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Continuous casting crystallizer casting powder as well as preparation method and application thereof

A continuous casting crystallizer and mold slag technology, which is applied in the field of metallurgy to achieve the effects of reducing heat dissipation, reducing the thermal stress of the slab, and uniform growth

Pending Publication Date: 2021-12-17
ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD +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 slag cannot effectively suppress the phenomenon of depression and cracks on the surface of the low-carbon high-chromium corrosion-resistant steel material during continuous casting, and to provide a continuous casting mold protection Slag and its preparation method and application

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  • Continuous casting crystallizer casting powder as well as preparation method and application thereof

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Embodiment 1

[0033] This embodiment provides a continuous casting mold powder, which is composed of the following chemical components in mass percentage: SiO 2 : 40%, CaO: 38%, MgO: 1.5%, Al 2 o 3 : 6%, Na 2 O: 5%, F: 5%, C: 3%, and the rest are unavoidable impurities;

[0034] The binary basicity of the mold flux CaO / SiO 2 It is 0.95, the melting point is 1120°C, and the viscosity at 1300°C is 2.5Pa·s.

[0035] The preparation method of described mold powder comprises the following steps:

[0036]S1: Weigh calcium silicate refining slag, calcium aluminate refining slag, limestone, bauxite, sodium fluoride, magnesia, quartz sand, fluorite, and graphite according to the above formula ratio, and put them into the mixer to fully Mixing, the mixing time is 10min, the rotating speed of the mixer is 40r / min, and the mixed dry material is obtained, and then starch binder with a mass of 2% of the mixed dry material is added, stirred and mixed, and the mixed raw material is obtained;

[0037]...

Embodiment 2

[0040] This embodiment provides a continuous casting mold powder, which is composed of the following chemical components in mass percentage: SiO 2 : 35%, CaO: 35%, MgO: 2.2%, Al 2 o 3 : 5%, Na 2 O: 8%, F: 8%, C: 5%, and the rest are unavoidable impurities;

[0041] The binary basicity of the mold flux CaO / SiO 2 1.00, the melting point is 1140°C, and the viscosity at 1300°C is 2.0 Pa·s.

[0042] The preparation method of described mold powder comprises the following steps:

[0043] S1: Weigh calcium silicate refining slag, calcium aluminate refining slag, limestone, bauxite, sodium fluoride, magnesia, quartz sand, fluorite, graphite according to the above formula ratio, and then put them into the mixer Fully mix, the mixing time is 12min, and the speed of the mixer is 32 rpm to obtain a mixed dry material, then add a dextrin binder with a mass of 2.5% of the mixed dry material, stir and mix, and obtain a mixed raw material;

[0044] S2: add water to the mixed raw material...

Embodiment 3

[0047] This embodiment provides a continuous casting mold powder, which is composed of the following chemical components in mass percentage: SiO 2 : 38%, CaO: 40%, MgO: 1.8%, Al 2 o 3 : 4%, Na 2 O: 6%, F: 6%, C: 4%, and the rest are unavoidable impurities;

[0048] The binary basicity of the mold flux CaO / SiO 2 It is 1.05, the melting point is 1160°C, and the viscosity at 1300°C is 1.5Pa·s.

[0049] The preparation method of described mold powder comprises the following steps:

[0050] S1: Weigh calcium silicate refining slag, calcium aluminate refining slag, limestone, bauxite, sodium fluoride, magnesia, quartz sand, fluorite, graphite according to the above formula ratio, and then put them into the mixer Fully mix, the mixing time is 15 minutes, and the speed of the mixer is 25 rpm to obtain a mixed dry material, then add a carboxymethyl cellulose binder with a mass of 3.0% of the mixed dry material, stir and mix, and obtain a mixed raw material;

[0051] S2: Add water...

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Abstract

The invention relates to the technical field of metallurgy, in particular to continuous casting crystallizer casting powder as well as a preparation method and application thereof. The continuous casting crystallizer casting powder provided by the invention comprises the following chemical components in percentage by mass: 35 to 40 percent of SiO2, 35 to 40 percent of CaO, 1.5 to 2.2 percent of MgO, 4 to 6 percent of Al2O3, 5 to 8 percent of Na2O, 5 to 8 percent of F, 3 to 5 percent of C and the balance of inevitable impurities, wherein the binary alkalinity CaO / SiO2 of the casting powder ranges from 0.95 to 1.05; the melting point of the casting powder ranges from 1120 DEG C to 1160 DEG C; and the viscosity of the casting powder at the temperature of 1300 DEG C ranges from 1.5 Pa.s to 2.5 Pa.s. According to the continuous casting crystallizer casting powder provided by the invention, the casting powder with high alkalinity, high melting point and high viscosity is matched with specific casting powder components, so that the phenomenon that a low-carbon high-chromium corrosion-resisting steel material is easy to sink and crack on the surface of a casting blank during continuous casting can be effectively inhibited.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a continuous casting mold mold slag and its preparation method and application. Background technique [0002] Low-carbon high-chromium corrosion-resistant steel is a steel material designed and developed for marine environments, which can greatly increase the service life of marine engineering buildings. The material adopts low-carbon and high-chromium components (C≤0.015wt.%, Cr 10wt.%), which have low thermal conductivity and large linear expansion coefficient. During the continuous casting process, the solidification and shrinkage of the billet shell is large, and sags and cracks are prone to occur. and other defects. [0003] The prior art discloses a method for continuous casting of high chromium steel, comprising the following steps: 1) injecting molten steel of L80-3Cr high chromium steel with a degree of superheat of 15-30°C into the mold of the continuous casting mac...

Claims

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Application Information

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IPC IPC(8): B22D11/111C22C38/02C22C38/04C22C38/24C22C38/22
CPCB22D11/111C22C38/02C22C38/04C22C38/24C22C38/22B22D11/001Y02P10/20
Inventor 麻晗李强
Owner ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD
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