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Heat treatment process of preparing bearing roller by using G20CrNi2MoA steel instead of G20Cr2Ni4A steel

A technology of bearing rollers and rollers, which is applied in the field of bearing manufacturing, can solve the problems of long processing period and high price of heat treatment process, achieve great economic benefits, popularize and apply value, facilitate management, and improve process performance

Inactive Publication Date: 2010-03-03
LUOYANG LYC BEARING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

G20Cr2Ni4A steel contains relatively high precious alloy elements Cr and Ni, and its price is also high. It is imminent to save resources in the increasingly scarce resources, and the heat treatment process of using G20Cr2Ni4A steel to manufacture bearing rollers has a long processing cycle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 77188 bearing roller

[0023] a. The rollers are installed on the carburizing rack;

[0024] b. Put the carburizing material rack loaded with rollers into the carburizing furnace, set the carburizing temperature to 930°C, turn on the carbon controller when the temperature indicated by the instrument reaches 800°C, set the carbon potential to 1.0%, and supply carburizing Carbon agent, take the process sample for 24 hours for testing, and adjust according to the test results. After 48 hours, the carbon control instrument is set to 0.80% for diffusion. After that, it is determined whether to adjust the carbon control instrument according to the test results every day. When the test results reach When the process requires, the temperature is lowered to 890°C, and after 2 hours of heat preservation, it is cooled with oil, and then cleaned;

[0025] c. High temperature tempering temperature 600℃, time 10h;

[0026] d. The rollers are placed on the quenching rack;

[0027] ...

Embodiment 2

[0030] 10777 / 600 bearing roller

[0031] a. The rollers are installed on the carburizing rack,

[0032] b. Put the carburizing material rack loaded with rollers into the carburizing furnace, set the carburizing temperature to 930°C, turn on the carbon controller when the temperature indicated by the instrument reaches 800°C, set the carbon potential to 1.0%, and supply carburizing Carbon agent, take the process sample for 24 hours for testing, and adjust according to the test results. After 48 hours, the carbon control instrument is set to 0.80% for diffusion. After that, it is determined whether to adjust the carbon control instrument according to the test results every day. When the test results reach When the process requires, the temperature is lowered to 890°C, and after 2 hours of heat preservation, it is cooled with oil, and then cleaned;

[0033] c. High temperature tempering temperature 600℃, time 10h;

[0034] d. The rollers are placed on the quenching rack;

[00...

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Abstract

The invention relates to a heat treatment process of preparing bearing rollers by using G20CrNi2MoA steel instead of G20Cr2Ni4A steel, belonging to the technical field of bearing production. The method comprises the following steps: using 10-110mm of G20CrNi2MoA steel to prepare carburizing steel rollers, separately adopting quenching mediums--quenching oil, polyving alcohol water solution and alkaline solution to cool the steel rollers according to different diameter of steel rollers and performing high temperature tempering at 600 DEG C for 5h after carburization. The big size carburizing bearing rollers prepared by replacing G20Cr2Ni4A steel and G15CrNi4MoA steel with G20CrNi2MoA steel can not only meet the demands of the operational performance, but also increase the technological properties, shorten the processing cycle, lower the processing cost, save a large number of noble alloying elements--Cr and Ni, reduce the material cost and have higher economic benefit and popularizationand application value.

Description

technical field [0001] The invention belongs to the technical field of bearing manufacture, and mainly relates to a heat treatment process for manufacturing bearing rollers with G20CrNi2MoA steel instead of G20Cr2Ni4A steel. Background technique [0002] For a long time, most of the bearing rollers of large and extra-large rolling mills in my country are made of G20Cr2Ni4A steel. Some countries in the world choose similar steel types such as G15CrNi4MoA to manufacture larger bearing rollers. This is mainly due to the quenching of G20Cr2Ni4A steel. The permeability is good, and the upper and lower limits of the critical diameter are 90-550mm. When quenching in carburizing heat treatment in the bearing industry, quenching oil is generally used for cooling, and the cooling capacity of quenching oil is low. G20Cr2Ni4A and G15CrNi4MoA steel bearing rollers can be hardened. G20Cr2Ni4A steel contains relatively high precious alloy elements Cr and Ni, and its price is also high. It i...

Claims

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Application Information

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IPC IPC(8): C23F17/00C21D1/18C21D9/40C23C8/00
Inventor 沈伟毅于芸李昭昆龚建勋张中文严枫
Owner LUOYANG LYC BEARING
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