Abstract
Oil with an effective chlorinated extremely pressure additive (EP-additive) has widely used for severe metal forming like ironing of stainless steel, because this chloride-oil is superior to the chloride-free oil in an anti-galling property. Environmental and safety issues, however, demands to replace this chloride-oil by chloride-free oil. Particularly, higher performance chloride-free oil is strongly required for ironing of stainless steel. In this paper, the anti-galling performance of oil with organic-sulfur has estimated by an inner-cup ironing test to develop high performance chloride free oil. Furthermore, a series of tests with 10,000-shots ironing in manufacturing showed that the developed oil is as excellent as the conventional chloride oil.
