Dear Colleagues.

Thank you very much for opinion in advance.

Regards, Ali

I think the upper limit for the Rockwell C  hardness scale  = 65 HRc depend on the ASTM standard:

(ASTM E18 Standard Method for Rockwell Hardness.

HRC, conical diamond indenter, 150kg load

65+ is the maximum reading for this range.)

Please, Can I get  the primary reference for this above information?

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