The steel in question contains C~.1%, W, Mn, Cr, Ni 0.5% each, 0.04%P and .1% S. To surface harden this alloy (no way to change the bulk composition), either carburizing, nitriding or Boronizing should be done. Nitriding is a "no" here, since there is not enough nitro-alloy here. Most Cr and W would be trapped in refractory carbides, but Ni would not be. But to do so, It is required to remove P, S up to some depth. Geometry of the article is unspecified, and so all I have to develop is a conceptual model (rather than physically doing it), without any simulation.
Now, is there any method of Surface-level removal of P and S here? Would heating in non-oxidizing environment with lime powder remove some S? What if I briefly dip the sample in molten calcium?
these are merely some ideas, but what about any exact experiment regarding this?
Hello Sumit. Look at this problem from the side of required hardness or probably wear resistance of article. Such alloy steel will definitely have a large fraction of retained austenite, which will affect mechanical properties. If you will recommend a deep cryogenic treatment (DCT), which is simple in implementation, instead of any additional complicated technologies for P, S mitigation, you will have more success with this problem. Carburizing, nitriding or boronizing will say thanks to you for DCT, especially the first one, as it improves the hardened layer too.
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