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Medium-carbon steel spheroidization annealing process

An annealing process, spheroidizing annealing technology, applied in the field of medium carbon steel spheroidizing annealing process, can solve the problems that annealing cannot meet the requirements of cold extrusion, high carbon content of medium carbon steel, etc., achieve internal stress release, spherical structure improvement, Effect of Energy Consumption Reduction

Inactive Publication Date: 2013-01-30
镇江中虎弹簧有限公司
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Problems solved by technology

[0002] At present, there is a lot of demand for cold forgings of medium carbon steel in the market, but due to the high carbon content of medium carbon steel, the annealing of the traditional process cannot meet the requirements of cold extrusion

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  • Medium-carbon steel spheroidization annealing process

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with embodiment.

[0011] A spheroidizing annealing process for medium carbon steel, comprising the following steps:

[0012] a) blank pre-increased stress;

[0013] b) Annealing: Use a well-type vacuum annealing furnace to evacuate and fill with nitrogen to protect the annealing. After annealing, the single side of oxidative decarburization is less than or equal to 0.05mm, and the material hardness after annealing is HRB70-75.

[0014] The conditions for the spheroidizing annealing are heating rate<150°C / h, cooling rate<50°C / h; pre-evacuation, filling nitrogen after each pumping, the pressure is ≥0.01Mpa; annealing metallographic structure is F+P Balls, grade 4-6; heat preservation at 720°C for 5 hours; air-cool to 300°C and release from the oven.

[0015] Spheroidizing annealing: 90Kw vacuum spheroidizing annealing furnace is used for annealing, the hardness is HRB70-75, and the spheroidizing rate ...

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Abstract

The invention relates to a medium-carbon steel spheroidization annealing process. According to the invention, medium-carbon steel blank internal stress is pre-increased, such that metal fibrous tissues in the blank are in a compressed state; and with a special annealing treatment, the compressed metal fibrous tissues are released, such that medium-carbon steel cold-forging conditions are reached.

Description

technical field [0001] The invention relates to a heat treatment process, in particular to a medium carbon steel spheroidizing annealing process for cold extrusion of medium carbon steel. Background technique [0002] At present, there is a lot of demand for cold forgings of medium carbon steel in the market, but due to the high carbon content of medium carbon steel, the annealing of the traditional process cannot meet the requirements of cold extrusion. Therefore, each cold forging manufacturer is in urgent need of a new process to solve the annealing problem of medium carbon steel to meet the growing market demand. Contents of the invention [0003] Purpose of the invention: The purpose of the invention is to provide a spheroidizing annealing process for medium carbon steel that cannot be cold forged. [0004] Technical solution: a medium carbon steel spheroidizing annealing process, including the following steps: [0005] a) blank pre-increased stress; [0006] b) An...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/32
Inventor 姚伟强
Owner 镇江中虎弹簧有限公司
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