EN 10204 S355J2H ERW Pipe
Basic Overview
EN 10204 S355J2H ERW pipe combines a high-strength structural steel grade (S355J2H) with European certification standards. S355J2H is a normalized fine-grain structural steel with a minimum yield strength of 355 MPa and guaranteed impact toughness of 27 J at -20°C [citation:5, citation:10]. This combination is widely used in demanding construction, offshore, and infrastructure projects throughout Europe and globally [citation:3, citation:6].
Understanding the Designation
| Part | Meaning |
|---|---|
| EN 10204 | European standard for inspection documents – defines the type of mill certificate (e.g., 3.1, 3.2) |
| S355J2H | The material grade – "S" indicates structural steel, "355" is minimum yield strength in MPa, "J2" denotes impact testing at -20°C (27J min), and "H" indicates hollow section [citation:5, citation:10] |
| ERW | Electric Resistance Welded – pipe formed from steel coil and welded longitudinally [citation:1, citation:10] |
Key Features
| Feature | Description |
|---|---|
| Yield Strength (min) | 355 MPa (for thickness ≤ 16mm) [citation:5, citation:10] |
| Tensile Strength | 470-630 MPa [citation:5, citation:10] |
| Elongation (min) | 20-24% (depending on wall thickness) |
| Impact Energy (min) | 27 J at -20°C – the "J2" suffix guarantees low-temperature toughness [citation:5, citation:10] |
| Manufacturing | Electric Resistance Welded (ERW) / High-Frequency Welding (HFW) – cold formed with weld seam heat treatment |
| Size Range | 21.3 mm to 610 mm (1/2" to 24") OD [citation:1, citation:10] |
| Wall Thickness | 1.0 mm to 22.2 mm [citation:1, citation:10] |
| Length | 6 m to 12 m standard; custom lengths available [citation:3, citation:10] |
| Product Standard | EN 10219-1 / EN 10219-2 – cold-formed welded structural hollow sections [citation:4, citation:9] |
Chemical Composition
| Element | Maximum % | Notes |
|---|---|---|
| Carbon (C) | 0.22% | Low carbon for good weldability [citation:5, citation:10] |
| Silicon (Si) | 0.55% | Deoxidizer [citation:5, citation:10] |
| Manganese (Mn) | 1.60% | Provides strength [citation:5, citation:10] |
| Phosphorus (P) | 0.030% | Controlled for weldability [citation:5, citation:10] |
| Sulfur (S) | 0.020-0.030% | Controlled for toughness [citation:5, citation:10] |
| Aluminum (Al total) | ≥0.020% | Fully killed steel for fine grain structure |
Note: Fully killed, fine grain practice ensures consistent low-temperature properties .
Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Yield Strength ReH (min) | 355 MPa | Thickness ≤ 16mm [citation:5, citation:10] |
| 345 MPa | 16mm < t ≤ 40mm | |
| Tensile Strength Rm | 470-630 MPa | Thickness 3-16mm [citation:5, citation:10] |
| Elongation (min) | 20-24% | Longitudinal, varies by thickness |
| Impact Energy (min) | 27 J | -20°C, 10×10mm specimen [citation:5, citation:10] |
| Modulus of Elasticity | 200 GPa | |
| Density | 7.85 g/cm³ |
EN 10204 Inspection Documents
EN 10204 is the certification standard for metallic products. When you specify "EN 10204 S355J2H ERW pipe", the pipe is supplied with a mill certificate confirming the material meets S355J2H requirements :
| Type | Description | Applicability |
|---|---|---|
| 3.1 | Inspection certificate issued by the manufacturer's independent testing department; results from actual supplied product | Most common for general construction and machinery projects |
| 3.2 | Inspection certificate with third-party witness (e.g., TUV, BV, DNV, Lloyds) | For high-risk projects: oil/gas pipelines, offshore platforms, nuclear facilities |
Typical Mill Test Certificate (EN 10204 3.1) includes:
Chemical composition analysis
Mechanical properties (yield strength, tensile strength, elongation)
Impact toughness at -20°C
Dimensional tolerance and appearance inspection
Product Standards
S355J2H ERW pipe is manufactured to the EN 10219 series of standards:
| Standard | Purpose |
|---|---|
| EN 10219-1 | Technical delivery conditions for cold-formed welded structural hollow sections [citation:4, citation:9] |
| EN 10219-2 | Tolerances, dimensions, and sectional properties |
Key requirements under EN 10219 :
100% non-destructive testing of weld seam (eddy current or ultrasonic)
Online normalizing heat treatment of the weld zone
Grain size verification (≥ grade 7)
Hardness uniformity (≤180HV)
-20°C Charpy impact test (≥27J)
Hydrostatic testing for pipe body tightness
Dimensional Tolerances (EN 10219-2)
| Parameter | Tolerance |
|---|---|
| Outside Diameter | ±1% (min ±0.5mm, max ±10mm) |
| Wall Thickness (t ≤ 5mm) | ±10% |
| Wall Thickness (t > 5mm) | ±0.5mm |
| Straightness | ≤ 0.15-0.20% of total length (max 3mm/m) |
| Out-of-Roundness | ≤ 2% (for D/T ≤ 100) |
| Length Tolerance (6-12m) | 0 – +15mm (D < 406.4mm); 0 – +50mm (D ≥ 406.4mm) |
Common Applications
| Application | Description |
|---|---|
| Offshore Platforms | Marine structures, oil/gas platforms in cold environments [citation:3, citation:5] |
| Bridge Construction | Structural members, supports, railings in cold climates |
| High-Rise Buildings | Columns, beams, trusses requiring high strength and low-temperature toughness |
| Wind Turbine Towers | Large-diameter support structures for cold climate installations |
| Mechanical Engineering | Crane booms, excavator components, agricultural equipment |
| Infrastructure Projects | Tunnels, retaining walls, highway structures |
| Piling and Foundations | Deep foundations, steel piling |
| Pressure Applications | With EN 10217-2 standard (PED certified) |
Key Advantages
| Advantage | Description |
|---|---|
| High Strength | 355 MPa yield – approximately 50% higher than S235 and 30% higher than S275 |
| Low-Temperature Toughness | Guaranteed 27 J at -20°C – suitable for cold climates and arctic applications [citation:5, citation:10] |
| Excellent Weldability | Low carbon content and controlled carbon equivalent ensure good field weldability |
| Fine Grain Structure | Fully killed steel with aluminum deoxidation provides consistent properties |
| Cost-Effective | ERW process provides economic advantage over seamless for many sizes |
| Wide Availability | Commonly stocked by manufacturers globally [citation:3, citation:10] |
| CE/UKCA Marking | Available for construction products under EU/UK regulations |
Important Considerations
1. EN 10204 is NOT a Material Grade
EN 10204 is a certification standard, not a material grade
A pipe specified as "EN 10204 S355J2H" means the pipe is made from S355J2H steel and supplied with an EN 10204 inspection certificate
2. S355J2H vs. Other S355 Suffixes
| Suffix | Impact Test Temperature | Typical Application |
|---|---|---|
| S355JR | +20°C | Indoor or warm climate applications |
| S355J0 | 0°C | Temperate climate outdoor structures |
| S355J2H | -20°C | Cold climates, offshore, demanding applications |
| S355K2H | -20°C (40J min) | Critical applications requiring higher toughness |
3. ERW Manufacturing Process
S355J2H ERW pipes are produced using high-frequency resistance welding :
Cold forming from steel coil
High-frequency welding without filler metal
Online normalizing heat treatment of weld seam
100% non-destructive testing (eddy current/ultrasonic)
Hydrostatic testing
4. Size Limitations
ERW process typically limited to up to 24 inches (610 mm) OD [citation:1, citation:10]
Larger diameters (610-1422 mm) require LSAW or SSAW manufacturing
5. Coating Options
Black (bare): Standard mill finish
Hot-dip galvanized: For corrosion protection (to EN ISO 1461)
3LPE/FBE: For buried applications
Varnish/Anti-rust oil: Temporary protection during transport
6. Testing Requirements
Typical tests for S355J2H ERW pipe include [citation:1, citation:10]:
Chemical analysis
Tensile test (yield strength, tensile strength, elongation)
Flattening test
Bend test
Charpy impact test at -20°C (27J min)
Hydrostatic test
Non-destructive testing (ultrasonic or eddy current)
International Equivalents
| Standard | Equivalent Grade | Notes |
|---|---|---|
| ASTM | A572 Grade 50 | Similar yield strength, different impact requirements |
| GB/T | Q355D | Chinese equivalent with -20°C impact |
| JIS | SM490YA | Japanese standard |
| DIN | St52-3N | Historical German equivalent |
Summary
EN 10204 S355J2H ERW pipe is a high-strength structural steel pipe combining the S355J2H material grade with EN 10204 certification. With minimum yield strength of 355 MPa and guaranteed impact toughness of 27 J at -20°C, this pipe is ideal for demanding applications in cold climates, offshore structures, bridges, and heavy machinery [citation:3, citation:5].
Key features:
High strength-to-weight ratio enables material savings in structural designs
Low carbon content (≤0.22%) ensures excellent weldability
The "J2" suffix guarantees -20°C impact toughness – critical for cold climate applications
Cold-formed ERW process provides tight dimensional tolerances and good surface finish
Supplied with EN 10204 Type 3.1 mill certificates for full traceability
Common applications include:
Offshore platforms and marine structures [citation:3, citation:5]
Bridge structural members in cold climates
Wind turbine towers
High-rise building columns and beams
Crane booms and heavy machinery frames
Piling and deep foundations
When ordering, specify: EN 10219-1, Grade S355J2H, ERW, Size (OD x WT), Length, End Finish, Coating, and EN 10204 Certificate Type [citation:3, citation:4].
