480MPa-grade galvanized strip steel and production method thereof

A production method and 480mpa technology, applied in hot dip plating, coating, metal material coating process, etc., can solve the problems of extremely high requirements for rapid cooling capacity, high cost of precious alloys, and no applicability, so as to improve The effect of solid solution strengthening, reducing the difficulty of production control, and reducing the probability of inclusion defects

Active Publication Date: 2017-11-07
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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Problems solved by technology

More importantly, in order to ensure the corrosion resistance of automobile sheets, the use of galvanized automobile sheets is also increasing year by year, especially the demand for galvanized automobile sheets with a tensile strength greater than or equal to 480MPa is increasing day by day; The method of galvanized automobile sheet greater than 480MPa is mainly a phase transformation strengtheni

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  • 480MPa-grade galvanized strip steel and production method thereof
  • 480MPa-grade galvanized strip steel and production method thereof
  • 480MPa-grade galvanized strip steel and production method thereof

Examples

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Example

[0016] Example 1-13: The final chemical composition of the 480MPa grade galvanized steel strip and the process conditions of the production method are as follows.

[0017] (1) The galvanized steel strip is prepared by converter smelting, LF refining, continuous casting, hot rolling, cold rolling, continuous annealing, and galvanizing processes. The chemical composition of the castings after the continuous casting process is shown in Table 1:

[0018] Table 1: Chemical composition of castings

[0019]

[0020] (2) Hot rolling process:

[0021] During the hot rolling process, the solid solution and precipitation of the second phase particles, the deformation and recrystallization of austenite, and the transformation of ferrite occur. Therefore, hot rolling is an important part of quality control; through heating temperature, final rolling temperature and coiling The joint setting of temperature and the control of the front cooling after finishing rolling can lead to the precipitation of...

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Abstract

The invention discloses 480MPa-grade galvanized strip steel. The 480MPa-grade galvanized strip steel comprises, by mass, 0.05-0.09% of C, 0.05% or less of Si, 0.8-1.0% of Mn, 0.016% or less of P, 0.008% or less of S, 0.015-0.035% of Nb, 0.020-0.045% of Als, 0.007% or less of N, 0.015-0.035% of Ti, 0.0015-0.0030% of Ca, and the balance Fe. A production method comprises the steps that converter smelting and LF refining are conducted in a low-nitrogen mode; protective continuous casting is conducted, and nitrogen is controlled to be increased; and calcium treatment is conducted after refining is completed, wherein the mass percent of acid-insoluble aluminum in molten steel is smaller than or equal to 45 ppm, the ratio of the mass percent of the acid-insoluble aluminum to that of calcium is 0.5-1.5, and the ratio of the mass percent of the acid-insoluble aluminum to that of acid soluble aluminum is 0.05-0.20. According to the 480MPa-grade galvanized strip steel, the production cost is low, the overall mechanical performance of the product is superior, and the surface quality meets the requirements of FB surface levels in GB2518 and EN10346.

Description

technical field [0001] The invention belongs to the technical field of metallurgical plate production, in particular to a 480MPa grade galvanized steel strip and a production method thereof. Background technique [0002] With the growth of automobile production, people pay more and more attention to the emission of automobile exhaust. The application of high-strength steel in automobiles, on the one hand, is conducive to realizing the lightweight of automobiles and reducing automobile exhaust emissions; on the other hand, it also improves the safety of people in the car. More importantly, in order to ensure the corrosion resistance of automobile sheets, the use of galvanized automobile sheets is also increasing year by year, especially the demand for galvanized automobile sheets with a tensile strength greater than or equal to 480MPa is increasing day by day; The method of galvanized automobile sheet greater than 480MPa is mainly a phase transformation strengthening method ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/06C22C38/14C21D8/02C23C2/06C23C2/26C23C2/40
CPCC21D8/0226C21D8/0263C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C23C2/06C23C2/26C23C2/40
Inventor 许斌石建强赵渭良刘守显孙海燕蒋建朋李守华杨西鹏
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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