C40E
1.1186Mid-carbon unalloyed Q&T steel — 0.37-0.44% C. Slightly below C45E in carbon content but very similar properties. Modern designation for Ck40. Used for crankshafts, connecting rods, axles, bolts, and machine parts. Suitable for flame/induction hardening to HRC 52-56.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 1040 | — | REF |
| 🇪🇺 | EN | Europe | C40E / 1.1186 | 1.1186 | 100% |
Sources: ASTM A29, EN 10083-2
Chemical composition comparison (wt%)
Side-by-side: C40E (EN 10083-2) vs C40E / 1.1186 (EN) (EN 10083-2)
| Element | C40E (EN 10083-2) | C40E / 1.1186 (EN) | Overlap |
|---|---|---|---|
| C | — | 0.37–0.44% | — |
| Si | — | 0–0.4% | — |
Mechanical properties
Compatibility verdict
C40E and C40E / 1.1186: 100% composition match
Related materials
C45
1.0503Medium carbon unalloyed quality steel. Good machinability and moderate strength after heat treatment. Widely used for shafts, spindles, pins, studs, and general machine parts.
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).
S235JR
1.0038General-purpose structural steel with minimum yield strength of 235 MPa. The most common structural steel grade in Europe for general construction, frames, and non-critical structural applications.
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