I use inserts for aluminum all the time , and I was told that there is a different grade of carbide for aluminum versus steel , but there is also a different finish to them . The aluminum ones I use have a high gloss / chrome looking finish to them , and any steel ones I have used are the dull gray - looking carbide . The high sheen on the aluminum inserts is supposed to , and does , keep the aluminum from gumming up so bad on the cutter . I have tried using them on steel because my boss didn't believe there was a difference either , and the inserts got destroyed on the steel and it was just mild cold rold . Hope this helps , any actual data needed about the type of carbide used should be able to be found from the person your buying them from .
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