by cold forming (refer to the relevant pipe standard). The values below are guaranteed minimums for the steel in the as-rolled condition. Tensile testing is performed in the transverse direction for flat products.
| Property | Standard Value | Unit | Test Condition / Thickness |
|---|---|---|---|
| Yield strength (ReH) | ≥275 | MPa | Thickness ≤16 mm |
| Yield strength (ReH) | ≥265 | MPa | 16 mm < thickness ≤ 40 mm |
| Yield strength (ReH) | ≥255 | MPa | 40 mm < thickness ≤ 63 mm |
| Yield strength (ReH) | ≥245 | MPa | 63 mm < thickness ≤ 80 mm |
| Yield strength (ReH) | ≥235 | MPa | 80 mm < thickness ≤ 100 mm |
| Tensile strength (Rm) | 410 – 560 | MPa | Thickness < 3 mm (longitudinal) |
| Tensile strength (Rm) | 410 – 560 | MPa | Thickness 3 – 100 mm (transverse) |
| Tensile strength (Rm) | 400 – 540 | MPa | Thickness 100 – 150 mm |
| Elongation (A) | ≥23 | % | Longitudinal, thickness ≤16 mm |
| Elongation (A) | ≥22 | % | Transverse, thickness ≤16 mm |
| Elongation (A) | ≥19 | % | Longitudinal, thickness 16–40 mm |
| Elongation (A) | ≥18 | % | Transverse, thickness 16–40 mm |
| Charpy impact (KV₂) (JR temperature) | ≥27 | J | At 20°C, longitudinal, thickness ≤150 mm |
| Bending test (mandrel diameter) | 2t for thickness ≤16 mm; 3t for >16mm | — | 180° bend to 0.5t (t = thickness) for ductility assessment |
S275JR ERW Pipe Exact Equivalent Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-2 | S275JR | Original grade, identical requirements |
| UK | BS 4360 (withdrawn) | 43B | Historical equivalent, replaced by S275JR |
| International | ISO 630-2 | S275B | Corresponds to S275JR, but impact test 27J at 20°C |
| China | GB/T 700-2006 | Q275B | Closest Chinese grade, yield 275 MPa, impact at 20°C |
| USA | ASTM A36/A36M | A36 | Similar yield 250 MPa, but S275JR is fully accepted as a substitute |
| Japan | JIS G3101 | SS400 | Yield 235–245 MPa typical, but often used interchangeably with S275JR |
S275JR ERW Pipe Application Introduction
S275JR ERW pipes are widely employed in structural and mechanical applications where moderate strength and good weldability are required. The ERW process creates a reliable weld seam suitable for static and dynamic loads. Typical applications include:
- Structural frameworks and steel buildings
- Automotive and machinery components
- Piping systems for water, gas, and low-pressure fluids
- Furniture and agricultural equipment
Product Applications: Structural hollow sections (circular, square, rectangular), Scaffolding tubes, Water well casing and pipelines, Fence posts and handrails, Chassis components for trailers and agricultural vehicles, Roller conveyor tubes
Processed into products: Welded beams and columns, Tubular steel trusses, Drill pipes (light duty), Bicycle frames (lower-end), Machinery guards and frames, Exhaust pipes (non-automotive, structural)
Application industries: Construction and civil engineering, Automotive manufacturing, Machinery and equipment fabrication, Agricultural machinery, Energy and pipeline (low pressure), Furniture industry
S275JR ERW Pipe Near Equivalent / Similar Substitute Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-2 | S235JR | Lower strength (yield 235 MPa), otherwise similar weldable structural steel |
| Europe | EN 10025-2 | S355JR | Higher strength (yield 355 MPa), for more demanding structural applications |
| Europe | EN 10025-2 | S275J0 | Impact toughness at 0°C instead of 20°C, for low-temperature service |
| USA | ASTM A572/A572M | Grade 50 | Higher strength (345 MPa) but similar carbon-manganese steel, may replace if strength is acceptable |
| India | IS 2062 | E250 B | Yield 250 MPa, close to S275JR, widely used in Indian constructions |
Notes:
ERW Pipe Considerations: The final mechanical properties of ERW pipes made from S275JR steel may vary due to cold forming effects (strain hardening) and the weld heat affected zone. Typically, the yield strength in the finished tube may be higher than the base strip, especially in corners of rectangular hollow sections. When ordering to EN 10219, the material may be dual-certified to EN 10025-2 and the pipe standard. Always confirm the applicable product standard and optional requirements (e.g., hot-dip galvanizing, normalizing) with the supplier.
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