EN10025-2 S355JR SSAW Pipe
EN10025-2 S355JR SSAW Pipe: Structural Steel Grade for Spiral Welded Pipes
Full material analysis for S355JR steel grade used in SSAW pipes per EN10025-2, including chemical composition, mechanical properties, thermal and electrical physical data, and international equivalent grades.
Hot rolling, normalizing (optional), spiral submerged arc welding (SSAW).
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
EN10025-2 S355JR SSAW Pipe Introduction
S355JR is a low carbon, high strength structural steel defined in EN 10025-2. It is widely used as the base material for SSAW (Spiral Submerged Arc Welded) pipes due to its excellent weldability, good toughness, and guaranteed minimum yield strength of 355 MPa. The 'JR' suffix indicates that the steel is supplied with impact properties verified at +20°C (27 Joules minimum). This grade offers a favorable combination of strength, formability, and cost-effectiveness, making it suitable for pipelines, structural columns, piling, and general engineering applications. It is typically delivered in the as-rolled or normalized condition, with strict control over carbon equivalent to ensure reliable field welding.
EN10025-2 S355JR SSAW Pipe Chemical Composition
The chemical composition of S355JR according to EN 10025-2: 2004/2019 for product thicknesses ≤ 40 mm, which covers the typical range for SSAW pipe base plates. Phosphorus and sulfur are strictly controlled to ensure proper weldability and toughness. The carbon equivalent value (CEV) is also limited to guarantee good field weldability.
| Element | Standard Value | Remarks |
|---|---|---|
| C | ≤ 0.24 | Max for t ≤ 40 mm |
| Si | ≤ 0.55 | |
| Mn | ≤ 1.60 | |
| P | ≤ 0.035 | |
| S | ≤ 0.035 | |
| Cu | ≤ 0.55 | |
| N | ≤ 0.012 | For long products, N ≤ 0.014 if sufficient Al is present |
| CEV | ≤ 0.45 | Typical for thickness ≤ 30 mm; CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 |
EN10025-2 S355JR SSAW Pipe Thermal and Electrical Physical Properties
The following physical properties are typical for carbon-manganese structural steels of the S355JR type at room temperature. They are not specified in EN 10025-2 but are widely accepted for engineering calculations. Actual values may vary slightly depending on thermal history and exact composition.
| Property | Typical Value | Unit | Condition |
|---|---|---|---|
| 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 coefficient (α) | 12 × 10⁻⁶ | 1/K | 20–100°C |
| Thermal conductivity (λ) | 50 | W/(m·K) | 20°C |
| Specific heat capacity (c) | 460 | J/(kg·K) | 20°C |
| Electrical resistivity (ρ_e) | 0.15–0.25 | µΩ·m | 20°C |
EN10025-2 S355JR SSAW Pipe Mechanical Properties
Minimum specified mechanical properties of S355JR flat products used for SSAW pipe, as per EN 10025-2. Values depend on nominal thickness. The impact test is performed on longitudinal Charpy V-notch specimens at +20°C with a minimum absorbed energy of 27 J. Bend test requirements ensure cold formability without cracking.
| Property | Standard Requirement | Unit | Test Condition / Thickness |
|---|---|---|---|
| Yield strength (ReH) | ≥ 355 | MPa | t ≤ 16 mm |
| Yield strength (ReH) | ≥ 345 | MPa | 16 < t ≤ 40 mm |
| Yield strength (ReH) | ≥ 325 | MPa | 40 < t ≤ 63 mm (reference) |
| Tensile strength (Rm) | 470 – 630 | MPa | t ≤ 100 mm |
| Elongation (A) | ≥ 22 | % | Longitudinal, L₀ = 5.65√S₀, t ≤ 40 mm |
| Elongation (A) | ≥ 21 | % | Transverse, t ≤ 40 mm |
| Impact energy (KV) | ≥ 27 | J | Longitudinal, +20°C |
| Bend test | No cracks | – | Mandrel diameter: 2t for t ≤ 16 mm; 3t for 16 < t ≤ 40 mm, 180° bend |
EN10025-2 S355JR SSAW Pipe Fully Equivalent Material Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025-2 | S355JR | Original specification |
| International | ISO 630-2 | S355JR | Identical technical content |
| Germany | DIN EN 10025-2 | S355JR | Adopts EN standard |
| United Kingdom | BS EN 10025-2 | S355JR | Adopts EN standard |
| France | NF EN 10025-2 | S355JR | Adopts EN standard |
EN10025-2 S355JR SSAW Pipe Application Introduction
S355JR in SSAW pipe form is extensively used where medium- to large-diameter pipes are needed for fluid transport or structural support. Its balanced properties allow efficient spiral welding and good service performance under static and dynamic loads. Typical applications include:
Product Applications: Spiral submerged arc welded (SSAW) pipes, Line pipes (oil, gas, water), Structural pipe columns and hollow sections, Pipe foundation piles and casing pipes, Penstocks and water mains, Wind turbine tower sections (when formed into large pipes)
Processed into products: Pipeline segments for cross-country oil/gas networks, Steel pipe piles for bridge piers, quay walls, and retaining structures, Spiral welded columns for industrial buildings and sports facilities, Flanges, tees, and reducers for piping systems, Rollers and idlers for conveyor systems, Hydraulic cylinder shells (after machining from thick plate), Support structures for offshore wind platforms
Application industries: Oil and gas transmission, Water supply and wastewater engineering, Construction and civil engineering, Piling and deep foundations, Mining and slurry pipelines, Offshore and marine structures, Mechanical engineering and equipment manufacturing
EN10025-2 S355JR SSAW Pipe Similar/Comparable Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 1591 | Q355B | Min. yield 355 MPa, longitudinal impact at 0°C (34J); closely comparable, often used as substitute for S355JR pipe. |
| USA | ASTM A572/A572M | Grade 50 (Type 1) | Yield 345 MPa (50 ksi). Lower yield than S355JR; may require design adjustment. Similar weldability and toughness at 20°C. |
| Japan | JIS G3106 | SM490B | Yield 325 MPa (SM490B); impact at 0°C. Slightly lower strength; not a direct match but applicable for some structural pipes. |
| India | IS 2062 | E350 BR | Yield 350 MPa; impact at +27°C; close alternative for S355JR in non-critical applications. |
| Russia | GOST 27772 | S355JR (direct adoption) | Direct equivalent; same designation used in national annex. |
Notes:
When SSAW pipes are manufactured to pipeline standards such as API 5L PSL1/PSL2, the base material may still be supplied as S355JR per EN 10025-2, but additional requirements (hydrostatic test, NDT, toughness at lower temperatures) apply. Dimensional tolerances for the finished pipe are governed by standards like EN 10219 (cold-formed welded structural hollow sections) or ASTM A252 (welded and seamless steel pipe piles). For sour service or low-temperature applications, a restricted chemical composition (e.g., lower CEV, S ≤ 0.003%) is often specified. Always refer to the project specification and the applicable pipe standard.
- Share
