Crystallizer casting powder applied to high-speed continuous casting

A mold powder and mold powder technology, applied in the field of metallurgy, can solve the problems of surface defect cohesion, breakout, and continuous casting mold powder consumption reduction, etc.

Active Publication Date: 2021-07-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] As the pouring speed increases, the relative consumption of continuous casting mold slag decreases, resulting in insufficient lubrication between the mold wall and the solidified slab shell, uneven heat transfer, and prone to surface defects and cohesive breakouts of the slab and other accidents, the present invention provides a mold flux for high-speed continuous casting, which optimizes the composition and innovatively adds an exothermic agent with an amount of 0.5-1.5%.

Method used

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  • Crystallizer casting powder applied to high-speed continuous casting
  • Crystallizer casting powder applied to high-speed continuous casting

Examples

Experimental program
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Embodiment 1

[0062] The exothermic agent used in Example 1 is composed of calcium carbide and silicon-calcium alloy (Ca: 40wt%, Si: 60wt%) in a mass ratio of 1:1.

Embodiment 2

[0063] The exothermic agent used in Example 2 was composed of silicon-calcium alloy (Ca: 40 wt%, Si: 60 wt%).

Embodiment 3

[0064] The exothermic agent used in Example 3 was composed of silicon-calcium alloy (Ca: 45 wt%, Si: 55 wt%).

[0065] It can be seen from Table 1 that the melting temperatures of Examples 1 to 3 are 1002°C, 981°C, and 970°C respectively; the viscosities at 1300°C are 0.142Pa·s, 0.123Pa·s, and 0.118Pa·s; the heat fluxes are 3.9MW respectively m -2 , 4.1MW·m -2 , 4.6MW·m -2 .

[0066] It can be seen from Table 1 that the melting temperatures of Comparative Examples 1 to 3 are 1016°C, 996°C, and 983°C respectively; the viscosities at 1300°C are 0.154Pa·s, 0.136Pa·s, and 0.122Pa·s; the heat fluxes are 3.1MW respectively m -2 、3.3MW·m -2 , 3.6MW·m -2 .

[0067] Comparing Examples 1 to 3 and Comparative Examples 1 to 3, it can be found that: the high casting speed mold flux added with exothermic agent has lower viscosity and melting temperature than the high casting flux without exothermic agent, and faster Melting speed, at the same time has a good lubricating ability, for...

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Abstract

The invention discloses crystallizer casting powder applied to high-speed continuous casting. The casting powder comprises basic powder and a heating agent before the casting powder is added into a crystallizer; the heating agent contains at least one of zero-valent silicon, zero-valent calcium, silicon-calcium alloys, silicon carbide, calcium carbide and calcium silicon carbide; the basic powder comprises CaO, SiO2, Al2O3, B2O3, MgO, Na2O, CaF2 and C; after the casting powder is added into the crystallizer, the casting powder is reacted to form final casting powder with binary alkalinity (CaO / SiO2) of 0.6-1.0. The casting powder has low viscosity and melting temperature, is high in melting speed, and is capable of forming a stable liquid layer, lubricating casting blanks, controlling heat transfer, absorbing inclusions in steel without performance deterioration, and ensuring smooth proceeding of the continuous casting process.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to auxiliary materials used in continuous casting processes, and more particularly relates to mold mold flux for high-speed continuous casting. Background technique [0002] Continuous casting mold slag is a kind of auxiliary functional material for steelmaking covering the surface of molten steel in the mold of continuous casting machine. The process controls the last process element of the surface quality of the slab. At this stage, due to the continuous improvement of steelmaking technology, the accelerated pace of steelmaking, and the increase in the amount of steel tapping from the furnace, compared with the capacity of steelmaking and steel rolling processes, the production capacity of existing continuous casting machines is likely to become a restrictive link for the entire steelmaking plant. High-efficiency continuous casting has become an important symbol of...

Claims

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Application Information

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IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 周乐君王万林王子超吴厚发罗豪颜雄田研孙群保刘合萍高旭张同生曾杰周游窦坤
Owner CENT SOUTH UNIV
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