EN 10217 S355J2H Electric Resistance Welded (ERW) Pipe
Important Clarification: Grade Designation
Note: EN 10217 S355J2H represents a specification combination where two different standards intersect. This pipe is typically multi-certified to meet both:
| Standard | Purpose | Grade |
|---|---|---|
| EN 10217-3 | Pressure purposes (welded tubes for pressure) | P355NH |
| EN 10219 | Structural engineering (cold-formed structural hollow sections) | S355J2H |
Major manufacturers produce tubes that are multi-certified to satisfy both standards, offering flexibility for projects requiring either certification .
Correct Grade Mapping
| Intended S355J2H | Actual EN 10217 Grade | Standard Part | Key Rationale |
|---|---|---|---|
| Structural S355J2H | P355NH | EN 10217-3 (Fine grain steels) | Primary pressure grade meeting S355J2H properties |
| Critical pressure service | P355NH TC2 | EN 10217-3 | Enhanced quality with ultrasonic weld examination |
| General pressure use | P355NH TC1 | EN 10217-3 | Standard quality, sufficient for most applications |
Key Features of EN 10217 S355J2H (P355NH) ERW Pipe
| Feature | Description |
|---|---|
| Material Type | Fine-grain, fully-killed carbon-manganese steel produced to fine grain practice for enhanced ductility |
| Manufacturing | High Frequency Welded (HFW) or Electric Resistance Welded (ERW) – longitudinal weld seam present, OD and ID weld beads fully removed |
| Yield Strength | 355 MPa minimum (51,500 psi) |
| Tensile Strength | 490-650 MPa (71,000-94,000 psi) |
| Elongation | 22% minimum (longitudinal) |
| Impact Properties | 27J minimum at -20°C (J2 designation) – matches S355J2H requirements |
| Key Advantages | High strength-to-weight ratio, excellent low-temperature toughness, suitable alternative to seamless tubes |
| Temperature Range | -20°C to +400°C for pressure applications |
| Certification | Supplied with 3.1 inspection certification to EN 10204 |
Chemical Composition (Typical for P355NH)
| Element | Content (%) | Notes |
|---|---|---|
| Carbon (C) | 0.22 max | Low carbon for weldability |
| Manganese (Mn) | 1.60 max | Provides strength |
| Phosphorus (P) | 0.025 max | Tight control |
| Sulfur (S) | 0.025 max | Critical for low-temperature toughness |
| Silicon (Si) | 0.60 max |
Mechanical Properties (S355J2H)
| Property | Value |
|---|---|
| Yield Strength (min) | > 295 MPa |
| Tensile Strength | 450 – 680 MPa |
| Tensile Modulus of Elasticity | 210 GPa |
| Tensile Strain at Break | > 16% |
| Density | 7.85 kg/dm³ |
| Thermal Conductivity | 54 W/(m*K) |
| Specific Heat Capacity | 461 J/(kg*K) |
| Specific Electrical Resistance | 0.15 (Ω*mm²)/m |
Comparison Table: S355J2H (EN 10219) vs. P355NH (EN 10217)
| Aspect | S355J2H (EN 10219) | P355NH (EN 10217-3) |
|---|---|---|
| Standard Purpose | Cold-formed structural hollow sections | Welded tubes for pressure purposes |
| Primary Application | Building frames, structural supports | Boilers, pressure vessels, process piping |
| Temperature Range | Ambient structural use | -20°C to +400°C with PED compliance |
| Testing Focus | Load-bearing capacity | Pressure integrity, weld seam quality |
| PED Compliance | No | Yes – fully aligned with Pressure Equipment Directive 2014/68/EU and AD2000 W4 |
| Quality Options | Standard | TC1 (standard) or TC2 (ultrasonic weld examination) |
Delivery Conditions & Size Availability
| Parameter | Hot-Finished | Weld Line Annealed (WLA) |
|---|---|---|
| Outside Diameter | 17.2 mm to 193.7 mm | 219.1 mm to 508 mm |
| Wall Thickness | 1.8 mm to 16 mm | Up to 25 mm |
| Delivery Condition | Normalized throughout | Weld seam normalized |
| Weld Bead | Fully removed (OD & ID) | Fully removed |
| Multi-Certification | EN 10219 S355J2H (for sizes ≥219.1mm OD) | EN 10219 S355J2H (for sizes ≥219.1mm OD) |
Test Categories: TC1 vs. TC2
| Category | Description | Typical Application |
|---|---|---|
| TC1 | Standard quality, without mandatory ultrasonic testing of weld seam – supplied as standard | General pressure applications, sufficient for most uses |
| TC2 | Enhanced quality, with mandatory ultrasonic testing of weld seam – available for sizes ≥ OD219.1mm | Critical service, low-temperature applications, higher integrity requirements |
Pressure Ratings (Reference Values)
Typical pressure ratings for EN 10217 P355NH (meets S355J2H properties) material :
| OD (mm) | Thickness (mm) | Designation | Recommended Max Operating Pressure (bar) |
|---|---|---|---|
| 60.3 | 3.91 | STD | 219 |
| 5.54 | XS | 307 | |
| 114.3 | 6.02 | STD | 179 |
| 8.56 | XS | 256 | |
| 219.1 | 8.18 | STD | 128 |
| 12.7 | XS | 198 | |
| 323.9 | 9.53 | STD | 101 |
| 12.7 | XS | 134 |
Note: Pressure ratings calculated based on ASME B31.3 and European guidelines for straight pipes with full penetration welded joints .
Testing & Inspection Requirements
| Test Type | Purpose |
|---|---|
| Chemical Analysis | Verify composition per specifications |
| Tensile Test | Confirm yield and tensile strength |
| Flattening Test | Verify ductility across weld seam |
| Bend Test | Check weld integrity and formability |
| Impact Test | Charpy V-notch at -20°C (J2 requirement) |
| Hydrostatic Test | Proof of leak-tightness |
| NDT of Weld Seam | Eddy current or ultrasonic examination (mandatory for TC2) |
| Visual & Dimensional | Exterior size inspection |
Mill Test Certificate: EN 10204/3.1B typical
Common Applications
| Industry | Applications |
|---|---|
| Industrial Conveyance | General purpose pressure and industrial conveyance solutions |
| HVAC | Specialist industrial heating and cooling systems |
| Steam Services | Steam pipelines and related applications |
| Petrochemical | Process plant and industrial conveyance |
| Fire Protection | Fire sprinkler systems and protection applications |
| Oil & Gas | Onshore gas pipelines (≤100 bar) |
| Wear Resistance | Applications requiring enhanced wear resistance |
| Structural Engineering | General engineering tube to EN 10219 (for sizes ≥219.1mm OD) |
Alternative Names & Equivalents
| Standard | Equivalent Grade |
|---|---|
| Material Number (DIN) | 1.0576 |
| EN 10219 | S355J2H (structural hollow sections) |
| DIN 1629 | St52.0N (seamless equivalent) |
| DIN 1630 | St52.4 (seamless equivalent) |
| DIN 17179 | WSt E355 (seamless equivalent) |
| DIN 1626 | St52.0N/G |
| DIN 17178 | WSt E 355 |
Key Advantages
| Advantage | Description |
|---|---|
| Multi-Certified | Satisfies both EN 10217 (pressure) and EN 10219 (structural) requirements |
| Seamless Alternative | Suitable substitute for equivalent hot-finished fine grain seamless tube grades |
| Weight Savings | Higher strength allows thinner walls – reduces supporting load bearing structures, hangers, brackets |
| Wear Resistance | Increased wear resistance provides improved service life |
| PED Compliance | Suitable for equipment in PED categories I, II, III or IV, aligned with AD2000 Merkblatt W4 |
| Fully Weldable | Excellent weldability with standard methods |
| Technical Support | Backed by technical experts for application advice |
Important Selection Notes
1. Correct Grade Designation
For pressure applications requiring S355J2H properties, specify EN 10217-3 P355NH
S355J2H is primarily a structural grade (EN 10219) for cold-formed hollow sections
Major manufacturers offer multi-certified tubes meeting both standards (e.g., Tata Steel Inflow™ Plus 355)
2. Size-Dependent Certification
For sizes ≥219.1mm OD, tubes are typically multi-certified to EN 10219 S355J2H
Smaller sizes may only carry pressure certification – verify with supplier
3. Quality Level Selection
TC1: Standard quality, sufficient for most applications
TC2: Enhanced quality with ultrasonic weld examination – available for sizes ≥219.1mm OD
4. Temperature Considerations
Standard range: -20°C to +400°C for pressure applications
Lower temperatures possible upon request with full application details
5. When to Choose S355J2H/P355NH
Applications requiring guaranteed toughness at -20°C
Projects needing multi-certified materials for flexibility between pressure and structural requirements
As a cost-effective alternative to seamless tubes
When higher strength allows thinner walls and weight savings
Final Takeaway: EN 10217 S355J2H ERW Pipe (technically P355NH per EN 10217-3) is a high-strength, multi-certified fine-grain steel welded tube that satisfies both pressure equipment (EN 10217) and structural hollow section (EN 10219) requirements. With minimum yield strength of 355 MPa and guaranteed impact properties of 27J at -20°C, it offers an excellent balance of strength, toughness, and weldability for demanding applications in industrial conveyance, petrochemical, steam services, and structural engineering. Major manufacturers produce tubes that are multi-certified to both standards, providing flexibility for projects requiring either certification. For critical service, specify EN 10217-3 P355NH with TC2 test category and EN 10204 3.1 certification.
