Calmax is kinda medium alloy tool steel that has lower alloy amount than A2.
I dont think PM process will benefit much.
I believe it available at most Uddeholm dealer. I have had HT several sample pieces of it 1980 , salt quenched 400F tempered and got 59.5HRC. I alao did some destruction test with the pieces and it is super tough that blows my mind.
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