Basic Overview
EN 10217 S355JR ERW pipe is a welded carbon steel tube manufactured to the European standard for pressure purposes . S355JR is a high-strength structural steel grade with a minimum yield strength of 355 MPa-approximately 50% higher than S235JR and 30% higher than S275JR-and guaranteed impact toughness of 27 J at room temperature (+20°C) . The ERW (Electric Resistance Welding) process produces a longitudinal weld seam, making this pipe suitable for demanding pressure applications, industrial process piping, and high-strength structural components .
Understanding the Designation
| Part | Meaning |
|---|---|
| EN 10217 | European standard for welded steel tubes for pressure purposes |
| S355JR | Material grade – "S" indicates structural steel, "355" is minimum yield strength in MPa, "JR" denotes impact testing at +20°C (27J min) |
| ERW | Electric Resistance Welded – pipe formed from steel coil and welded longitudinally without filler metal |
Key Features
| Feature | Description |
|---|---|
| Yield Strength (min) | 355 MPa (for thickness ≤ 16mm) |
| Tensile Strength | 470-630 MPa |
| Elongation (min) | 20-22% (depending on wall thickness) |
| Impact Energy (min) | 27 J at +20°C – the "JR" suffix guarantees room temperature toughness |
| Manufacturing | Electric Resistance Welded (ERW) – cold formed and high-frequency welded |
| Size Range | 21.3 mm to 660 mm (1/2" to 26") OD |
| Wall Thickness | 1.5 mm to 22.2 mm |
| Length | 3 m to 18 m standard; custom lengths available |
| End Finishes | Plain ends, beveled ends, threaded |
Chemical Composition
| Element | Maximum % | Notes |
|---|---|---|
| Carbon (C) | 0.20-0.22% | Low carbon for good weldability |
| Silicon (Si) | 0.55% | Deoxidizer |
| Manganese (Mn) | 1.60% | Provides strength |
| Phosphorus (P) | 0.025-0.035% | Controlled for weldability |
| Sulfur (S) | 0.025-0.035% | Controlled for toughness |
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 |
| Modulus of Elasticity | 200 GPa | |
| Density | 7.85 g/cm³ |
EN 10217 Standard Parts
EN 10217 is divided into multiple parts based on application :
| Part | Title | Application |
|---|---|---|
| EN 10217-1 | Non-alloy steel tubes with specified room temperature properties | General pressure applications at ambient temperatures – applicable for S355JR |
| EN 10217-2 | Electric welded tubes with elevated temperature properties | For elevated temperature service (up to 400°C) – S355JR is not typically used; P235GH/P265GH are the GH grades |
For S355JR, EN 10217-1 is the applicable standard .
Dimensional Tolerances
| 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) |
| Length (fixed) | +50mm / -0mm |
Common Applications
| Application | Description |
|---|---|
| Pressure Vessels | Tanks and vessels for non-corrosive fluids at ambient temperatures |
| Industrial Piping | Process piping in chemical and petrochemical plants |
| Boiler Tubes | Low to medium pressure boiler applications (with GH grade) |
| High-Strength Structures | Building frames, columns, roof trusses |
| Offshore Structures | Marine platforms requiring high strength |
| Water Transmission | High-pressure water mains |
| Mechanical Engineering | Machinery components, conveyor systems |
Key Advantages
| Advantage | Description |
|---|---|
| High Strength | 355 MPa yield – 50% higher than S235, 30% higher than S275 |
| Good Weldability | Low carbon content ensures excellent field weldability |
| Guaranteed Toughness | 27 J at +20°C ensures reliable performance at room temperature |
| 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 and pressure equipment under EU regulations |
Important Considerations
1. EN 10217 is a Pressure Standard
EN 10217 is specifically for pressure purposes
For structural applications (non-pressure), EN 10219 is the appropriate standard
2. S355JR vs. S355J2H/S355J0H
S355JR: Material grade defined in EN 10025-2 for plates, sections, bars; impact testing at +20°C
S355J0H: Hollow section designation under EN 10219 with impact testing at 0°C
S355J2H: Hollow section with impact testing at -20°C – recommended for cold climates
For ERW pipe under EN 10219, S355J2H is the correct grade designation for -20°C applications
3. EN 10217 vs. EN 10219
EN 10217: Pressure purposes – includes hydrostatic testing requirements
EN 10219: Structural hollow sections – no hydrostatic test required
4. ERW Manufacturing Process
ERW pipes are produced using high-frequency resistance welding :
Cold forming from steel coil
High-frequency welding without filler metal
100% non-destructive testing of weld seam (ultrasonic or eddy current)
Hydrostatic testing for pressure applications
5. Testing Requirements
Typical tests for EN 10217 S355JR ERW pipe include :
Chemical analysis
Tensile test (yield strength, tensile strength, elongation)
Flattening test
Bend test
Hydrostatic test
Non-destructive testing (ultrasonic or eddy current)
Impact test (27J at +20°C)
6. 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
7. Mill Test Certificate
Typically provided as EN 10204 Type 3.1B with full test results
Third-party inspection (SGS, BV, Lloyds) available upon request
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 10217 S355JR ERW pipe is a high-strength welded carbon steel tube manufactured to the European pressure standard. With minimum yield strength of 355 MPa-approximately 50% higher than S235JR-and guaranteed impact toughness of 27 J at +20°C, this pipe is suitable for demanding pressure applications, industrial process piping, and high-strength structural components throughout Europe and globally .
Key features:
Manufactured to EN 10217-1 for pressure purposes
High strength-to-weight ratio enables material savings in pressure vessel and piping designs
Low carbon content ensures excellent weldability
ERW process provides cost-effective production for sizes up to 24" OD
The "JR" suffix guarantees room temperature impact toughness (27 J at +20°C)
Supplied with EN 10204 Type 3.1 mill certificates for full traceability
Common applications include:
Pressure vessels and industrial process piping
High-strength structural frames and supports
Water transmission and mechanical engineering components
When ordering, specify: EN 10217-1, Grade S355JR, ERW, Size (OD x WT), Length, End Finish, Coating, and EN 10204 Certificate Type . For cold climate applications requiring -20°C impact toughness, specify EN 10219-1, Grade S355J2H instead .
