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Non-oriented electrical steel plate without corrugated defect and its manufacturing method

A technology of oriented electrical steel sheets without corrugation, applied in the direction of inorganic materials such as magnetism, can solve the problems of high production costs, achieve the effects of easy adjustment, low implementation difficulty, and avoid precipitation

Active Publication Date: 2012-05-09
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is that the production cost is very high, and it is not suitable for middle and low grade silicon steel with low added value.

Method used

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  • Non-oriented electrical steel plate without corrugated defect and its manufacturing method
  • Non-oriented electrical steel plate without corrugated defect and its manufacturing method
  • Non-oriented electrical steel plate without corrugated defect and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The chemical composition of molten steel in the continuous casting tundish is controlled as follows: C: 0.001%, Si: 1.22%, Mn: 0.25%, P: 0.02%, S: 0.003%, Al: 0.33%, N: 0.001%, O: 0.004% , the balance is Fe and unavoidable inclusions. The average superheated degree of molten steel is 34.6°C, the casting speed is 1.07m / min, the specific cooling water volume is 185l / min, the slab temperature drop rate is 11.6min / °C, the surface temperature of the slab at the exit of the casting machine is 710°C, and the equiaxed crystal ratio is 43%. In the heating furnace, the temperature difference at the watermark point is 22°C, the residence time in the soaking section of the slab is 46min, and it is rolled after being heated at 1125°C×3h. The hot-rolled plate is rolled into a 0.5mm thick strip steel by a cold rolling method, and then continuously annealed in a dry atmosphere. There are no corrugated defects on the surface of the finished strip steel, iron loss: 4.743W / kg, magnetic i...

Embodiment 2

[0047] The chemical composition of molten steel in the continuous casting tundish is controlled as follows: C: 0.002%, Si: 1.42%, Mn: 0.30%, P: 0.06%, S: 0.002%, Al: 0.25%, N: 0.002%, O: 0.002% , the balance is Fe and unavoidable inclusions. The average superheated degree of molten steel is 31.4°C, the casting speed is 1.04m / min, the specific cooling water volume is 175l / min, the slab temperature drop rate is 9.6min / °C, the surface temperature of the slab at the exit of the casting machine is 680°C, and the equiaxed crystal ratio is 57%. In the heating furnace, the watermark point temperature difference is 22°C, the slab soaking section residence time is 48min, and rolled after being heated at 1135°C×3h, the finish rolling entrance temperature is 973°C, the final rolling temperature is 853°C, and the coiling temperature is 563°C. The hot-rolled plate is rolled into a 0.5mm thick strip steel by a cold rolling method, and then continuously annealed in a dry atmosphere. There ar...

Embodiment 3

[0049] The chemical composition of molten steel in the continuous casting tundish is controlled as follows: C: 0.002%, Si: 1.49%, Mn: 0.49%, P: 0.02%, S: 0.003%, Al: 0.59%, N: 0.001%, O: 0.002% , the balance is Fe and unavoidable inclusions. The average superheated degree of molten steel is 28.7°C, the casting speed is 0.99m / min, the specific cooling water volume is 189l / min, the slab temperature drop rate is 8.7min / °C, the surface temperature of the slab at the exit of the casting machine is 660°C, and the equiaxed crystal ratio is 63%. In the heating furnace, the temperature difference at the watermark point is 24°C, the residence time in the soaking section of the slab is 53min, and it is rolled after being heated at 1102°C×3h. The hot-rolled plate is rolled into a 0.5mm thick strip steel by a cold rolling method, and then continuously annealed in a dry atmosphere. There are no corrugated defects on the surface of the finished strip steel, iron loss: 3.559W / kg, magnetic in...

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Abstract

The invention relates to a non-oriented electrical steel plate without a corrugated defect and its manufacturing method. The steel plate is composed of the following chemical components by weight: less than 0.005% of C, 1.2-2.2% of Si, 0.2-0.4% of Mn, less than 0.2% of P, less than 0.005% of S, 0.2-0.6% of Al, less than 0.005% of N, less than 0.005% of O, and the balance Fe. The method comprises the steps of: subjecting the chemical components to molten iron pretreatment, converter smelting, RH refining and continuous casting so as to obtain a plate blank, and controlling the amount of continuous casting secondary cooling water, with the specific water flow of the cooling water maintained at 100-190l / min and the average superheat degree of continuous casting molten steel kept at 10-45DEG C; conducting heating and hot rolling to the plate blank, and making the tapping temperature of the plate blank at 1050-1150DEG C, and keeping the temperature difference between any two points along the length direction of the plate blank lower than 25DEG C during heating, with the hot rolling composed of rough rolling and finish rolling, the inlet temperature of which is controlled higher than orequal to 970DEG C; carrying out pickling, cold rolling, annealing and coating, thus obtaining the finished product of a non-oriented electrical steel plate. By controlling the cooling speed of the plate blank during continuous casting, the temperature difference along the length direction of the plate blank inside a heating furnace, as well as the temperature drop before finish rolling of the plate blank, the method of the invention realizes no corrugated defect.

Description

technical field [0001] The invention relates to a non-oriented electrical steel sheet and a manufacturing method thereof, in particular to a medium-grade non-oriented electrical steel sheet with excellent magnetic properties and no corrugated defects and a manufacturing method thereof. Background technique [0002] For non-oriented electrical steel sheets with high silicon content, uneven corrugations will appear on the surface of the finished strip along the rolling direction, similar to corrugations, commonly known as "corrugated defects". This defect can significantly reduce the lamination coefficient of the finished strip, resulting in deterioration of the magnetic properties of the finished strip and a decrease in the interlayer resistance of the insulating film, thereby reducing the service performance and life of the end product. Therefore, the vast majority of users clearly require that corrugated defects are not allowed in the finished strip. [0003] The mechanism...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C33/04C21D8/12
CPCC21D8/1277C21D8/1272C21D2201/05H01F1/16B22D11/182C22C38/04C21D8/1233C23F17/00C21D8/1222C22C38/001B22D11/225C21D6/008C22C38/02C21D8/12C21D8/1205C22C38/06B22D25/00C22C38/004C22C38/002
Inventor 张峰陈晓曹伟孙业中马长松朱简如陈卓雷刘献东
Owner BAOSHAN IRON & STEEL CO LTD
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