Bearing component

Abstract

Bearing component ( 10 ) containing steel that comprises, by weight, 10-30 ppm Ca, max 20 ppm S and max 15 ppm O and in that said steel includes sulphide inclusions and less than 5% of the sulphide inclusions contain encapsulated or embedded oxide inclusions.

1 . A bearing component that comprises steel, and wherein the steel comprises, by weight,
 10-30 ppm Ca,   a maximum of 20 ppm S, and   a maximum of 15 ppm O, and wherein   the steel includes sulphide inclusions, and wherein   less than 5% of the sulphide inclusions contain one of an encapsulated and embedded oxide inclusions.   
     
     
         2 . The bearing component according to  claim 1 , wherein the steel includes sulphide inclusions and the maximum length of said sulphide inclusions is 125 μm at a Reduced Variate equal to 3. 
     
     
         3 . The bearing component according to  claim 1 , wherein the steel comprises:
 10-30 ppm Ca,   maximum 20 ppm S, and   a maximum 10 ppm O.   
     
     
         4 . The bearing component according to  claim 1 , wherein the steel includes sulphide inclusions and all of said sulphide inclusions have an aspect ratio less than 3:1. 
     
     
         5 . The bearing component according to  claims 1 , wherein the steel contains between 0.07 to 1.20% C. 
     
     
         6 . The Bearing component according to any of the preceding claims, characterized in that it constitutes at least part of one of the following: A ball bearing, roller bearing, ball thrust bearing, roller thrust bearing, tapered roller thrust bearing, ball screw, or a component for an application in which is subjected to alternating Hertzian stresses, such as rolling contact or combined rolling and sliding. 
     
     
         7 . The bearing component according to  claim 1 , wherein the steel comprises:
 10-30 ppm Ca,   a maximum 20 ppm S, and   a maximum of 8 ppm O.