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    How to clean the black crust on tool steel hardened parts, after hardening in oil ?

    Hello, I started a CNC business now 7 years ago, in the begining making just Policarbonate and textolite parts, but after a few years I purchased an Tormach Mill, to be able to make cutting dies for leather, I use 1.2379 tool steel for all my cutting dies. For hardening , until now we worked...
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