Controlled Cooling and Controlled Rolling Method for Carbide Network Control of Bearing Steel Wire Rod

一种控冷控轧、碳化物的技术，应用在钢铁制造领域，能够解决高温差、增加炼钢成本、增加炼钢难度等问题，达到温度均匀、冷却速度快、冷却时间短的效果

Active Publication Date: 2020-02-07
JIANGYIN XINGCHENG GOLD MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its invention increases the cost of steelmaking and the difficulty of steelmaking through compositional adjustment, but without the guarantee of subsequent cooling control process, it is impossible to realize the control of carbide network precipitation
[0006] The method disclosed in the application number 200910062664.X for reducing the carbide network level of bearing steel wire rod mainly involves cooling the wire rod through air cooling after spinning, and the air cooling speed is controlled at 2°C / s-10°C / s. The method can control the cooling of the wire rod, but there will be a high temperature difference between the middle of the wire rod and the overlapping point after air cooling, resulting in the inhomogeneity of the overall carbide network quality of the wire rod

Method used

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  • Controlled Cooling and Controlled Rolling Method for Carbide Network Control of Bearing Steel Wire Rod
  • Controlled Cooling and Controlled Rolling Method for Carbide Network Control of Bearing Steel Wire Rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The production specification is Φ18mm high-carbon chromium bearing steel wire rod. The wire rod is rolled into the specified specification by high-speed wire rod and then spun into loose coils. The carbide network control is carried out according to the following process parameters: the temperature of the entering and reducing sizing machine (ie, the final rolling temperature) is 830°C-870°C, and the spinning temperature of the wire rod is 810°C-850°C; the wire rod passes through the water bath online after spinning Controlled cooling by isothermal quenching, the temperature of the water bath is 90°C-97°C, and the cooling time of the water bath is 20s-80s; the temperature of the outlet water after the wire rod is cooled by the EDC water bath is 620°C-630°C. After the wire rod comes out of the water, add a cover to cool slowly. The holding time is 30min-60min, and slowly cool to 430°C-470°C. After taking out the cover, the collection rolls were air-cooled to room tempera...

Embodiment 2

[0036] The production specification is Φ13.5mm high-carbon chromium bearing steel wire rod, and the wire rod is rolled into the specified specification by high-speed wire rod before spinning. The carbide network control is carried out according to the following process parameters: the temperature of the entering and reducing sizing machine is 800°C-850°C, and the spinning temperature of the wire rod is 800°C-840°C; The temperature is 90°C-97°C, and the cooling time in the water bath is 20s-60s; the temperature of the outlet water after the wire rod is cooled by the EDC water bath is 620°C-630°C. After the wire rod comes out of the water, add a cover to cool slowly. The holding time is 40min-60min, and slowly cool to 420°C-450°C. After taking out the cover, the collection rolls were air-cooled to room temperature.

[0037] The chemical composition of the product: C 0.98%, Si 0.29%, Mn 0.31%, Cr 1.45%, Mo 0.01%, Ni0.02%, Al 0.025%, P 0.012%, S 0.001%, Cu 0.09%, Ca 0.0001%, O 0...

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Abstract

The invention relates to a controlled cooling and controlled rolling method for bearing steel wire carbide network control. ℃~880℃; control the spinning temperature from 750℃ to 850℃; use EDC water bath isothermal quenching and cooling to control the continuous coil cooling online, control the cooling speed 2.0℃ / s~10℃ / s, and control the final cooling temperature 620-630 ℃; after isothermal quenching in EDC water bath, add hood and slow cooling, and control the temperature of hood to be 400 ℃ ~ 500 ℃; after slow cooling, collect coils, and air-cool to room temperature. Using EDC water bath isothermal quenching cooling + hood slow cooling to control the cooling of the coil after controlled rolling, which can effectively inhibit the precipitation of carbides during the cooling process, obtain a non-equilibrium microstructure, and form a small strip or hemispherical shape Carbides, the final carbide network is controlled.

Description

technical field [0001] The invention belongs to the technical field of iron and steel manufacturing, and in particular relates to a controlled cooling and rolling method for controlling the carbide network of bearing steel wire rods. Background technique [0002] The carbide network is formed by precipitation at the austenite grain boundary during the slow cooling process after high final rolling temperature. Once the carbide network is formed, especially the carbide completely surrounds the grain boundary, and is wide and When it is thick, microcracks will be generated along the grain boundaries during subsequent processing and use, which will greatly reduce the service life of the rolling elements. [0003] First of all, the serious carbide network cannot be completely eliminated in the subsequent spheroidizing annealing, so that it is easy to produce wear cracks, also called cracks, during the grinding process of bearing processing; secondly, if the original carbide netwo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/06C21D1/20C21D1/60
CPCC21D1/20C21D1/60C21D8/065C22C38/02C22C38/04C22C38/18C21D9/38C21D9/40C21D1/78C21D11/005C21D2211/004F16C19/00F16C2204/66F16C2204/72F16C2204/70F16C2220/44F16C2223/10F16C2240/06F16C2240/08F16C2240/60F16C2240/26F16C33/64F16C33/588C21D9/52C21D6/004C21D6/005C21D6/008C21D9/525C22C38/002C22C38/008C22C38/06C22C38/42C22C38/44C22C38/50
Inventor 张林张剑锋陆长河官跃辉李国忠许晓红白云宗浩何佳锋陈德黄镇杨佳
Owner JIANGYIN XINGCHENG GOLD MATERIALS CO LTD
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