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A method for controlling spot rust on the surface of strip steel in the continuous annealing path of cold rolling

A surface point and path technology, applied in the field of cold-rolled strip steel, can solve complex and comprehensive problems, different shapes, different causes and solutions, etc., and achieve the effect of reducing the rate of unqualified products

Active Publication Date: 2022-03-22
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 20us / 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 in 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 20us / 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 strip steel surface in the continuous annealing path of cold rolling, comprising: (1) process control in the cleaning section of the continuous annealing unit; (2) process control in the annealing section of the continuous annealing unit; The whole process control; (4) the control of the oiling section of the continuous annealing unit; (5) the control of the product in the middle of the continuous annealing off-line; Spot rust defects on the steel surface, and ultimately reduce the rate of defective products caused by spot rust.

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 Patents(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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