Continuous casting blank hot charging and hot conveying process for preventing surface crack of steel plate

Abstract

The invention relates to a continuous casting blank hot charging and hot conveying process for preventing a surface crack of a steel plate under the condition of raising temperature of continuous casting blank hot charging, belonging to the technical field of metal material processing. The process comprises the following steps of: cutting a continuous casting blank on a cutting roller way, then introducing the cut continuous casting blank into a conveying roller way located between a continuous casting machine and a rolling mill, and spraying water and cooling the continuous casting blank quickly; reducing the temperature of the surface of the continuous casting blank to about 600 DEG C; controlling the cooling rate of the surface of the continuous casting blank to be 20-50 DEG C / s; controlling the cooling time of the surface of the continuous casting blank to be 15-60s; and cooling the continuous casting blank, and then introducing the cooled continuous casting blank to a heating furnace within 15min and heating. The process has the advantages that the temperature inside the continuous casting blank is ensured to be higher than 800 DEG C under the condition of ensuring the surface temperature of the continuous casting blank introduced into the heating furnace to be lower than 600 DEG C, therefore, the surface crack defect of the rolled steel plate is prevented, the waste heat of the continuous casting blank can be fully utilized, and the favorable energy saving effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a continuous casting slab hot charging and hot delivery process which can effectively avoid cracks on the surface of steel plates under the condition of relatively high continuous casting slab hot charging temperature. Background technique [0002] The continuous casting slab hot delivery and hot charging process is the operation that the continuous casting slab after continuous casting and cutting is immediately transported to the heating furnace or buffer device such as slab warehouse and heat preservation pit by railway or roller table, and loaded into the heating furnace at a higher temperature. The continuous hot delivery and hot charging process of continuous casting slabs can shorten the time of casting slabs in the furnace, increase the output of the heating furnace by about 30%, reduce the burning loss by 0.5% to 1.5%, and increase the yield ...

AI Technical Summary

Problems solved by technology

[0003] At present, the temperature of hot charging and hot delivery of continuous casting slabs is generally relatively low. Generally, after stacking or air cooling, the surface temperature of the continuous casting slabs is reduced to 400-600°C, and then the continuous casting slabs are sent to the heating furnace for heating. If higher If the furnace charging temperature is lower than the furnace loading temperature, crack defects are likely to appear on the surface of the steel plate after rolling, resulting in a decrease in the yield of the steel plate. At this time, the internal temperature of the continuous casting slab is also below 600°C, so the waste heat of the continuous casting slab itself cannot be effectively utilized.