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Heat treatment process for bearing steel

A bearing steel and process technology, applied in the field of heat treatment of bearing steel, can solve the problems of complex quenching process, low product market competitiveness, low production efficiency, etc., achieving simple process, eliminating repetitive processes and improving work efficiency. Effect

Inactive Publication Date: 2016-10-05
重庆展申机械厂
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Problems solved by technology

[0002] At present, the quenching process used for bearing steel is relatively complicated, and there is no unified specification and standard, resulting in uneven quality of the produced steel parts, and many repeated processes also make the production efficiency low, increase the labor burden of workers, and make the products The market competitiveness is not high
For some operators who have just entered the industry, there is no clear method and process, resulting in frequent mistakes and omissions during operation, and may even cause serious consequences

Method used

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Embodiment Construction

[0009] The technical solution disclosed by the invention is a heat treatment process for bearing steel, which includes the following steps: 1) Normalizing: chromium bearing steel normalizing process, the workpiece is kept warm for 40-60 minutes after diathermy, cooling needs to be faster, and immediately after normalizing, turn to For spheroidizing annealing;

[0010] 2) Spheroidizing annealing: It needs to be heated to 900~920℃ before annealing, and then normalized after holding for 2 / 3~1h. Depends on tissue homogeneity;

[0011] 3) Quenching: The quenching temperature of Cr15 steel is 820~860℃, and the critical diameter of oil quenching is 25mm. Generally, oil cooling is used for quenching, and the heating and holding time is longer than that of alloy tool steel. Furnace heating coefficient 1.5~2min / mm;

[0012] 4) Tempering: Tempering at a low temperature of 460°C±10°C is used, and the tempering time is generally 2~4h.

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Abstract

The invention discloses a heat treatment process for bearing steel. The heat treatment process is characterized by comprising the following steps: 1) normalizing: as for a chromium bearing steel normalizing process, after a workpiece is thoroughly heated, the workpiece is maintained at the temperature for 40 to 60 min, cooling is rapidly carried out, and spheroidizing annealing is immediately carried out after normalizing; 2) spheroidizing annealing: the workpiece is heated to 900 to 920 DEG C before annealing, the temperature of the workpiece is maintained for 2 / 3 to 1 h before normalizing, and heat preservation time depends on the size of the workpiece, uniformity of a heating furnace, a charging method, a charging amount and uniformity of an original structure before annealing; 3) quenching: quenching temperature of Cr15 steel is in a range of 820 to 860 DEG C, a critical oil quenching diameter is 25 mm, an oil quenching manner is used, the heating and heat preservation time of Cr15 steel is longer than the heating and heat preservation time of alloy tool steel, the heating coefficient of a salt bath is 0.8 to 1.5 min / mm, and the heating coefficient of an air furnace is 1.5 to 2 min / mm; and 4) tempering: tempering is carried out at a low temperature of 460 + / - 10 DEG C for 2 to 4 h. The process provided by the invention is simple, omits a great number of repeated procedures and has improved work efficiency.

Description

technical field [0001] The invention relates to a heat treatment process of bearing steel. Background technique [0002] At present, the quenching process used for bearing steel is relatively complicated, and there is no unified specification and standard, resulting in uneven quality of the produced steel parts, and many repeated processes also make the production efficiency low, increase the labor burden of workers, and make the products market competitiveness is not high. For some operators who have just entered the industry, there is no clear method and process, resulting in frequent mistakes and omissions during operation, and may even cause serious consequences. Contents of the invention [0003] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a heat treatment process for bearing steel, which is simple, eliminates many repetitive procedures, and improves work efficiency. [0004] In o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D1/18C21D1/32
Inventor 赵伟
Owner 重庆展申机械厂
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