Non-oriented silicon steel for sheet billet production and manufacturing method thereof

A technology of oriented silicon steel and a manufacturing method, applied in the production field of non-oriented silicon steel, can solve the problems of poor reduction effect of iron loss, etc., and achieve the effect of reducing iron loss value, meeting the requirements of punching processing, and good hot-rolled structure.

Inactive Publication Date: 2020-01-31
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantage that the iron loss reduction effect of the obtained silicon steel product is relatively poor when the existing thin slab continuous casting and rolling is used to produce non-oriented silicon steel, and provides a non-oriented silicon steel produced by thin slab and its Manufacturing method

Method used

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  • Non-oriented silicon steel for sheet billet production and manufacturing method thereof
  • Non-oriented silicon steel for sheet billet production and manufacturing method thereof
  • Non-oriented silicon steel for sheet billet production and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0055] The chemical composition weight percent of present embodiment test steel is as image 3 As shown, the test steel was continuously cast into a 75mm slab after molten iron pretreatment, converter smelting, and vacuum treatment. The impurity elements C+S+N+Ti totaled 65ppm. After 0.5h, continuous hot rolling is carried out. The reduction rate of the first pass of hot rolling is controlled at 56%, the reduction rate of the second pass is controlled at 58%, and the final rolling temperature is kept at 800°C. The coil is rolled and coiled, and the coiling temperature is 760°C. The hot-rolled sheet after coiling is pickled and then cold-rolled to a thickness of 0.50mm, then annealed at 760°C for 45s, protected by nitrogen-hydrogen mixture, and the strip is treated according to the elongation rate of 5% before coating the insulating layer. The steel is leveled, coated with insulating coating, dried and cured at 450°C×15s, protected with nitrogen, and then stress-relieved annea...

Embodiment 2

[0057] The chemical composition weight percent of present embodiment test steel is as image 3 As shown, the test steel was continuously cast into a 75mm slab after molten iron pretreatment, converter smelting, and vacuum treatment. The impurity elements C+S+N+Ti totaled 62ppm. After 0.5h, hot rolling is carried out. The reduction rate of the first pass of hot rolling is controlled at 58%, the reduction rate of the second pass is controlled at 58%, and the final rolling temperature is kept at 800°C. rolling. The coiling process was performed, and the coiling temperature was 800°C. The hot-rolled sheet after coiling is pickled and then cold-rolled to a thickness of 0.50mm, then annealed at 780°C for 45s, protected with nitrogen-hydrogen mixture, and treated with an elongation of 4% before coating the insulating layer. The steel is leveled, coated with insulating coating, dried and cured at 450°C×15s, protected with nitrogen, and then stress-relieved annealed at 750°C×2h to ob...

Embodiment 3

[0059] The chemical composition weight percent of present embodiment test steel is as image 3 As shown, the test steel was continuously cast into a 70mm slab after molten iron pretreatment, converter smelting, and vacuum treatment. The impurity elements C+S+N+Ti totaled 80ppm. After 1 hour, hot rolling is carried out, the reduction rate of the first pass of hot rolling is controlled at 55%, the reduction rate of the second pass is controlled at 60%, the final rolling temperature is kept at 750°C, and hot rolled into 2.0mm thick hot rolled roll. The coiling process was performed, and the coiling temperature was 700°C. The hot-rolled sheet after coiling is pickled, then cold-rolled to a thickness of 0.50mm, and then annealed at 750℃×40s. Due to the high content of C, in order to ensure that the performance of the finished product does not cause magnetic aging, humidification is added during the annealing process to achieve For the purpose of decarburization, nitrogen-hydrogen...

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Abstract

The invention discloses non-oriented silicon steel for sheet billet production and a manufacturing method thereof and belongs to the technical field of production of non-oriented silicon steel. The non-oriented silicon steel comprises the chemical components in percent by weight: less than or equal to 0.005% of C, less than or equal to 1.50% of Si, greater than or equal to 0.40% but less than or equal to 0.70% of Mn, greater than or equal to 0.050% but less than or equal to 0.55% of Als, greater than or equal to 0.0010% but less than or equal to 0.0030% of S, greater than or equal to 0.0010% but less than or equal to 0.0030% of N, less than or equal to 0.0015% of Ti and the balance Fe and inevitable impurities. By carrying out process treatment such as smelting, continuous casting, heating, hot continuous rolling, rolling, pickling, cold rolling, product annealing, straightening and withdrawing, insulating layer coating and stress-relief annealing on the raw materials of the componentsby adopting a sheet billet production flow, the non-oriented silicon steel which is low in iron loss and high in magnetic polarization with the Si content of being less than 1.5% and the Al content of being within 0.05-0.5% is obtained under a condition of not adding noble metals. After stress-relief annealing, the decreasing proportion of the iron loss is relatively high, so that the electromagnetic property of the non-oriented silicon steel can be further improved.

Description

technical field [0001] The invention relates to the technical field of non-oriented silicon steel production, and more specifically relates to a non-oriented silicon steel produced from a thin slab and a manufacturing method thereof. Background technique [0002] Non-oriented silicon steel, also known as non-oriented electrical steel, is a Si-Fe alloy with very low carbon content, which is widely used in motors, transformers and other products. The main magnetic indicators of non-oriented silicon steel are iron loss and magnetic induction intensity. Its magnetic properties are not only directly related to the loss of electric energy, but also determine the performance, volume, weight and cost of products such as motors and transformers. Therefore, in order to meet the miniaturization and low energy consumption requirements of motors, transformers and other products, it is necessary to further improve their magnetic properties. [0003] At present, the existing technological...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C21D1/26C21D1/30C21D8/12C21D3/04
CPCC21D1/26C21D1/30C21D3/04C21D8/1222C21D8/1233C21D8/1255C21D8/1272C22C38/001C22C38/004C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 夏雪兰裴英豪施立发王立涛祁旋胡柯武战军占云高
Owner MAANSHAN IRON & STEEL CO LTD
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