Chemically passivating oil-hardening tool steel 3

[prdave00]

Any thoughts on whether chemically passivating type O1 would be of any benefit or be detrimental? The treatment proposed is equivalent to ASTM A967 Nitric 2 - the more aggressive of the nitric treatments. I'm thinking it won't have any positive effects (unless it does indeed remove iron surface contaminants from the fabrication process) and therefor not be cost effective. I don't have a sense of whether it will be destructive and ruin the highly toleranced parts.

 

[TVP]

It will be destructive to non-stainless steels, especially one with precision tolerances.

 

[EdStainless]

It would roughen surfaces and not improve corrosion resistance.
Don't do it.

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Plymouth Tube

 

[blacksmith37]

And, depending on hardness , you may hydrogen stress crack them . I once saw hunderds of small O-1 parts (HRC 60) cracked by an HCl "cleaning".