| Ф5.0 | Ф5.3 | Ф7.0 | Ф7.2 | Ф8.0 | Ф10 | Ф10.2 | Ф11.2 | Ф12.2 | Ф15.2 |
| Ф16.2 |
| Ф3.3 | Ф4.3 | Ф5.3 | Ф6.3 | Ф7.3 | Ф8.3 | Ф9.3 | Ф10.3 | Ф11.3 | Ф12.1 |
| Ф12.3 | Ф13.3 | Ф14 | Ф14.3 | Ф15 | Ф15.2 | Ф16 | Ф16.3 | Ф17 | Ф17.3 |
| Ф18.3 | Ф19.3 | Ф20.3 | Ф21.3 | Ф22.3 | Ф23.3 | Ф25.3 | Ф26.3 | Ф27 | Ф28.3 |
| Ф30.3 | Ф32.3 | Ф35 | Ф38 | Ф40 | Ф40.3 | Ф42.3 | Ф45 | Ф50 |
Type 440C is a high-carbon chromium martensitic stainless steel known for its exceptional hardness after heat treatment, reaching about 60 HRC. It offers good wear resistance and moderate corrosion resistance, making it ideal for bearing assemblies, including ball bearings, as well as needle and ball check valves. While primarily used in hardened and tempered conditions, its high hardness makes it suitable for applications requiring maximum strength. This material is magnetic and retains its toughness after heat treatment, though it is less suitable for environments with severe corrosion.
| CHINA | U.S.A | GERMANY | JAPAN | |
| 9Cr18Mo | MIL-W 52263 | WS 1.4125 | SUS 440C | |
| AISI 440C | X105CrMo17 |
| C | SI | Mn | P | S | Cr | Fe | Mo | Cu |
| ≤1.20 | ≤1.00 | ≤1.00 | ≤0.04 | 0.03 | 16.00-18.00 | Bal | ≤0.75 | 0.05 |