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Method for producing oriented silicon steel by using pickling continuous-rolling mill

A technology of oriented silicon steel and continuous rolling mill, applied in the field of steel rolling, which can solve the problems of increased cooling rate of the edge surface, easy oxidation of the heated surface, and brittleness of the edge of the steel plate, so as to avoid micro cracks, avoid high brittleness, and uniform cooling Effect

Active Publication Date: 2009-10-07
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to prevent edge cracking and broken strips, it has been proposed to heat the edge surface of the steel plate after trimming or at the entrance of the rolling mill by means of laser beam irradiation, flame heating or induction heating to remove the embrittlement zone and micro cracks at the edge, but When heating, it is difficult to completely shield the air
If the shielding conditions are not complete, the heated surface is easy to oxidize, which will make the material brittle
In addition, when implemented on a continuous production line, the heating intensity must be adjusted as the speed of the production line changes, otherwise the heating cannot be maintained at a certain temperature.
Moreover, there is a temperature difference in the width direction of the plate, especially the cooling rate of the surface layer of the edge becomes larger, and the edge of the steel plate becomes brittle.
There are certain disadvantages in these methods, and it is not easy to apply in actual production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take the oriented silicon steel hot-rolled coil containing 2.8% silicon as an example. When the hot-rolled coil is naturally cooled to a temperature of 52°C at the end of the coil, uncoiling, welding, and pickling are performed, and the internal temperature of the looper is 43°C; Edge trimming; before the steel strip enters the first rolling mill, it is heated by a hot air dryer, so that the temperature of the steel strip entering the rolling mill reaches 80°C, and then cold rolling is carried out, and finally coiled.

Embodiment 2

[0019] Take the oriented silicon steel hot-rolled coil containing 3.0% silicon as an example. After the hot-rolled coils are naturally cooled to room temperature, they are stacked among the high-temperature coils. When the temperature at the end of the coil is 58°C, uncoil, weld, and pickle, and the internal temperature of the loop is 51°C; Before edge trimming, it is heated to 76°C by a hot air dryer for edge trimming; before the steel strip enters the first rolling mill, it is heated by a hot air dryer to make the temperature of the steel strip reach 85°C for continuous cold rolling. The thickness is 0.74mm, coiled.

Embodiment 3

[0021] Take oriented silicon steel hot-rolled coil containing 3.2% silicon as an example. After the hot-rolled coil is naturally cooled to room temperature, it is heated with hot water. When the end temperature of the coil is 60°C, it is uncoiled, welded, and pickled. The internal temperature of the loop is 55°C; , heated to 80°C by a hot air dryer, and trimmed; before the steel strip enters the first rolling mill, it is heated by a hot air dryer, so that the temperature of the steel strip reaches 85°C, and cold rolling is carried out until the thickness is 0.74mm , coiled.

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PUM

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Abstract

The invention provides a method for producing oriented silicon steel by using a pickling continuous-rolling mill, which can solve the problem of strip breakage. The method comprises pickling and continuous rolling and is characterized in that the uncoiling temperature of a hot-rolled coil is controlled between 50 DEG C and 80 DEG C at a pickling section, and the internal temperature of a kink is controlled between 40 DEG C and 60 DEG C; a steel strip is integrally heated before edge cutting, and the temperature of the steel strip is higher than 60 DEG C; and the steel strip is integrally heated again before entering in the continuous-rolling mill, so that the temperature of the steel strip at a feeding opening of the continuous-rolling mill is higher than 80 DEG C. The method can effectively avoid the phenomenon of strip breakage in the cold continuous rolling process of the steel strip so as to achieve the purpose that the method for producing the oriented silicon steel by using the continuous-rolling mill is applied to the large-scale industrial production, the productivity and the yield of cold rolling of the oriented silicon steel are greatly improved, the capacity is improved, and the equipment investment and the manpower input are reduced.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a method for controlling broken strips of oriented silicon steel produced by a pickling cold continuous rolling unit. Background technique [0002] According to the rolling method, silicon steel sheet can be divided into hot-rolled silicon steel sheet and cold-rolled silicon steel sheet, and cold-rolled silicon steel sheet can be divided into oriented silicon steel sheet and non-oriented silicon steel sheet according to the grain orientation. Grain-oriented silicon steel sheet usually refers to a single-oriented silicon steel sheet with Gaussian texture, characterized by (110) crystal plane / / rolling surface, [001] crystal direction / / rolling direction. The silicon content in oriented silicon steel is generally 2.8% to 3.4%. As the silicon content increases, the yield strength and tensile strength of the steel increase significantly (when the mass fraction of sili...

Claims

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Application Information

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IPC IPC(8): C21D8/02B21B37/74
Inventor 蒋奇武金文旭张静付勇军游清雷罗理李元华
Owner ANGANG STEEL CO LTD