EN 10219 S355NH ERW Pipe
EN 10219 S355NH ERW Pipe: Chemical, Mechanical & Physical Data
Detailed material data for S355NH cold-formed welded structural hollow sections per EN 10219, including chemical composition, mechanical properties, physical properties, international equivalents, and application guidance.
Cold forming, electric resistance welding (ERW), cutting, bending, machining, welding
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EN 10219 S355NH ERW Pipe Introduction
S355NH is a fine-grain structural steel grade specified in EN 10219-1 for cold-formed welded structural hollow sections. The designation 'S355' indicates a minimum yield strength of 355 MPa, 'N' denotes normalized or normalized rolled delivery condition for the base material, and 'H' stands for hollow section. Typically supplied as ERW (Electric Resistance Welded) pipes, this material offers good weldability, excellent toughness at low temperatures, and reliable mechanical properties, making it ideal for demanding structural applications. Its fine-grain structure ensures uniform mechanical behavior, while the cold-forming process allows production of a wide range of shapes and sizes with tight dimensional tolerances.
EN 10219 S355NH ERW Pipe Chemical Composition
Chemical requirements for S355NH according to EN 10219-1:2006. Values are maximum unless otherwise indicated.
- Aluminum is specified as total aluminum (Altot).
- Carbon equivalent (CEV) is typically limited to improve weldability.
- Fine grain practice is ensured by the minimum aluminum content or other grain-refining elements.
| Chemical Element | Standard Value (wt.%) | Remarks |
|---|---|---|
| Carbon (C) | 0.20 max | |
| Silicon (Si) | 0.50 max | |
| Manganese (Mn) | 1.65 max | |
| Phosphorus (P) | 0.030 max | |
| Sulfur (S) | 0.025 max | |
| Niobium (Nb) | 0.05 max | |
| Vanadium (V) | 0.12 max | |
| Aluminum (Altot) | 0.020 min | Total aluminum |
| Titanium (Ti) | 0.05 max | |
| Chromium (Cr) | 0.30 max | |
| Nickel (Ni) | 0.50 max | |
| Molybdenum (Mo) | 0.10 max | |
| Copper (Cu) | 0.55 max | |
| Nitrogen (N) | 0.015 max | |
| CEV | 0.43 typical max | For thicknesses ≤ 16 mm; higher values may apply for thicker sections |
EN 10219 S355NH ERW Pipe Thermal and Electrical Physical Properties
Typical room-temperature physical properties for S355NH steel. These values are not part of the EN 10219 standard and are provided as engineering reference data.
- Density is assumed constant for all practical purposes.
- Thermal expansion coefficient is an average for the range 20–100 °C.
- Elastic and shear moduli are representative for carbon-manganese structural steels.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | At 20 °C |
| Elastic Modulus (E) | 210 | GPa | At 20 °C |
| Shear Modulus (G) | 81 | GPa | At 20 °C |
| Poisson's Ratio (ν) | 0.3 | - | |
| Thermal Expansion (α) | 12 × 10⁻⁶ | K⁻¹ | 20–100 °C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | At 20 °C |
| Specific Heat Capacity (c) | 460 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρₑ) | 0.25 × 10⁻⁶ | Ω·m | At 20 °C |
EN 10219 S355NH ERW Pipe Mechanical Properties
Mechanical properties of S355NH hollow sections as per EN 10219-1. The values are valid for longitudinal direction and for wall thicknesses ≤ 16 mm unless stated otherwise.
- Yield and tensile requirements are mandatory for the finished product.
- Impact energy is measured at -20 °C on Charpy-V specimens; minimum average (longitudinal) is 27 J.
- Elongation is based on a gauge length of 5.65√S₀.
| Property | Specified Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | 355 min | MPa | Wall thickness ≤ 16 mm |
| Yield Strength (ReH) | 345 min | MPa | Wall thickness > 16 mm and ≤ 40 mm |
| Tensile Strength (Rm) | 470 - 630 | MPa | All thicknesses |
| Elongation (A) | 22 min | % | Longitudinal, wall thickness ≤ 40 mm |
| Impact Energy (KV₂) | 27 min | J | At -20 °C, longitudinal, average of three tests |
| Bendability | No cracks | - | Flattening or drift expanding test per standard |
EN 10219 S355NH ERW Pipe Full Equivalent Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10219-1 | S355NH | Cold-formed welded hollow sections; the direct designation; also accepted under national adoptions (BS, DIN, NF, UNE, etc.) |
EN 10219 S355NH ERW Pipe Application Introduction
S355NH hollow sections are widely used in load-bearing structures where high strength, good weldability, and toughness at low temperatures are required. The ERW pipe form offers cost efficiency and tight tolerances for both static and dynamic loading conditions.
Product Applications: Structural framework for commercial and industrial buildings, Bridge girders and trusses, Offshore platform braces and legs, Crane booms and lattice structures, Roll-over protective structures (ROPS), Sign gantries and lighting poles, Conveyor frames and material handling systems
Processed into products: Hollow section columns, beams, and braces, Welded connections and nodes, End plates and base plates, Spliced and bolted joints, Pipe-in-pipe systems for oil and gas, Manipulator arms and robotic structures
Application industries: Civil and structural engineering, Bridge construction, Offshore and marine structures, Heavy machinery and crane building, Wind turbine towers and support structures, Vehicle frames and chassis, Agricultural and earthmoving equipment
EN 10219 S355NH ERW Pipe Similar / Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10210-1 | S355NH | Hot-finished hollow sections; identical strength class but different manufacturing route; may substitute in many structural applications with design adjustment. |
| USA | ASTM A500/A500M | Grade C | Cold-formed welded hollow sections; yield strength 345 MPa, tensile 425 MPa; no impact requirement; suitable for similar structural uses in non-critical toughness applications. |
| Japan | JIS G 3466 | STKR490 | Carbon steel square and rectangular hollow sections; minimum yield 325 MPa, tensile 490–610 MPa; no impact requirement; approximate alternative. |
Notes:
Weldability: S355NH exhibits excellent weldability with all common processes (SMAW, GMAW, SAW, etc.). Preheating may be required for very thick sections or low ambient temperatures. Corrosion Protection: As an unalloyed steel, surface protection (galvanizing, painting, or coating) is recommended for outdoor or corrosive environments. CEV: Carbon equivalent values are controlled to ensure good weldability; typical CEV ≤ 0.43 for thickness ≤ 16 mm. Testing: In addition to standard tensile and impact tests, production tests often include flattening, drift expansion, and nondestructive testing (UT, eddy current) to verify weld integrity.
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