C45 vs C80: 55% composition overlap. Moderate differences, generally not direct substitutes.
C45 vs C80
Side-by-side chemical composition and mechanical property comparison.
Overview
C45
1.0503
Medium carbon unalloyed quality steel. Good machinability and moderate strength after heat treatment. Widely used for shafts, spindles, pins, studs, and general machine parts.
C80
1.0609
Highest-carbon standard unalloyed spring steel. 0.75-0.85% C gives maximum hardness (60+ HRC) among unalloyed grades but with increased brittleness. Limited hardenability — effective quench diameter ≤10mm. Used for high-hardness springs, saw blades, scrapers, and precision strip where maximum elastic limit is needed. ≈ AISI 1080.
| C45 | C80 | |
|---|---|---|
| Material Number | 1.0503 | 1.0609 |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10083-2 | EN 10132-4 |
Chemical composition (wt%) — Pro
| Element | C45 | C80 | Overlap |
|---|---|---|---|
| C | 0.42–0.5% | 0.75–0.85% | No overlap |
| Si | 0–0.4% | 0.15–0.4% | OK |
| Mn | 0.5–0.8% | 0.6–0.9% | Partial |
| P | 0–0.03% | 0–0.025% | OK |
| S | |||
| Cr | |||
| Mo | |||
| Ni |
Sign up free and get 3 full comparisons immediately.
Sign up free — 3 comparisons/day freeMechanical properties — Pro
| Property | C45 | C80 | Unit |
|---|---|---|---|
| Tensile Strength | 630–780 | 900–1200 | MPa |
| Yield Strength | ≥ 370 | 550–750 | MPa |
| Elongation | ≥ 16 | 6–10 | % |
| Hardness HB | |||
| Elastic Modulus | |||
| Density |
Sign up free and get 3 full comparisons immediately.
Sign up free — 3 comparisons/day freeCompatibility Assessment
C45 and C80 have moderate differences (55% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is C45 the same as C80?
C45 and C80 have a 55% composition overlap. They are generally not directly interchangeable.
Can I replace C45 with C80?
Generally not recommended. The compositions differ significantly (55% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between C45 and C80?
The main differences are in the following elements: C, Mn. C45 is a Carbon Steel grade, while C80 is a Carbon Steel grade.
Related Comparisons
View full data for each material:
Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.