Precipitation Hardening Heat Treatment Process for Angular Contact Ball Bearings

Heat treatment process of precipitation hardening stainless steel for angular contact ball bearings
1. The basic heat treatment procedure of martensitic and martensitic precipitation hardening stainless steel is: solution annealing in the austenite zone at 1010~1066℃, rapid cooling to room temperature for 15 minutes to produce martensitic structure; aging hardening at 480~620℃, 510~565℃ for 30 minutes, over-aging treatment at 630~676℃ for 2~64 hours and then cooling to room temperature.
2. The basic heat treatment procedure of semi-austenitic and semi-austenitic precipitation hardening stainless steel is: solution annealing in the austenite zone; rapid cooling to room temperature to produce metastable austenite; cooling to about -73℃ to transform metastable austenite into martensite, or tempering at about 760℃ to reduce the carbon content of austenite by precipitation of carbides, and then cooling to room temperature to transform austenite into martensite; aging hardening at 450~570℃
3. The basic heat treatment procedures for austenitic and austenitic precipitation hardening stainless steels are: solution annealing in the austenitic zone; b) rapid cooling to room temperature to produce stable austenite; aging hardening at 700~800C. The actual hardening mentioned in the article is a treatment that needs to be performed after the adjustment treatment. It is a way to strengthen the bearing material. When the actual hardening temperature is higher than 400℃, intermetallic compounds will precipitate from the martensite, showing a highly dispersed distribution, which plays a role in precipitation hardening. Aging at 500℃ can obtain bearing materials with high strength and hardness.