I was a diemaker and we used h13 only for our dies. It is very heat resistant but even worse is the shock resistance. We made transmission cases among other items and would shoot a 50 pound aluminum pour at about 1500 feet peer second at 1296 degrees. the h13 would literally take thousands of shots before showing wear or washout. What you end up using is a metal that needs high temps to make it workable and then it is still really tough. The good part of that is once made into a tool it will last forever, the bad part is it is a pain to work. I use it for punchs, sliting chisels and cutting tools
