The quenching process of 40 cr

40 to 850 ℃, cr quenching oil cooling; Around 520 ℃ tempering, soon cold.

Surface quenching hardness of HRC52-60, flame quenching can achieve HRC48-55.

40 cr nitriding processing

40 cr are nitrided steel, its elements for nitriding. 40 cr after nitriding treatment can obtain higher surface hardness, 40 cr after quenched and tempered nitriding processing hardness can top HRA72 ~ 78, namely HRC43 ~ 55.

N chemical process routes: forging, annealing - rough machining - conditioning - finishing - in addition to the stress and coarse grinding - nitride - fine grinding and grinding. Because nitride thin and brittle, and therefore requires a higher intensity is the heart of the organization, so need to tempering heat treatment, get tempered sorbite, mechanical properties and nitride layer quality of improving the core. Soft nitriding is reactive nitrogen, is now more commonly used gas nitriding.