Heat treatment technology of cold-rolled strip steel

Abstract

The invention discloses a heat treatment technology of cold-rolled strip steel, and belongs to the technical field of heat treatment. According to the scheme, a semiconductor refrigeration sheet is started to refrigerate a hydrochloric acid solution, so that the temperature of the hydrochloric acid solution is maintained to be -5 DEG C; when acid pickling balls make contact with a casting blank roll, built-in rubber balloons quickly expand, on the one hand, the hydrochloric acid solution in the acid pickling balls can be squeezed out so that the casting blank roll is subjected to acid pickling, and on the other hand, a magnetic shielding state of built-in magnetic balls can be released because insulating hemispheres are away from one another; by means of the attraction action of a magnet on the built-in magnetic balls and the reset action of elastic traction ropes, the acid pickling balls can be pulled to move upwards to the upper side of a partition plate, and along with contraction of the built-in rubber balloons, the hydrochloric acid solution is sucked into the acid pickling balls through L-shaped flow guide holes, so that the built-in magnetic balls are in the magnetic shielding state again; and the acid pickling balls move downwards along with the increase of the mass, so that continuous acid pickling of the casting blank roll is carried out.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a heat treatment process for cold-rolled strip steel. Background technique [0002] Cold-rolled steel strips and thin plates generally have a thickness of 0.1-3mm and a width of 100-2000mm; both use hot-rolled steel strips or steel plates as raw materials, and are rolled into products by cold rolling mills at room temperature. Cold-rolled strip heat treatment refers to the operation process of changing the structure of the metal or alloy through heating, heat preservation and cooling of the workpiece, so as to obtain the expected properties (such as mechanical properties, processing properties, physical properties and chemical properties, etc.) called heat treatment. [0003] In order to make metal workpieces have the required mechanical properties, physical properties and chemical properties, in addition to reasonable selection of materials and various forming processes,...

AI Technical Summary

Problems solved by technology

Therefore, the main consequences of uneven cooling rate are uneven hardness, uneven deformation, large and uneven residual stress, which may lead to excessive quenching deformation or cracking in severe cases

[0005] At present, in the process of heat treatment of cold-rolled strip steel, it is necessary to pickle the billet coil, usually using hydrochloric acid, but in the actual pickling process, because the billet coil itself is at a high temperature, it is easy to promote the volatilization of hydrochloric acid , so that the efficiency of pickling is reduced

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