Heat Treatment Process of Precipitation Hardening Stainless Steel

Heat treatment process of precipitation hardening stainless steel for angular contact ball bearing 

1. The basic heat treatment procedure of martensite and martensite precipitation hardening stainless steel is: keep the temperature of 1010~1066 ℃ by solution annealing in the austenite area, and rapidly cool to room temperature for 15 minutes to produce martensite structure; Age hardening at 480~620 ℃, holding at 510~565 ℃ for 30 minutes, and over aging treatment at 630~676 ℃ for 2~64 hours before dropping to room temperature. 

2. The basic heat treatment procedures of semi austenitic and semi austenitic precipitation hardening stainless steels are: solution annealing in the austenitic region; Fast cooling to room temperature to produce metastable austenite; Cool to about - 73 ℃ to transform metastable austenite into martensite, or temper at about 760 ℃ to reduce the carbon content of austenite through carbide precipitation, and then cool to room temperature to transform austenite into martensite; Age hardening at 450~570 ℃.