Annealing method for preventing selective oxidation of surface of cold-rolled high-strength steel
A high-strength steel, selective technology, applied in the field of high-strength steel annealing, can solve the problems that affect the appearance of the product, such as the paintability of the steel plate, and achieve the effect of preventing surface selective oxidation
Inactive Publication Date: 2020-08-28
ANGANG STEEL CO LTD
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Problems solved by technology
However, since the cold-rolled high-strength steel sheet contains more alloying elements such as Si and Mn, during the continuous annealing production process, the affinity between the alloying elements and oxygen is stronger than that of the matrix, and selective oxidation occurs, and the surface tends to show obvious oxidation color, which is serious It affects the aesthetics of the product and the subsequent paintability of the steel plate
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[0012] An annealing method for preventing selective oxidation of the surface of cold-rolled high-strength steel according to the present invention is applicable to cold-rolled high-strength steel above the 980MPa level; the annealing of the cold-rolled high-strength steel includes the following control process:
[0013] (1) The annealing temperature and strip speed control of each section in the continuous annealing furnace: the temperature of the heating section is 790-820°C, the temperature of the soaking section is 820-850°C, the temperature of the slow cooling section is 680-700°C, and the temperature of the fast cooling section is 220-240 ℃, the temperature in the aging section is 300-350℃, the temperature in the final cooling section is 100-120℃, and the strip speed is controlled at 80-100m / min; reasonable matching of temperature and strip speed can effectively avoid the diffusion behavior of alloying elements to the surface.
[0014] (2) Control of the dew point and oxyg...
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The invention relates to an annealing method for preventing selective oxidation of the surface of cold-rolled high-strength steel, and is suitable for cold-rolled high-strength steel above 980MPa. Theannealing of cold-rolled high-strength steel comprises the following control processes of (1) control in each section of annealing temperature and band steel speed in a continuous annealing furnace;(2) control in each section of dew point and oxygen content in the continuous annealing furnace; (3) rapid cooling section control; and (4) control of a water quenching tank. The annealing method effectively prevents the selective oxidation of the surface of cold-rolled high-strength steel through the control in each section of related process parameters such as temperature, dew point and electrical conductivity in the continuous annealing furnace.
Description
technical field [0001] The invention relates to the technical field of high-strength steel annealing, in particular to an annealing method for preventing selective oxidation on the surface of cold-rolled high-strength steel Background technique [0002] In order to meet the requirements of automobile lightweight, low energy consumption, low emission and safety performance, and improve the market competitiveness of automobile steel itself, cold-rolled high-strength steel has been vigorously developed. In order to obtain higher strength and good comprehensive formability, cold-rolled high-strength steel usually adopts a composite strengthening method combining solid solution strengthening, phase transformation strengthening and precipitation strengthening. This strengthening method requires cold-rolled high-strength steel to form a multi-phase composite microstructure during the annealing process, so alloying elements such as Si, Mn and other alloying elements are widely used ...
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IPC IPC(8): C21D1/26C21D9/573C21D1/74C21D1/63C21D11/00
CPCC21D1/26C21D9/573C21D1/74C21D1/63C21D11/00C21D11/005
Inventor 孙荣生王静刘仁东辛利峰蔡顺达刘英明吴乃强阮国庆金晓龙
Owner ANGANG STEEL CO LTD