Cooling method used for improving steel coil quality

Abstract

The invention discloses a cooling method used for improving the steel coil quality. The cooling method comprises the steps that molten steel is smelted, and a plate blank is obtained; the plate blankis heated; the heated plate blank is rolled, and a steel plate is obtained; the steel plate is reeled, and a hot rolling coil is obtained; the hot rolling coil is subjected to air cooling; and finally, the rolling coil subjected to air cooling is subjected to water cooling. The air cooling procedure and the water cooling procedure are carried out in sequence, the cooling speed is quickened, the technical problem that in the prior art, the hot coil high-temperature staying time is too long is solved, and the technical effects that the acid pickling quality is ensured, acid liquor is prevented from being excessively consumed, and the hot coil surface quality stability is ensured are achieved. Compared with normal rolling without adopting the method, under the condition that during water cooling coil acid pickling, the concentration and the temperature of the used acid liquor are not changed, the acid pickling speed can be improved by 30%.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a cooling method for improving the quality of steel coils. Background technique [0002] Long-process steel mills have a long cycle from raw materials to finished products, and the market conditions are unstable. Steel mills cannot effectively respond to urgent orders. As a result, the amount of carryover is increasing and cannot meet the delivery time requirements. In addition, the intermediate process of the urgent order, such as the cooling speed of the hot coil, puts forward new requirements, while the effect of the conventional mechanical ventilation cooling method is limited. If the hot coil stays at high temperature for too long, it is difficult to guarantee the quality of the hot coil oxide scale, which will affect the pickling quality. In addition, if the hot coil stays at high temperature for too long, it will also cause the thickness of the oxide scale to grow too...

AI Technical Summary

Problems solved by technology

[0003] By providing a cooling method for improving the quality of steel coils, the present invention solves the technical problem of too long residence time of hot coils at high temperature in the prior art, and realizes the guarantee of pickling quality, avoiding excessive consumption of acid solution and ensuring the cooling of hot coils The technical effect of the stability of the surface quality

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