S355J0H LSAW Pipe EN 10219
S355J0H LSAW Pipe EN 10219: Structural Steel Hollow Section Data & Properties
Complete material data for S355J0H cold-formed LSAW structural hollow sections per EN 10219. Chemical composition, mechanical & physical properties, equivalents, and application guide.
Cold forming from hot‑rolled coil/plate followed by longitudinal submerged arc welding; possible post‑weld heat treatment (normalizing); machining, drilling, cutting
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S355J0H LSAW Pipe EN 10219 Introduction
S355J0H is a structural steel grade defined in EN 10219, specifically for cold‑formed welded structural hollow sections. It provides a minimum yield strength of 355 MPa and guaranteed impact toughness at 0°C (designated by J0). The LSAW (Longitudinal Submerged Arc Welded) manufacturing process enables large‑diameter, thick‑walled pipes with excellent dimensional accuracy.
Typical chemical composition relies on low carbon, medium manganese, and optional micro‑alloying elements (Nb, V, Ti) to achieve a fine‑grain structure, ensuring good weldability, strength, and ductility. The steel is supplied in the as‑welded or normalized condition, meeting strict requirements for structural applications.
Key features:
- Minimum yield strength 355 MPa (thickness ≤ 16 mm)
- Impact energy ≥27 J at 0°C
- Suitable for all conventional welding methods
- Good formability and consistent mechanical properties
- Widely used in construction, bridges, offshore, and piling
S355J0H LSAW Pipe EN 10219 Chemical composition
Chemical limits according to EN 10219-1, cast analysis. Fine‑grain practice is required for J0 quality, typically ensured by aluminium addition (Altotal ≥ 0.020%) and optional micro‑alloying. Low phosphorus and sulfur enhance weldability and toughness.
| Element | Standard value (%) | Remarks |
|---|---|---|
| C | ≤ 0.22 | Maximum |
| Si | ≤ 0.55 | Maximum |
| Mn | ≤ 1.60 | Maximum |
| P | ≤ 0.035 | Maximum |
| S | ≤ 0.035 | Maximum |
| N | ≤ 0.020 | Maximum (nitrogen bound by Al) |
| Al total | ≥ 0.020 | Minimum for fine‑grain practice |
| Nb | ≤ 0.05 | Optional micro‑alloying, if added |
| V | ≤ 0.12 | Optional micro‑alloying, if added |
| Ti | ≤ 0.05 | Optional micro‑alloying, if added |
| Cr | ≤ 0.30 | Residual/optional; not explicitly limited but kept low for weldability |
| Ni | ≤ 0.30 | Residual/optional |
| Mo | ≤ 0.10 | Residual/optional |
| Cu | ≤ 0.55 | Residual/optional |
| CEV | ≤ 0.45 | Carbon equivalent (typical max, based on CE = C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15) |
S355J0H LSAW Pipe EN 10219 Thermal and electrical physical properties
Typical physical properties for structural steel S355 series at room temperature (20°C) unless noted. These values are not mandated by EN 10219 but are representative for engineering design.
| Property | Typical value | Unit | Test conditions |
|---|---|---|---|
| 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 | – | At 20°C |
| Thermal expansion (α) | 12.0 × 10⁻⁶ | K⁻¹ | 20°C – 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) | 0.15 × 10⁻⁶ | Ω·m | At 20°C |
S355J0H LSAW Pipe EN 10219 Mechanical properties
Properties determined on test pieces taken from finished hollow sections, longitudinal direction, as per EN 10219-1. Values depend on wall thickness. The bending test uses a mandrel diameter of 2t (where t = wall thickness) for J0 grades.
| Property | Standard required value | Unit | Test conditions |
|---|---|---|---|
| Yield strength (ReH) | 355 | MPa | Wall thickness ≤ 16 mm |
| Yield strength (ReH) | 345 | MPa | Wall thickness > 16 mm ≤ 40 mm |
| Tensile strength (Rm) | 470 – 630 | MPa | All thicknesses |
| Elongation (A5) | 22 | % | Longitudinal, thickness ≤ 40 mm |
| Elongation (A5) | 20 | % | Transverse, thickness ≤ 40 mm (if required) |
| Charpy impact (KV₂) | 27 | J | At 0°C, longitudinal, thickness ≥ 6 mm |
| Bending test | Mandrel diameter = 2t | – | 180° bend, no cracks (J0 grades) |
S355J0H LSAW Pipe EN 10219 Fully equivalent material standards and replaceable grade designations
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10219-1 | S355J0H | Original cold‑formed hollow section grade |
| European Union | EN 10210-1 | S355J0H | Hot‑finished hollow section – equivalent mechanicals, same chemistry philosophy |
| India | IS 4923 | YSt 355 | Cold‑formed hollow sections; full equivalence when impact test at 0°C is agreed and performed |
| United Kingdom | BS EN 10219-1 | S355J0H | UK adoption of European standard |
| Germany | DIN EN 10219-1 | S355J0H | German adoption of European standard |
| France | NF EN 10219-1 | S355J0H | French adoption of European standard |
S355J0H LSAW Pipe EN 10219 Application Introduction
S355J0H LSAW pipes excel in large‑scale structural and civil engineering projects where high load‑bearing capacity, reliable toughness, and good weldability are essential. Their combination of strength (355 MPa yield) and 0°C impact toughness makes them suitable for temperate climates and moderate dynamic loading.
Product Applications: Structural hollow section columns and beams, Bridge piers and cross‑bracing members, Tubular piles for deep foundations, Offshore jacket and topside primary members, Wind turbine tower flanges and access tubes, Heavy lifting and transport equipment frames
Processed into products: Column sections (built‑up and single), Truss chord members, Diagonal bracing struts, Pile casings and connectors, K‑joints and node plates in tubular structures, Bent pipe segments for curved architectural features, Load‑bearing telescopic booms
Application industries: Construction & civil engineering (high‑rise buildings, stadiums, airports), Bridge engineering (piers, arch ribs, trusses), Offshore & marine structures (jacket legs, topside modules, wind turbine transition pieces), Piling & foundation engineering (bearing piles, combination walls), Mechanical & heavy equipment (crane booms, conveyor galleries, agricultural machinery), Energy sector (low‑pressure LSAW line pipe, structural supports for pipelines)
S355J0H LSAW Pipe EN 10219 Similar / alternative materials
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10219-1 | S355J2H | Higher toughness (–20°C), otherwise identical strength and composition; suitable for colder environments |
| European Union | EN 10025-2 | S355J0 | Plate/section grade, no hollow shape; often used as raw material for welded hollow sections |
| USA | ASTM A572/A572M | Grade 50 | Yield 345 MPa min; not specifically for hollow sections; comparable strength, lower impact guarantee |
| USA | ASTM A500 | Grade C | Cold‑formed hollow sections, yield 345 MPa min; lower strength but widely used structural tubing |
| Japan | JIS G 3106 | SM490A | Weldable structural steel, yield ~325‑365 MPa depending on thickness; similar application range |
| China | GB/T 1591 | Q355D | H‑shaped/sections, yield 355 MPa, –20°C impact; chemical composition differs slightly; often used in welded structures |
Notes:
LSAW process note: Longitudinal Submerged Arc Welded pipes are manufactured from hot‑rolled steel plates, formed into a cylindrical shape, and welded using an automatic submerged arc process. This results in a high‑integrity weld that is typically inspected by UT or RT. Diameter range is typically 16″ (406 mm) to over 64″ (1625 mm), with wall thickness from 6 mm up to 60 mm.
Weldability: S355J0H can be welded by all common methods (SMAW, GMAW, SAW, FCAW) with low hydrogen practice recommended. Pre‑heat is not usually required for thinner sections (<40 mm) but may be applied according to CEV and section thickness.
Corrosion protection: As‑delivered condition includes a temporary shop primer; outdoor exposure requires additional coating systems (painting, hot‑dip galvanizing, or metallization). Hollow sections can also be internally protected if required.
Testing & certification: En 10219‑1 mandates tensile, impact, and dimensional tests. Supplementary tests (e.g., through‑thickness tensile, HIC, NACE) are available by agreement. CE marking can be supplied when requested.
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