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High-grade non-oriented electrical steel and preparation method thereof

A technology of grain-oriented electrical steel and high grade, applied in the field of electrical steel, which can solve the problems of high iron loss and low magnetic induction of electrical steel

Active Publication Date: 2022-05-27
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention lies in the problem of low magnetic induction and high iron loss of existing electrical steel, so as to provide a high-grade non-oriented electrical steel and its Preparation

Method used

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  • High-grade non-oriented electrical steel and preparation method thereof
  • High-grade non-oriented electrical steel and preparation method thereof
  • High-grade non-oriented electrical steel and preparation method thereof

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Embodiment

[0063] The present embodiment provides a kind of preparation method of high-grade non-oriented electrical steel, and its concrete steps are as follows:

[0064] 1) Carry out hot metal pretreatment, including desulfurization and slag removal: it is required that the molten iron S≤0.030% and Ti≤0.050% before desulfurization, the slag removal after desulfurization is clean, and the molten iron after desulfurization is controlled to S≤0.0015%;

[0065] 2) Carry out converter smelting: it is required to add low-sulfur (S≤0.010%) scrap steel, and use low-sulfur (S≤0.020%) steelmaking auxiliary materials, and control the end point of the converter to be C: 0.020~0.040%, S≤0.0030%, P≤ 0.018%, [O]≤750ppm, control ladle slag thickness≤60mm when tapping;

[0066] 3) Deoxidize and alloy the molten steel after smelting, and then perform secondary desulfurization, and finally make C≤0.0030wt%, S≤0.0015wt%, Ti≤0.0020wt% in the molten steel, and the vacuum degree is required to be less than 2...

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Abstract

The invention discloses high-grade non-oriented electrical steel which comprises the following elements in percentage by mass: less than or equal to 0.0030% of C, 2.80-3.05% of Si, 0.20-0.30% of Mn, less than or equal to 0.020% of P, less than or equal to 0.0015% of S, 0.50-0.65% of Al, less than or equal to 0.0030% of N, 0.041-0.064% of Sn, less than or equal to 0.05% of Cr, less than or equal to 0.03% of Cu, less than or equal to 0.002% of V, less than or equal to 0.002% of Ti, less than or equal to 0.002% of Nb, less than or equal to 0.002% of Mo and the balance of Fe and inevitable impurities. The invention further discloses a preparation method of the electrical steel. The chemical components of the electrical steel are precisely controlled, the process is optimized, the high-grade non-oriented electrical steel with excellent performance is obtained, the iron loss P1.5 / 50 of the electrical steel is smaller than or equal to 2.70 W / kg, the magnetic induction B5000 of the electrical steel is larger than or equal to 1.69 T, and the performance requirements of large and medium-sized motor iron cores are met.

Description

technical field [0001] The invention relates to the field of electrical steel, in particular to a high-grade non-oriented electrical steel and a preparation method thereof. Background technique [0002] High-grade non-oriented electrical steel is mainly used for large and medium-sized generators, inverter compressors and electric vehicle drive motors. Its silicon content is generally in the range of 2.0% to 3.5%, and the thickness is mainly 0.35mm and 0.50mm. [0003] Generally, in order to achieve low iron loss of electrical steel sheets, elements such as silicon, aluminum, manganese, and phosphorus are added to increase the resistivity and reduce the eddy current loss, which also reduces the magnetic flux density and leads to an increase in hardness. Therefore, in large-scale industrial production, the electromagnetic performance is usually improved by improving the cleanliness of steel. On the one hand, it can reduce the inclusion of the second phase, which is not condu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/12C21D1/26C21D1/74C21C1/02C21C7/06C21C7/064C21C7/10C22C33/04
CPCC22C38/02C22C38/004C22C38/04C22C38/06C22C38/008C21D8/1222C21D8/1233C21D8/1272C21D1/26C21D1/74C21C1/02C21C7/06C21C7/064C21C7/10C22C33/04Y02T10/64Y02P10/20
Inventor 詹东方岳重祥
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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