EN 10217 S235JR ERW Pipe
Basic Overview
EN 10217 S235JR ERW pipe is a welded carbon steel tube manufactured to the European standard for pressure purposes. S235JR is a non-alloy structural steel grade with a minimum yield strength of 235 MPa and guaranteed impact toughness of 27 J at room temperature (+20°C) . The ERW (Electric Resistance Welding) process produces a longitudinal weld seam without filler metal, making it suitable for low to medium pressure applications .
Understanding the Designation
| Part | Meaning |
|---|---|
| EN 10217 | European standard for welded steel tubes for pressure purposes |
| S235JR | Material grade – "S" indicates structural steel, "235" 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) | 235 MPa (for thickness ≤ 16mm) |
| Tensile Strength | 360-510 MPa |
| Elongation (min) | 24-26% (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 | Typically 21.3 mm to 660 mm OD (1/2" to 26") |
| Wall Thickness | 1.5 mm to 22.2 mm |
| Length | 3 m to 18 m standard; custom lengths available |
Chemical Composition
| Element | Maximum % | Notes |
|---|---|---|
| Carbon (C) | 0.17% | Low carbon for excellent weldability |
| Manganese (Mn) | 1.40% | Provides strength |
| Phosphorus (P) | 0.035% | Controlled for weldability |
| Sulfur (S) | 0.035% | Controlled for toughness |
| Silicon (Si) | 0.35% | Deoxidizer |
EN 10217 Standard Parts
EN 10217 is divided into multiple parts based on application. The table below shows the relevant parts for S235JR:
| Part | Title | Application |
|---|---|---|
| EN 10217-1 | Non-alloy steel tubes with specified room temperature properties | General pressure applications at ambient temperatures |
| EN 10217-2 | Electric welded tubes with elevated temperature properties | For elevated temperature service (up to 400°C) – S235JR is not typically used here; P235GH is the GH grade |
For S235JR, EN 10217-1 is the applicable standard .
Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Yield Strength ReH (min) | 235 MPa | Thickness ≤ 16mm |
| 225 MPa | 16mm < t ≤ 40mm | |
| Tensile Strength Rm | 360-510 MPa | Thickness ≥ 3mm |
| Elongation (min) | 24% | Longitudinal, L₀ = 5.65√S₀ |
| Impact Energy (min) | 27 J | +20°C, 10×10mm specimen |
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 |
|---|---|
| Low-Pressure Fluid Transmission | Water, gas, oil, and air lines |
| Structural Applications | Building frames, supports, scaffolding |
| General Engineering | Machinery components, conveyor systems |
| Infrastructure | Fencing, handrails, barriers |
| Heating Systems | Low-temperature heating circuits |
| Piling and Foundations | Light to medium load-bearing piles |
Key Advantages
| Advantage | Description |
|---|---|
| Good Weldability | Low carbon content allows welding without pre-heating for most thicknesses |
| Cost-Effective | ERW process provides economic advantage over seamless for many sizes |
| Wide Availability | Commonly stocked by manufacturers globally |
| Guaranteed Toughness | 27 J at +20°C ensures reliable performance at room temperature |
| CE/UKCA Marking | Available for construction products 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. S235JR vs. S235JRH
S235JR: Material grade defined in EN 10025-2
S235JRH: Hollow section designation under EN 10219 for cold-formed welded tubes – the "H" suffix indicates hollow section
For ERW pipe under EN 10219, S235JRH is the correct grade designation
3. Impact Properties
The "JR" suffix guarantees Charpy impact energy of 27 J at +20°C
For 0°C impact requirements, specify S235J0 (J0 suffix)
For -20°C impact requirements, specify S235J2 (J2 suffix)
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 S235JR 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)
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 3.1 with full test results
Third-party inspection (SGS, BV, Lloyds) available upon request
International Equivalents
| Standard | Equivalent Grade | Notes |
|---|---|---|
| ASTM | A36 | Similar yield strength, different impact requirements |
| GB/T | Q235B | Chinese equivalent |
| JIS | SS400 | Japanese standard |
| DIN | ST37-2 | Historical German equivalent |
Summary
EN 10217 S235JR ERW pipe is a welded carbon steel tube manufactured to the European pressure standard. With minimum yield strength of 235 MPa and guaranteed impact toughness of 27 J at +20°C, this pipe is widely used in low-pressure fluid transmission, structural applications, and general engineering throughout Europe and globally .
Key features:
Manufactured to EN 10217-1 for pressure purposes
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)
Available with EN 10204 Type 3.1 mill certificates for full traceability
Common applications include:
Low-pressure water, gas, and oil lines
Structural frames and supports
Fencing, handrails, and barriers
General engineering components
When ordering, specify: EN 10217-1, Grade S235JR, ERW, Size (OD x WT), Length, End Finish, Coating, and EN 10204 Certificate Type .
