P355NH vs S355J2+N: 69% composition overlap. Moderate differences, generally not direct substitutes.
P355NH vs S355J2+N
Side-by-side chemical composition and mechanical property comparison.
Overview
P355NH
1.0565
Weldable fine-grained non-alloy steel for pressure vessels with minimum yield strength 355 MPa. NH designation indicates normalized condition with specified elevated temperature properties and impact testing at -20°C. Very widely used pressure vessel grade for boilers, storage tanks, heat exchangers, and pipes transporting hot liquids and pressurized gases. Good weldability and resistance to brittle cracking.
S355J2+N
1.0577
Normalized structural steel with 355 MPa minimum yield strength and J2 impact toughness (27J at -20°C). The normalized delivery condition (+N) ensures refined grain structure and uniform properties throughout the cross-section. Required for EN 1090 execution classes EXC3/EXC4 in structural steelwork. The standard choice for bridges, high-rise frames, crane runways, and wind tower sections where both strength and guaranteed low-temperature toughness are needed. Weldable with CEV typically <0.45.
| P355NH | S355J2+N | |
|---|---|---|
| Material Number | 1.0565 | 1.0577 |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10028-3 | EN 10025-2 |
Chemical composition (wt%)
| Element | P355NH | S355J2+N | Overlap |
|---|---|---|---|
| C | ≤ 0.18% | ≤ 0.2% | OK |
| Si | ≤ 0.5% | ≤ 0.55% | OK |
| Mn | 1.1–1.7% | ≤ 1.6% | Partial |
| P | ≤ 0.025% | ≤ 0.03% | OK |
Mechanical properties
| Property | P355NH | S355J2+N | Unit |
|---|---|---|---|
| tensile_strength | 490–630 | 470–630 | MPa |
| yield_strength | ≥ 355 | ≥ 355 | MPa |
| elongation | ≥ 22 | ≥ 22 | % |
Compatibility Assessment
P355NH and S355J2+N have moderate differences (69% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is P355NH the same as S355J2+N?
P355NH and S355J2+N have a 69% composition overlap. They are generally not directly interchangeable.
Can I replace P355NH with S355J2+N?
Generally not recommended. The compositions differ significantly (69% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between P355NH and S355J2+N?
The main differences are in the following elements: Mn. P355NH is a Carbon Steel grade, while S355J2+N is a Carbon Steel grade.
View full data for each material:
Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.