Abstract
Free-cutting stainless steels have been widely used for high precision equipment. Their good machinability is rendered by Pb and/or MnS dispersed in them. From the viewpoint of health, Pb is an undesirable additive. And MnS deteriorates the corrosion resistance and some fabricabilities. A titanium carbosulfide, Ti4C2S2, is stable thermodynamically more than MnS and so it is a candidate to replace MnS.In order to disperse the sufficient carbosulfides, 0.55%Ti, 0.03%C and 0.2%S were added to a ferritic base steel, Type 430(16.5%Cr), with low O and N both less than 50ppm. The steel showed the good machinability in turning and drilling comparable to Type 430F(0.6%Mn, 0.2S) and besides the excellent corrosion resistance under salt spray superior to Type 430F. These results demonstrate that Ti4C2S2 is a promising dispersoid in free-cutting stainless steels to substitute for Pb and MnS.
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