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Modifier for improving morphology of manganese sulfide in steel and preparation and use method thereof

A modifier, manganese sulfide technology, applied in the field of iron and steel metallurgy, can solve the problems of refining slag adsorption, reduce and control the effect of sulfide in steel, and achieve the effects of refining grains, improving anisotropy, and small size

Active Publication Date: 2021-05-07
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method adds micron-sized low-melting point oxides, which are easy to float up and be absorbed by refining slag, reducing the effect of controlling sulfide in steel

Method used

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  • Modifier for improving morphology of manganese sulfide in steel and preparation and use method thereof
  • Modifier for improving morphology of manganese sulfide in steel and preparation and use method thereof
  • Modifier for improving morphology of manganese sulfide in steel and preparation and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of a modifier for improving the morphology of manganese sulfide in steel, comprising the steps of:

[0041] (1) Nanoscale ZrO 2 , micron-sized iron powder and dehydroxylation solvent are added to the ball mill for high-energy ball milling pre-dispersion, the ZrO 2 , the addition ratio of iron powder and dehydration solvent is, ZrO 2 : iron powder: dehydroxylation solvent=1g: 10g: 20ml; the high energy ball milling time is 8 hours, and the high energy ball milling speed is 800r / min; the dehydroxylation solvent is ethanol and propanol mixed solvent with a volume ratio of 1:1 ; Raw material ZrO 2 The particle size is 150nm, and the iron powder particle size is 5.0μm;

[0042] (2) Perform crystallization treatment on the reagent obtained after step (1) high-energy ball mill pre-dispersion in a vacuum drying oven, the vacuum degree of the drying oven is figure 2 shown;

[0043] (3) The powder obtained in step (2) is subjected to molding processing b...

Embodiment 2

[0050] A preparation method of a modifier for improving the morphology of manganese sulfide in steel, comprising the steps of:

[0051] (1) Nanoscale ZrO 2 , micron-sized iron powder and dehydroxylation solvent ethanol are added to the ball mill for high-energy ball milling pre-dispersion, and the ZrO 2 , the addition ratio of iron powder and dehydration solvent ethanol is, ZrO 2 : Iron powder: ethanol=1g: 5g: 12ml; The high-energy ball milling time is 15 hours, and the high-energy ball milling speed is 400r / min; Raw material ZrO 2 The particle size is 250nm, and the iron powder particle size is 20.0μm;

[0052] (2) Perform crystallization treatment on the reagent obtained after step (1) high-energy ball mill pre-dispersion in a vacuum drying oven, the vacuum degree of the drying oven is <100Pa, the drying temperature is 50°C, and the drying time is 10 hours to obtain dry crystallized powder ;

[0053] (3) The powder obtained in step (2) is subjected to molding treatment, ...

Embodiment 3

[0060] A preparation method of a modifier for improving the morphology of manganese sulfide in steel, comprising the steps of:

[0061] (1) Nanoscale ZrO 2 , micron-sized iron powder and dehydration solvent methanol are added to the ball mill for high-energy ball milling pre-dispersion, and the ZrO 2 , the addition ratio of iron powder and methanol for dehydration solvent is, ZrO 2 : iron powder: methanol=1g: 8g: 15ml; the high energy ball milling time is 12 hours, and the high energy ball milling speed is 600r / min; raw material ZrO 2 The particle size is 200nm, and the particle size of micron iron powder is 10.0μm;

[0062] (2) Perform crystallization treatment on the reagent obtained after step (1) high-energy ball mill pre-dispersion in a vacuum drying oven, the vacuum degree of the drying oven is <100Pa, the drying temperature is 45°C, and the drying time is 10 hours to obtain dry crystallized powder ;

[0063] (3) The powder obtained in step (2) is subjected to moldin...

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Abstract

The invention provides a modifier for improving the morphology of manganese sulfide in steel and a preparation and use method thereof. The modifier comprises the components of nanoscale ZrO2 and micron-sized iron powder, and the microstructure of the modifier is that the micron-sized iron powder wraps the nanoscale ZrO2, wherein the particle size of the nanoscale ZrO2 is 150-250 nm, and the particle size of the micron-sized iron powder is 5.0-20.0 microns. The preparation method comprises the following steps that high-energy ball milling pre-dispersion, drying crystallization and shaping treatment are carried out on the nanoscale ZrO2 and the micron-sized iron powder to prepare the modifier. The use method comprises the following step that the modifier is added after a ladle refined. In the cooling and solidification process of the manganese sulfide morphology modifier, manganese sulfide can be separated out with the nanoscale ZrO2 as a heterogeneous nucleation core, formed composite inclusions are spherical or fusiform, the purpose of improving the morphology of the manganese sulfide is achieved, and meanwhile, the composite inclusions are small in size and uniform in distribution, generation of intragranular acicular ferrite can further be induced, and grains are refined.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, in particular to a modifier for improving the appearance of manganese sulfide in steel and its preparation and use method. Background technique [0002] Manganese sulfide inclusions are one of the common non-metallic inclusions in steel. For most steels, their size and shape have a great influence on the properties of steel. According to the morphology of manganese sulfide inclusions, it can be divided into three types, type I is spherical, type II is fan-shaped or chain-shaped, and type III is polyhedral or irregular. Due to the good deformability of manganese sulfide, strip-shaped inclusions will extend along the rolling direction during the rolling process. Such long strip-shaped manganese sulfide inclusions will not only make the mechanical properties of the steel anisotropic, but also deteriorate the mechanical properties of the steel. Lateral performance, but also cause steel crack...

Claims

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Application Information

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IPC IPC(8): C21C7/076
CPCC21C7/076Y02P10/20
Inventor 战东平杨永坤王荣健刘新李国胜姜周华雷洪
Owner NORTHEASTERN UNIV
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