EN 10204 S355JR ERW Pipe
Basic Overview
EN 10204 S355JR ERW pipe combines a high-strength structural steel grade (S355JR) with European certification standards. S355JR is a non-alloy structural steel with a minimum yield strength of 355 MPa, approximately 50% higher than S235 and 30% higher than S275 . This combination is widely used in demanding construction, infrastructure, and engineering applications throughout Europe and globally .
Understanding the Designation
| Part | Meaning |
|---|---|
| EN 10204 | European standard for inspection documents – defines the type of mill certificate (e.g., 3.1, 2.2) |
| S355JR | The material grade – non-alloy structural steel with minimum yield strength of 355 MPa and impact tested at room temperature (27J at +20°C) |
| ERW | Manufacturing process – Electric Resistance Welded pipe formed from steel coil |
Key Features
| Feature | Description |
|---|---|
| Yield Strength (min) | 355 MPa (for thickness ≤ 16mm) |
| Tensile Strength | 470-630 MPa (for thickness 3-16mm) |
| Elongation (min) | 20-22% (longitudinal) |
| Impact Energy (min) | 27 J at +20°C – the "JR" suffix guarantees room temperature toughness |
| Manufacturing | Electric Resistance Welded (ERW) / High-Frequency Welding (HFW) – cold formed and high-frequency welded |
| Size Range | Typically 1/2" to 24" (21.3 mm to 610 mm) OD |
| Wall Thickness | 1.65 mm to 20 mm (common range 3-16 mm) |
| Length | 3 m to 12 m standard; custom lengths available |
| End Finish | Plain ends, beveled ends, or threaded |
Chemical Composition (Typical)
| Element | Maximum % | Notes |
|---|---|---|
| Carbon (C) | 0.20-0.22% | Low carbon for weldability |
| Manganese (Mn) | 1.60% | Provides strength |
| Silicon (Si) | 0.55% | Deoxidizer |
| Phosphorus (P) | 0.025-0.035% | Controlled for weldability |
| Sulfur (S) | 0.025-0.035% | Controlled for toughness |
Note: Actual limits vary by manufacturer. Higher toughness grades have tighter controls .
Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Yield Strength ReH (min) | 355 MPa | Thickness ≤ 16mm |
| 345 MPa | 16mm < t ≤ 40mm | |
| Tensile Strength Rm | 470-630 MPa | Thickness 3-16mm |
| Elongation (min) | 20-22% | Longitudinal, 5.65√S₀ |
| Impact Energy (min) | 27 J | +20°C, 10×10mm specimen |
EN 10204 Inspection Documents
EN 10204 is the certification standard for metallic products. When you specify "EN 10204 S355JR ERW pipe", the pipe is supplied with a mill certificate confirming the material meets S355JR requirements :
| Type | Description |
|---|---|
| 2.1 | Declaration of compliance with order requirements; no test results included |
| 2.2 | Test report based on non-specific inspection; results from representative samples |
| 3.1 | Inspection certificate issued by the manufacturer's independent testing department; results from actual supplied product |
| 3.2 | Inspection certificate with third-party witness (e.g., SGS, BV, Lloyds) |
Mill Test Certificate is typically provided as EN 10204 Type 3.1B for full traceability .
Product Standards vs. Material Standard
| Designation | Standard | Purpose |
|---|---|---|
| S355JR | EN 10025-2 | Material standard – defines chemical composition and mechanical properties of the steel |
| S355JRH | EN 10219 | Product standard for cold-formed welded structural hollow sections – the "H" suffix indicates hollow section |
For ERW pipe, the correct product standard is typically EN 10219-1 (cold-formed welded structural hollow sections) . Other applicable standards include EN 10217 (pressure purposes) and EN 10224 (water conveyance) depending on application .
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 | ≤ 0.20% 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 |
|---|---|
| High-Rise Building Construction | Columns, beams, trusses for tall structures |
| Bridge Engineering | Structural members, supports, railings |
| Offshore Structures | Platforms, marine installations requiring high strength |
| Wind Turbine Towers | Large-diameter support structures |
| Heavy Machinery | Crane booms, excavator components, agricultural equipment |
| Infrastructure Projects | Tunnels, retaining walls, highway structures |
| Pressure Applications | With appropriate product standard (EN 10217) |
| Water Conveyance | With EN 10224 standard |
Key Advantages
| Advantage | Description |
|---|---|
| High Strength | 355 MPa yield – approximately 50% higher than S235 and 30% higher than S275 |
| Excellent Weldability | Low carbon equivalent ensures good field weldability |
| Good Impact Resistance | 27 J guaranteed at room temperature (+20°C) |
| Cost-Effective | ERW process provides economic advantage over seamless for many sizes |
| Wide Availability | Commonly stocked by manufacturers globally |
| 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 S355JR" means the pipe is made from S355JR steel and supplied with an EN 10204 inspection certificate
2. S355JR vs. Higher Toughness Suffixes
S355JR: 27 J at +20°C – suitable for indoor or warm climate applications
S355J0: 27 J at 0°C – suitable for temperate climate outdoor structures
S355J2H: 27 J at -20°C – suitable for cold climates and demanding applications
3. Product Standard Selection
EN 10219: Structural hollow sections – for building, bridge, mechanical applications
EN 10217: Pressure purposes – for boilers, pressure vessels
EN 10224: Water conveyance – for water pipelines
4. ERW Manufacturing Benefits
ERW process produces consistent wall thickness and dimensional accuracy
Cold forming improves surface finish
100% non-destructive testing (ultrasonic or eddy current) ensures weld integrity
5. Size Limitations
ERW process typically limited to up to 24 inches (610 mm) OD
Larger diameters require LSAW or SSAW manufacturing
6. Coating Options
Black (bare): Standard mill finish
Hot-dip galvanized: For corrosion protection (to EN ISO 1461) – requires controlled Si content
3LPE/FBE: For buried applications
Varnish/Anti-rust oil: Temporary protection during transport
7. Testing Requirements
Typical tests for S355JR ERW pipe include :
Chemical analysis
Tensile test (yield strength, tensile strength, elongation)
Flattening test
Bend test
Charpy impact test (27J at +20°C)
Hydrostatic test
Non-destructive testing (ultrasonic or eddy current)
International Equivalents
| Standard | Equivalent Grade | Notes |
|---|---|---|
| ASTM | A572 Grade 50 | Similar yield strength |
| GB/T | Q355 | Chinese equivalent |
| JIS | SM490 | Japanese standard |
| DIN | St52-3 | Historical German equivalent |
Summary
EN 10204 S355JR ERW pipe is a high-strength structural steel pipe combining the S355JR material grade with EN 10204 certification. With minimum yield strength of 355 MPa (approximately 50% higher than S235 and 30% higher than S275), this pipe is widely used in demanding applications such as high-rise buildings, bridges, offshore structures, wind turbine towers, and heavy machinery .
Key features:
High strength-to-weight ratio enables material savings in structural designs
Low carbon content ensures excellent weldability without pre-heating for most thicknesses
The "JR" suffix guarantees room temperature impact toughness (27 J at +20°C)
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:
Building columns, beams, and roof trusses
Bridge structural members and railings
Offshore platforms and marine structures
Wind turbine towers
Crane booms and heavy machinery frames
When ordering, specify: EN 10219-1, Grade S355JRH, ERW, Size (OD x WT), Length, End Finish, Coating, and EN 10204 Certificate Type .
