CHROME-NICKEL STAINLESS STEEL ALLOY ARTICLE HAVING AN OXIDE-SHAPED COATING FROM THE BASE METAL ADAPTED FOR A BRAKE DEVICE

摘要

The present invention relates to a chromium-nickel stainless steel alloy article having an adherent and wear-resistant metal oxide coating, and a method of forming an adherent and resistive metal oxide coating. wear on a chrome-nickel stainless steel alloy article. The coating desirably has a thickness of about 25.4 to about 102 microns (1 mil to about 4 mils), and is formed by exposing the article to an oxidizing atmosphere, preferably air, preferably during the thermal treatment of the article.These articles are useful, inter alia, as torque transmission inserts (25) for a brake disk for brake block or multi-disk clutch. The inserts may be formed of an alloy such as 17-4PH stainless steel alloy having an adherent coating of lubricated oxides formed during frictional contact. It is believed that these lubricated oxides will also form if the thermally treated base alloy is subjected to temperatures above 815.6 degrees C (1500 degrees F) for a sufficient time in an oxidizing atmosphere.