I've looked up all the steels in my "Heat treatment, selection, and
application of TOOL STEELS" book. P20 heat treat conditions are given;
harden at 1525 F oil quench. As hardened Rc is listed as 51. The book
also includes a table of tempering results. But no where in the book
is there any info on what application to use this steel for. Any

It"s used as is since it is already heat treated to c28-32 unless its high hard
the it will be inthe high 30s.We cut cores and cavities directly in it.It"s a
good mold steel Ray Mueller