Controlled cooling and controlled rolling method for control over bearing steel wire network carbide

A technology of controlled cooling and controlled rolling and carbide, applied in the field of steel manufacturing, can solve the problems of high temperature difference, increase the cost of steelmaking, increase the difficulty of steelmaking, etc., and achieve the effects of uniform temperature, fast cooling speed and short cooling time.

Active Publication Date: 2019-03-01
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 control over bearing steel wire network carbide
  • Controlled cooling and controlled rolling method for control over bearing steel wire network carbide

Examples

Experimental program
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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 control over bearing steel wire network carbide. The controlled cooling and controlled rolling method is characterized by comprising the steps that a bar is quickly rolled into a wire with the specified specification to be subjected to spinning, scattered rolls are made, the final rolling temperature is controlled to be 780- 880 DEG C; the spitting temperature is controlled to be 750-850 DEG C; the continuous scattered rolls are subjected to on-line controlled cooling through EDC water bath isothermal quenching cooling, the cooling speed is controlled to be 2.0- 10 DEG C / s, and the final cooling temperature is controlled to be 620-630 DEG C; cover-adding slow cooling is conducted after EDC water bath isothermalquenching cooling, and the temperature when the scattered rolls are taken out from a cover is controlled to be 400-500 DEG C; and the rolls are collected after slow cooling, and air cooling is conducted to the room temperature. The disc rolls are subjected to controlled cooling through a mode of EDC water bath isothermal quenching cooling and cover-adding slow cooling, precipitation of the carbide in the cooling process can be effectively inhibited, a non-equilibrium microstructure is obtained, the small-strip-shaped or hemispheric carbide is formed, and finally, the network carbide 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 Applications(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
Owner JIANGYIN XINGCHENG GOLD MATERIALS CO LTD
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