Nitriding
Gas nitriding is a thermochemical process where nitrogen is introduced into the surface of ferrous alloys by holding the metals at a suitable temperature in contact with a nitrogenous gas, usually ammonia. Nitriding temperature for steels is between 510 oC and 540 oC.
General Advantages
- Significantly increases wear resistance
- Improves fatigue life
- Freedom from galling and seizing
- Improves corrosion resistance (except for stainless steels)
- A surface that is resistant to softening at temperature up to the nitriding temperature
- No significant dimensional change
Special Advantages
- High surface hardness
- Case Depth up to 0.762mm
Generally, the use of nitrocarburising and gas nitriding are similar and at times identical. Applications range from gears, crankshafts and piston rings to drills and die casting dies/. Gas nitriding may be preferred where heavier case depths combined with greater surface are required. Gas nitriding has been particulars successful in the tool ad die field for hot forging dies where improvements of up to 100 % in die life have been obtained. However nitrocarburising produces a tough case and is unique in its ability to produce a satisfactory nitriding case on carbon steels. Outstanding results have been achieved with this process on die casting tools.
Gas nitriding is carried out in our Huppert nitriding furnace.
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