ASTM A572 Grade 50 vs S690QL: 65% composition overlap. Moderate differences, generally not direct substitutes.
ASTM A572 Grade 50 vs S690QL
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.
S690QL
1.8928
High-strength quenched and tempered fine-grain structural steel with minimum yield strength of 690 MPa. Used for heavily loaded structures like mobile cranes, mining equipment, bridges, and pressure vessels.
| ASTM A572 Grade 50 | S690QL | |
|---|---|---|
| Material Number | — | 1.8928 |
| Category | Carbon Steel | Carbon Steel |
| Standard | ASTM A572 | EN 10025-6 |
Chemical composition (wt%)
| Element | ASTM A572 Grade 50 | S690QL | Overlap |
|---|---|---|---|
| C | 0–0.23% | 0–0.2% | OK |
| Si | 0–0.4% | 0–0.8% | OK |
| Mn | 0–1.35% | 0–1.7% | OK |
| P | 0–0.04% | 0–0.02% | OK |
Mechanical properties
| Property | ASTM A572 Grade 50 | S690QL | Unit |
|---|---|---|---|
| tensile_strength | ≥ 450 | 770–940 | MPa |
| yield_strength | ≥ 345 | ≥ 690 | MPa |
| elongation | ≥ 18 | ≥ 14 | % |
Compatibility Assessment
ASTM A572 Grade 50 and S690QL have moderate differences (65% 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 S690QL?
ASTM A572 Grade 50 and S690QL have a 65% composition overlap. They are generally not directly interchangeable.
Can I replace ASTM A572 Grade 50 with S690QL?
Generally not recommended. The compositions differ significantly (65% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between ASTM A572 Grade 50 and S690QL?
The main differences are in the following elements: overall alloying content. ASTM A572 Grade 50 is a Carbon Steel grade, while S690QL is a Carbon Steel grade.
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Data provided for reference only. Always verify against the applicable specification for critical applications.
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