Novel spheroidizing annealing technology for bearing steel wire

A technology of spheroidizing annealing and steel wire, which is applied in furnace types, manufacturing tools, furnaces, etc., can solve the problems of long process cycle and annealing capacity compression, and achieve the effect of increasing annealing capacity and shortening annealing cycle.

Pending Publication Date: 2019-03-01
JIANGYIN XINGCHENG GOLD MATERIALS CO LTD
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Problems solved by technology

[0004] In the traditional spheroidizing annealing process, the heating and cooling process of th...

Method used

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  • Novel spheroidizing annealing technology for bearing steel wire
  • Novel spheroidizing annealing technology for bearing steel wire
  • Novel spheroidizing annealing technology for bearing steel wire

Examples

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Embodiment 1

[0024] A new type of bearing steel wire spheroidizing annealing process, using a bell furnace for spheroidizing treatment, including the following steps:

[0025] A. Put the bearing steel wire in the bell-type furnace, fill the heat treatment furnace with nitrogen with a purity of 99.999% purified by a nitrogen purification device, and after 20 minutes, close the process nitrogen, and fill the heat treatment furnace with a purity of 99.999% % of industrial hydrogen, first heated to 800°C and kept for 40 minutes, and at the same time shut down the process hydrogen, then heated to the holding section, soaked at 780°C, and held for 7 hours;

[0026] B. Cooling in the first stage: Cool the temperature in the furnace to 700-720°C at a rate of 50°C / h, and keep it warm for 1h;

[0027] C. Second-stage cooling: continue to cool the furnace temperature to 650°C at a rate of 12.5°C / h;

[0028] D. The third stage of cooling: continue to cool the temperature in the furnace to 300°C at a ...

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Abstract

The invention relates to a novel spheroidizing annealing technology for a bearing steel wire. The novel spheroidizing annealing technology comprises the steps that the bearing steel wire is arranged in a cover-type furnace, a heat treatment furnace is filled with nitrogen, then nitrogen filling is stopped, the heat treatment furnace is filled with hydrogen, the heat treatment furnace is heated tothe high temperature T0 firstly, T0 is 780 to 800 DEG C, heat preservation is conducted for 0.5-5 h, meanwhile, technology nitrogen filling is stopped, then the temperature is controlled at the heat preservation stage, uniform heating is controlled at 780+/-2 DEG C, and heat preservation treatment is conducted for 5-7 h; first-stage cooling is conducted, specifically, the interior of the furnace is cooled to 700- 720 DEG C at the speed of 50+/-4 DEG C/h, and heat preservation is conducted for 1 h; second-stage cooling is conducted, specifically, the interior of the furnace continues being cooled to 650 DEG C at the speed of 12.5+/-2 DEG C/h, and heat preservation is not conducted; third-stage cooling is conducted, specifically, the interior of the furnace continues being cooled to 300 DEGC at the speed of 230+/-10 DEG C/h, meanwhile, water spraying for cooling is started, and heat preservation is not conducted; and fourth-stage cooling is conducted, specifically, the interior of the furnace continues being cooled to 150 DEG C at the speed of 70+/-10 DEG C/h, and a product is taken from the furnace. According to the novel spheroidizing annealing technology, the annealing period ofthe bearing steel wire is shortened, and the annealing capacity is increased.

Description

technical field [0001] The invention relates to an annealing process of metal materials, in particular to a spheroidizing annealing process of a novel bearing steel wire. Background technique [0002] Spheroidizing annealing is one of the basic ways to improve the structure and properties of steel. The main purpose of spheroidizing annealing is to spheroidize carbides in the microstructure of steel materials, reduce the hardness of materials, improve the plasticity of materials, and reduce the deformation resistance of materials. , making the material easy to be plastically formed. Bearing steel wire is mainly used to manufacture rolling elements or ferrules of rolling bearings. The key is to select a suitable spheroidizing annealing process. [0003] Spheroidizing annealing is the process of heating the steel to 20-30°C above AC1, keeping it warm for an appropriate time, and then cooling slowly with the furnace to finally obtain spherical pearlite. [0004] In the traditi...

Claims

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Application Information

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IPC IPC(8): C21D1/32C21D1/74C21D9/52C21D6/00C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44
CPCC21D1/32C21D1/74C21D6/004C21D6/005C21D6/008C21D9/525C21D2211/009C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44
Inventor 时洋连俊巍
Owner JIANGYIN XINGCHENG GOLD MATERIALS CO LTD
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