P275NH vs S355M: 66% composition overlap. Moderate differences, generally not direct substitutes.
P275NH vs S355M
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.
S355M
1.8823
Thermomechanically rolled weldable fine-grained structural steel with minimum yield strength 355 MPa. The most widely used TMCP structural steel grade. M designation indicates thermo-mechanical control process delivery. Excellent weldability with low carbon equivalent, eliminating preheating in most cases. Used for bridges, offshore structures, cranes, heavy machinery, wind turbine foundations, and structural hollow sections.
| P275NH | S355M | |
|---|---|---|
| Material Number | 1.0487 | 1.8823 |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10028-3 | EN 10025-4 |
Chemical composition (wt%)
| Element | P275NH | S355M | Overlap |
|---|---|---|---|
| C | ≤ 0.16% | ≤ 0.16% | OK |
| Si | ≤ 0.4% | ≤ 0.55% | OK |
| Mn | 0.8–1.5% | ≤ 1.6% | OK |
| P | ≤ 0.025% | ≤ 0.035% | OK |
Mechanical properties
| Property | P275NH | S355M | Unit |
|---|---|---|---|
| tensile_strength | 370–510 | 450–610 | MPa |
| yield_strength | ≥ 275 | ≥ 355 | MPa |
| elongation | ≥ 24 | ≥ 22 | % |
Compatibility Assessment
P275NH and S355M have moderate differences (66% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is P275NH the same as S355M?
P275NH and S355M have a 66% composition overlap. They are generally not directly interchangeable.
Can I replace P275NH with S355M?
Generally not recommended. The compositions differ significantly (66% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between P275NH and S355M?
The main differences are in the following elements: overall alloying content. P275NH is a Carbon Steel grade, while S355M 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.