Fast heat treatment method for controlling magnetic property of double-roller thin-strip casting non-oriented silicon steel

A twin-roll thin strip continuous casting and rapid heat treatment technology, applied in the field of metallurgy, can solve the problems of less research on control methods, affecting the magnetic properties of non-oriented silicon steel, etc., to achieve the easy realization of rapid heat treatment technology, obvious magnetic properties of products, and rapid heat treatment. technically simple effect

Inactive Publication Date: 2014-12-03
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, during the production of silicon steel by twin-roll thin strip continuous casting, there are few studies on the control methods affecting the magnetic properties of non-oriented silicon steel, especially the control methods for its structure and texture.

Method used

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  • Fast heat treatment method for controlling magnetic property of double-roller thin-strip casting non-oriented silicon steel
  • Fast heat treatment method for controlling magnetic property of double-roller thin-strip casting non-oriented silicon steel
  • Fast heat treatment method for controlling magnetic property of double-roller thin-strip casting non-oriented silicon steel

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Experimental program
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Effect test

Embodiment 1

[0023] 1. Non-oriented silicon steel is prepared according to the mass percentage of chemical composition: C: 0.0032%, Si: 1.39%, Mn: 0.20%, Al: 0.32%, O: 0.0043%, S: 0.004%, N: 0.0072%, and the rest is Fe and unavoidable impurities; the non-oriented silicon steel is smelted into molten steel, the pouring temperature is controlled at 1560±2°C, and the molten steel is poured into the molten pool of the twin-roll strip continuous casting machine through the tundish, and the molten pool is formed by the rotating steel roll Composed of side sealing plates, the molten steel solidifies and forms rapidly after contacting the crystallized roll surface of the steel roll, and a cast strip with a thickness of 2.5±0.3mm is obtained. The cast strip structure is single-phase ferrite, which is uneven along the thickness direction. The surface layer is a larger columnar crystal with an average grain size of about 360 μm, such as figure 1 shown;

[0024] 2. Air-cool the cast strip to 699±1°C ...

Embodiment 2

[0031]1. Non-oriented silicon steel is prepared according to the mass percentage of chemical composition: C: 0.0032%, Si: 1.23%, Mn: 0.41%, Al: 0.20%, O: 0.0043%, S: 0.0042%, N: 0.0052%, and the rest is Fe and unavoidable impurities; the non-oriented silicon steel is smelted into molten steel, the pouring temperature is controlled at 1598±2°C, and the molten steel is poured into the molten pool of the twin-roll strip continuous casting machine through the tundish, and the molten pool is formed by the rotating steel roll Composed of side sealing plates, molten steel solidifies and forms rapidly after contacting the crystalline roll surface of the steel roll, and a cast strip with a thickness of 2.5±0.1mm is obtained. The cast strip structure is single-phase ferrite, and the surface layer and the middle and lower layers are fine and equiaxed crystal, the subsurface layer is columnar crystal, the average grain size is about 400μm;

[0032] 2. Air-cool the cast strip to 601±1°C be...

Embodiment 3

[0039] 1. Non-oriented silicon steel is prepared according to the mass percentage of chemical composition: C: 0.0032%, Si: 0.52%, Mn: 0.35%, Al: 0.40%, O: 0.0043%, S: 0.0035%, N: 0.0052%, and the rest is Fe and unavoidable impurities; the non-oriented silicon steel is smelted into molten steel, the pouring temperature is controlled at 1542±2°C, and the molten steel is poured into the molten pool of the twin-roll strip continuous casting machine through the tundish, and the molten pool is formed by the rotating steel roll Composed of side sealing plates, molten steel solidifies and forms rapidly after contacting the crystallized roll surface of the steel roll, and obtains a cast strip with a thickness of 2.5±0.2mm. The cast strip structure is single-phase ferrite, and the cast strip structure is uneven. The surface layer is Fine equiaxed crystals, the subsurface layer is coarse columnar crystals, the average grain size is about 390μm;

[0040] 2. Air-cool the cast strip to 501±...

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Abstract

The invention belongs to the technical field of metallurgy and provides a fast heat treatment method for controlling the magnetic property of double-roller thin-strip casting non-oriented silicon steel aiming at enhancing the magnetic property of non-oriented silicon steel. The fast heat treatment method comprises the following steps: pouring molten non-oriented silicon steel into a double-roller thin-strip casting machine through a tundish to cast a casting strip with the thickness of 2.5+ / -0.3 mm; cooling the casting strip, then coiling, pickling the coiled casting strip, and then directly carrying out first-stage cold rolling to obtain a thin strip of 0.5 mm; and fast annealing the thin strip after the first-stage cold rolling, and removing the residual stress of the annealed thin strip by adopting stress relief annealing after punching to obtain a non-oriented silicon steel finished product. The magnetic property of the non-oriented silicon steel finished product is as follows: an iron loss value is P15 / 504.76-7.34 W / kg, and the magnetic induction is B501.793-1.840 T. According to the fast heat treatment method, the non-oriented silicon steel produced by controlling fast heat treatment and combining with thin-strip casting is simple in technology, easy to realize, controlled in structure and structural component and high in annealing efficiency, and a product is obviously enhanced in magnetic property.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a rapid heat treatment method for controlling the magnetic properties of twin-roll strip continuous casting non-oriented silicon steel. Background technique [0002] Non-oriented silicon steel, also known as non-oriented electrical steel, is a Si-Fe alloy with very low carbon content. The grains in the steel plate / strip are distributed in random orientation. The nominal thickness of the product is 0.35, 0.5mm and 0.65mm. It is mainly used for the manufacture of electric motors and generators. The magnetic properties of silicon steel sheets 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. Loss value and increase the magnetic induction intensity are the goals that the non-oriented silicon steel manufacturing industry has been pursuing. [0003] In t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C22C38/06
Inventor 许云波张元祥方烽王洋卢翔焦海涛曹光明李成刚刘振宇王国栋
Owner NORTHEASTERN UNIV LIAONING
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