Continuous casting crystallizer casting powder for high-grade silicon steel as well as preparation method and application of continuous casting crystallizer casting powder

A continuous casting mold and mold slag technology, applied in the field of metallurgy, can solve the problem of inability to effectively suppress the dents and cracks on the surface of the billet, and reduce the incidence of dents and cracks on the surface of the billet, and the slag consumption increases and decreases. The effect of breakout risk

Active Publication Date: 2022-02-08
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the existing continuous casting mold mold powder cannot effectively suppress the phenomenon of depression and cracks on the surface of high-grade silicon steel during continuous casting, and further provide a continuous casting mold mold powder for high-grade silicon steel And its preparation method and application

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  • Continuous casting crystallizer casting powder for high-grade silicon steel as well as preparation method and application of continuous casting crystallizer casting powder

Examples

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Effect test

Embodiment 1

[0035] This embodiment provides a continuous casting mold powder for high-grade silicon steel, which is composed of the following chemical components in mass percentage: SiO 2 : 40%, CaO: 20%, MgO: 2.5%, Al 2 o 3 : 3%, Na 2 O: 16%, F: 13.0%, C: 3%, and the rest are unavoidable impurities;

[0036] The binary basicity of the mold flux CaO / SiO 2 0.5, the melting point is 950°C, and the viscosity at 1300°C is 0.25Pa·s.

[0037] The preparation method of described mold powder comprises the following steps:

[0038] S1: Weigh calcium silicate refining slag, calcium aluminate refining slag, limestone, bauxite, sodium fluoride, magnesia, quartz sand, fluorite according to the above formula ratio, put them into the mixer and mix them thoroughly. Obtain the mixture, then put the mixture into the melting furnace for pre-melting, the pre-melting temperature is 1450°C, and the holding time is 1.0h, to obtain the pre-melted mixture;

[0039] S2: Cool down the pre-melted mixture to ro...

Embodiment 2

[0043] This embodiment provides a continuous casting mold powder for high-grade silicon steel, which is composed of the following chemical components in mass percentage: SiO 2 : 42%, CaO: 23%, MgO: 1.8%, Al 2 o 3 : 2%, Na 2 O: 14%, F: 12.0%, C: 2%, and the rest are unavoidable impurities;

[0044] The binary basicity of the mold flux CaO / SiO 2 It is 0.55, the melting point is 970°C, and the viscosity at 1300°C is 0.3Pa·s.

[0045] The preparation method of described mold powder comprises the following steps:

[0046] S1: Weigh calcium silicate refining slag, calcium aluminate refining slag, limestone, bauxite, sodium fluoride, magnesia, quartz sand, fluorite according to the above formula ratio, put them into the mixer and mix them thoroughly. Obtain the mixture, then put the mixture into the melting furnace for pre-melting, the pre-melting temperature is 1500°C, and the holding time is 1.5h, to obtain the pre-melted mixture;

[0047] S2: Cool down the pre-melted mixture...

Embodiment 3

[0051] This embodiment provides a continuous casting mold powder for high-grade silicon steel, which is composed of the following chemical components in mass percentage: SiO 2 : 45%, CaO: 27%, MgO: 1.0%, Al 2 o 3 : 1%, Na 2 O: 12%, F: 11.0%, C: 1%, and the rest are unavoidable impurities;

[0052] The binary basicity of the mold flux CaO / SiO 2 It is 0.60, the melting point is 1000°C, and the viscosity at 1300°C is 0.35Pa·s.

[0053] The preparation method of described mold powder comprises the following steps:

[0054] S1: Weigh calcium silicate refining slag, calcium aluminate refining slag, limestone, bauxite, sodium fluoride, magnesia, quartz sand, fluorite according to the above formula ratio, put them into the mixer and mix them thoroughly. Obtain the mixture, and then put the mixture into the melting furnace for pre-melting, the pre-melting temperature is 1500°C, and the holding time is 2.0h, to obtain the pre-melted mixture;

[0055] S2: Cool down the pre-melted m...

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Abstract

The invention relates to the technical field of metallurgy, in particular to continuous casting crystallizer casting powder for high-grade silicon steel as well as a preparation method and application of the continuous casting crystallizer casting powder. The continuous casting crystallizer casting powder provided by the invention comprises the following chemical components in percentage by mass: 40 to 45 percent of SiO2, 20 to 27 percent of CaO, 1.0 to 2.5 percent of MgO, 1 to 3 percent of Al2O3, 12 to 16 percent of Na2O, 10 to 13 percent of F, 1 to 3 percent of C and the balance of inevitable impurities. The binary alkalinity CaO / SiO2 of the casting powder ranges from 0.5 to 0.6, the melting point of the casting powder ranges from 950 DEG C to 1000 DEG C, and the viscosity of the casting powder at the temperature of 1300 DEG C ranges from 0.25 Pa.s to 0.35 Pa.s. According to the continuous casting crystallizer casting powder provided by the invention, through the low-alkalinity, low-melting-point and low-viscosity casting powder, the phenomenon that the surface of a casting blank is easy to sink and crack during continuous casting of a high-grade silicon steel material can be effectively inhibited.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a mold powder for continuous casting molds for high-grade silicon steel and its preparation method and application. Background technique [0002] High-grade silicon steel has the advantages of low iron loss and high energy efficiency, and is widely used in household appliances, automobiles, power generation, motors and other fields. In recent years, with the improvement of motor energy efficiency and the development of new energy vehicles, the market demand for high-grade non-oriented silicon steel has increased significantly, and higher requirements have been placed on the performance of silicon steel, such as lower iron loss, thinner specifications, and higher magnetic induction. Wait. This requires the development of silicon steel products with higher Si and Al content, and the increase of Si and Al content puts forward higher requirements for the mold powder of the contin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111C22C38/02C22C38/04C22C38/06
CPCB22D11/111C22C38/004C22C38/02C22C38/04C22C38/06C22C38/008Y02P10/20
Inventor 麻晗李强岳重祥
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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