ASTM A572 Grade 50 vs C35E: 47% composition overlap. Significantly different materials serving different application areas.
ASTM A572 Grade 50 vs C35E
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.
C35E
1.1181
Mid-carbon unalloyed Q&T steel — 0.32-0.39% C. Good balance between strength and toughness/weldability. Modern designation for Ck35. Used for moderately loaded shafts, axles, bolts, connecting rods, and machine parts where C45 would be too hard and C22E too soft. Also suitable for surface hardening (flame/induction) to HRC 50-55.
| ASTM A572 Grade 50 | C35E | |
|---|---|---|
| Material Number | — | 1.1181 |
| Category | Carbon Steel | Carbon Steel |
| Standard | ASTM A572 | EN 10083-2 |
Chemical composition (wt%)
| Element | ASTM A572 Grade 50 | C35E | Overlap |
|---|---|---|---|
| C | 0–0.23% | 0.32–0.39% | No overlap |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0–1.35% | 0.5–0.8% | OK |
| P | 0–0.04% | 0–0.025% | OK |
Mechanical properties
| Property | ASTM A572 Grade 50 | C35E | Unit |
|---|---|---|---|
| tensile_strength | ≥ 450 | 630–780 | MPa |
| yield_strength | ≥ 345 | 370–460 | MPa |
| elongation | ≥ 18 | 17–22 | % |
Compatibility Assessment
ASTM A572 Grade 50 and C35E have significantly different compositions (47% 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 C35E?
ASTM A572 Grade 50 and C35E have a 47% composition overlap. They are generally not directly interchangeable.
Can I replace ASTM A572 Grade 50 with C35E?
Generally not recommended. The compositions differ significantly (47% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between ASTM A572 Grade 50 and C35E?
The main differences are in the following elements: C. ASTM A572 Grade 50 is a Carbon Steel grade, while C35E is a Carbon Steel grade.
Related Comparisons
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Data provided for reference only. Always verify against the applicable specification for critical applications.
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