Here is an information I found..
Quote:
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A method for producing a wear-resistant apex seal of a Wankel type rotary engine, comprising the steps of spraying an atomized self-fluxing alloy comprising a base alloy selected from the group consisting of nickel based alloy, nickel-chrome based alloy, and cobalt-chrome-molybdenum-iron based alloy and at least one self-fluxing component selected from the group consisting of boron and silicon on at least a portion of a base metal selected from a group consisting of soft steel, structural steel, cast iron, cast steel, copper, a copper alloy and Monel metal for forming a coating thereon, fusing said coating at a temperature ranging from about 1,050°C to about 1,250°C, and subsequently heating said coating at a temperature of about 570°C. in the presence of a bath of molten potassium cyanate for a period of time from about 60 to about 120 minutes for forming an outer layer of metal nitride...... in which said coating is about 0.3 to 1.0 mm thick.
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So, 0.3mm is about 0.011inches.. So, I guess if you don't cut more than that, then you still have coating on the irons...