C15E
1.1141Low-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.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 1015 | — | REF |
| 🇪🇺 | EN | Europe | C15E / 1.1141 | 1.1141 | 100% |
Sources: ASTM A29, EN 10084
Chemical composition comparison (wt%)
Side-by-side: C15E (EN) (EN 10084) vs C15E / 1.1141 (EN) (EN 10084)
| Element | C15E (EN) | C15E / 1.1141 (EN) | Overlap |
|---|---|---|---|
| C | 0.12–0.18% | 0.12–0.18% | OK |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.3–0.6% | 0.3–0.6% | OK |
| P | 0–0.025% | 0–0.025% | OK |
| S | 0–0.025% | 0–0.025% | OK |
Mechanical properties
Normalized
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 350–490 | MPa |
| Yield Strength | 210–260 | MPa |
| Elongation | 25–32 | % |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Case Hardened
| Property | Value | Unit |
|---|---|---|
| Hardness HRC | 58–62 | HRC |
Compatibility verdict
C15E and C15E / 1.1141: 100% composition match
Close equivalents but NOT identical.
Related materials
S355JR
1.0045High-strength low-alloy structural steel with minimum yield strength of 355 MPa. Standard grade for bridges, buildings, cranes, and general structural applications. Impact tested at +20°C (JR).
S690QL
1.8928High-strength quenched and tempered fine-grain structural steel with minimum yield strength of 690 MPa. Used for heavily loaded structures like mobile cranes, mining equipment, bridges, and pressure vessels.
S275JR
1.0044Medium-strength structural steel with minimum yield strength of 275 MPa. Bridges the gap between S235JR and S355JR. Used for general structural applications, lattice towers, masts, and light crane components. Impact tested at +20°C (JR).
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