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Control method for bearing steel network carbides and banded carbides and bearing steel

A technology of network carbide and ribbon carbide, which is applied in the field of bearing steel production and manufacturing, can solve the problems of drop, cracks and wear resistance of bearing steel, and achieve the goal of ensuring uniformity, reducing effect, and inhibiting the precipitation of carbides Effect

Active Publication Date: 2016-06-08
SUZHOU SUXIN SPECIAL STEEL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the technical problem that the existing bearing steel production process causes the bearing steel to be prone to cracks and the wear resistance is reduced, so as to provide a bearing that can reduce the cracks of the bearing steel and improve its wear resistance Control method of steel network carbide and ribbon carbide

Method used

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  • Control method for bearing steel network carbides and banded carbides and bearing steel
  • Control method for bearing steel network carbides and banded carbides and bearing steel
  • Control method for bearing steel network carbides and banded carbides and bearing steel

Examples

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Embodiment 1

[0041] This embodiment provides a control method for bearing steel reticular carbides with a billet diameter of 70mm, including:

[0042] Step A. Control the temperature of each process section in the heating furnace, wherein the temperature of the preheating section is controlled to be 820°C, the temperature of the heating section is controlled to be 1105°C, and the temperature of the soaking section is controlled to be 1180°C;

[0043] Step B. Controlling the rolling start temperature to be 1060°C;

[0044] Step C. Controlling the final rolling temperature at 830°C;

[0045] Step D. Control the water cooling time and the temperature of the steel billet after water cooling, so that the steel billet passes through the temperature range of 700°C-850°C within 5 seconds, and control the temperature of the steel billet after water cooling between 600-650°C.

[0046] The control method of the bearing steel reticular carbide and strip-shaped carbide in this embodiment is to control...

Embodiment 2

[0051] This embodiment provides a control method for bearing steel reticulated carbides and banded carbides with a billet diameter of 80mm, including:

[0052] step a. Control the temperature of each process section in the heating furnace, wherein the temperature of the preheating section is controlled to be 810°C, the temperature of the heating section is controlled to be 1125°C, and the temperature of the soaking section is controlled to be 1200°C;

[0053] Step B. Controlling the rolling start temperature at 1100°C;

[0054] Step C. controlling the final rolling temperature to be 850°C;

[0055] Step D. Control the water cooling time and the temperature of the steel billet after water cooling, so that the steel billet passes through the temperature range of 750°C-850°C within 4 seconds, and control the temperature of the steel billet after water cooling between 600-650°C.

[0056] The control method of the bearing steel reticular carbide and strip-shaped carbide in this e...

Embodiment 3

[0061] This embodiment provides a control method for bearing steel reticulated carbides and banded carbides with a billet diameter of 90 mm, including:

[0062] step a. Control the temperature of each process section in the heating furnace, wherein the temperature of the preheating section is controlled to be 830°C, the temperature of the heating section is controlled to be 1155°C, and the temperature of the soaking section is controlled to be 1220°C;

[0063] Step B. Controlling the rolling start temperature to be 1120°C;

[0064] Step C. controlling the finish rolling temperature to be 870°C;

[0065] Step D. Control the water cooling time and the temperature of the billet after water cooling, so that the billet passes through the temperature range of 750°C-850°C within 3 seconds, and control the temperature of the billet after water cooling between 600-650°C.

[0066] The control method of the bearing steel reticular carbide and strip-shaped carbide in this embodiment is ...

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Abstract

The invention discloses a control method for bearing steel network carbides and banded carbides and bearing steel. The temperature of a finishing pass during hot rolling of the bearing steel is controlled to be within the range of 830 to 870 DEG C, and a large number of carbides are prevented from being separated out; then cooling equipment is utilized for performing water cooling on eventually rolled bar materials, the temperature of the bar materials is made to rapidly pass through the temperature range being 700 to 850 DEG C, the carbides are forcefully inhibited from being separated out, and the proportion of cementite in pearlite is increased; and meanwhile, the temperature of the bar materials after water cooling is controlled to be 600 DEG C to 650 DEG C, and a bainite or martensite structure is prevented from being generated. Production proves that the effect on reducing formation of the bearing steel network carbides and banded carbides is remarkable through the method, the grade of the network carbides in the bearing steel is decreased to the second grade or third grade from above third grade in GB / T18254 and the metallographic phase form of the carbides is a semi-net shape or a mass point shape, and the grade of the banded carbides in the bearing steel reaches the first grade in GB / T18254.

Description

technical field [0001] The invention discloses a method for controlling mesh carbides and strip carbides of bearing steel, belonging to the technical field of bearing steel production and manufacturing. Background technique [0002] Carbide is an important constituent phase of bearing steel. Carbide with fine grains is wear-resistant and can inhibit grain growth, and it can absorb alloy elements to obtain excellent mechanical properties of bearing steel after heat treatment. However, in actual production However, limited by the level of production technology, manufacturers are often unable to suppress the segregation and growth of carbides well, resulting in a large number of coarse network carbides and banded carbides in the bearing steel, so that the bearing parts are in the heat treatment process. Quenching cracks occur in the middle, and the wear resistance is reduced due to the peeling off of the carbide in the skin during use. Therefore, the control of carbides has be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/84C21D6/00C22C38/00
Inventor 赵文贵崔冕周志伟刘栋林徐益峰俞杰
Owner SUZHOU SUXIN SPECIAL STEEL
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