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Long-fatigue-life strip steel as well as preparation method and application thereof

A technology for fatigue life and strip steel, applied in the field of high fatigue life strip steel and its preparation, which can solve the problems of decarburization, reducing the fatigue performance of products, and restricting the use of products.

Inactive Publication Date: 2021-02-05
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are high elements such as C and Mn in the hollow stabilizer bar products, which are prone to decarburization, which significantly reduces the fatigue performance of the product and limits the further use of the product

Method used

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  • Long-fatigue-life strip steel as well as preparation method and application thereof
  • Long-fatigue-life strip steel as well as preparation method and application thereof

Examples

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preparation example Construction

[0043] According to another typical embodiment of the present invention, a method for preparing strip steel with high fatigue life is also provided, the method comprising:

[0044] obtaining a cast slab of said high fatigue life steel strip;

[0045] Heating the cast slab before rolling, hot rolling, cooling after rolling and coiling to obtain hot rolled coils;

[0046] In the heating before piercing, the temperature out of the furnace is 1180-1260°C, and the time in the furnace is ≥180min,

[0047] The hot rolling includes rough rolling and finish rolling, the termination temperature of the rough rolling is 1020-1100°C, and the termination temperature of the finish rolling is 840-880°C,

[0048] In the post-rolling cooling, intensive cooling to 580-640°C is adopted in the front stage.

[0049] In the heating before rolling, the furnace temperature is controlled to be 1180-1260 ° C, and the reason for the furnace time ≥ 180 min is to fully melt the alloying elements. If the...

Embodiment 1

[0055] The high-fatigue-life steel strip provided in this embodiment is composed of the following chemical components in mass fraction:

[0056] C 0.28%, Si 0.15%, Mn 1.3%, P 0.014%, S 0.002%, Al 0.04%, Ti 0.02%, B 0.0030%, Cr 0.25%, N 0.004%, Sb: 0.08%, Sn: 0.1% , and the rest are Fe and unavoidable impurities.

[0057] This embodiment also provides a preparation method for the above-mentioned strip steel with high fatigue life, including:

[0058] obtaining a cast slab of said high fatigue life steel strip;

[0059] Heating the cast slab before rolling, hot rolling, cooling after rolling and coiling to obtain hot rolled coils;

[0060] In the pre-stripping heating, the furnace temperature is 1240°C, the time in the furnace is 220min, the length, width and height of the billet are controlled to be 8.5m, 1m and 230mm respectively, and the temperature difference of the cross section of the billet is controlled to be 12°C;

[0061] Hot rolling includes rough rolling and finis...

Embodiment 2

[0065] The high-fatigue-life steel strip provided in this embodiment is composed of the following chemical components in mass fraction:

[0066] C 0.36%, Si 0.18%, Mn 1.2%, P 0.013%, S 0.002%, Al 0.05%, Ti 0.03%, B0.0025%, Cr 0.2%, N 0.003%, Sb: 0.15%, the rest is Fe and unavoidable impurities.

[0067] This embodiment also provides a preparation method for the above-mentioned strip steel with high fatigue life, including:

[0068] obtaining a cast slab of said high fatigue life steel strip;

[0069] Heating the cast slab before rolling, hot rolling, cooling after rolling and coiling to obtain hot rolled coils;

[0070] In the pre-stripping heating, the furnace temperature is 1220°C, the time in the furnace is 230min, the length, width and height of the billet are controlled to be 9m, 900mm and 230m respectively, and the temperature difference of the cross section of the billet is controlled to be 15°C;

[0071] Hot rolling includes rough rolling and finish rolling. In roug...

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Abstract

The invention relates to long-fatigue-life strip steel as well as a preparation method and application thereof, and belongs to the technical field of steel preparation. The long-fatigue-life strip steel is prepared from the following chemical components in percentage by mass: 0.26 to 0.45 percent of C, 0.10 to 0.25 percent of Si, 1.1 to 1.4 percent of Mn, less than or equal to 0.015 percent of P,less than or equal to 0.003 percent of S, 0.015 to 0.08 percent of Al, 0.01 to 0.05 percent of Ti, 0.0010 to 0.0050 percent of B, 0.10 to 0.30 percent of Cr, less than or equal to 0.006 percent of N,and at least one of the following chemical components in percentage by mass: 0.05 to 0.2 percent of Sb, 0.05 to 0.2 percent of Sn, and the balance of Fe and inevitable impurities. A hollow stabilizerbar is prone to surface decarburization in the plurality of heat treatment in the raw material production and follow-up forming process, so that the surface hardness is reduced, and the fatigue life is shortened. The tin / antimony element is prone to enrich on the surface layer of steel to inhibit the diffusion of C from the strip steel, so that decarburization of the surface layer is inhibited. Atleast one of Sb and Sn is added into the chemical components of the material, so that the fatigue life of the final part hollow stabilizer bar is prolonged by reducing surface decarburization of thematerial.

Description

technical field [0001] The invention belongs to the technical field of steel preparation, and in particular relates to a strip steel with high fatigue life and its preparation method and application. Background technique [0002] With the development of the automobile industry, the automobile industry has higher and higher requirements for automobile lightweight, energy saving and emission reduction. The use of ultra-high-strength strip steel is an inevitable requirement for the development of the automobile industry. The hollow stabilizer bar is a key core component of a passenger car. Its function is to prevent the car from rolling over when the car is turning or the left / right wheels are subjected to different loads, improve the operating stability of the car, and also improve the ride comfort of the car. The car stabilizer bar used to use rods, but it was changed to a hollow stabilizer bar in order to meet the weight reduction requirements of the car. [0003] The hollo...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/28C22C38/32C22C38/60C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0263C22C38/001C22C38/008C22C38/02C22C38/04C22C38/06C22C38/28C22C38/32C22C38/60
Inventor 张衍郭子峰李秋寒郭佳冯军陈斌牛涛武巧玲白凤霞刘阳春李玉鹏吴科敏吴新朗张世龙武原野刘兰霄吕宝锋赵青范然然杨业尼兴周娜徐伟张嘉琪宋春华陈波王伦
Owner SHOUGANG CORPORATION
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