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Non-oriented silicon steel and method for producing non-oriented silicon steel by thin slab continuous casting and rolling process

A thin slab continuous casting, oriented silicon steel technology, applied in metal rolling and other directions, can solve the problems of affecting the magnetic properties and surface quality of finished products, prone to corrugated defects, and less continuous casting billets.

Active Publication Date: 2021-11-02
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing thin slab continuous casting and rolling production process of low-grade non-oriented silicon steel is basically mature, but for high-grade non-oriented silicon steel, especially when the silicon content is greater than 2.5%, it is all produced by the traditional thick slab process, because the thin slab The continuous casting and rolling process has the characteristics of fast cooling speed and no electromagnetic stirring. The continuous casting slab has fewer equiaxed crystals. In addition, the hot rolling process does not have the large-pressure broken columnar crystals in the rough rolling pass of the traditional thick slab process. , so the hot-rolled band structure is serious, and corrugated defects are prone to appear, which affects the magnetic properties and surface quality of the finished product. At present, there is no public disclosure of the process of producing high-grade non-oriented silicon steel by the continuous casting and rolling process of thin slabs

Method used

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  • Non-oriented silicon steel and method for producing non-oriented silicon steel by thin slab continuous casting and rolling process
  • Non-oriented silicon steel and method for producing non-oriented silicon steel by thin slab continuous casting and rolling process

Examples

Experimental program
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Embodiment 1

[0056] The thin slab continuous casting and rolling process of the present embodiment produces the method for non-oriented silicon steel, comprising the following steps:

[0057] Step A: smelting;

[0058] In the smelting process of step A, converter smelting is carried out first, and then RH refining treatment is carried out, and the mass percentage of the chemical composition of the end point of the molten steel after treatment is:

[0059] Si: 2.5%, Al: 1.5%, Mn: 1.5%, [S+O+C+N+Ti]: 76ppm, La: 0.005%, the balance is Fe and other impurity elements;

[0060] Add the rare earth element 1 minute after the RH refining and alloying, and stir after adding the rare earth element for 3 minutes;

[0061] Step B: continuous casting;

[0062] In step B, during the continuous casting process, the casting speed is controlled to be 4.6 m / min, and a slab with a thickness of 70 mm is obtained through continuous casting; wherein, the superheat degree of the tundish is controlled to -5°C, a...

Embodiment 2

[0073] The thin slab continuous casting and rolling process of the present embodiment produces the method for non-oriented silicon steel, comprising the following steps:

[0074] Step A: smelting;

[0075] In the smelting process of step A, converter smelting is carried out first, and then RH refining treatment is carried out, and the mass percentage of the chemical composition of the end point of the molten steel after treatment is:

[0076] Si: 3.0%, Al: 1.0%, Mn: 1.0%, [S+O+C+N+Ti]: 70ppm, (La+Ce): 0.008%, the balance is Fe and other impurity elements;

[0077] Add the rare earth element 2 minutes after the end of RH refining and alloying, and stir after adding the rare earth element, and the stirring time is 4 minutes;

[0078] Step B: continuous casting;

[0079] In the continuous casting process of step B, the casting speed is controlled to be 3.5 m / min, and a slab with a thickness of 50 mm is obtained through continuous casting; wherein, the superheating degree of the...

Embodiment 3

[0090] The thin slab continuous casting and rolling process of the present embodiment produces the method for non-oriented silicon steel, comprising the following steps:

[0091] Step A: smelting;

[0092] In the smelting process of step A, converter smelting is carried out first, and then RH refining treatment is carried out, and the mass percentage of the chemical composition of the end point of the molten steel after treatment is:

[0093] Si: 3.5%, Al: 0.10%, Mn: 0.10%, [S+O+C+N+Ti]: 67ppm, rare earth element (La+Ce+Nd): 0.01%, the balance is Fe and other impurity elements ;

[0094] Add the rare earth element 2 minutes after the end of RH refining and alloying, and stir after adding the rare earth element, and the stirring time is 4 minutes;

[0095] Step B: continuous casting;

[0096] In the continuous casting process of step B, the casting speed is controlled to be 2.8 m / min, and a slab with a thickness of 30 mm is obtained through continuous casting; wherein, the s...

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Abstract

The invention discloses a non-oriented silicon steel and a thin slab continuous casting and rolling process to produce the non-oriented silicon steel, and relates to the non-oriented silicon steel and a production method thereof. The invention comprises the following steps: step A: smelting; step B: continuous casting; step C: heating; step D: hot continuous rolling; step E: pickling; step F: cold rolling; and step G: recrystallization annealing. The invention utilizes the thin slab continuous casting and rolling process to produce qualified high-grade non-oriented silicon steel.

Description

technical field [0001] The present invention relates to non-oriented silicon steel and a production method thereof, more specifically, relates to a non-oriented silicon steel and a method for producing high-grade, high-efficiency non-oriented silicon steel through the non-normalized process of continuous casting and rolling of thin slabs. Background technique [0002] Currently disclosed thin slab continuous casting and rolling processes for producing non-oriented silicon steel, such as patent publication number: CN102134675 A, patent publication number: CN 101906577 A and patent publication number: CN 103088253 A and other patent applications, are basically low-grade Or medium-grade non-oriented silicon steel production methods. [0003] The existing thin slab continuous casting and rolling production process of low-grade non-oriented silicon steel is basically mature, but for high-grade non-oriented silicon steel, especially when the silicon content is greater than 2.5%, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C22C38/02C22C38/04C21D8/12B21B1/46
CPCB21B1/463C21D8/1211C22C38/005C22C38/02C22C38/04C22C38/06
Inventor 樊立峰秦美美岳尔斌朱蓉郭锋何建中陆斌张文博乔继强华国龙黄娇
Owner INNER MONGOLIA UNIV OF TECH
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