Carburizing technique for medium carbon steel cold rolled bearing case loop

Abstract

The invention discloses a carburizing process for a medium-carbon steel cold rolling bearing ring, which belongs to the technical field of heat treatment. The ring is made of tube material or bar material forged cake punching and annealed, and then cold rolled into a bearing ring, and then carburized heat treatment process: in a carburizing atmosphere of 1.15% carbon potential, at 850~ After carburizing at 870°C for 10 hours, it is directly quenched, the tempering temperature is 150-160°C, and the tempering time is 3-4 hours. The medium-carbon steel bearing rings treated with this carburizing process have higher toughness and longer fatigue life, especially for bearings working in polluted environments, which can improve service life and operational reliability.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and in particular relates to a carburizing process for cold rolling bearing rings of medium carbon steel. Background technique [0002] Most of the commonly used materials for bearing rings are high-carbon chromium bearing steel, which has a high carbon content. Even after annealing, the cold deformation resistance is still high, which affects the cold rolling performance and the service life of the mold. The rolling ring is prone to cracks and becomes a waste product. Famous foreign bearing companies such as NSK, etc., developed medium-carbon alloy steel bearing rings in the 1990s, and adopted a special heat treatment process, which can greatly improve the bearing life, especially under the condition of polluted lubrication. . [0003] Medium carbon steel has good cold rolling performance. Through cold rolling, it can save material and improve structure. The special heat treatment proce...

AI Technical Summary

Problems solved by technology

[0003] Medium carbon steel has good cold rolling performance. Through cold rolling, it can save material and improve structure. The special heat treatment process can greatly improve the bearing life, especially the bearing life under the condition of polluted lubrication, but for medium carbon steel The carburizing heat treatment process of the bearing ring has not been reported yet