Method for preventing hot rolling stainless steel band from rolling cuts and device thereof

Abstract

The invention relates to a method and a device used for preventing the rolling scratch of the hot rolling stainless steel belt. The method is that when in rolling, the compressed air is blown out from a row of nozzles arranged by the lightening vertical hole of the outlet guide decking of the last hot finisher, the extrusive airflow forms an air cushion which blows and floats the band steel, thereby causing the lower surface of the band steel to be separated from the nonmetal decking fixed on the outlet guide decking. The device comprises an outlet guide beam arranged on an outlet guide frame of the last hot finisher, wherein, the outlet guide beam is provided with a transverse air pipe, and the transverse air pipe is provided with a plurality of vertical nozzles, the air outlet ends of the nozzles stretch into the lightening vertical hole of a vertical grid frame of a lower guide plate body of the outlet guide decking; the lower part of the transverse air pipe is fixed with a vertical air pipe, and the lower end of the vertical air pipe is fixed with a bending pipe, the bending pipe is connected with a corrugated pipe, the corrugated pipe is connected with a fixed pipe, and the fixed pipe is connected with a blower. The method and the device used for preventing the rolling scratch of the hot rolling stainless steel belt thoroughly stop the scratch of the lower surface of the band steel by the guide plate.

Description

technical field [0001] The invention relates to a method and a device for preventing scratches during rolling of hot-rolled stainless steel strips. Background technique [0002] In hot-rolled strip mills, thermal scratches on the surface of the strip, especially on the surface of stainless steel, directly affect the quality of the product. The main reason is that the length of the plank at the exit of the last finishing mill is long, and the plank material of the conventionally designed exit guide is generally GS30Mn5V alloy steel or 45 steel, 1Cr18Ni9Ti stainless steel. Sassafras often causes the lower surface of the strip to be scratched by the planking. In 2003, the applicant had a large area of ​​scratches in hot continuous rolling, and lost 5,000 tons of 50 million yuan. In order to prevent the hot-rolled stainless steel strip from being scratched during rolling, the existing method is to use non-metallic flooring to reduce the friction between the stainless steel str...

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