ASTM A36 vs C55E: 48% composition overlap. Significantly different materials serving different application areas.
ASTM A36 vs C55E
Side-by-side chemical composition and mechanical property comparison.
Overview
ASTM A36
K02600
The most common structural carbon steel in the US. Low carbon content with good weldability and machinability. Used for buildings, bridges, construction equipment, and general structural purposes. Minimum yield strength 36 ksi (250 MPa).
C55E
1.1203
High-carbon unalloyed Q&T steel — 0.52-0.60% C. Modern designation for Ck55. Good strength after Q&T (UTS 800-950 MPa) and excellent surface hardness after induction hardening (HRC 56-60). Used for rail wheels, crankshafts, heavy-duty shafts, and wear parts.
| ASTM A36 | C55E | |
|---|---|---|
| Material Number | K02600 | 1.1203 |
| Category | Carbon Steel | Carbon Steel |
| Standard | ASTM A36/A36M | EN 10083-2 |
Chemical composition (wt%)
| Element | ASTM A36 | C55E | Overlap |
|---|---|---|---|
| C | 0–0.26% | 0.52–0.6% | No overlap |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0–1.03% | 0.6–0.9% | OK |
| P | 0–0.04% | 0–0.025% | OK |
Mechanical properties
| Property | ASTM A36 | C55E | Unit |
|---|---|---|---|
| tensile_strength | 400–550 | 800–950 | MPa |
| yield_strength | ≥ 250 | 500–600 | MPa |
| elongation | ≥ 20 | 12–16 | % |
Compatibility Assessment
ASTM A36 and C55E have significantly different compositions (48% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is ASTM A36 the same as C55E?
ASTM A36 and C55E have a 48% composition overlap. They are generally not directly interchangeable.
Can I replace ASTM A36 with C55E?
Generally not recommended. The compositions differ significantly (48% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between ASTM A36 and C55E?
The main differences are in the following elements: C. ASTM A36 is a Carbon Steel grade, while C55E 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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