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Method for producing non-oriented electrical steel with high magnetic induction and low iron loss by CSP process

A technology of grain-oriented electrical steel and high magnetic induction, which is applied in the field of CSP process to produce non-oriented electrical steel with high magnetic induction and low iron loss, can solve the problems of unqualified magnetic properties, reduce the generation of texture and improve the magnetic induction. Effect

Active Publication Date: 2018-08-17
INNER MONGOLIA UNIV OF TECH
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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 disadvantages of unqualified magnetic properties due to excessive cold rolling reduction in the process of producing non-oriented electrical steel by the existing CSP process, and provide a non-oriented electrical steel with high magnetic induction and low iron loss produced by the CSP process The method makes the non-oriented electrical steel produced have excellent magnetic properties with high magnetic induction and low iron loss under the premise that the total reduction ratio of cold rolling is much greater than 85%.

Method used

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  • Method for producing non-oriented electrical steel with high magnetic induction and low iron loss by CSP process
  • Method for producing non-oriented electrical steel with high magnetic induction and low iron loss by CSP process

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Embodiment 1

[0060] The method for producing non-oriented electrical steel with high magnetic induction and low iron loss by the CSP process of this embodiment comprises the following steps:

[0061] Step A: smelting;

[0062] 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:

[0063] Si: 0.1%, Al: 1.5%, Mn: 1.5%, [S+O+C+N+Ti]≤76PPM, the balance is Fe and other impurity elements;

[0064] Step B: continuous casting;

[0065] In the continuous casting process of step B, the casting speed is controlled to be 4.0 m / min during continuous casting, and a slab with a thickness of 55 mm is obtained through continuous casting; wherein, the superheating degree of the tundish is controlled to -2°C, and the equiaxed crystal ratio is 95%;

[0066] Step C: heating;

[0067] In the heating process of step C, the casting bi...

Embodiment 2

[0080] The method for producing non-oriented electrical steel with high magnetic induction and low iron loss by the CSP process of this embodiment comprises the following steps:

[0081] Step A: smelting;

[0082] 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:

[0083] Si: 1.5%, Al: 1.0%, Mn: 1.0%, [S+O+C+N+Ti]≤75PPM, the balance is Fe and other impurity elements;

[0084] Step B: continuous casting;

[0085] In the continuous casting process of step B, the casting speed is controlled to be 3.3 m / min during continuous casting, and a slab with a thickness of 60 mm is obtained through continuous casting; wherein, the superheating degree of the tundish is controlled to -4°C, and the equiaxed crystal ratio is guaranteed to be 85%;

[0086] Step C: heating;

[0087] During the heating process of s...

Embodiment 3

[0100] The method for producing non-oriented electrical steel with high magnetic induction and low iron loss by the CSP process of this embodiment comprises the following steps:

[0101] Step A: smelting;

[0102] 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:

[0103] Si: 3.0%, Al: 0.10%, Mn: 0.10%, [S+O+C+N+Ti]≤75PPM, the balance is Fe and other impurity elements;

[0104] Step B: continuous casting;

[0105] In the continuous casting process of step B, the casting speed is controlled to be 2.8 m / min during continuous casting, and a slab with a thickness of 70 mm is obtained through continuous casting; wherein, the superheating degree of the tundish is controlled at -5°C, and the equiaxed crystal ratio is 80%;

[0106] Step C: heating;

[0107] During the heating process of step C, the cast...

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Abstract

The invention discloses a method for producing non-oriented electrical steel with high magnetic induction and low iron loss by a CSP process, and relates to a production method of non-oriented electrical steel. The method comprises the following steps that step A, smelting is carried out; step B, continuous casting is carried out; step C, heating is carried out; step D, hot continuous rolling is carried out; step E, pickling is carried out; step F, one-time cold rolling is carried out; step G, annealing is carried out; step H, secondary cold rolling is carried out; and step I, recrystallization and annealing are carried out. The purpose of the method is to overcome the defect of unqualified magnetic properties caused by too large cold rolling reduction rate in the process of producing non-oriented electrical steel by an existing CSP process, and the produced non-oriented electrical steel has excellent magnetic properties of high magnetic induction and low iron loss under the premise that the total pressure reduction rate of cold rolling is far greater than 85%.

Description

technical field [0001] The invention relates to a production method of non-oriented electrical steel, more specifically, a method for producing non-oriented electrical steel with high magnetic induction and low iron loss through a CSP process. Background technique [0002] The production process of traditional non-oriented electrical steel generally adopts hot charging and hot delivery. Three heating furnaces correspond to one rolling line. Great flexibility with little to no transition material. [0003] Compared with the traditional process, the non-oriented electrical steel produced by the CSP process has the advantages of high yield and uniform magnetic properties. However, when the CSP process produces non-oriented electrical steel, once there is a problem in the rolling mill or coiling, non-oriented electrical steel can only be used for transition, so that ultra-thick hot-rolled sheets will be produced; and once the total reduction ratio of cold rolling exceeds 90 %,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/12
CPCC21D8/1222C21D8/1233C21D8/1266C21D8/1272C22C38/02C22C38/04C22C38/06
Inventor 樊立峰朱蓉郭锋何建中陆斌张文博乔继强华国龙
Owner INNER MONGOLIA UNIV OF TECH
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