Nitrocarborizing and carbonitrorizing for Steels 1

[LCform]

Hi All

I would like to know if the two types of Nitrocarborizing and carbonitrorizing are always applicable for Steels or there are sometimes preferance of one over the other ?

is Nitrocarborizing lways a better choice ?

 

[EdStainless]

These process are alloy and application specific. There are some cases where they would be interchangeable, but not usually.

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P.E. Metallurgy, Plymouth Tube

 

[LCform]

the material is C45 , and it only has to become as hard as possible, someone said to me carbonitrorizing is the only way but I think it's not true , shall you elaborate please , at the moment Tribology is not the objective , but I need some more to know

 

[Lyrl]

Nitrocarburizing is a (comparatively) low-temperature process that results in a very shallow layer (~.005") on the surface becoming very hard (>60 HRC)

Carbonitriding is a higher temperature process (with the associated extra distortion) that results in a shallow layer (~.020") on the surface becoming hard (~50-55 HRC).

With both processes the core of the material will stay soft.

The cycle times with both processes can be adjusted to make the case depth somewhat shallower or deeper, though of course the vendor will charge more for the extra time required for deeper depths.

 

[tbuelna]

I believe you can use liquid salt bath nitrocarburize (AMS 2753) on C45 steel. It is performed at temps around 1060degF and no quench is required. To get optimum core strength you can quench and temper your part at a temperature just above the nitrocarburize process temperature. The nitrocarburize case is hard but fairly shallow. But since no quench is required there is virtually no distortion produced by the process.

One nice thing with this process is that after the initial nitrocarburize treatment, the part surfaces can be polished and given a second treatment which provides excellent corrosion resistance.

 

[mfgenggear]

it depends on the the manufacturing method, and what the application of the part. simple pin vs a gear shaft.
My opinion, nitriding or carburizing are better process.

each has it's caveats,