ASTM A572 Grade 50 vs C75: 37% composition overlap. Significantly different materials serving different application areas.
ASTM A572 Grade 50 vs C75
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.
C75
1.0605
High-carbon unalloyed spring steel. Near-eutectoid composition (0.70-0.80% C). Excellent elastic properties after hardening and tempering. Limited hardenability — effective oil quench diameter ≤12mm. Cost-effective for small/medium springs. Used for spring wire, clock springs, saw blades, retaining rings, and precision strip springs. ≈ AISI 1075.
| ASTM A572 Grade 50 | C75 | |
|---|---|---|
| Material Number | — | 1.0605 |
| Category | Carbon Steel | Carbon Steel |
| Standard | ASTM A572 | EN 10132-4 |
Chemical composition (wt%)
| Element | ASTM A572 Grade 50 | C75 | Overlap |
|---|---|---|---|
| C | 0–0.23% | 0.7–0.8% | No overlap |
| Si | 0–0.4% | 0.15–0.35% | OK |
| Mn | 0–1.35% | 0.6–0.9% | OK |
| P | 0–0.04% | 0–0.025% | OK |
Mechanical properties
| Property | ASTM A572 Grade 50 | C75 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 450 | 850–1100 | MPa |
| yield_strength | ≥ 345 | 500–700 | MPa |
| elongation | ≥ 18 | 8–12 | % |
Compatibility Assessment
ASTM A572 Grade 50 and C75 have significantly different compositions (37% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is ASTM A572 Grade 50 the same as C75?
ASTM A572 Grade 50 and C75 have a 37% composition overlap. They are generally not directly interchangeable.
Can I replace ASTM A572 Grade 50 with C75?
Generally not recommended. The compositions differ significantly (37% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between ASTM A572 Grade 50 and C75?
The main differences are in the following elements: C. ASTM A572 Grade 50 is a Carbon Steel grade, while C75 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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