C15E vs C75S: 50% composition overlap. Moderate differences, generally not direct substitutes.
C15E vs C75S
Side-by-side chemical composition and mechanical property comparison.
Overview
C15E
1.1141
Low-carbon unalloyed case hardening steel — 0.12-0.18% C. Between C10E (softer core) and C22E (harder core) in the case-hardening range. Good balance of surface hardness (HRC 58-62) and core toughness after carburizing. Modern designation for Ck15. Used for small gears, pins, bushings, levers, and carburized parts where moderate core strength is acceptable. Also used for cold forming and deep drawing.
C75S
1.1248
High-carbon spring strip steel — C 0.70-0.80%. Between C67S (0.65-0.72%) and C85S (0.83-0.90%). Good fatigue strength and edge retention. Used for flat springs, leaf springs, saw blades, snap rings, and reed valves. Available as cold-rolled precision strip in hardened & tempered condition (HRC 58-62).
| C15E | C75S | |
|---|---|---|
| Material Number | 1.1141 | 1.1248 |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10084 | EN 10132-4 |
Chemical composition (wt%)
| Element | C15E | C75S | Overlap |
|---|---|---|---|
| C | 0.12–0.18% | 0.7–0.8% | No overlap |
| Si | 0–0.4% | 0.15–0.35% | OK |
| Mn | 0.3–0.6% | 0.6–0.9% | Partial |
| P | 0–0.025% | 0–0.025% | OK |
Mechanical properties
| Property | C15E | C75S | Unit |
|---|---|---|---|
| tensile_strength | 350–490 | 1250–1500 | MPa |
| yield_strength | 210–260 | 1100–1350 | MPa |
| elongation | 25–32 | 4–7 | % |
Compatibility Assessment
C15E and C75S have moderate differences (50% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is C15E the same as C75S?
C15E and C75S have a 50% composition overlap. They are generally not directly interchangeable.
Can I replace C15E with C75S?
Generally not recommended. The compositions differ significantly (50% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between C15E and C75S?
The main differences are in the following elements: C, Mn. C15E is a Carbon Steel grade, while C75S is a Carbon Steel grade.
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.