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Continuous casting mold powder for ferrite stainless steel and preparation method thereof

A technology for continuous casting mold flux and stainless steel, which is applied in the field of continuous casting mold flux for ferritic stainless steel and its preparation, can solve the problems of agglomeration, mold formation and difficulty in continuous casting, and achieves simple process and low melting temperature. , the effect of suitable crystallization performance

Inactive Publication Date: 2011-06-01
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Ferritic stainless steel generally contains relatively high Ti and Cr, which makes it easy to generate high melting point compounds in the crystallizer. So far, ferritic stainless steel, especially ferritic stainless steel containing titanium, has not been able to fully realize multi-furnace continuous production. There are three major technical problems in the continuous casting production of pouring: one is the crystallizer "fish formation" (refers to agglomeration, crust or cold skin); Steel surface quality problems

Method used

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  • Continuous casting mold powder for ferrite stainless steel and preparation method thereof

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Effect test

Embodiment 1

[0024] Embodiment 1 The carbonaceous material, wollastonite, power plant ash, limestone, soda ash and cryolite are pulverized to 0.1~1mm and mixed uniformly, the mixing ratio is carbonaceous material 2%, wollastonite 60%, power plant ash 20%, limestone 2%, soda ash 10%, cryolite 6%, make mixed material, then add lithium hydroxide, obtain lithium doped material, the addition of lithium hydroxide accounts for 2.5% of mixed material; The raw material is carbon black; add water to the lithium-doped material and stir to form a slurry, wherein water accounts for 15% of the total weight of the slurry; dry the slurry at 500°C for 1 hour to make powdered iron The continuous casting mold flux for ferritic stainless steel has a particle size of 0.5-1.5mm; the chemical composition of continuous casting mold flux for ferritic stainless steel is CaO20%, SiO 2 50%, Al 2 o 3 5%, MgO5%, Na 2 O15%, CaF 2 2%, Li 2 O1%, C2%; the basicity is 0.4; the above continuous casting mold slag is used...

Embodiment 2

[0026] Crush the carbonaceous material, wollastonite, power plant ash, limestone, soda ash and cryolite to 0.1~1mm and mix them evenly. The mixing ratio is 6% by weight of carbonaceous material, 29% wollastonite, and 25% power plant ash. Limestone 15%, soda ash 20%, cryolite 5%, make mixed material, then add lithium hydroxide, obtain lithium doping material, the addition of lithium hydroxide accounts for 3% of mixed material; Described carbonaceous material is graphite;

[0027] Adding water to the lithium-doped material and stirring to form a slurry, wherein water accounts for 20% of the total weight of the slurry;

[0028] Dry the slurry at 400°C for 2 hours to make powdered ferritic stainless steel continuous casting mold flux with a particle size of 0.5~1.5mm;

[0029] The chemical composition of continuous casting mold flux for ferritic stainless steel is CaO30% by weight, SiO 2 45%, Al 2 o 3 10%, MgO1%, Na 2 O1%, CaF 2 10%, Li 2 O5%, C8%; alkalinity is 0.67;

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Embodiment 3

[0032] Crush the carbonaceous material, wollastonite, power plant ash, limestone, soda ash and cryolite to 0.1~1mm and mix them uniformly. The mixing ratio is 8% by weight of carbonaceous material, 33% wollastonite, and 30% power plant ash. Limestone 4%, soda ash 15%, cryolite 10%, make mixed material, then add lithium hydroxide, obtain lithium doped material, the addition of lithium hydroxide accounts for 3.5% of mixed material; Described carbonaceous material is activated carbon;

[0033] Adding water to the lithium-doped material and stirring it into a slurry, wherein water accounts for 25% of the total weight of the slurry;

[0034] Dry the slurry at 400°C for 1 hour to make powdered ferritic stainless steel continuous casting mold flux with a particle size of 0.5-1.5mm;

[0035] The chemical composition of continuous casting mold flux for ferritic stainless steel is CaO40% by weight, SiO2 30%, Al 2 o 3 6%, MgO3%, Na 2 O9%, CaF 2 4%, Li 2 O2%, C6%; alkalinity is 1.3;...

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Abstract

The invention discloses continuous casting mold powder for ferrite stainless steel and a preparation method thereof. The mold powder comprises the following components in percentage by weight: 20-40% CaO, 30-50% of SiO2, 35-10% of Al2O, 1-5% of MgO, 1-15% of Na2O, 1-10% of CaF2, 1-5% of Li2O and 2-8% of C, wherein the particle size is 0.5-1.5 millimeters. The preparation method comprises the following steps: (1) crushing and uniformly mixing carbon material, wollastonite, waste ash, limestone, soda ash and cryolite, and adding lithium hydroxide into the mixture to obtain a lithium-doped material; (2) adding water and stirring to obtain slurry; and (3) drying the slurry and preparing powdery continuous casting mold powder for ferrite stainless steel; or making the slurry into particles by a spraying granulation method, and roasting to obtain the continuous casting mold powder for ferrite stainless steel. According to the invention, the viscosity, melting temperature, crystallization rate and dissolution and absorption rate of TiN of the continuous casting mold powder meet the requirements of continuous casting; and the continuous casting mold powder has the characteristics of low preparation cost, simple process and the like and has a good application prospect.

Description

technical field [0001] The invention relates to continuous casting mold slag and a preparation method thereof, in particular to a continuous casting mold slag for ferritic stainless steel and a preparation method thereof. Background technique [0002] Among the stainless steels produced every year in the world, nickel-containing austenitic stainless steel occupies a dominant position in the market due to its good performance. However, with the shortage of nickel resources and the sharp rise in nickel prices, the production and use of ferritic stainless steel will increase. Proportion has become a new idea for the survival and development of the industry. [0003] With the in-depth research and development of ferritic stainless steel, its production and application technology has been continuously improved and perfected, overcoming some performance deficiencies in the past, the quality has been greatly improved, and the application range has been continuously expanded. Ferri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 刘承军孙丽枫王宏坡娄占峰姜茂发
Owner NORTHEASTERN UNIV
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