Looking at NACE MR0175 Second Edition 2009-10-15, section A.1.5.1, Requirements for overlays, surface treatments, plating, coatings, linings, ect...
It it says, "Nitriding with a maximum case depth of 0.15 mm (0.006 in) is an acceptable surface treatment."
I would think the metal would have...
I am trying to find yield strength and ultimate strength for 4130 steel at Rockwell C 30 to 35. I have an old design that I need to replicate for a much lower strength quickly, and need to verify if the advantage of the heat treatment for hardening is really required for my new application.