Hmmm, I'm not familiar with EN39B. How does EN39B differ from EN40B (or it's .mil equivalent 722M24)?
When you say .040" case hardening I assume you mean case depth (50 HRC?)? Therefore case hardening is carburizing or possibly carbo-nitriding?
Have you considered EN40B and nitriding? Another alternative would be A2 tool steel. I have a friend making cams out of that now.
Can you do custom grinds?
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