Method of eliminating iron scale from surface of stainless steel

Abstract

The elimination of iron scale on surface of stainless steel plate is completed with several shot blasting machines. The present invention features that SM150-type steel grits are filled into the material bin of the shot blasting machines and used in eliminating iron scale on surface of stainless steel plate. The present invention has sanding coefficient of 1.1-1.2, throwing head rotation speed of shot blasting machines of 1850-2000 rpm, annealing temperature of the hot rolled stainless steel plate of 1125-1140 deg.c, the brush roller pressure current in the pickling zone after elimination of 20-30 A, the washing water pressure not lower than 5Br and the technological speed of the hot rolled stainless steel plate of 60-67 m / min. Three shot blasting machines have separated thrown portions for high eliminating effect, and the present invention has low scale eliminating medium consumption, low cost and low surface roughness of the eliminated stainless steel plate.

Description

technical field [0001] The invention relates to a method for removing iron scale on the surface of stainless steel. Background technique [0002] During the hot rolling process of stainless steel cold-rolled raw materials, dense oxide scales are formed on the surface of the steel plate, which seriously affects the cleaning effect during the pickling process. Now the method of removing iron scale on the surface of stainless steel is the steel shot descaling method, which is easy to cause the surface of the raw material Residual scale and increased roughness will affect the surface quality of finished products, and the effect of removing iron scale is poor. The surface roughness value of raw materials after pickling can reach more than 4μm, and the consumption per ton of steel shot is as high as 5Kg. Due to the quality of steel shot, At the same time, the iron scale on the surface of the raw material is not clean, and the steel shot dust is large, which increases the dust remo...

AI Technical Summary

Problems solved by technology

[0002] During the hot rolling process of stainless steel cold-rolled raw materials, dense oxide scales are formed on the surface of the steel plate, which seriously affects the cleaning effect during the pickling process. Now the method of removing iron scale on the surface of stainless steel is the steel shot descaler method, which is easy to cause the surface of the raw material Oxide scale residues and increased roughness affect the surface quality of finished products. The effect of iron scale removal is poor. The surface roughness value of raw materials after pickling reaches 4μm or more, and the steel consumption per ton of steel shot is as high as 5Kg. Due to the quality of steel shot, At the same time, the iron scale on the surface of the raw material is not clean, and the steel shot dust is large, which increases the dust removal pressure and further affects the surface quality of the raw material.