Thanks,
I’m not exactly sure where those numbers came from; I believe they were pulled from a previously supplied part of the same material. I pulled the print and it just said “Precipitation harden to achieve Rc 38-42”, but like I said there was a switch from Oil to Air quench before my time...
Anyone with good insight on heat treating investment cast 17-4. Most recipes I’ve looked at, of course, start with the material at Condition A (annealed) from the mill. I’ve also seen the anneal processed outlined, 1950 ± 25°F (1066 ± 14°C) for ½ hr, but is it necessary for cast parts, and how...
