Ck 40 Steel vs Ck 45 Steel ( C40E vs C45E)
| Designation | Ck 40 | Ck 45 |
| Material Number | 1.1186 | 1.1191 |
| German Designations | C40E; Ck 40 | C45E; Ck 45 |
Chemical Composition
| Element | Ck 40 (1.1186) | Ck 45 (1.1191) |
| Carbon (C) | 0.37 – 0.44% | 0.42 – 0.50% |
| Silicon (Si) | ≤ 0.40% | ≤ 0.40% |
| Manganese (Mn) | 0.50 – 0.80% | 0.50 – 0.80% |
| Phosphorus (P) | ≤ 0.030% | ≤ 0.030% |
| Sulfur (S) | ≤ 0.035% | ≤ 0.035% |
| Chromium (Cr) | ≤ 0.40% | ≤ 0.40% |
| Molybdenum (Mo) | ≤ 0.10% | ≤ 0.10% |
| Nickel (Ni) | ≤ 0.40% | ≤ 0.40% |
| (Cr+Mo+Ni) | ≤ 0.63% | ≤ 0.63% |
Mechanical Properties
| Property (Dimension) | Ck 40 (1.1186) | Ck 45 (1.1191) |
| Yield Strength (≤ 16 mm) | ≥ 320 MPa | ≥ 340 MPa |
| Yield Strength (16-100 mm) | ≥ 290 MPa | ≥ 305 MPa |
| Tensile Strength (≤ 16 mm) | ≥ 580 MPa | ≥ 620 MPa |
| Tensile Strength (16-100 mm) | ≥ 550 MPa | ≥ 580 MPa |
| Elongation (A5) (≤ 16 mm) | ≥ 16% | ≥ 14% |
| Elongation (A5) (16-100 mm) | ≥ 17% | ≥ 16% |
Quenched and Tempered Condition
| Property (Dimension) | Ck 40 (1.1186) | Ck 45 (1.1191) |
| Yield Strength (≤ 16 mm) | ≥ 460 MPa | ≥ 490 MPa |
| Yield Strength (16-40 mm) | ≥ 400 MPa | ≥ 430 MPa |
| Tensile Strength (≤ 16 mm) | 650 – 800 MPa | 700 – 850 MPa |
| Tensile Strength (16-40 mm) | 630 – 780 MPa | 650 – 800 MPa |
| Elongation (A5) (≤ 16 mm) | ≥ 16% | ≥ 14% |
| Elongation (A5) (16-40 mm) | ≥ 18% | ≥ 16% |
| Impact Value KV (16-40 mm) | ≥ 30 J | ≥ 25 J |
Soft Annealed Condition
| Property | Ck 40 (1.1186) | Ck 45 (1.1191) |
| Hardness | ≤ 197 HB 30 | ≤ 207 HBW |
Equivalent Standards
| Country/Standard | Ck 40 (1.1186) Equivalents | Ck 45 (1.1191) Equivalents |
| Europe (EN) | C40E | C45E |
| ISO | C40E4 | C45E4 |
| U.S.A. (AISI) | 1040 | 1045 |
| U.S.A. (UNS) | G10400 | G10450 |
| Japan (JIS) | S 40 C | S 45 C |
| China (GB) | 40 | 45 |
| Russia (GOST) | 40 | 45 |
| Great Britain (BS) | 080M40 | 080M46 |
MODULUS METAL
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