ASTM A572 Grade 50 vs S690Q: 57% composition overlap. Moderate differences, generally not direct substitutes.
ASTM A572 Grade 50 vs S690Q
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.
S690Q
1.8928
High-strength quenched and tempered structural steel — YS 690 MPa min. Part of EN 10025-6 series (S500Q to S960Q). Good weldability despite high strength (CEV controlled). Used for mobile cranes, mining equipment, truck chassis, bridge components, and any structure where weight reduction through higher strength is critical. "Q" = quenched, "L" variants add low-temp impact.
| ASTM A572 Grade 50 | S690Q | |
|---|---|---|
| Material Number | — | 1.8928 |
| Category | Carbon Steel | Carbon Steel |
| Standard | ASTM A572 | EN 10025-6 |
Chemical composition (wt%)
| Element | ASTM A572 Grade 50 | S690Q | 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 | S690Q | Unit |
|---|---|---|---|
| tensile_strength | ≥ 450 | 770–940 | MPa |
| yield_strength | ≥ 345 | ≥ 690 | MPa |
| elongation | ≥ 18 | ≥ 14 | % |
Compatibility Assessment
ASTM A572 Grade 50 and S690Q have moderate differences (57% 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 S690Q?
ASTM A572 Grade 50 and S690Q have a 57% composition overlap. They are generally not directly interchangeable.
Can I replace ASTM A572 Grade 50 with S690Q?
Generally not recommended. The compositions differ significantly (57% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between ASTM A572 Grade 50 and S690Q?
The main differences are in the following elements: overall alloying content. ASTM A572 Grade 50 is a Carbon Steel grade, while S690Q is a Carbon Steel grade.
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