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) (EN 10083-2) vs C40E / 1.1186 (EN) (EN 10083-2)
| Element | C40E (EN) | C40E / 1.1186 (EN) | Overlap |
|---|---|---|---|
| C | 0.37–0.44% | 0.37–0.44% | OK |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.5–0.8% | 0.5–0.8% | OK |
| P | 0–0.025% | 0–0.025% | OK |
| S | 0–0.025% | 0–0.025% | OK |
Mechanical properties
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 700–850 | MPa |
| Yield Strength | 430–530 | MPa |
| Elongation | 15–19 | % |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| hardening | 830–860 °C | oil/water | — | Oil preferred |
| tempering | 400–600 °C | air | 1-2h | Adjust for target |
Compatibility verdict
C40E and C40E / 1.1186: 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).
Not sure which material fits?
🤖 Ask AI Advisor →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.