P355N vs P355NH: 100% composition overlap. Very similar materials, likely interchangeable for most applications.
P355N vs P355NH
Side-by-side chemical composition and mechanical property comparison.
Overview
P355N
1.0562
Weldable fine-grained non-alloy steel for pressure vessels with minimum yield strength 355 MPa in normalized condition. N designation indicates impact testing at room temperature. Widely used medium-strength pressure vessel grade for boilers, heat exchangers, storage tanks, and process vessels. Also standardized for seamless tubes (EN 10216-3) and welded tubes (EN 10217-3). Equivalent to ASTM A537 Class 1.
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.
| P355N | P355NH | |
|---|---|---|
| Material Number | 1.0562 | 1.0565 |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10028-3 | EN 10028-3 |
Chemical composition (wt%)
| Element | P355N | P355NH | Overlap |
|---|---|---|---|
| C | ≤ 0.18% | ≤ 0.18% | OK |
| Si | ≤ 0.5% | ≤ 0.5% | OK |
| Mn | 1.1–1.7% | 1.1–1.7% | OK |
| P | ≤ 0.025% | ≤ 0.025% | OK |
Mechanical properties
| Property | P355N | P355NH | Unit |
|---|---|---|---|
| tensile_strength | 490–630 | 490–630 | MPa |
| yield_strength | ≥ 355 | ≥ 355 | MPa |
| elongation | ≥ 22 | ≥ 22 | % |
Compatibility Assessment
P355N and P355NH have very similar compositions (100% overlap) and are likely interchangeable for most applications. Verify mechanical properties for your specific use case.
Automated assessment based on composition analysis
Frequently Asked Questions
Is P355N the same as P355NH?
P355N and P355NH have a 100% composition overlap. For most purposes, they can be considered similar.
Can I replace P355N with P355NH?
In many cases, yes. The compositions overlap significantly (100%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between P355N and P355NH?
The main differences are in the following elements: overall alloying content. P355N is a Carbon Steel grade, while P355NH 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.