Early-warning method of pitting on strip steel surface in annealing unit

A pitting and strip steel technology, which is applied in furnaces, heat treatment equipment, heat treatment furnaces, etc., can solve problems such as increased production costs, prolonging the production cycle of units, and increasing user complaints, so as to prevent broken strips and suppress the occurrence of pitting , Improve the effect of surface quality

Active Publication Date: 2011-12-28
SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Pitting defects will lead to increased defective products, increased production costs, increased user complaints, and prolonged production cycle of units, which will eventually lead to loss of market share

Method used

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  • Early-warning method of pitting on strip steel surface in annealing unit
  • Early-warning method of pitting on strip steel surface in annealing unit
  • Early-warning method of pitting on strip steel surface in annealing unit

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Embodiment Construction

[0028] The present invention provides a method for early warning of pitting on the strip steel surface of an annealing unit. When setting the early warning value, in order to accurately reflect the severity of pitting on site, the following factors must be considered, and the specific implementation methods are as follows:

[0029] An early warning method for pitting on the strip steel surface of an annealing unit, which includes

[0030] Step 1, in the SF process section, the strip pitting depth value and the speed difference between the furnace roll and the strip form a linear relationship: an early warning model is established through linear regression, and this relationship can be described by the following formula:

[0031] Pocket depth = a+b×speed difference

[0032] Taking the difference of roll speed in the SF furnace of the cold rolling continuous annealing unit as the input variable, the estimated value of pitting depth is obtained. Among them, a and b are regressio...

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Abstract

The invention relates to an early warning method for pocking marks on the surface of strip steel of an annealing set. The early warning method for the pocking marks on the surface of the strip steel of the annealing set comprises the following steps of: keeping the depth value of the pocking marks of the strip steel in linear relation with speed difference of a furnace roller and the strip steel at an SF (Surface Flash) process section: establishing an early warning model through linear regression, wherein the relation can be described by using the following formula that: the depth of the pocking marks is equal to the sum of a and the product of b and the speed difference; the difference value of roller speed of an SF furnace roller of a cold-rolled continuous annealing set is used as an input variable to obtain an estimated value of the depth of the pocking marks; and a and b are regression coefficients; expressing by using the average speed of n furnace rollers during calculation of the speed of the strip steel in the SF furnace, wherein supposing that the speeds of the furnace rollers are v1, v2, ......, vn, the speed of the strip steel is equal to (v1+v2+......+vn)/n; and judging the quality of the pocking marks by extracting the wave peak characteristic of a curve. In the method, the depth of the pocking marks is set, and a peak value is used for warning, so that early warning of the pocking mark defect can be accurately realized.

Description

technical field [0001] The invention relates to a method for monitoring the quality of an annealing unit, in particular to an early warning method for the quality of strip steel in an annealing unit. Background technique [0002] One of the surface quality defects of the strip steel in the continuous annealing unit, "pockmarks", is relatively prominent. [0003] There are many factors in the generation of pitting defects. In the early stage of production, there will inevitably be some residual dust in the furnace, which will gradually decrease after several times of regular maintenance and cleaning; the dust caused by the friction of the roller surface coating and the steel plate is another cause of pitting. Pitting defects will lead to increased defective products, increased production costs, increased user complaints, and prolonged production cycle of units, ultimately leading to loss of market share. [0004] The dust in the furnace and the dust generated by the frictio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/52C21D9/68C21D11/00
Inventor 陈卫东陈平徐家倬
Owner SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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