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A method for eliminating surface crack defects of non-oriented electrical steel

A technology of grain-oriented electrical steel and surface cracks, applied in the field of electrical steel rolling, can solve the problems that users cannot use it normally, affect the surface quality of strip steel, and affect the market competitiveness of products.

Active Publication Date: 2018-08-10
SHOUGANG ZHIXIN QIAN AN ELECTROMAGNETIC MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

see figure 1 , the crack defect is in the form of a small pit-like crack with a depth of about 20 μm, mainly concentrated in the 200mm area of ​​the edge of the steel plate, and irregularly distributed on both sides, affecting the surface quality of the strip steel, degrading the product, causing users to be unable to use it normally, and affecting the quality of the product Market Competitiveness

Method used

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  • A method for eliminating surface crack defects of non-oriented electrical steel
  • A method for eliminating surface crack defects of non-oriented electrical steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]The Si content of the non-oriented electrical steel is 0.7wt%, and the P content is 0.05wt%. During normalized pickling, control the dew point of the normalizing furnace at 0°C, the normalizing temperature at 900°C, the normalizing speed at 40m / min, and the normalizing tension at 9N / mm 2 , controlled shot blasting speed 65m / s, pickling temperature 70°C, hydrochloric acid concentration 50g / L, pickling time 100s, normalized furnace pressure 20Pa, normalized rolling, no cracks on the strip surface, and good surface quality non-oriented Electrical steel.

Embodiment 2

[0038] The Si content of the non-oriented electrical steel is 1.6wt%, and the P content is 1.0wt%. During normalized pickling, control the dew point of the normalizing furnace to -30°C, the normalizing temperature at 990°C, the normalizing speed at 55m / min, and the normalizing tension at 12N / mm 2 , controlled shot blasting speed 75m / s, pickling temperature 85°C, hydrochloric acid concentration 115g / L, pickling time 60s, normalized furnace pressure 50Pa, normalized rolling, no cracks on the strip surface, and good surface quality non-oriented Electrical steel.

Embodiment 3

[0040] The Si content of the non-oriented electrical steel is 1.2wt%, and the P content is 0.08wt%. During normalized pickling, control the dew point of the normalizing furnace to -10°C, the normalizing temperature at 950°C, the normalizing speed at 50m / min, and the normalizing tension at 10N / mm 2 , controlled shot blasting speed 70m / s, pickling temperature 80°C, hydrochloric acid concentration 80g / L, pickling time 80s, normalized furnace pressure 35Pa, normalized rolling, no cracks on the strip surface, and good surface quality non-oriented Electrical steel.

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Abstract

The invention discloses a method for eliminating non-oriented electrical steel surface crack defects and belongs to the technical field of electrical steel rolling. The method is applicable to the non-oriented electrical steel with the Si content being 0.7wt%-1.6 wt% and the P content being 0.05wt%-0.1 wt%. Specifically, during normalizing and pickling, the dew point of a normalizing furnace is controlled below 0 DEG C, the normalizing temperature is controlled below 1000 DEG C, the normalizing tension is controlled at 9-12 N / mm<2>; and the shot blasting speed is controlled at 65-75 m / s. According to the method, by improving the normalizing and pickling process and strictly controlling process parameters, under the collaborative effect of the process conditions of the dew point of the normalizing furnace, the normalizing temperature, the normalizing tension and the shot blasting speed, influences of normalizing and pickling on the surface quality of the non-oriented electrical steel can be reduced, the surface crack defects of rolled belt steel are eliminated, the non-oriented electrical steel good in surface quality is obtained, and therefore the product market competitiveness is improved.

Description

technical field [0001] The invention relates to the technical field of electrical steel rolling, in particular to a method for eliminating surface crack defects of non-oriented electrical steel. Background technique [0002] The surface quality of non-oriented electrical steel is one of the important indicators of electrical steel products. Under the situation of increasingly fierce market competition and continuous improvement of users' requirements for product quality, surface quality has become a key indicator to ensure batch, stable and reasonable cost production of electrical steel products, which affects users' intuitive experience of products and affects the fulfillment of final orders. [0003] Crack defects are mainly concentrated on non-oriented electrical steel with Si content of 0.7wt%-1.6wt% and P content of 0.05wt%-0.1wt%. The degree is obvious. see figure 1 , the crack defect is in the form of a small pit-like crack with a depth of about 20 μm, mainly conce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D6/00C22C38/02
CPCC21D6/008C22C38/002C22C38/02
Inventor 刘中华宋燕燕胡志远王付兴刘磊张伟朱江波李泽琳
Owner SHOUGANG ZHIXIN QIAN AN ELECTROMAGNETIC MATERIALS CO LTD
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