| Ф2.0 | Ф2.5 | ФЗ.0 | ФЗ.1 | Ф3.2 | Ф3.5 | Ф4.0 | Ф4.05 | Ф4.5 | Ф5.0 |
| Ф5.05 | Ф5.5 | Ф6.0 | Ф6.05 | Ф6.35 | Ф6.5 | Ф7.0 | Ф7.5 | Ф8.0 | Ф8.05 |
| Ф8.5 | Ф9.0 | Ф9.5 | Ф10 | Ф10.5 | Ф11 | Ф12 | Ф12.05 | Ф12.5 | Ф13 |
| Ф14 | Ф14.5 | Ф15 | Ф16 | Ф17 | Ф18 | Ф19 | Ф20 | Ф20.5 | Ф21 |
| Ф22 | Ф23 | Ф24 | Ф25 | Ф26 | Ф27 | Ф28 | Ф29 | Ф30 |
| Ф2.0+ | Ф2.5 | Ф3.0 | Ф3.5 | Ф4.0 | Ф4.5 | Ф5.0 | Ф6.0 | Ф7.0 | Ф7.5 |
| Ф8.0 | Ф8.5 | Ф9.0 | Ф10 | Ф11 | Ф12 | Ф12.5 | Ф13 | Ф14 | Ф15 |
| Ф16 | Ф17 | Ф18 | Ф19 | Ф20 | Ф20.5 | Ф21 | Ф22 | Ф23 | Ф24 |
| Ф25 | Ф26 | Ф27 | Ф28 | Ф29 | Ф30 | Ф32 | Ф34 | Ф35 | Ф36 |
| Ф38 | Ф40 | Ф42 | Ф45 | Ф46 | Ф48 | Ф50 | Ф52 | Ф55 | Ф60 |
Alloy 420F is a free-machining, hardenable martensitic stainless steel known for its high hardness and good corrosion resistance. With 0.28-0.38% carbon and 15-17% chromium, it offers excellent wear properties after heat treatment, achieving up to 55 HRC. Commonly used for pump shafts, gears, cams, and valve parts, 420F is easy to machine, grind, and polish. However, it is not recommended for high-pressure gas or liquid vessels, nor for applications requiring a high mirror finish, such as plastic mold cavities. It is superior to 410 and 416 in most applications.
| CHINA | U.S.A | GERMANY | JAPAN | |
| Y30Cr13 | UNS S42020 | WS 1.4104 | JIS SUS420F | |
| AISI 420F | X20CrMoS13 |
| C | SI | Mn | P | S | Cr | Fe | Se | Ni | Mo |
| ≤0.40 | ≤1.00 | ≤1.25 | ≤0.06 | 0.03 | 12.00-14.00 | Bal | 0.18-0.35 | ≤0.10 | 0.60 |