EN10219 S275NH SSAW Pipe
EN10219 S275NH SSAW Pipe: High-Strength Normalized Structural Hollow Section
Comprehensive material data for S275NH spiral submerged arc welded (SSAW) pipe under EN10219 standard, including chemical composition, mechanical and thermal properties, international equivalents, and application guidance.
Hot rolled strip, cold forming, spiral welding, post-weld normalizing heat treatment
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EN10219 S275NH SSAW Pipe Introduction
S275NH is a normalized/normalized rolled weldable fine-grain structural steel grade specified in EN 10219-1 for cold-formed welded structural hollow sections. The 'N' designation guarantees improved toughness at -20°C compared to standard S275 grades. Delivered primarily as SSAW (spiral submerged arc welded) pipes, it offers a minimum yield strength of 275 MPa (wall thickness ≤16 mm), good elongation and impact properties. Typical applications include load-bearing structures, bridges, offshore platforms, and piling works, where reliable low-temperature performance and uniform mechanical properties are essential. The normalizing treatment refines the grain structure, enhances ductility and ensures consistent strength throughout the wall thickness.
EN10219 S275NH SSAW Pipe Chemical Composition
Chemical composition limits according to EN 10219-1:2006 for S275NH. Fine grain practice is ensured by sufficient aluminum content and/or additions of niobium, vanadium or titanium. The low carbon equivalent (CEV ≤0.40) guarantees excellent weldability without preheating in typical thicknesses.
| Chemical element | Value (mass %) | Remarks |
|---|---|---|
| C | ≤0.20 | ladle analysis |
| Si | ≤0.55 | ladle analysis |
| Mn | ≤1.50 | ladle analysis |
| P | ≤0.030 | ladle analysis |
| S | ≤0.025 | ladle analysis |
| Nb | ≤0.05 | ladle analysis |
| V | ≤0.05 | ladle analysis |
| Altotal | ≥0.020 | acid soluble or total aluminum |
| Ti | ≤0.05 | ladle analysis |
| Cr | ≤0.30 | ladle analysis |
| Ni | ≤0.30 | ladle analysis |
| Mo | ≤0.10 | ladle analysis |
| Cu | ≤0.35 | ladle analysis |
| N | ≤0.015 | ladle analysis |
| CEV | ≤0.40 | carbon equivalent value, based on ladle formula |
EN10219 S275NH SSAW Pipe Thermal and Electrical Physical Properties
Physical properties are representative for normalized non-alloy structural steel at room temperature unless otherwise stated. These values apply to the base material of S275NH and are suitable for engineering calculations (heat transfer, elastic deformation).
| Property | Typical value | Unit | Test condition |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | 20 °C |
| Modulus of elasticity (E) | 210 | GPa | 20 °C |
| Shear modulus (G) | 81 | GPa | 20 °C |
| Poisson's ratio (ν) | 0.3 | - | 20 °C |
| Thermal expansion coefficient (α) | 12.0 | ×10⁻⁶ /K | 20 – 100 °C |
| Thermal conductivity (λ) | 50 | W/(m·K) | 20 °C |
| Specific heat capacity (c) | 470 | J/(kg·K) | 20 °C |
| Electrical resistivity (ρe) | 0.20 | ×10⁻⁶ Ω·m | 20 °C |
EN10219 S275NH SSAW Pipe Mechanical Properties
Mechanical properties as required by EN 10219-1 for finished normalized structural hollow sections. The values depend on the wall thickness (t). Tensile test specimens are taken from the base material; impact specimens are longitudinal. Bending test requirements confirm ductility after cold forming and normalizing.
| Property | Required value | Unit | Test condition / wall thickness |
|---|---|---|---|
| Yield strength (ReH) | ≥275 | MPa | t ≤ 16 mm |
| Yield strength (ReH) | ≥265 | MPa | 16 < t ≤ 40 mm |
| Yield strength (ReH) | ≥255 | MPa | 40 < t ≤ 65 mm |
| Yield strength (ReH) | ≥245 | MPa | 65 < t ≤ 80 mm |
| Yield strength (ReH) | ≥235 | MPa | 80 < t ≤ 100 mm |
| Tensile strength (Rm) | 370 – 510 | MPa | all t |
| Elongation (A) | ≥17 | % | t ≤ 3 mm, L0=5.65√S0 |
| Elongation (A) | ≥22 | % | 3 < t ≤ 40 mm |
| Elongation (A) | ≥21 | % | 40 < t ≤ 65 mm |
| Elongation (A) | ≥20 | % | 65 < t ≤ 100 mm |
| Impact energy (KV2) at -20°C | ≥40 | J | t ≤ 60 mm, longitudinal |
| Impact energy (KV2) at -20°C | ≥27 | J | 60 < t ≤ 100 mm, longitudinal |
| Bending test (mandrel diameter) | d = 2a | - | 180°, t ≤ 16 mm (typical) |
EN10219 S275NH SSAW Pipe Fully Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10210-1 | S275NH | Hot-finished hollow section, identical base material and delivery condition |
| Europe | EN 10025-3 | S275N | Normalized fine grain structural steel plate; same chemistry and mechanical properties, but flat product |
| Germany | DIN 17119 | StE 285 | Historically equivalent, now withdrawn |
| China | GB/T 1591-2018 | Q275D | Normalizing optional; comparable strength and -20°C impact (-20°C), but chemical composition requirements differ slightly |
| USA | ASTM A572/A572M | Grade 50 | Higher yield (345 MPa), not exact equivalent; acceptable for many welded structural applications if strength is compatible |
| Japan | JIS G3106 | SM490A | Higher strength (min. 325 MPa yield), not fully equivalent; weldability and toughness comparable |
EN10219 S275NH SSAW Pipe Application Introduction
S275NH SSAW pipes are extensively utilized in load-bearing constructions that demand reliable toughness at sub-zero temperatures and consistent mechanical performance. The normalized condition ensures uniform properties through the wall, making the pipes suitable for static, dynamic and fatigue-loaded structures. Common application areas include:
Product Applications: Structural columns and beams, Piling pipes for deep foundations, Trusses and lattice towers, Roller coaster and amusement ride support structures, Wind turbine tower secondary elements, Process and service piping
Processed into products: Spiral welded pipe segments for main structural members, Flanged pipe spools for connections, Welded tubular joints and nodes, Pile connectors and reinforcement rings, Gusset plates fabricated from the parent strip, Bracing elements in steel frameworks
Application industries: Construction and civil engineering, Bridge building, Offshore and marine structures, Mechanical engineering, Piling and foundation works, Pressure pipelines (non-sour service)
EN10219 S275NH SSAW Pipe Similar / Nearby Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10219-1 | S275J2H | Same yield strength, impact at 0°C instead of -20°C; non-normalized, more common for general structural use |
| Europe | EN 10219-1 | S275MLH | Thermomechanically rolled; same strength and -20°C impact, but different production route |
| Europe | EN 10219-1 | S355NH | Higher strength (yield ≥355 MPa) normalized hollow section for more demanding loads |
| Europe | EN 10210-1 | S275J2H | Hot-finished hollow section, 0°C impact, non-normalized, suitable where normalizing is not required |
| USA | ASTM A500 | Grade C | Cold-formed hollow section, yield 345 MPa, no impact requirement; characteristic strength differs |
Notes:
Additional information: Material supplied according to EN 10219 generally comes with an inspection certificate 3.1 per EN 10204. Normalizing may be performed either on the entire finished pipe or on the hot-rolled strip before forming; the specific route shall be agreed upon at the time of enquiry and order. For applications requiring improved through-thickness properties, additional Z-quality requirements (e.g., Z15, Z25) can be specified based on EN 10164.
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