Ring for spinning machinery

摘要

A ring for spinning machinery is made of alloy steel containing Cr 0.9-26% as basic material. The basic material is cut in the desired ring shape, is subjected to gas carburizing, quenching, subzero treatment and tempering and is finally subjected to a grinding. This ring has a surface layer in which carbide occupies 30-90% in the rate of area, with a surface roughness which has an average roughness of less than Ra 0.25 mu m at a center line.