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Method for improving low-temperature impact toughness of 380MPa-grade hot-rolled wheel steel

A technology of low temperature impact toughness and impact toughness, applied in the field of metallurgy

Pending Publication Date: 2021-04-16
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Abstract
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Problems solved by technology

[0004] The invention provides a method for improving the low-temperature impact toughness of 380MPa grade hot-rolled wheel steel to solve or partially solve how to improve the deformation amount of the core material of 380MPa grade hot-rolled wheel steel and optimize the uniformity of deformation in the thickness direction of the intermediate billet, thereby achieving improvement Effect of Low Temperature Impact Toughness Stability

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  • Method for improving low-temperature impact toughness of 380MPa-grade hot-rolled wheel steel
  • Method for improving low-temperature impact toughness of 380MPa-grade hot-rolled wheel steel

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Embodiment Construction

[0030] In order to enable those skilled in the technical field to which the application belongs to understand the application more clearly, the technical solutions of the application will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0031] In the rolling process of hot-rolled wheel steel, due to the limitation of rolling deformation characteristics and deformation amount, the closer the material is to the center of the intermediate billet in the thickness direction, the smaller the deformation amount is, and the smaller the deformation amount is, the greater the grain fragmentation degree of the material is. The lower the grain size, the larger the grain size, which causes the grain size of the material in the thickness direction of the hot-rolled wheel steel to be produced to be inconsistent, that is, the grain size of the core material in the thickness direction of the wheel steel is too large. The larger the grain...

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Abstract

The invention discloses a method for improving low-temperature impact toughness of 380MPa-grade hot-rolled wheel steel. The method comprises the following steps that an intermediate billet which is used for manufacturing the 380MPa-grade hot-rolled wheel steel is roughly rolled; after the final pass of rough rolling of the intermediate billet is completed, the intermediate billet is cooled, so that the temperature difference between the surface and the core of the intermediate billet is increased; and the intermediate billet is subjected to finish rolling.

Description

technical field [0001] The present application relates to the field of metallurgy, in particular to a method for improving the low-temperature impact toughness of 380MPa grade hot-rolled wheel steel. Background technique [0002] At present, 380MPa grade hot-rolled wheel steel is mainly used to make spokes and rims of commercial vehicles, passenger cars and other vehicles. Its low-temperature impact toughness directly determines the quality of the final wheel product, which is related to the safety and service life of the vehicle. Among them, the degree of grain breakage of hot-rolled wheel steel materials has a great influence on impact toughness. During the rolling process of hot-rolled wheel steel, when the thickness of the intermediate billet is large, it is limited by the characteristics of rolling deformation and the amount of deformation. The lower the degree of grain fragmentation, the larger the grain size. This results in inconsistent material grain sizes in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02
Inventor 王文广李建伟程洋刘靖群张伟缪成亮李晓林肖宝亮
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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