ASTM A572 Grade 50 vs P235GH: 68% composition overlap. Moderate differences, generally not direct substitutes.
ASTM A572 Grade 50 vs P235GH
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.
P235GH
1.0345
Lowest-strength pressure vessel steel — ReH >=235 MPa. Excellent weldability due to very low C (max 0.16%). THE entry-level boiler/pressure vessel plate in EN 10028-2. Used for low-pressure vessels, boiler drums, heat exchangers, and steam piping at modest pressures and temperatures to ~400°C.
| ASTM A572 Grade 50 | P235GH | |
|---|---|---|
| Material Number | — | 1.0345 |
| Category | Carbon Steel | Carbon Steel |
| Standard | ASTM A572 | EN 10028-2 |
Chemical composition (wt%)
| Element | ASTM A572 Grade 50 | P235GH | Overlap |
|---|---|---|---|
| C | 0–0.23% | 0–0.16% | OK |
| Si | 0–0.4% | 0–0.35% | OK |
| Mn | 0–1.35% | 0–1.2% | OK |
| P | 0–0.04% | 0–0.025% | OK |
Mechanical properties
| Property | ASTM A572 Grade 50 | P235GH | Unit |
|---|---|---|---|
| tensile_strength | ≥ 450 | 360–480 | MPa |
| yield_strength | ≥ 345 | ≥ 235 | MPa |
| elongation | ≥ 18 | ≥ 25 | % |
Compatibility Assessment
ASTM A572 Grade 50 and P235GH have moderate differences (68% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is ASTM A572 Grade 50 the same as P235GH?
ASTM A572 Grade 50 and P235GH have a 68% composition overlap. They are generally not directly interchangeable.
Can I replace ASTM A572 Grade 50 with P235GH?
Generally not recommended. The compositions differ significantly (68% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between ASTM A572 Grade 50 and P235GH?
The main differences are in the following elements: overall alloying content. ASTM A572 Grade 50 is a Carbon Steel grade, while P235GH is a Carbon Steel grade.
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