Nitriding steel

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A nitriding steel ( EN 10085, formerly DIN 17 211) is a heat-treated steel , which with elements such as chromium (Cr), molybdenum (Mo), or aluminum is alloyed (Al).

These elements, which are very good nitride formers, give it a very high surface hardness with good wear resistance after nitriding . From a chemical point of view, the term nitriding steel is incorrect, as this term refers to a very similar sounding, but chemically different process, nitriding .

Due to the thermal stability of nitrides it is up to 400 ° C resistant to tempering .

Use of nitriding steels

Nitriding steels are used wherever very hard and wear-resistant steels are required due to extreme loads. The core is also extremely tough. In addition, the nitrided layers have a low coefficient of friction and increased corrosion resistance.

The scope of application is carefully checked in practice, as the production of nitriding steels is very expensive due to the many processing stages.

Typical nitriding steels

No. (DIN EN 10027 - replacement for DIN 17007) designation Carbon content Alloy components
1.8515 31CrMo12 0.28-0.35% 2.8-3.3% chromium (Cr), 0.3-0.5% molybdenum (Mo)
1.8519 31CrMoV9 0.26-0.34% 2.3–2.7% chromium (Cr), 0.15–0.25% molybdenum (Mo), 0.1–0.2% vanadium (V)
1.8507 34CrAlMo5 0.30-0.37% 1.0–1.3% chromium (Cr), 0.8–1.2% aluminum (Al), 0.15–0.25% molybdenum (Mo)


See machinability of steel .