Method for controlling side turning of hot rolling stainless steel band

Abstract

A method for controlling side turning of a hot rolling stainless steel band belongs to the metallurgy field. The method is characterized in that regarding a rough rolling vertical roll, the side pressure of a first pass is smaller than and equal to 200KN, the side pressure of a third pass is from 300KN to 800KN, and the side pressure of a fifth pass is from 100KN to 300KN. Regarding a rough rolling flat roll, the reduction rate of a first pass is 54.1%, the reduction rate of a second pass is 44.5%, the reduction rate of a third pass is 33.8%, the reduction rate of a fourth pass is 23%, and the reduction rate of a fifth pass is 14.1%. By means of reasonable control of flow deformation of metal in the process of stainless steel hot rolling, the method for controlling side turning of the hot rolling stainless steel band controls rough rolling and broadsiding in an appropriate range, effectively controls the side turning width of the stainless steel band, reduces trimming amount of cold rolling finished products, and improves yield of the cold rolling finished products.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for controlling side rollover of a hot-rolled stainless steel strip. Background technique [0002] Stainless steel has the characteristics of good corrosion resistance, high temperature resistance, low temperature resistance, wear resistance and exquisite appearance. It has a wide range of uses and plays an important role in aerospace, petrochemical, marine development and household and civil use. [0003] At present, the stainless steel production process is mainly as follows: steelmaking → continuous casting → hot rolling → annealing and pickling of raw materials → cold rolling → annealing and pickling of finished products → trimming of finished products, packaging and delivery to warehouse. [0004] Since the side of the stainless steel continuous casting slab is not ground, there are vibration marks and wrinkles on the surface. After being heated and oxidized at...

AI Technical Summary

Problems solved by technology

[0004] Since the side of the stainless steel continuous casting slab is not ground, there are vibration marks and wrinkles on the surface. After being heated and oxidized at a high temperature in the heating furnace, the surface is rough. After multi-pass rolling with vertical rolls and flat rolls, the slab is rolled from a thickness of 200mm to 3~5mm. Thick hot-rolled coils, after thinning, the side metal is turned over to the surface of the strip, forming rough strips along the sides of the strip, which cannot be eliminated after cold rolling. In order to ensure the surface quality of cold-rolled finished products, generally The rough strip is cut off before delivery, so the rollover width of the strip edge directly affects the trimming amount of the cold-rolled finished product, and affects the yield of the cold plate

Before adopting this control method, the unilateral rollover width of the stainless steel edge is generally controlled at 13-16mm, which can only be cut off after cold-rolled finished products, resulting in large metal loss. Therefore, how to reduce the rollover width is an urgent issue. to be solved

Images