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Control method of decarburization of continuously cast bloom for spring steel wire rods

A control method and continuous casting slab technology, which is applied in the direction of heat treatment process control, manufacturing tools, heat treatment equipment, etc., can solve the problems of spring failure, time-consuming and labor-intensive efficiency, fracture, etc., and achieve the effect of improving the service life

Inactive Publication Date: 2011-10-12
武汉钢铁有限公司
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Problems solved by technology

In addition, due to the stress generated by the different expansion coefficients when different parts of the surface layer are quenched, micro-cracks are generated in the transition zone between the fully decarburized layer and the partially decarburized layer, and are used as the origin of the cracks to continue to develop, eventually causing the spring to fail. Or broken, resulting in the need to replace in time, resulting in time-consuming and labor-intensive inefficiency

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  • Control method of decarburization of continuously cast bloom for spring steel wire rods
  • Control method of decarburization of continuously cast bloom for spring steel wire rods

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Embodiment Construction

[0020] A further detailed description is given below:

[0021] The embodiment is carried out according to the following process steps, and is used in the production of spring steel wire rods 60Si2MnA, W55SiCr for automobiles and spring steel wire rods for continuous casting. The main process parameters are shown in Table 1, and the experimental results are shown in Table 2.

[0022] Each embodiment follows the control method, its steps:

[0023] 1) Carry out smelting, continuous casting into slabs, and clean up the surface of the continuous casting slabs;

[0024] 2) Heating the continuous casting slab in sections under a reducing atmosphere, and the heating time from the beginning of preheating to the furnace is controlled at 120 to 200 minutes;

[0025] Temperature control at each stage:

[0026] The furnace temperature in the preheating section is controlled at ≤730°C;

[0027] The furnace temperature in the first heating section is controlled at 1000-1080°C, and the hea...

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Abstract

The invention relates to a control method of decarburization of a continuously cast bloom for spring steel wire rods. The method comprises the following steps of: 1) performing smelting and continuous casting to form the bloom; 2) performing subsection heating on the continuously cast bloom under the reducing atmosphere; 3) rolling, wherein the rolling temperature is controlled at 960 to 1,010 DEG C; and 4) cooling the continuously cast bloom to room temperature, wherein the cooling velocity in two phase areas of austenite and ferrite is controlled at 15 DEG C per minute at least. The method can prolong the service cycle of springs, is suitable for producing the continuously cast bloom for the spring steel wire rods of any components, and does not produce full decarburization.

Description

technical field [0001] The invention relates to a production method for continuous casting slabs for spring steel wire rods, in particular to a method for controlling the decarburization of continuous casting slabs for spring steel wire rods, and is applicable to the production of continuous casting slabs for spring steel wire rods with any composition. Background technique [0002] In recent years, with the reduction in weight and performance of automobiles, the quality requirements for spring steel wire rods for automobiles have become higher and higher. Decarburization is the main surface defect of spring steel. Springs usually bear alternating loads or random loads. Fatigue damage or fatigue fracture is the main failure mode. Surface decarburization of spring steel will seriously damage the fatigue performance of springs, especially the surface The complete decarburization of ferrite can reduce the fatigue limit of the spring by 50%, and the fatigue life will decrease as...

Claims

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Application Information

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IPC IPC(8): C21D11/00C21D9/52
Inventor 李长胜熊建良程先舟褚双学盛光兴蒋跃东
Owner 武汉钢铁有限公司
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