Non-oriented electrical steel for new energy vehicle and manufacture method thereof

A technology for new energy vehicles and grain-oriented electrical steel, which is applied in the field of non-oriented electrical steel for new energy vehicles and its production, can solve the problem that the high magnetic induction requirements of non-oriented silicon steel for new energy vehicles cannot be met, and the loss value of magnets cannot meet the requirements of new energy vehicles. Automobile use requirements, inability to meet the low iron loss requirements of non-oriented silicon steel, etc., to achieve the effect of eliminating surface corrugation defects, reducing high-temperature coiling and normalization processes, and low iron loss

Active Publication Date: 2018-09-07
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent publications such as CN 103882293A, CN 1611616A and CN 1888111A all use various techniques to develop non-oriented electrical steel, but their shortcomings are: (1) most of the finished products have a thickness of 0.5mm, and cold rolling The reduction rates are all greater than 70%, and when the cold rolling reduction rate is further increased, especially greater than 80%, the (111) texture increases rapidly, and the (100) texture is suppressed, which is extremely unfavorable to the magnetic induction and cannot meet the needs of new energy sources. High magnetic induction requirements for non-oriented silicon steel for automobiles; (2) Calcium treatment is used in the technical solutions of some patent applications. Although calcium treatment can modify inclusions, it cannot significantly reduce the number of inclusions; (3) Hot-rolled coils in the hot-rolling process It needs to be coiled at a high temperature

Method used

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  • Non-oriented electrical steel for new energy vehicle and manufacture method thereof
  • Non-oriented electrical steel for new energy vehicle and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0071] Example 1

[0072] The production method of non-oriented electrical steel for new energy vehicles of this embodiment includes the following steps:

[0073] Step A: Smelting;

[0074] In the smelting process of step A, the converter smelting is carried out first, and then the RH refining treatment is carried out. After the treatment, the mass percentage of the chemical composition of the molten steel terminal is:

[0075] Si: 3.0%, Al: 2.0%, Mn: 2.0%, S: 15ppm, O: 20ppm, C: 10ppm, N: 17ppm, Ti: 8ppm, [S+O+C+N+Ti]≤80ppm, [ Sn+Sb]: 0.03%, [La+Ce+Nd]: 0.002%, the balance is Fe and other impurity elements;

[0076] Add rare earth elements 1 minute after the end of RH refining and alloying, and stir after adding rare earth elements for 3.5 minutes;

[0077] Step B: Continuous casting;

[0078] In the continuous casting process of step B, the drawing speed during continuous casting is controlled to be 0.6 m / min, and the continuous casting obtains a slab with a thickness of 220 mm; the co...

Example Embodiment

[0098] Example 2

[0099] The production method of non-oriented electrical steel for new energy vehicles of this embodiment includes the following steps:

[0100] Step A: Smelting;

[0101] In the smelting process of step A, the converter smelting is carried out first, and then the RH refining treatment is carried out. After the treatment, the mass percentage of the chemical composition of the molten steel terminal is:

[0102] Si: 3.5%, Al: 1.5%, Mn: 1.5%, S: 12ppm, O: 15ppm, C: 10ppm, N: 15ppm, Ti: 5ppm, Sn: 0.05%, La: 0.005%, the balance is Fe and Other impurity elements;

[0103] Add rare earth elements 2 minutes after the end of RH refining and alloying, and stir after adding rare earth elements for 3 minutes;

[0104] Step B: Continuous casting;

[0105] In the continuous casting process of step B, the drawing speed during continuous casting is controlled to be 1.0 m / min, and the continuous casting obtains a slab with a thickness of 250 mm; the continuous casting process of step B ...

Example Embodiment

[0125] Example 3

[0126] The production method of non-oriented electrical steel for new energy vehicles of this embodiment includes the following steps:

[0127] Step A: Smelting;

[0128] In the smelting process of step A, the converter smelting is carried out first, and then the RH refining treatment is carried out. After the treatment, the mass percentage of the chemical composition of the molten steel terminal is:

[0129] Si: 4.0%, Al: 1.0%, Mn: 1.0%, S: 18ppm, O: 12ppm, C: 10ppm, N: 15ppm, Ti: 5ppm, Sb: 0.1%, [La+Ce]: 0.1%, remainder The amount is Fe and other impurity elements;

[0130] Add rare earth elements 2 minutes after the end of RH refining and alloying, and stir after adding rare earth elements for 4 minutes;

[0131] Step B: Continuous casting;

[0132] In the continuous casting process of step B, the drawing speed during continuous casting is controlled to be 2.0 m / min, and the continuous casting obtains a slab with a thickness of 300 mm; the continuous casting process...

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Abstract

The invention discloses non-oriented electrical steel for a new energy vehicle and a manufacture method thereof, and relates to non-oriented electrical steel and the production method thereof. The production method comprises the following steps: step A, smelting; step B, continuous casting; step C, heating; step D, phosphorus removal; step E, rough rolling; step F, feeding into a hot rolling box to process; step G, finish rolling; step H, rolling; step I, primary cold-rolling; step J, intermediate annealing; step K, secondary cold-rolling; and step L, final annealing. The non-oriented electrical steel aims to overcome the defects that an existing production process has difficulty in meeting using requirements of the non-oriented electrical steel for the new energy vehicle, provides the non-oriented electrical steel for the new energy vehicle and the production method thereof which can produce the ultrathin non-oriented electrical steel for the new energy vehicle, and the ultrathin non-oriented electrical steel is low in iron loss under high frequency, and is good in high magnetic induction and surface quality.

Description

technical field [0001] The invention relates to a non-oriented electrical steel and a production method thereof, more specifically, to a non-oriented electrical steel for new energy vehicles and a production method thereof. Background technique [0002] Non-oriented electrical steel is a silicon-iron soft magnetic alloy with very low carbon content, and it is an indispensable and important material in electric power, electronics and military industries. Non-oriented electrical steel is the iron core material of the motor and generator rotor working in the rotating magnetic field, and requires good magnetic properties and process properties. In recent years, with the development of high-speed and miniaturized motors for new energy vehicles, higher requirements have been placed on the performance of non-oriented electrical steels, such as low iron loss and high magnetic induction at high frequencies. [0003] New energy vehicles—electric (EV) / hybrid electric vehicles (HEV) ha...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/60C21D8/12C22C33/04
CPCC21D8/1222C21D8/1233C21D8/1272C22C33/04C22C38/005C22C38/008C22C38/02C22C38/04C22C38/06C22C38/12C22C38/60
Inventor 樊立峰朱蓉郭锋何建中陆斌华国龙乔继强张文博董瑞峰
Owner INNER MONGOLIA UNIV OF TECH
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