EN10025-2 S275J2 SSAW Pipe
EN10025-2 S275J2 SSAW Pipe: Non-Alloy Structural Steel for Welded Spiral Pipes
Detailed datasheet for S275J2 structural steel per EN10025-2, widely used in SSAW pipes with good weldability and low‑temperature toughness.
Welding (SAW, SMAW, GMAW), hot‑forming, cold‑bending, cutting, machining
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EN10025-2 S275J2 SSAW Pipe Introduction
S275J2 is a hot‑rolled non‑alloy structural steel grade defined in EN 10025‑2. It offers a minimum yield strength of 275 MPa for thickness ≤16 mm and guaranteed impact energy of 27 J at −20 °C (longitudinal direction). This steel is often processed into spiral submerged arc welded (SSAW) pipes for structural and pipeline applications. It provides excellent weldability, good ductility, and reliable toughness, making it suitable for demanding welded constructions. The material is typically delivered in as‑rolled, normalized rolled, or thermomechanically rolled condition.
EN10025-2 S275J2 SSAW Pipe Chemical composition
Values are maxima unless a range is indicated. The chemical requirements are in accordance with EN 10025‑2:2019, Table 1 for grade S275J2. Carbon equivalent (CEV) may be specified for weldability assessment.
| Element | Standard value (max % unless noted) | Remarks |
|---|---|---|
| Carbon (C) | 0.20 | Basis of strength, influences weldability |
| Manganese (Mn) | 1.50 | Deoxidiser and strength enhancer |
| Silicon (Si) | 0.55 | Deoxidiser; may be omitted for fine‑grain practice |
| Phosphorus (P) | 0.025 | Controlled for low‑temperature toughness |
| Sulfur (S) | 0.025 | Controlled for ductility and weld quality |
| Nitrogen (N) | 0.014 | Limited to avoid strain aging |
| Copper (Cu) | 0.55 | Optional; if specified, may be added to improve atmospheric corrosion resistance |
| Carbon Equivalent (CEV) | 0.42 (typical for thickness ≤40 mm) | Calculated as CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15; often limited in EN 10025‑2 for improved weldability |
EN10025-2 S275J2 SSAW Pipe Thermal and electrical physical properties
These physical constants are representative for non‑alloy structural steels similar to S275J2. Variations may occur due to exact composition and heat treatment. The values are suitable for engineering calculations such as thermal expansion, heat transfer, and electrical resistance.
| Property | Typical value | Unit | Test condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At room temperature |
| Young's modulus (E) | 210 | GPa | In tension, up to yield point |
| Shear modulus (G) | 81 | GPa | Calculated: E/(2(1+ν)) |
| Poisson's ratio (ν) | 0.3 | — | Elastic range |
| Thermal expansion coefficient (α) | 12 × 10⁻⁶ | K⁻¹ | Between 20 °C and 100 °C |
| Thermal conductivity (λ) | 50 – 54 | W/(m·K) | At 20 °C; decreases with increasing temperature |
| Specific heat capacity | 460 | J/(kg·K) | At 20 °C to 100 °C |
| Electrical resistivity (ρₑ) | 0.16 – 0.20 × 10⁻⁶ | Ω·m | At 20 °C |
EN10025-2 S275J2 SSAW Pipe Mechanical properties
Properties are based on EN 10025‑2 for S275J2 and apply to the base material before pipe forming. For SSAW pipes, the seam weld and heat‑affected zone shall also comply with relevant pipe standard (e.g., EN 10219 for cold‑formed welded structural hollow sections or API 5L for line pipe). Values below assume testing at ambient temperature unless stated otherwise.
| Property | Minimum value | Unit | Test condition / Remarks |
|---|---|---|---|
| Yield strength (ReH) | 275 | MPa | Thickness ≤ 16 mm; tensile test transverse to rolling direction |
| Yield strength (ReH) | 265 | MPa | Thickness > 16 mm ≤ 40 mm |
| Yield strength (ReH) | 255 | MPa | Thickness > 40 mm ≤ 63 mm |
| Tensile strength (Rm) | 410 – 560 | MPa | All thicknesses; typical range |
| Elongation after fracture (A) | ≥ 23 | % | Thickness ≤ 16 mm; gauge length L₀ = 5.65√S₀ |
| Elongation after fracture (A) | ≥ 22 | % | Thickness > 16 mm ≤ 40 mm |
| Elongation after fracture (A) | ≥ 21 | % | Thickness > 40 mm ≤ 63 mm |
| Impact energy (KV) | ≥ 27 (longitudinal) | J | Charpy‑V at −20 °C; 10×10 mm² specimen |
| Bend test (180°) | D = 1a (t ≤ 16 mm) | — | Bend diameter D, a = specimen thickness; no cracks outside middle third |
EN10025-2 S275J2 SSAW Pipe Fully equivalent material standards and replaceable grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025-2 | S275J2 | Original grade; widely adopted across CEN member states |
| International (ISO) | ISO 630-2 | S275J2 | ISO equivalent for hot‑rolled structural steels with identical chemical and mechanical requirements |
| Germany | DIN EN 10025-2 | S275J2 | DIN adoption of the EN standard; identical to EU specification |
| United Kingdom | BS EN 10025-2 | S275J2 | British adoption, fully harmonised with EN 10025-2 |
| France | NF EN 10025-2 | S275J2 | French adoption of the EN standard |
EN10025-2 S275J2 SSAW Pipe Application Introduction
The combination of good weldability, moderate strength, and low‑temperature toughness makes S275J2 an economical choice for SSAW pipes and structural hollow sections. It can be formed, welded, and galvanised without significant loss of properties. Typical applications are found in infrastructure and construction sectors.
Product Applications: Spiral submerged arc welded (SSAW) pipes, Longitudinal welded (LSAW) pipes, Welded structural hollow sections (square, rectangular, circular), Structural beams and columns in steel buildings, Pipe piles for foundation work
Processed into products: SSAW pipe used for water mains, drainage, and slurry transport, Pipe piles for bridge abutments and retaining walls, Structural bracing members in high‑rise buildings, Welded frameworks for material‑handling equipment, Support legs for offshore platforms (secondary structural parts)
Application industries: Civil engineering and construction, Oil and gas pipeline (low‑pressure fluid transport), Water and sewage conveyance, Offshore structural platforms (non‑critical members), Renewable energy structures (wind turbine towers, solar support frames), Shipbuilding and marine structures
EN10025-2 S275J2 SSAW Pipe Materials with similar mechanical properties
| Country / Region | Standard | Grade | Comparison notes |
|---|---|---|---|
| China | GB/T 700 | Q275D | Yield ≥275 MPa (≤16 mm), impact 27 J at −20 °C; similar concept but may differ in P/S limits and CEV control |
| United States | ASTM A36 | A36 | Yield ~250 MPa (lower than 275), no guaranteed low‑temperature impact; widely used structural steel |
| Japan | JIS G3101 | SS400 | Yield ~245 MPa, tensile comparable, but toughness not guaranteed at −20 °C; for less demanding applications |
| India | IS 2062 | E275 D | Yield min 275 MPa, impact at −20 °C; close to S275J2, may have slightly different Cu and microalloying limits |
Notes:
When S275J2 is used for SSAW pipe, the pipe manufacturing standard (e.g., EN 10219 for cold‑formed welded structural hollow sections or API 5L for line pipe) may impose additional requirements on weld metal quality, hydrostatic testing, and dimensional tolerances. The base material must still comply with EN 10025‑2.
For critical applications, supplementary requirements such as ultrasonic testing of plates, through‑thickness properties (Z‑quality), or restricted chemical compositions can be agreed with the steel supplier.
The material can be supplied with improved atmospheric corrosion resistance (weathering steel) by specifying higher Cu and Cr contents, but this falls outside the standard S275J2 grade and requires a separate EN 10025‑5 designation.
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