P355NH vs P355NL1: 100% composition overlap. Very similar materials, likely interchangeable for most applications.
P355NH vs P355NL1
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.
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.
| P355NH | P355NL1 | |
|---|---|---|
| Material Number | 1.0565 | 1.0566 |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10028-3 | EN 10028-3 |
Chemical composition (wt%)
| Element | P355NH | P355NL1 | 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 | P355NH | P355NL1 | Unit |
|---|---|---|---|
| tensile_strength | 490–630 | 490–630 | MPa |
| yield_strength | ≥ 355 | ≥ 355 | MPa |
| elongation | ≥ 22 | ≥ 22 | % |
Compatibility Assessment
P355NH and P355NL1 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 P355NH the same as P355NL1?
P355NH and P355NL1 have a 100% composition overlap. For most purposes, they can be considered similar.
Can I replace P355NH with P355NL1?
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 P355NH and P355NL1?
The main differences are in the following elements: overall alloying content. P355NH is a Carbon Steel grade, while P355NL1 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.