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A kind of free-cutting steel for automobile synchronizer and preparation method thereof

A free-cutting steel and synchronizer technology, applied in the field of free-cutting steel, can solve the problems of high surface quality, unfavorable to satisfy high sulfur content, high carburization and machinability at the same time, etc.

Active Publication Date: 2021-05-11
宝钢特钢长材有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In summary, the existing free machinability steels and their production methods are not conducive to simultaneously satisfying the requirements of high sulfur content, high surface quality, high carburization and machinability

Method used

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  • A kind of free-cutting steel for automobile synchronizer and preparation method thereof
  • A kind of free-cutting steel for automobile synchronizer and preparation method thereof
  • A kind of free-cutting steel for automobile synchronizer and preparation method thereof

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Embodiment Construction

[0031] The steel for free-cutting automobile synchronizer of the present invention, by weight percentage, comprises:

[0032] C: 0.06% to 0.12%, Mn: 1.00% to 1.30%, Si: ≤0.08%, Cr: 0.10% to 0.40%, P: 0.050% to 0.100%, S: 0.32% to 0.40%, N: 0.006% ~0.015%, Al: 0~0.040%, [O]≤0.0020%, the balance is iron and unavoidable impurity elements.

[0033] According to the specific performance requirements of the product, the internal control range of each element is: C: target value ±0.01%, Mn alloy element: target value ±0.04%, the residual harmful elements are as low as possible, and the Mn / S ratio is controlled to be ≥3.

[0034] in:

[0035] C: It can increase the content of pearlite in the structure in steel, and it is the main element to improve the strength of steel. However, if the C content is too high, the cutting resistance will increase and the machinability will be deteriorated. Controlling the C content at 0.06% to 0.12% can ensure that the steel of the invention can not...

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Abstract

The invention discloses a free-cutting steel for automobile synchronizer, which comprises: C: 0.06% to 0.12%, Mn: 1.00% to 1.30%, Si: ≤0.08%, Cr: 0.10% to 0.40% by weight %, P: 0.050% ~ 0.100%, S: 0.32% ~ 0.40%, N: 0.006% ~ 0.015%, Al: 0 ~ 0.040%, [O] ≤ 0.0020%, the balance is iron and unavoidable impurity elements , and Mn / S≥3. The invention also discloses a preparation method of the steel for the free-cutting automobile synchronizer. Through the optimized design of the composition, the manufactured synchronizer has small deformation after heat treatment, good fatigue performance and stable mechanical properties. In addition, each process is strictly controlled according to the target composition to ensure the precise composition of the steel.

Description

technical field [0001] The invention relates to free-cutting steel, and more specifically refers to a free-cutting steel for automobile synchronizer and a preparation method thereof. Background technique [0002] With the development of the automobile industry and the precision instrument industry, a large number of these industries need to use machining equipment to process parts. With the development of high-speed, precision and automation of machining equipment, there is an increasing demand for steel to improve the machining performance , The above factors have accelerated the increase in the output and variety of free-cutting steel, and the requirements for quality have continued to increase. [0003] Sulfur free-cutting steel accounts for 70% and 90% of the total output of free-cutting steel in the world and China respectively. Sulfur free-cutting steel can be divided into low-sulfur steel, medium-sulfur steel and high-sulfur steel according to the sulfur content. Gen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/18C22C38/60C21C7/06C21C7/10C21D8/00
Inventor 丁忠孟祥军夏玲张成名
Owner 宝钢特钢长材有限公司
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