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May 23, 2017· I doubt is yourmilltable is "plain" castiron. It's more likely one of the harder alloys in a large family of cast irons the recipes for which fill a thick red book to be found in every metallurgist's personal library. ASM Specialty Handbook: Cast Irons - Google Books I seem to recall "Meehanite" is a proprietaryprocess, not a specific alloy.