S355J2H SSAW Pipe: EN 10219 Structural Hollow Section
S355J2H SSAW Pipe: EN 10219 Structural Hollow Section - Composition, Properties & Equivalents
Complete technical data for S355J2H spiral submerged arc welded (SSAW) pipe according to EN 10219, covering chemical composition, mechanical & physical properties, equivalent grades, and application guidance.
Cold forming, welding, cutting, drilling, bending, machining, galvanizing
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S355J2H SSAW Pipe: EN 10219 Structural Hollow Section Introduction
S355J2H is a fine-grain structural steel grade standardized in EN 10219-1 for cold-formed welded hollow sections. Delivered as spiral submerged arc welded (SSAW) pipes, it offers a minimum yield strength of 355 MPa (for thicknesses ≤ 16 mm) combined with excellent notch toughness down to -20°C (minimum 27 J impact energy). The material is widely used in demanding structural applications where high strength, good weldability, and reliable low-temperature performance are required. Its balanced chemical composition ensures fine-grain practice and good formability during cold bending and further processing.
S355J2H SSAW Pipe: EN 10219 Structural Hollow Section Chemical Composition
The chemical composition is in accordance with EN 10219-1, Table 2. The steel is fully killed and fine-grain treated. Aluminum, niobium and vanadium are used singly or in combination to ensure a fine-grain microstructure. The carbon equivalent value (CEV) is limited to guarantee good weldability.
| Element | Standard Value (max or min) | Remarks |
|---|---|---|
| C | ≤ 0.22 | Maximum |
| Si | ≤ 0.55 | Maximum |
| Mn | ≤ 1.60 | Maximum |
| P | ≤ 0.035 | Maximum |
| S | ≤ 0.035 | Maximum |
| Nb | ≤ 0.05 | Maximum |
| V | ≤ 0.12 | Maximum |
| Al (total) | ≥ 0.020 | Minimum (grain refining element) |
| Cu | ≤ 0.55 | Maximum |
| N | ≤ 0.012 | Maximum |
| CEV | ≤ 0.45 | Carbon equivalent value |
S355J2H SSAW Pipe: EN 10219 Structural Hollow Section Thermal & Electrical Physical Properties
The following physical properties are typical values for S355 structural steel at room temperature and are not specified in EN 10219. They are provided for design and calculation purposes. Performance may vary slightly depending on exact composition and processing history.
| Property | Typical Value | Unit | Test 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 | – | Elastic range |
| Thermal expansion (α) | 11.1 × 10⁻⁶ | K⁻¹ | 20–100°C |
| Thermal expansion (α) | 12.3 × 10⁻⁶ | K⁻¹ | 20–200°C |
| Thermal conductivity (λ) | 53 | W/m·K | 20°C |
| Specific heat capacity | 470 | J/kg·K | 20°C |
| Electrical resistivity (ρₑ) | 0.16 × 10⁻⁶ | Ω·m | 20°C |
S355J2H SSAW Pipe: EN 10219 Structural Hollow Section Mechanical Properties
Mechanical properties are specified in EN 10219-1, Table 3 for longitudinal test pieces. Yield strength and tensile strength depend on wall thickness. Elongation is measured on a gauge length L₀ = 5.65√S₀. Impact energy is tested on Charpy-V notch specimens at -20°C.
| Property | Standard Requirement | Unit | Test Condition / Wall Thickness |
|---|---|---|---|
| Yield strength ReH | ≥ 355 | MPa | t ≤ 16 mm |
| Yield strength ReH | ≥ 345 | MPa | 16 < t ≤ 40 mm |
| Yield strength ReH | ≥ 335 | MPa | 40 < t ≤ 63 mm |
| Yield strength ReH | ≥ 325 | MPa | 63 < t ≤ 80 mm |
| Tensile strength Rm | 470 – 630 | MPa | t ≤ 63 mm |
| Tensile strength Rm | 470 – 630 | MPa | 63 < t ≤ 80 mm |
| Elongation A (longitudinal) | ≥ 22 | % | t ≤ 40 mm, L₀=5.65√S₀ |
| Elongation A (longitudinal) | ≥ 21 | % | 40 < t ≤ 65 mm |
| Impact energy KV (longitudinal) | ≥ 27 | J | -20°C |
| Bend test (180°) | d = 3t | – | Bend core diameter ratio |
S355J2H SSAW Pipe: EN 10219 Structural Hollow Section Full Equivalent Material Standards & Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10219-1 | S355J2H | Primary standard – cold-formed welded hollow section |
| European Union | EN 10210-1 | S355J2H | Hot-finished equivalent with similar chemistry and toughness |
| International | ISO 4951-2 | S355J2H | Identical designation under ISO standard |
S355J2H SSAW Pipe: EN 10219 Structural Hollow Section Application Introduction
S355J2H SSAW pipes are designed for demanding structural applications where high static and dynamic loads, weldability and low-temperature toughness are critical. The spiral welded form allows large diameters and long lengths, making it economical for pipelines and piling.
Product Applications: Building frames and columns, Road and pedestrian bridges, Offshore platform jackets and piles, Spiral welded ducting and penstocks, Crane booms and structural supports, Scaffolding and falsework, Street lighting poles and masts
Processed into products: Welded T-, K- and Y-joints, Base plates and flanges, Pile sleeves and connectors, Anchor cages for wind turbines, Bracing elements and truss chords, Cut-to-length pipe segments for machining, Galvanized hollow sections for street furniture
Application industries: Civil and structural engineering, Bridge construction, Offshore and marine structures, Wind energy (tower sections, transition pieces), Mechanical engineering, Transmission and communication towers, Mining and heavy machinery
S355J2H SSAW Pipe: EN 10219 Structural Hollow Section Similar / Alternative Material Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A572 | Grade 50 | Similar strength (345 MPa yield), no impact requirement |
| USA | ASTM A500 | Grade C | Hollow section with 345 MPa yield, no guaranteed impact |
| Japan | JIS G3466 | STKR490 | 325 MPa minimum yield, up to 490 MPa tensile, not fully matched low-temp toughness |
| China | GB/T 1591 | Q355D | Comparable yield & -20°C impact; differs in hollow section specification |
| Russia | GOST 27772 | C345 / S345 | Structural steel with yield around 345 MPa, limited impact data |
Notes:
- Impact test at -20°C is mandatory for S355J2H; alternatives S355J0H (0°C) and S355K2H (-20°C, higher toughness) are available.
- For welded connections, low-carbon equivalent (CEV ≤ 0.45) ensures good weldability without post-weld heat treatment in most cases.
- Dimensional and tolerances refer to EN 10219-2 for cold-formed welded structural hollow sections.
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