P275NH vs P355NH: 86% composition overlap. Some similarities but notable differences in alloying elements.
P275NH vs P355NH
Side-by-side chemical composition and mechanical property comparison.
Overview
P275NH
1.0487
Weldable fine-grained non-alloy steel for pressure vessels with minimum yield strength 275 MPa. NH designation indicates normalized condition with impact testing at -20°C. Widely used entry-level pressure vessel grade for boilers, storage tanks, heat exchangers, and pipes transporting hot liquids. Good weldability without preheating for most thicknesses.
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.
| P275NH | P355NH | |
|---|---|---|
| Material Number | 1.0487 | 1.0565 |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10028-3 | EN 10028-3 |
Chemical composition (wt%)
| Element | P275NH | P355NH | Overlap |
|---|---|---|---|
| C | ≤ 0.16% | ≤ 0.18% | OK |
| Si | ≤ 0.4% | ≤ 0.5% | OK |
| Mn | 0.8–1.5% | 1.1–1.7% | Partial |
| P | ≤ 0.025% | ≤ 0.025% | OK |
Mechanical properties
| Property | P275NH | P355NH | Unit |
|---|---|---|---|
| tensile_strength | 370–510 | 490–630 | MPa |
| yield_strength | ≥ 275 | ≥ 355 | MPa |
| elongation | ≥ 24 | ≥ 22 | % |
Compatibility Assessment
P275NH and P355NH share some characteristics (86% overlap) but have notable differences. They may be substitutable in some applications but not all. Verify suitability carefully.
Automated assessment based on composition analysis
Frequently Asked Questions
Is P275NH the same as P355NH?
P275NH and P355NH have a 86% composition overlap. For most purposes, they can be considered similar.
Can I replace P275NH with P355NH?
In many cases, yes. The compositions overlap significantly (86%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between P275NH and P355NH?
The main differences are in the following elements: Mn. P275NH 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.