A very hard tool steel will probably register about 70 on the what scale?

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Rockwell C scale
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What is the Rockwell Hardness for D2 tool steel?

D-2 is a tool steel that is supplied in the annealed or soft condition. This grade must be hardened after machining . D-2 is heat treated between 1825 to 1875F. After heat tre

A metal used in very hard steels?

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