Hardfacing vs. Nitriding

[michaelp8]

Hi all, I have a few questions regarding Nitriding and Hardfacing.

First, I am under the impression that Nitiriding does not add a layer of metal over the original piece but rather just uses nitrogen to make the outside of the piece stronger. Is this correct?

Second, Hardfacing is a process by which you add a stronger material onto the piece. Is this correct?

Third, is it possible to nitride a piece with another material such as tungsten carbide or stellite or is that considered hardfacing?

Lets assume the "piece" is 4130 or 410

Thanks for the help.

MP

 

[swall]

Nitriding uses ammonia gas or a salt bath at a temperature in the range of 1000F to build a layer of iron nitride into the original steel surface. This is accomplished by diffusion and is relatively slow. There is some growth as the nitride layer is formed. Hardfacing applies a variety of hard metal or ceramic or both materials onto the room temperature metal substrate. This is accomplished by melting the hard facing material and applying it as a weld deposit or as a spray of atomized molten particles. The objective of nitriding is to provide a hard layer; the objective of hard facing is similar, but can also incorporate other attributes, such as corrosion resistance.

 

[michaelp8]

Thanks for the reply. It seems you are confirming my original thoughts.

MP

 

[arunmrao]

michaelp8,

Hardfacing will definitely provide a better wear surface.I hope your concerns are towards improving wear life and corrosion resistance is not a priority. If you can explain the application, better suggestions might emerge.

 

[arunmrao]

michaelp8,

Hardfacing will definitely provide a better wear surface.I hope your concerns are towards improving wear life and corrosion resistance is not a priority. If you can explain the application, better suggestions might emerge.