EN 10217 S235JR Electric Resistance Welded (ERW) Pipe
Basic Overview
A European standard specification for electric resistance welded steel tubes made from S235JR carbon steel, designed for pressure purposes. This combination represents a common entry-level material for general pressure applications and fluid conveyance systems.
Name Explanation
| Part | Meaning |
|---|---|
| EN | European Norm (standard) |
| 10217 | Standard for welded steel tubes for pressure purposes |
| S235JR | Steel grade designation – S = structural steel, 235 = minimum yield strength (MPa), JR = room temperature impact test requirement (27J at 20°C) |
| Electric Resistance Welded | Manufacturing process – pipe formed from strip and welded longitudinally without filler metal |
Key Features of EN 10217 S235JR ERW Pipe
| Feature | Description |
|---|---|
| Material Type | Non-alloy carbon steel |
| Manufacturing | Electric Resistance Welded (ERW) – longitudinal weld seam present, weld seam may be normalized |
| Yield Strength | 235 MPa minimum (for thickness ≤16mm) |
| Tensile Strength | 360-510 MPa (typical range) |
| Key Property | Good weldability, moderate strength, economical |
| Temperature Range | Typically -20°C to +400°C for pressure applications |
| Typical Diameters | 21.3mm to 660mm (ERW) |
| Typical Wall Thickness | 1.5mm to 22.2mm |
Chemical Composition (S235JR)
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.12-0.20 |
| Silicon (Si) | 0.30 max |
| Manganese (Mn) | 0.30-0.70 |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.045 max |
| Nitrogen (N) | 0.014 max |
Note: For EN 10217 pressure applications, chemistry may have tighter controls than standard S235JR structural grade.
Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (min) | 235 MPa |
| Tensile Strength | 360-510 MPa |
| Elongation | 25-30% (depends on wall thickness) |
| Impact Test (Charpy V-notch) | 27J minimum at 20°C (JR designation) |
Comparison Table: EN 10217 vs. EN 10219 for S235 Material
| Aspect | EN 10217 S235JR | EN 10219 S235JRH |
|---|---|---|
| Standard Purpose | Pressure purposes | Cold-formed structural hollow sections |
| Primary Application | Fluid conveyance under pressure | Building frames, structural supports |
| Design Focus | Pressure containment | Load-bearing capacity |
| Testing Requirements | Hydrostatic or NDT pressure test | No pressure testing |
| Temperature Rating | Designed for pressure/temperature service | Ambient structural use |
| Certification | Often EN 10204 3.1 with pressure tests | Mill certificates typical |
EN 10217 Parts & S235JR Applicability
EN 10217 is divided into several parts. S235JR typically falls under:
| Part | Applicability to S235JR |
|---|---|
| Part 1 | Non-alloy tubes with specified room temperature properties – S235JR fits here as a room temperature grade |
| Part 2 | Elevated temperature properties – P235GH is more common; S235JR may be used for lower temperature ranges |
| Note | S235JR is not typically specified for high-temperature boiler applications (use P235GH or 16Mo3 instead) |
Common Applications
| Industry | Applications |
|---|---|
| Fluid Transport | Low-pressure water, gas, and oil lines |
| Industrial Piping | Compressed air, steam services up to 400°C |
| Construction | Structural supports, scaffolding, piling |
| Utilities | Water supply, heating systems |
| Fire Protection | Fire sprinkler systems |
| General Engineering | Mechanical applications, equipment frames |
ERW Manufacturing Process
Forming: Steel strip/sheet is cold-formed into cylindrical shape.
Welding: High-frequency electric resistance welding (HF-ERW) joins edges without filler metal.
Heat Treatment: Weld seam may be normalized (online heat treatment) to refine grain structure .
Sizing: Final dimensions achieved through sizing rolls.
NDT: Weld seam tested by eddy current or ultrasonic methods.
Hydrostatic Test: Pressure integrity verification for pressure applications.
Size Availability
| Parameter | Typical Range |
|---|---|
| Outside Diameter | 21.3mm to 660mm (1/2" to 26") |
| Wall Thickness | 1.5mm to 22.2mm |
| Length | 3m to 18m (customizable) |
| End Finish | Plain, beveled, or threaded |
Testing & Certification
Typical Tests Performed
| Test Type | Purpose |
|---|---|
| Chemical Analysis | Verify composition meets S235JR limits |
| Tensile Test | Confirm yield and tensile strength |
| Flattening Test | Check ductility and weld integrity |
| Bend Test | Verify formability |
| Impact Test | Charpy V-notch at 20°C (JR requirement) |
| Hydrostatic Test | Proof of leak tightness |
| NDT of Weld Seam | Eddy current or ultrasonic examination |
Certification
Typically supplied with EN 10204 3.1 inspection certificate :
3.1 Certificate: Manufacturer's independent testing department certifies results from actual supplied products
3.2 Certificate: Third-party witnessed testing (when specified for critical applications)
Surface Finish & Protection Options
| Coating Type | Application |
|---|---|
| Black (bare) | Standard mill finish, indoor use |
| Anti-rust oil | Temporary protection during transit |
| Varnish coating | Short-term corrosion protection |
| Black painting | Basic corrosion protection |
| 3LPE / FBE | Buried pipelines, harsh environments |
| Galvanized | Outdoor exposed applications |
International Equivalents (Approximate)
| Standard | Equivalent Grade |
|---|---|
| ASTM A53 | Gr.B (similar strength: 240 MPa yield) |
| ASTM A106 | Gr.B (similar tensile range) |
| DIN 1629 | St37.0 |
| BS 4360 | Grade 43 |
| GB/T 3091 | Q235B |
| ISO 630 | E235B |
Important Selection Notes
1. EN 10217 vs. EN 10219 Distinction
EN 10217 is for pressure purposes
EN 10219 is for cold-formed structural hollow sections
Always specify EN 10217 if the pipe will contain fluid under pressure
2. Temperature Limitations
S235JR is suitable for -20°C to +400°C for pressure applications
For temperatures above 400°C, specify P235GH or 16Mo3 (EN 10217-2)
For temperatures below -20°C, specify low-temperature grades (P265NL, etc.)
3. Quality Considerations
For critical pressure applications, ensure EN 10204 3.1 certification
Specify TC2 test category if ultrasonic weld examination is required
4. When to Choose EN 10217 S235JR ERW
General low-to-medium pressure fluid systems
Water, air, and non-corrosive gas lines
Cost-effective alternative to seamless for many applications
Applications not requiring high-temperature or low-temperature grades
Final Takeaway: EN 10217 S235JR ERW Pipe is a European standard welded pressure tube made from common structural carbon steel. It offers an economical solution for low-to-medium pressure fluid conveyance applications including water, gas, oil, and steam services up to 400°C. The S235JR grade provides good weldability and moderate strength, while EN 10217 ensures the pipe meets pressure equipment requirements. For critical applications, specify EN 10204 3.1 certification and consider whether P235GH (elevated temperature) or low-temperature grades would be more appropriate for your service conditions.
