Single-stander furnace rolling mill rolling plate shot-blasting pitted surface control method

Abstract

The invention discloses a single-stander furnace rolling mill rolling plate shot-blasting pitted surface control method. The method is characterized in that stability for controlling the ending of the high-temperature phosphorus removal of a single-stander furnace rolling mill rolled piece is realized by optimizing a steel sintering process of a heating furnace, optimizing the rolling process and optimizing the phosphorus removal process, so that a hot-rolled panel is uniform and blue, an overcooled zone caused by the phosphorus removal overlap ratio can be eliminated, the shot-blasted panel is uniform, smooth and free from water grains, the defects such as shot-blasting pitted surfaces can be controlled, and the hot-rolling state of the single-stander furnace rolling mill rolled piece and the quality of a shot-blasted surface can be improved.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a steel rolling process, in particular to a method for controlling shot blasting pitting of rolled plates in a single-stand furnace coil rolling mill. Background technique [0002] The shot blasting surface of the steel plate is mainly caused by the uneven pressing of the reddish-brown secondary oxide scale during the rolling process, and the surface of the steel plate is embossed and not smooth after shot blasting. Since such defects can only be found after shot blasting of the steel plate, the cycle time from production to discovery is long, and because such defects are widely distributed on the plate surface, manual grinding or repair welding is difficult, and the size after grinding is easily unqualified. With the continuous improvement of customers' requirements on the surface quality of steel plates at this stage, the quality objections caused by shot blasting pockmarks in major ste...

AI Technical Summary

Problems solved by technology

Since such defects can only be found after steel plate shot blasting, the cycle time from production to discovery is long, and because such defects are widely distributed on the plate surface, manual grinding or repair welding is difficult, and it is easy to cause unqualified dimensions after grinding

With the continuous improvement of customers' requirements for the surface quality of steel plates at this stage, the quality objections caused by shot blasting in major steel mills are increasing year by year, and the economic losses are huge.

Due to the single billet of the single-stand furnace coil rolling mill, the rolled piece is long and the rolled piece is exposed to the air for a long time during the rolling process. It is easy to form uneven reddish-brown secondary oxide scale and eventually cause shot blasting.

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