C22E
1.1151Low-carbon unalloyed steel for case hardening and general engineering — 0.17-0.24% C. After carburizing: surface HRC 55-60, soft tough core. Much cheaper than alloy case-hardening steels (16MnCr5, 20MnCr5). Modern designation for Ck22. Used for pins, bolts, levers, lightly loaded gears, and any carburized part where alloy additions are not justified. Also used as cold-heading wire.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 1022 | — | REF |
| 🇪🇺 | EN | Europe | C22E / 1.1151 | 1.1151 | 100% |
Sources: ASTM A29, EN 10083-2
Chemical composition comparison (wt%)
Side-by-side: C22E (EN) (EN 10083-2) vs C22E / 1.1151 (EN) (EN 10083-2)
| Element | C22E (EN) | C22E / 1.1151 (EN) | Overlap |
|---|---|---|---|
| C | 0.17–0.24% | 0.17–0.24% | OK |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.4–0.7% | 0.4–0.7% | 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 | 410–540 | MPa |
| Yield Strength | 240–280 | MPa |
| Elongation | 22–28 | % |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Case Hardened
| Property | Value | Unit |
|---|---|---|
| Hardness HRC | 55–60 | HRC |
Compatibility verdict
C22E and C22E / 1.1151: 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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