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High-manganese low-temperature steel continuous casting crystallizer casting powder

A continuous casting mold and mold slag technology is applied in the field of iron and steel smelting and continuous casting, and can solve the problems of inability to meet the weak cooling requirements for initial solidification of high-manganese and low-temperature steel, inability to meet lubrication and heat transfer properties, and reducing the interface reaction of steel slag. Weak reactivity of steel slag interface, fine grain size, and the effect of promoting heat transfer

Active Publication Date: 2022-02-18
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Less than 2% SiO 2 The interface reaction of steel slag is greatly reduced, and the change of mold slag composition and performance deterioration due to steel slag reaction are avoided. However, the mold slag has strong crystallinity, low slag consumption, and the lubrication and heat transfer properties cannot meet the continuous casting requirements of high manganese and low temperature steel.
Patent CN107470576A discloses a Fe-containing 2 o 3 Mold powder for high manganese and high aluminum steel, through Fe 2 o 3 Connected silicate network structure fixed part of SiO 2 , inhibit the steel slag interface reaction, but SiO 2 If the content is not less than 11%, the steel slag interface reaction will still occur, which will deteriorate the performance of the mold slag, and cannot meet the weak cooling requirements for the initial solidification of high manganese low temperature steel
Currently, CaO-Al 2 o 3 Mold slag is used for continuous casting of high manganese low temperature steel ([Mn]=20-26%, [Al]=1-2%, [Cr]=2-3%), which is prone to problems such as mold breakout

Method used

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  • High-manganese low-temperature steel continuous casting crystallizer casting powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In terms of mass percentage, it includes the following components:

[0031] CaO 35.88%, Al 2 o 3 23.92%, SiO 2 3.68%, MgO 5.52%, BaO 3%, B 2 o 3 8.28%, Na 2 O 9.2%, Li 2 O 2%, F - 5.52%, MnO 3%.

[0032] CaO / Al 2 o 3 The mass ratio is 1.5; (CaO+BaO+MgO) / (SiO 2 +Al 2 o 3 +B 2 o 3 ) The mass ratio is 1.24; CaO / B 2 o 3 The mass ratio is 4.33.

[0033] Preparation process: Weigh the above-mentioned mold powder raw materials according to the target components, and perform mechanical stirring to fully mix the components. Then, the mixed sample was heated to 1400°C and melted in a silicon-molybdenum rod resistance furnace to remove volatile matter and gaseous substances. After melting, it was stirred evenly and kept warm for 30 minutes. A complex molten solid solution was formed between the components. The molten solid solution is poured into water and quenched to obtain a glassy mold slag block, and the mold slag block is dried and then mechanically crus...

Embodiment 2

[0035] In terms of mass percentage, it includes the following components:

[0036] CaO 34.71%, Al 2 o 3 23.14%, SiO 2 3.56%, MgO 5.34%, BaO 6%, B 2 o 3 8.01%, Na 2 O 8.9%, Li 2 O 2%, F - 5.34%, MnO 3%.

[0037] CaO / Al 2 o 3 The mass ratio is 1.5; (CaO+BaO+MgO) / (SiO 2 +Al 2 o 3 +B 2 o 3 ) The mass ratio is 1.33; CaO / B 2 o 3 The mass ratio is 4.33.

[0038] The preparation process is the same as in Example 1.

Embodiment 3

[0040] In terms of mass percentage, it includes the following components:

[0041] CaO 33.54%, Al 2 o 3 22.36%, SiO 2 3.44%, MgO 5.16%, BaO 9%, B 2 o 3 7.74%, Na 2 O 8.6%, Li 2 O 2%, F - 5.16%, MnO 3%.

[0042] CaO / Al 2 o 3 The mass ratio is 1.5; (CaO+BaO+MgO) / (SiO 2 +Al 2 o 3 +B 2 o 3 ) The mass ratio is 1.42; CaO / B 2 o 3 The mass ratio is 4.33.

[0043] The preparation process is the same as in Example 1.

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Abstract

The invention discloses high-manganese low-temperature steel continuous casting crystallizer casting powder, and belongs to the technical field of steel smelting continuous casting. The invention discloses a high-temperature-resistant ceramic which comprises the following components in percentage by mass: 25 to 45 percent of CaO, 20 to 35 percent of Al2O3, 2 to 6 percent of SiO2, 0 to 10 percent of BaO, 3 to 10 percent of MgO, 1 to 9 percent of MnO, 2 to 12 percent of Na2O, 0 to 3 percent of Li2O, 3 to 10 percent of B2O3 and 2 to 12 percent of F-. The casting powder has the characteristics of low viscosity, low melting temperature, weak steel slag interface reactivity, strong MnO and Cr2O3 inclusion absorption capability and the like.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting and continuous casting, and in particular relates to mold slag for continuous casting of high manganese and low temperature steel. Background technique [0002] As the country attaches great importance to environmental protection, natural gas, as the most important clean energy, has attracted more and more attention. The consumption of liquefied natural gas (LNG) in my country has been increasing year by year. Large demand for tank steel. Traditional LNG storage materials include Invar alloy, 9Ni steel and austenitic stainless steel. In recent years, in order to reduce the dependence on high-priced nickel elements and reduce production costs, high-manganese steel for ultra-low temperature has attracted much attention because of its low price and excellent ductility and toughness. Due to the alloy content of high manganese steel for ultra-low temperature is as high as 30%, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111Y02P10/20
Inventor 程常桂刘亮李阳吴卫利崔银解晓晨秦绪锋金焱
Owner WUHAN UNIV OF SCI & TECH