1.4122 (X39CrMo17-1) steel is a martensitic stainless steel.the 1.4122 (X39CrMo17-1) steel material is characterized by high hardness, wear resistance, and corrosion resistance. Additionally, due to its suitability for high-temperature use, it is used in equipment exposed to heat. The 1.4122 (X39CrMo17-1) material is also suitable for various mechanical processes like CNC machining, milling, and other machining operations due to its machinability.
The 1.4122 stainless steel grade is applied in the food and medical industries This 1.4122 level is used for surgical instruments such as knives, tableware, and surgical blades It is also used for plastic molds that require wear resistance, such as slides, injection nozzles, and extrusion screws，also be used to manufacture tools for cutting wood or metal, such as carving and cutting tools, turning tools, and milling cutters.
Chemical composition % of steel X39CrMo17-1 (1.4122): EN 10088-2-2005
| C | Si | Mn | Ni | P | S | Cr | Mo |
| 0.33 – 0.45 | max 1 | max 1.5 | max 1 | max 0.04 | max 0.015 | 15.5 – 17.5 | 0.8 – 1.3 |
| Rm – Tensile strength (MPa) (+A) | 900 |
| Rm – Tensile strength (MPa) (+QT750) | 750-950 |
| Rp0.2 0.2% proof strength (MPa) +QT750 | 550 |
| KV – Impact energy (J) longitud., (+QT) | +20° 14-20 |
| A – Min. elongation at fracture (%) (+A) | 12 |
| Brinell hardness (HB): (+A) | 280 |
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