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Hot-rolled steel material for automobile friction plate and preparation method thereof

A friction plate and steel technology, which is applied in the field of hot-rolled strip steel manufacturing, can solve the problems of large drop in hardness, unevenness, and easy cracking of products, and achieve the effect of improving the yield, service performance, and good cold forming performance.

Active Publication Date: 2017-10-13
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since there are no stable and high-temperature-resistant carbides in the steel, after the material is annealed at high temperature, the hardness of the product will drop greatly and unevenly, which does not meet the existing process requirements
If the hardness of the existing hot-rolled steel sheet before annealing is further increased to more than 30HRC, it is easy to crack during the stamping process
In addition, the roughness Ra of the hot-rolled strip steel is above 1.0um, which does not meet the requirement of the existing technology that the surface roughness of the steel base is less than 0.30um

Method used

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  • Hot-rolled steel material for automobile friction plate and preparation method thereof
  • Hot-rolled steel material for automobile friction plate and preparation method thereof
  • Hot-rolled steel material for automobile friction plate and preparation method thereof

Examples

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Embodiment Construction

[0039] The implementation of the present invention will be described in detail below in conjunction with the examples, but they do not constitute a limitation of the present invention, and are only examples. At the same time, the advantages of the present invention will become clearer and easier to understand.

[0040] Table 1 shows the chemical composition and weight percentage of the hot-rolled steel for automobile friction plates in Examples 1-6, the chemical composition and weight percentage of the comparison steel for Comparative Examples 1-3, and the rest are Fe and unavoidable impurities.

[0041] Table 1 Chemical composition and percentage by weight (wt %) of each embodiment of the present invention and comparative example

[0042]

[0043]The hot-rolled steel material of the automobile friction plate is obtained by heating, controlled rolling, controlled cooling, coiling, slow cooling, pickling and smoothing the slab obtained after the chemical composition is smelt...

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Abstract

The invention discloses a hot-rolled steel material for an automobile friction plate. The chemical composition and mass percentage in the steel are: C: 0.45-0.75%, Si: 0.10-0.30%, Mn: 0.60-1.20%, P≤0.015%, S ≤0.005%, N≤0.006%, Cr: 0.05-0.50%, Als: 0.015-0.050%, Ti≤0.005%, V: 0.01-0.03%, and the rest are Fe and unavoidable impurities. The invention also discloses a preparation method of the hot-rolled steel material of the automobile friction sheet. The hardness of the hot-rolled steel in the invention is controlled at 18-25HRC, and after annealing at 600-850°C, the hardness of the steel is still maintained at 14-18HRC, has good cold forming performance, and the steel does not crack during the punching process.

Description

technical field [0001] The invention relates to a hot-rolled strip steel manufacturing technology, in particular to a hot-rolled steel material for an automobile friction plate and a preparation method thereof. Background technique [0002] Automobile friction plate is an important part of the automobile braking system and one of the vulnerable parts of the automobile. The current processing procedure includes blanking steel sheet, flattening, grinding, and then sintering a layer of copper-containing friction material on the ground steel base. The working environment and processing technology of automobile friction discs require that the steel base has good hardenability, wear resistance, and high strength, etc., and especially requires that the steel base still have a hardness of 14-18HRC after sintering at 600-800°C. In addition, automobile friction discs also have high requirements on the thickness accuracy and surface of the steel belt, with the thickness accuracy requi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28C22C38/24C21D8/02
Inventor 谭文韩斌蔡珍汪水泽甘小龙孙宜强
Owner 武汉钢铁有限公司
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