Method for controlling flat roll of cold-rolled dual-phase steel

Abstract

The invention relates to the technical field of cold-rolled dual-phase steel, in particular to a method for controlling flat rolling of cold-rolled dual-phase steel. The method specifically comprises the following steps: 1) optimizing the input time sequence of reel tracking water and wrapper roller cooling water: adopting a double feedback mode of strip steel head speed of 8-12m / s and temperature detection of 650-750 DEG C, in the laminar cooling process of strip steel, setting the coiling temperature of 100-150m at the head and tail of the strip steel to be 630 + / -20 DEG C, and setting the coiling temperature of other positions of 100-150m at the head and tail of the strip steel to be 530 + / -20 DEG C; 2) adjusting tension control parameters of the coiling machine, wherein the tension coefficient is 3-3.5, and the tension value is more than 35 Mpa; (3) the water cooling speed in the coiling machine is adjusted, wherein the water cooling speed of the hot coil in the coiling machine is controlled to be 15-20 DEG C / min; and (4) after coiling is completed, the tail position is stopped at the position which is minus 90 degrees away from the coil unloading position and stays in the machine for 30-60 seconds, the temperature difference between the middle and tail parts of the hot coil is reduced to be within 10 DEG C, and the tail part is clockwise rotated by 90 degrees and conveyed out during coil unloading. The occurrence rate of flat rolls is effectively reduced, the defect rate is reduced by 20%, the roll shape and plate shape quality is improved, the accident time is shortened, and the product quality is improved.

Description

technical field [0001] The invention relates to the technical field of cold-rolled dual-phase steel, in particular to a method for controlling cold-rolled dual-phase steel flat coils. Background technique [0002] Hot-rolled high-strength plate and advanced high-strength steel plate, as well as hot-rolled high-strength steel plate for special purposes. It is required to have high impact energy absorption, crush strength, fatigue performance, cold bending performance, and high strength; in addition to the above-mentioned good mechanical properties and formability, it should also have good welding performance, spot weldability, and corrosion resistance. , anti-aging stability, and performance uniformity and stability, good damping performance. [0003] However, there is a common problem in the production process of the above-mentioned steel plates: flat coils. Process flow of hot rolling line: heating → descaling after furnace → sizing machine → rough rolling → flying shear ...

AI Technical Summary

Problems solved by technology

[0003] However, there is a common problem in the production process of the above-mentioned steel plates: flat coils

At present, in the production of dual-phase steel, there are different degrees of flat coil defects, which makes it impossible to use direct scrapping or separate coils to remove the collapsed part, resulting in great economic losses.

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