Heat treatment technology of cold-rolled strip steel

A cold-rolled strip and process technology, applied in the field of heat treatment, can solve the problems of uneven cooling speed and hardness, reduced pickling efficiency, large residual stress, etc., to promote roughness, reduce difficult to be cleaned, and improve pickling effect. Effect

Inactive Publication Date: 2020-10-30
林璋
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Heat treatment technology of cold-rolled strip steel
  • Heat treatment technology of cold-rolled strip steel
  • Heat treatment technology of cold-rolled strip steel

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Embodiment 1

[0050] A heat treatment process for cold-rolled strip steel, comprising the following steps:

[0051] S1. Lead the molten steel into the casting slab in the continuous casting machine, control the casting speed to 35-50m / min, and then transport the casting slab to the heating furnace for heating;

[0052] S2. Use a tension leveler to pull out the cast slab, cool it at a rate of 50-100°C / s under nitrogen atmosphere conditions, use a coiler to roll it at a temperature of 550-600°C, and roll the cast slab Remove the scale, and re-coil the billet after the scale is removed, coated with an alumina release agent;

[0053] S3, heat-treating the cast slab coil coated with release agent in S2, followed by heat preservation for 10-20h and annealing, and removing the release agent on its surface;

[0054] S4. After the billet roll is re-rolled and the release agent is removed, it is put into a closed cycle pickling box, and hydrochloric acid is used to depick it, so as to improve the ut...

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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,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G3/02C21D1/26C21D1/68C21D9/52C23G1/08B21B1/22
CPCC23G3/02C21D1/26C21D9/52C21D1/68C23G1/08C23G1/088B21B1/22B21B2001/221
Inventor 林璋
Owner 林璋
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