Support BladeForums! Paid memberships don't see ads! Now that S30V is so commonly used, is any one still using S90V? I know that one of the drawbacks of heat treating this steel is the need for higher austinizing temps ( 2050 - 2100 F ). Paul Bos could only get the steel up to HRC 57-58, while people like Phil Wilson were using it at HRC 60. So, is it ok at 57-58, or who would be reccomended to heat treat it to rc 60. I talked to one of the metallergist at Crucible, a long time ago, and she said that to get high hardness that oil quenching or salt quenching was needed. S90V at HRC 60 sounds very good for a folder. Any thoughts on this?