Carburizing technique for medium carbon steel cold rolled bearing case loop

A bearing ring, cold rolling technology, applied in the field of heat treatment, can solve the problem that the carburizing heat treatment process of medium carbon steel bearing rings has not been reported, and achieve the effects of reducing crack growth rate, high toughness and improving service life

Inactive Publication Date: 2009-12-16
LUOYANG BEARING RES INST CO LTD
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  • Abstract
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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

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Embodiment Construction

[0011] The medium-carbon steel cold-rolled bearing ring of the present invention is made of tube material or bar material forged cake punching and annealed to form a ring, and is cold-rolled into a bearing ring, and then carburized and heat-treated: at 1.15 In the carburizing atmosphere with % carbon potential, it is directly quenched after carburizing at 850-870°C for 10 hours, the tempering temperature is 150-160°C, and the tempering time is 3-4 hours.

[0012] After the bearing ring is made of medium carbon steel and cold rolled, its structure, especially the part of the bearing raceway with relatively large deformation, has changed greatly compared with the ring formed by general high-carbon chromium bearing steel lathing. The biggest feature is that the grains are crushed during the cold rolling deformation process, and there are a large number of dislocations and sub-grain boundaries. After the structure undergoes the carburizing process of the present invention, its str...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F17/00C23C8/22C21D9/40C21D1/18C21D11/00
Inventor 张增歧刘耀中雷建中高元安梅亚莉仇亚年李斌李丹
Owner LUOYANG BEARING RES INST CO LTD
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