Microalloying third-generation car spring flat steel and preparing method thereof

A technology of microalloying and flat steel, which is applied in the field of leaf springs, can solve the problems of poor tempering resistance elasticity, strength level and hardenability that cannot meet the requirements of high-end users, low Si content, etc., and achieve good hardenability and hardenability effect

Active Publication Date: 2017-07-25
东风汽车底盘系统有限公司
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Problems solved by technology

The steel has poor tempering resistance due to its low Si content. At the same time, the

Method used

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Embodiment Construction

[0024] The present invention is a kind of microalloyed third-generation spring flat steel for automobiles, the components of which are: C 0.48-0.60%, Si 0.4-0.8%, Mn 0.60-1.00%, Cr 0.80%-1.20 %, Nb 0.01%~0.05%, B0.0005%~0.003%, P≤0.025%, S≤0.025%, Cu≤0.25%, Ni≤0.35%, Ti≤0.02%, and the rest is Fe.

[0025] It is produced according to the following steps: blast furnace molten iron → molten iron desulfurization → converter smelting → LF refining → RH vacuum treatment → billet protection pouring → billet heating → rolling → cooling bed slow cooling → cut to length.

[0026] (1) Desulfurization of molten iron;

[0027] (2), converter smelting;

[0028] (3), LF refining;

[0029] (4), RH vacuum treatment;

[0030] (5) billet protection pouring;

[0031] (6), billet heating;

[0032] (7), rolling;

[0033] (8), slow cooling on the cooling bed;

[0034] (9), cut to length;

[0035] (10) Heat treatment: oil quenching at 800-910°C, heat preservation for 25-60 minutes, then tempe...

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Abstract

The invention relates to a microalloying third-generation car spring flat steel and a preparing method thereof. The microalloying third-generation car spring flat steel comprises, by weight percentage, 0.48%-0.60% of C, 0.4%-0.8% of Si, 0.60%-1.00% of Mn, 0.80%-1.20% of Cr, 0.01%-0.05% of Nb, 0.0005%-0.003% of B, not larger than 0.025% of P, not larger than 0.025% of S, not larger than 0. 25% of Cu, not larger than 0.35% of Ni, not larger than 0.02% of Ti and the balance Fe. The preparing method includes the steps of blast furnace molten iron production, molten iron desulphurization, converter smelting, LF refining, RH vacuum treatment, square billet protection pouring, square billet heating, rolling, cooling bed slow cooling and fixed-size shearing. According to the microalloying third-generation car spring flat steel and the preparing method, niobium and boron microalloying and the silica content more suitable for the spring steel high elasticity ultra-low decarburization trend are adopted, the proper clean steel smelting process, rolling process and slow cooling control technology are adopted in a combined manner, and the high-end car spring flat steel having uniform texture, good hardenability, reasonably-matched comprehensive mechanicalness and good hardenability is developed.

Description

technical field [0001] The invention relates to a leaf spring, in particular to a microalloyed third-generation spring flat steel for automobiles and a preparation method. Background technique [0002] With the demand for lightweight development of automobiles, the strength of spring flat steel used in automobiles continues to increase, and the development trend of needing a high-strength spring flat steel to replace ordinary spring flat steel below 1500MPa is becoming more and more obvious. In addition, after the strength of the spring flat steel material is improved, its toughness deteriorates, making it prone to fracture, which affects vehicle safety. At the same time, the hardenability becomes poor, which is not conducive to the production and manufacture of leaf springs with variable cross-section thickness specifications, and cannot meet the development needs of heavy-duty commercial vehicles. [0003] As the most important elastic component of the shock absorption sy...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/26C22C38/32C22C38/20C22C38/28C22C38/48C22C38/54C22C38/42C22C38/50C22C33/04C21D1/18
CPCC21D1/18C22C33/04C22C38/02C22C38/04C22C38/20C22C38/26C22C38/28C22C38/32C22C38/42C22C38/48C22C38/50C22C38/54
Inventor 刘祥军丁礼权宋志刚瞿海锦任安超
Owner 东风汽车底盘系统有限公司
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