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Molding slag for continuous casting of high-alumina steel and its preparation method and application

A technology of mold slag and high-aluminum steel, which is applied in the field of metallurgy, can solve the problems of changing the composition and performance of mold slag, deterioration of the lubrication performance of the mold slag, and personal hazards, achieving good lubrication effect, reducing sags, and reducing fluorine pollution.

Inactive Publication Date: 2020-12-29
HUNAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is the following reaction at the mold slag-liquid steel interface: 4[Al]+3(SiO 2 )=2(Al 2 o 3 )+3[Si], will seriously change the composition and performance of the mold flux, making the mold flux Al 2 o 3 The substantial increase of the content will lead to the deterioration of the mold slag lubricating performance, and finally cause continuous casting difficulties, causing problems such as sticking and breakout
In order to reduce the viscosity and improve the lubricating effect, a large amount of fluoride such as CaF is often added to the existing mold flux 2 , causing environmental pollution, personal injury and equipment corrosion

Method used

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  • Molding slag for continuous casting of high-alumina steel and its preparation method and application
  • Molding slag for continuous casting of high-alumina steel and its preparation method and application

Examples

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Embodiment 1

[0036] This example provides a method for preparing mold flux for continuous casting of high-aluminum steel. The mass fraction of each raw material of mold flux is as follows: Al 2 o 3 : 40%, MgO: 21%, B 2 o 3 : 10%, CaO: 3%, MnO: 5%, carbonaceous material: 8%, SiO 2 :3%, CaF 2 : 3%, Na 2 O: 3%, Li 2 O: 3%, K 2 O: 1%.

[0037] In this embodiment, the production process of mold flux includes the following steps:

[0038]S1. Take the mixture of each raw material (except carbonaceous material) in proportion, and carry out pre-melting treatment in the melting furnace;

[0039] S2. quenching, pulverizing and drying the pre-melted mixture to make a base material with a particle size of about 0.04mm;

[0040] S3. Add carbonaceous material to the base material and mix evenly;

[0041] S4. Transport the mixture in step S4 to a spray granulation tower for atomization granulation and drying, and the dried granules pass through a 0.1-1mm sieve to obtain mold flux for continuous ...

Embodiment 2

[0043] This example provides a method for preparing mold flux for continuous casting of high-alumina steel. The production process of mold flux is consistent with that of Example 1. The mass fraction of each raw material of mold flux is as follows: Al 2 o 3 : 41%, MgO: 22%, B 2 o 3 : 12%, CaO: 3%, MnO: 4%, carbonaceous material: 5%, SiO 2 :3%, CaF 2 : 3%, Na 2 O: 3%, Li 2 O: 3%, K 2 O: 1%.

Embodiment 3

[0045] This example provides a method for preparing mold flux for continuous casting of high-alumina steel. The production process of mold flux is consistent with that of Example 1. The mass fraction of each raw material of mold flux is as follows: Al 2 o 3 : 45%, MgO: 20%, B 2 o 3 : 10%, CaO: 4%, MnO: 4%, carbonaceous material: 6%, SiO 2 :3%, CaF 2 : 2%, Na 2 O: 2%, Li 2 O: 2%, K 2 O: 2%.

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Abstract

The invention discloses casting powder for high-aluminum steel continuous casting and a preparation method thereof and an application. The casting powder for high-aluminum steel continuous casting adopts A203-MgO-B203 as a slag system, with Al203, MgO, B203 as a main substrate, and adopts CaO, MnO, SiO2, CaF2, Na2O, K2O, Li2O,C as raw materials meanwhile, all the materials are mixed and spray granulated to prepare the casting powder. The casting powder is low in melting point and viscosity and good in lubricating performance, when the casting powder is used for high-aluminum steel production,the degree of slag-steel reaction can be reduced, the surface quality of a casting blank can be improved, defects such as pits and cracks are reduced, and the production qualified rate of the castingblank is improved. According to the method, the consumption of CaF2 in the casting powder is reduced, the influence of continuous casting process on the environment is reduced, meanwhile, the preparation process is simple, and industrial production is easy to implement.

Description

technical field [0001] The invention relates to the technical field of metallurgy, and more specifically, to a mold flux for continuous casting of high-aluminum steel and its preparation method and application. Background technique [0002] Mold slag for steelmaking and continuous casting is a necessary auxiliary material in the current continuous casting process. With the development of high-efficiency continuous casting technology, higher requirements are put forward for mold slag. During the continuous casting process, the mold flux for continuous casting plays the role of heat insulation, lubrication, control of heat transfer, dissolution of non-metallic inclusions in steel, and prevention of oxidation of molten steel by acting on the surface of molten steel in the mold and the shell of the slab. , to ensure the quality of continuous casting slab and the smooth progress of continuous casting production. [0003] High-aluminum steel is a steel grade with an Al content &g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
Inventor 胡洵璞汤伟罗登曾凡政袁工阳阳建君
Owner HUNAN UNIV OF TECH
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