ASTM A572 Grade 50 vs P355GH: 75% composition overlap. Some similarities but notable differences in alloying elements.
ASTM A572 Grade 50 vs P355GH
Side-by-side chemical composition and mechanical property comparison.
Overview
ASTM A572 Grade 50
The most widely used structural steel grade in the United States. 345 MPa (50 ksi) yield strength HSLA steel. Has largely replaced A36 for structural applications due to higher strength-to-weight ratio. Used for building frames, bridges, heavy equipment, and general structural fabrication.
P355GH
1.0473
Higher-strength pressure vessel steel — ReH >=355 MPa, guaranteed elevated-temperature properties. Between P265GH and 16Mo3 in the pressure vessel hierarchy. Used for boilers, steam drums, heat exchangers, and pressure piping operating to ~400°C. EN 10028-2, PED 2014/68/EU compliant. Good weldability.
| ASTM A572 Grade 50 | P355GH | |
|---|---|---|
| Material Number | — | 1.0473 |
| Category | Carbon Steel | Carbon Steel |
| Standard | ASTM A572 | EN 10028-2 |
Chemical composition (wt%)
| Element | ASTM A572 Grade 50 | P355GH | Overlap |
|---|---|---|---|
| C | 0–0.23% | 0–0.22% | OK |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0–1.35% | 0–1.6% | OK |
| P | 0–0.04% | 0–0.025% | OK |
Mechanical properties
| Property | ASTM A572 Grade 50 | P355GH | Unit |
|---|---|---|---|
| tensile_strength | ≥ 450 | 490–630 | MPa |
| yield_strength | ≥ 345 | ≥ 355 | MPa |
| elongation | ≥ 18 | ≥ 20 | % |
Compatibility Assessment
ASTM A572 Grade 50 and P355GH share some characteristics (75% 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 ASTM A572 Grade 50 the same as P355GH?
ASTM A572 Grade 50 and P355GH have a 75% composition overlap. For most purposes, they can be considered similar.
Can I replace ASTM A572 Grade 50 with P355GH?
In many cases, yes. The compositions overlap significantly (75%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between ASTM A572 Grade 50 and P355GH?
The main differences are in the following elements: overall alloying content. ASTM A572 Grade 50 is a Carbon Steel grade, while P355GH is a Carbon Steel grade.
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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.