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I'm no machinist but I do know that steel will turn blue if using a cuttoff wheel and it sits in one place too long and overheats the metal. Maybe not with stainless.
Stainless will discolour, though not usually blue. It will be OK if cut slowly with a minumum of pressure and frequent stops for a gulp of 'The One and Only'.
If the cutoff tool is run on air or is double insulated, a slow dribble of water to keep the metal cool helps.
Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python
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