Method for preparing oriented silicon steel with asymmetrical rolling technique

A technology of asynchronous rolling and oriented silicon steel, applied in metal rolling, temperature control, tension/pressure control, etc.

Active Publication Date: 2013-05-01
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no relevant report on the introduction of asynchronous rol

Method used

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  • Method for preparing oriented silicon steel with asymmetrical rolling technique
  • Method for preparing oriented silicon steel with asymmetrical rolling technique
  • Method for preparing oriented silicon steel with asymmetrical rolling technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The experimental steel A is the Hi-B scheme, the chemical composition is shown in Table 1 (%), and the conventional hot-rolled strip steel production process (line) is adopted, and the characteristic is that the method for realizing asynchronous rolling is: for the roughing mill or the finishing mill, the work roll The rotating speed is the same, but the diameters of the upper and lower work rolls are different. The circumferential speed ratio of the upper and lower work rolls of the asynchronous rolling mill is 1:1.20. The billet heating temperature is 1360°C, and the rough rolling start temperature is 1350°C. It is divided into 5 hot rolling passes. The first two passes are asynchronous hot rolling. The rolling schedule is as follows: 240mm→144mm→100mm asynchronous hot rolling→72mm→54mm→ 40mm choose conventional or asynchronous hot rolling, the final rolling temperature is 1220°C; the finishing rolling stage is divided into 7 passes, the starting rolling temperature i...

Embodiment 2

[0016] Experimental steel B is low-temperature heating GO steel, and its chemical composition is shown in Table 2 (%). It adopts a conventional hot-rolled strip production process (line), and is characterized in that the method for realizing asynchronous rolling is: for rough rolling mill or finishing mill, The diameter of the lower work roll is the same, but the rotation speed of the work roll is different. The circumferential speed ratio of the upper and lower work rolls of the asynchronous rolling mill is 1:1.15. The billet heating temperature is 1280°C, and the rough rolling start temperature is 1280°C. It is divided into 5 passes of hot rolling. The first two passes adopt asynchronous hot rolling. The rolling procedure is as follows: asynchronous hot rolling is used between 240mm→144mm→100mm Select conventional or asynchronous hot rolling at →72mm→54mm→40mm, the final rolling temperature is 1140°C; the finishing rolling stage is divided into 7 passes, and the starting rol...

Embodiment 3

[0021] The chemical composition of the experimental steel C is GO steel is shown in Table 3 (%), using a conventional hot-rolled strip steel production process (line), which is characterized in that the method of realizing asynchronous rolling is: for the rough rolling mill or finishing mill, the upper and lower work The roll diameter is the same, and the friction coefficient between the upper and lower work roll surfaces and the rolled piece is changed. The circumferential speed ratio of the upper and lower work rolls of the asynchronous rolling mill is 1:1.10. The billet heating temperature is 1300°C, and the rough rolling start temperature is 1300°C. It is divided into 5 passes of hot rolling. The first two passes are asynchronous hot rolling. The rolling schedule is as follows: 240mm→144mm→100mm asynchronous hot rolling→72mm→54mm→ 40mm choose conventional or asynchronous hot rolling, the final rolling temperature is 1200 ℃; the finishing rolling stage is divided into 7 pas...

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Abstract

The invention relates to a method for preparing oriented silicon steel with an asymmetrical rolling technique for a roughing mill or a finishing mill. The method is characterized in that an asymmetrical rolling mode is comprehensively introduced in the rough rolling and finish rolling process of hot rolling: 1, all passes or the first two passes of the rough rolling stage adopt asymmetrical rolling and all passes or the last pass of asymmetrical rolling of the finish rolling; and 2, all passes or the first two passes of the rough rolling stage adopt asymmetrical rolling and all passes or the first pass and the last pass of asymmetrical rolling of the finish rolling. The method is as follows: 1) when the rotation speeds of working rolls are same, the asymmetry is realized through the difference of the diameters of a top working roll and a bottom working roll; 2) when the diameters of the top working roll and the bottom working roll are same, the asymmetry is realized through the difference of the rotation speeds of the working rolls; 3) when the diameters of the top working roll and the bottom working roll are same and the rotation speeds are same, the asymmetry is realized by changing the friction coefficient of the top and bottom working roll surfaces and a rolling piece; the circumferential speed ratio of the top working roll and the bottom working roll of an asymmetrical mill is 1:1.01-1:1.30, the total reduction rate of the rough rolling is at least 85 percent, and the pass reduction rate is 20-40 percent; and the total reduction rate of the finish rolling is at least 90 percent, and the pass reduction rate is 20-40 percent. The oriented silicon steel comprises the following ingredients by weight percent: 0.03-0.08 percent of C, 2.8-6.5 percent of Si, 0.05-0.2 percent of Mn, 0.013-0.035 percent of S, 0.01-0.05 percent of Al, 0.045-0.01 percent of N, at most 0.03 percent of P, 0.05-0.5 percent of Cu and the balance of Fe and other impurity elements.

Description

technical field [0001] The invention belongs to the production technology of oriented silicon steel in the field of metal processing, and in particular relates to a method for preparing GO and Hi-B two kinds of oriented silicon steel by means of asynchronous hot rolling. Background technique [0002] Oriented silicon steel is the main material for preparing various types of transformer cores. It requires high magnetic induction and low iron loss. This requires the development of secondary grains of oriented silicon steel strips and accurate grain orientation. [0003] The preparation of grain-oriented silicon steel includes various processes such as smelting, continuous casting, hot rolling, normalization, cold rolling, decarburization annealing, coating of release agent, high temperature annealing and insulating coating. According to the difference of magnetic induction value, it is divided into GO steel and Hi-B A kind of grain-oriented silicon steel has its own requiremen...

Claims

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Application Information

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IPC IPC(8): B21B1/22B21B37/74B21B37/48
Inventor 王国栋袁国
Owner NORTHEASTERN UNIV
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