Straightening method of tempered steel plate

Abstract

The invention provides a straightening method of a tempered steel plate, and the method is characterized in that after a steel plate which is thermally treated is tempered, the steel plate is cooled to 140DEG C to 160DEG C on a thermal treatment cold bed, then the steel plate is conveyed by a roller bed to the front of a cold straightening machine, and the steel plate is enabled to enter the cold straightening machine to be straightened at the temperature of 80 to 100 DEG C; a small roll gap is set in the primary two passes, so that the steel plate is bent; and a large roll gap is set in a third pass, so that the steel plate is flattened. Due to the adoption of the method, the edge wave defects of the steel plate can be eliminated, the surface smoothness of the steel plate can be guaranteed, and the qualification rate of the steel plate shape can be improved by more than 30 percent.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled plate and strip steel, and in particular relates to a method for performing cold leveler straightening on a steel plate after heat treatment and tempering. Background technique [0002] At present, all the steel plates that enter the cold leveler for straightening are cold steel plates, that is, the steel plates after heat treatment and tempering are naturally cooled to room temperature, and then sent to the cold leveler for straightening. However, production practice has found that in the process of straightening cold heat-treated steel plates, for steel plates that have edge waves after tempering, especially thin-gauge steel plates with a thickness of 6-10mm, due to the uneven distribution of internal stress of the steel plates and the After straightening, the internal stress still cannot be released, so the steel plate after being straightened by the cold leveler still has edge wave defects,...

AI Technical Summary

Problems solved by technology

However, production practice has found that in the process of straightening cold heat-treated steel plates, for steel plates that have edge waves after tempering, especially thin-gauge steel plates with a thickness of 6-10mm, due to the uneven distribution of internal stress of the steel plates and the After straightening, the internal stress still cannot be released, so the steel plate after being straightened by the cold leveler still has edge wave defects, which directly affects the appearance quality of the steel plate