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Steel designation

Steel designation

Steel designation

(OP)
We are being asked to supplied a machined part with a material specification of MO1 (or maybe M01?) tool steel.  We are familiar with M1 and O1 steels but, not MO1.  Any ideas if MO1 is (or was) a legitimate designation?

RE: Steel designation

Maybe its a typo and should read 'M10'?

RE: Steel designation

or did they put in "zero one" because they thought that it should be a two digit number.

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