P355NL1 vs S355M: 71% composition overlap. Some similarities but notable differences in alloying elements.
P355NL1 vs S355M
Side-by-side chemical composition and mechanical property comparison.
Overview
P355NL1
1.0566
Weldable fine-grained non-alloy steel for pressure vessels with minimum yield strength 355 MPa and impact testing at -40°C (NL1 designation). Low-temperature variant of P355NH for applications requiring guaranteed toughness at sub-zero temperatures. Used for cryogenic storage vessels, LNG/LPG tanks, and pressure equipment operating in cold environments. Equivalent to ASTM A737 Grade B.
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.
| P355NL1 | S355M | |
|---|---|---|
| Material Number | 1.0566 | 1.8823 |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10028-3 | EN 10025-4 |
Chemical composition (wt%)
| Element | P355NL1 | S355M | Overlap |
|---|---|---|---|
| C | ≤ 0.18% | ≤ 0.16% | OK |
| Si | ≤ 0.5% | ≤ 0.55% | OK |
| Mn | 1.1–1.7% | ≤ 1.6% | Partial |
| P | ≤ 0.025% | ≤ 0.035% | OK |
Mechanical properties
| Property | P355NL1 | S355M | Unit |
|---|---|---|---|
| tensile_strength | 490–630 | 450–610 | MPa |
| yield_strength | ≥ 355 | ≥ 355 | MPa |
| elongation | ≥ 22 | ≥ 22 | % |
Compatibility Assessment
P355NL1 and S355M share some characteristics (71% 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 P355NL1 the same as S355M?
P355NL1 and S355M have a 71% composition overlap. For most purposes, they can be considered similar.
Can I replace P355NL1 with S355M?
In many cases, yes. The compositions overlap significantly (71%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between P355NL1 and S355M?
The main differences are in the following elements: Mn. P355NL1 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.