C15E vs S690Q: 44% composition overlap. Significantly different materials serving different application areas.
C15E vs S690Q
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.
S690Q
1.8928
High-strength quenched and tempered structural steel — YS 690 MPa min. Part of EN 10025-6 series (S500Q to S960Q). Good weldability despite high strength (CEV controlled). Used for mobile cranes, mining equipment, truck chassis, bridge components, and any structure where weight reduction through higher strength is critical. "Q" = quenched, "L" variants add low-temp impact.
| C15E | S690Q | |
|---|---|---|
| Material Number | 1.1141 | 1.8928 |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10084 | EN 10025-6 |
Chemical composition (wt%)
| Element | C15E | S690Q | Overlap |
|---|---|---|---|
| C | 0.12–0.18% | 0–0.2% | OK |
| Si | 0–0.4% | 0–0.8% | OK |
| Mn | 0.3–0.6% | 0–1.7% | OK |
| P | 0–0.025% | 0–0.02% | OK |
Mechanical properties
| Property | C15E | S690Q | Unit |
|---|---|---|---|
| tensile_strength | 350–490 | 770–940 | MPa |
| yield_strength | 210–260 | ≥ 690 | MPa |
| elongation | 25–32 | ≥ 14 | % |
Compatibility Assessment
C15E and S690Q have significantly different compositions (44% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is C15E the same as S690Q?
C15E and S690Q have a 44% composition overlap. They are generally not directly interchangeable.
Can I replace C15E with S690Q?
Generally not recommended. The compositions differ significantly (44% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between C15E and S690Q?
The main differences are in the following elements: overall alloying content. C15E is a Carbon Steel grade, while S690Q 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.