MartinensiticStainlessSteelsChart.pdf
| 400 Series Martensitic Stainless Steels | Grade | C | Mn | Si | Cr | Ni | Mo | P | S | Comments/Applications |
| 410 | 0.15 | 1.0 | 0.5 | 11.5-13.0 | – | – | 0.04 | 0.03 | The basic composition. Used for cutlery, steam and gas turbine blades and buckets, bushings… |
| 416 | 0.15 | 1.25 | 1.0 | 12.0-14.0 | – | 0.60 | 0.04 | 0.15 | Addition of sulphur for machinability, used for screws, gears etc. 416 Se replaces sulphur by selenium. |
| 420 | 0.15-0.40 | 1.0 | 1.0 | 12.0-14.0 | – | – | 0.04 | 0.03 | Dental and surgical instruments, cutlery…. |
| 431 | 0.20 | 1.0 | 1.0 | 15.0-17.0 | – | 1.25-2.0 | 0.04 | 0.03 | Enhanced corosion resistance, high strength. |
| 440A | 0.60-0.75 | 1.0 | 1.0 | 16.0-18.0 | – | 0.75 | 0.04 | 0.03 | Ball bearings and races, gauge blocks, molds and dies, cutlery. |
| 440B | 0.75-0.95 | 1.0 | 1.0 | 16.0-18.0 | – | 0.75 | 0.04 | 0.03 | As 440A, higher hardness |
| 440C | 0.95-1.20 | 1.0 | 1.0 | 16.0-18.0 | – | 0.75 | 0.04 | 0.03 | As 440B, higher hardness |