S355J0 Pipes and Tubes
S355J0 occupies a precise and deliberate position in the S355 sub-grade family — above the ambient-temperature JR grade and below the cold-climate J2 grade — making it the rational choice for structural hollow sections in projects where operating temperatures reach 0 °C but the premium of −20 °C impact testing is not warranted by the design conditions.
Produced to EN 10025-2, the J0 designation confirms Charpy V-notch impact testing at 0 °C with a minimum absorbed energy of 27 J. For the significant volume of European and international structural projects located in temperate climates — where winter site and service temperatures regularly approach but do not fall significantly below freezing — S355J0 pipes and tubes provide the toughness assurance engineers need without the tighter chemistry and higher material cost associated with J2 sub-grade hollow sections.
Mechanical Properties
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 470 – 630 | MPa |
| Yield Strength (min., t ≤ 16 mm) | 355 | MPa |
| Yield Strength (min., 16–40 mm) | 345 | MPa |
| Yield Strength (min., 40–63 mm) | 335 | MPa |
| Elongation (min.) | 22 | % |
| Charpy Impact at 0 °C (min.) | 27 | J |
| Brinell Hardness | 152 – 187 | HB |
| Density | 7.85 | g/cm³ |
| Modulus of Elasticity | 210 | GPa |
Chemical Composition
| Element | Max. Content (%) |
|---|---|
| Carbon (C) | 0.22 |
| Silicon (Si) | 0.55 |
| Manganese (Mn) | 1.60 |
| Phosphorus (P) | 0.030 |
| Sulfur (S) | 0.030 |
| Nitrogen (N) | 0.012 |
| Carbon Equivalent (CE) | 0.43 max |
S355 Sub-Grade Positioning
| Sub-Grade | Impact Test Temp. | Charpy Energy | Select When |
|---|---|---|---|
| S355JR | +20 °C | 27 J min. | Warm or temperate climate, non-dynamic |
| S355J0 | 0 °C | 27 J min. | Temperate to mild cold, standard European projects |
| S355J2 | −20 °C | 27 J min. | Cold climate, dynamic or crane applications |
| S355K2 | −20 °C | 40 J min. | Fatigue-critical or high-dynamic structures |
S355J0 is the optimal sub-grade when the project’s minimum service or construction temperature reaches 0 °C but does not fall to −20 °C — avoiding the over-specification cost of J2 without the under-specification risk of JR.
Product Types & Manufacturing Routes
- Seamless Pipes & Tubes (EN 10210-1): Hot-pierced and rolled without a weld seam for uniform wall thickness, superior fatigue resistance, and consistent pressure performance. Preferred for structural columns, pile casings, and mechanically loaded tubular members.
- Hot-Finished Hollow Sections — SHS / RHS / CHS (EN 10210-1): Hot-formed from welded tube, relieving cold-forming residual stresses and producing consistent through-wall mechanical properties. The standard specification for primary structural hollow sections in EN 1993-compliant designs.
- Cold-Formed Welded Hollow Sections (EN 10219-1): Square, rectangular, and circular hollow sections cold-formed from S355J0 coil. More economical than hot-finished and suitable for secondary structural members, portal frame rafters, and general fabrication work.
- ERW Pipes (EN 10217-1): Electric resistance welded structural pipes for fluid-conveying and structural applications where seamless specification is not required.
Applications
- Structural Building Frames: Hot-finished SHS and RHS columns and beams in multi-storey industrial and commercial buildings in temperate European climates where 0 °C site toughness is the design requirement and J2 would be over-specification.
- Bridge & Infrastructure Tubulars: CHS arch ribs, hangers, and bracing members in road and pedestrian bridges where EN 1993-1-1 structural codes and 0 °C toughness govern hollow section selection.
- Industrial Plant Frameworks: Pipe rack columns, equipment support frames, and module structural hollow sections in petrochemical and power plants in moderate-climate locations.
- Port & Harbour Structures: Structural tubular members in port cranes, ship loaders, and quayside equipment frames where coastal temperate climates make 0 °C the governing impact temperature.
- Transmission & Telecoms Towers: Hollow section legs, braces, and cross-arm tubes for electrical transmission towers and telecoms masts in temperate European and Asian locations.
- Agricultural & Storage Structures: Primary frame tubes for large-span agricultural buildings, grain storage facilities, and industrial sheds where structural codes require impact-tested hollow sections.
Weldability & Processing
S355J0 pipe and tube welds reliably using SMAW, GMAW, FCAW, SAW, and GTAW processes. The CE of up to 0.43 is within the good weldability range, and standard shop welding practices apply for wall thicknesses below 25 mm at ambient temperature. For walls above 25 mm, a preheat of 75–100 °C is recommended.
Welding consumables should carry a specified impact classification at 0 °C or lower to ensure the weld deposit meets or exceeds the base material toughness requirement. Consumables rated at −20 °C are acceptable and provide an additional safety margin without compromising weld procedure efficiency.
Dimensional Range
| Product Form | OD / Size Range | Wall Thickness |
|---|---|---|
| Seamless Pipe (EN 10210-1) | 21.3 mm – 610 mm OD | 3.2 mm – 100 mm |
| CHS Hot-Finished (EN 10210-1) | 26.9 mm – 508 mm OD | 3.2 mm – 40 mm |
| SHS Hot-Finished (EN 10210-1) | 40 × 40 mm – 400 × 400 mm | 3.0 mm – 40 mm |
| RHS Hot-Finished (EN 10210-1) | 50 × 30 mm – 500 × 300 mm | 3.0 mm – 40 mm |
| CHS Cold-Formed (EN 10219-1) | 21.3 mm – 406.4 mm OD | 2.0 mm – 20 mm |
| SHS / RHS Cold-Formed (EN 10219-1) | 20 × 20 mm – 400 × 200 mm | 2.0 mm – 16 mm |
Manufacturing Standards & Equivalents
- EN 10025-2: Chemical and mechanical requirements for S355J0 material
- EN 10210-1: Hot-finished structural hollow sections
- EN 10219-1: Cold-formed welded structural hollow sections
- EN 10216-1: Seamless steel tubes for pressure purposes
- EN 10217-1: Welded steel tubes for pressure purposes
Quality Assurance
- Mechanical Testing: Mechanical Testing — Tensile, yield, and elongation testing is performed per EN ISO 6892-1 on every heat. Charpy V-notch impact testing at 0 °C (min. 27 J) per EN ISO 148-1 is mandatory and documented for all S355J0 material. Hardness testing is conducted on hot-finished and seamless sections to confirm uniform through-wall properties.
- Dimensional Accuracy: Dimensional Accuracy — OD, wall thickness, length, straightness, ovality, and end squareness are verified against EN 10210 or EN 10219 tolerances. Seamless pipe is additionally measured for eccentricity to confirm wall thickness uniformity critical to structural and pressure performance.
- Weldability Tests: Weldability Tests — Weld procedure qualifications are conducted per EN ISO 15614-1, with Charpy impact testing of weld metal and HAZ at 0 °C to confirm the complete joint — not only the base material — meets the J0 toughness requirement.
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Industry We Serve
- Oil & Gas industries
- Chemical process industries
- Pump and valve in high pressure component
- Food industries
- Pulp and paper industry
- Aerospace industry
- Power plant
- Mechanical component
- Sugar industry
- Cement industry