Method for controlling spot rust on surface of strip steel during cold-rolling continuous annealing

A surface point and path technology, applied in the field of cold-rolled strip steel, can solve the problems of different causes and solutions, complex and comprehensive problems, and different shapes, so as to achieve the control of point rust defects and reduce the rate of unqualified products. Effect

Active Publication Date: 2020-09-15
ANGANG STEEL CO LTD
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Problems solved by technology

The appearance of defects is different, the causes and solutions are also different, which is a complex and comprehensive problem

Method used

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Embodiment Construction

[0016] A method for controlling spot rust on the surface of strip steel in the cold rolling continuous annealing path, comprising the following control process:

[0017] (1) Process control of the cleaning section of the continuous annealing unit: the conductivity of the hot water rinse tank is controlled below 20um / cm, the water temperature is controlled at 50-70°C, the pressure of the squeezing roller is controlled at 4-6bar, and the temperature of the outlet drying box is controlled at 140 ~160°C; the purpose is to prevent the residue of Na element in the cleaning section from forming a source of rust on the surface of the steel plate.

[0018] (2) Process control of the annealing section of the continuous annealing unit: the temperature of the final cooling water quenching tank is controlled below 60°C, the electrical conductivity is controlled below 20um / cm, and the pressure of the squeezing roller is controlled at 4-6bar; the purpose is to prevent the Ca element in the wa...

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Abstract

The invention relates to a method for controlling spot rust on the surface of strip steel during cold rolling continuous annealing. The method comprises the following steps: (1) controlling a cleaningprocess of a continuous annealing unit; (2) controlling an annealing process of the continuous annealing unit; (3) controlling a finishing process of the continuous annealing unit; (4) controlling anoiling process of the continuous annealing unit; and (5) carrying out intermediate product control after continuous annealing. According to the method, the spot rust defect on the surface of the strip steel during cold rolling continuous annealing is controlled through continuous annealing process adjustment and product warehouse area management, and finally the unqualified product rate caused bythe spot rust is reduced.

Description

technical field [0001] The invention relates to the technical field of cold-rolled strip steel, in particular to a method for controlling spot rust on the surface of strip steel in a cold-rolled continuous annealing path. Background technique [0002] With the improvement of users' requirements for the surface quality of cold-rolled strip steel, the control of surface defects of cold-rolled strip steel has attracted more and more attention, and its control level has become one of the key factors for whether it can be supplied to high-end users. Cold-rolled continuous annealing path steel plates are prone to spot rust defects on the surface during production and storage. Every year, unqualified products due to spot rust not only cause a lot of losses, but also cause adverse effects on subsequent use, affecting customers' trust in manufacturers. [0003] There are many factors affecting spot rust in the cold rolling and continuous rolling process, such as relative humidity, te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/02B21B45/00C21D1/26C21D9/573
CPCB21B45/0269B21B45/00C21D1/26C21D9/573
Inventor 孙荣生王静刘仁东辛利峰阮国庆吴乃强蔡顺达郭金宇刘英明洪天生
Owner ANGANG STEEL CO LTD
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