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A method for controlling the deformability of non-metallic inclusions in steel matrix based on viscosity

A non-metallic inclusion and viscosity control technology, applied in the field of iron and steel metallurgy and steelmaking, can solve the problems of non-metallic inclusion deformation ability determination, steel quality defects, poor deformation ability of alumina inclusions, etc., to reduce steel quality defects, The effect of improving the transformation ability

Active Publication Date: 2022-07-22
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aluminum oxide content in non-metallic inclusions is the decisive factor for the deformation ability of non-metallic inclusions. The aluminum oxide inclusions produced by aluminum deoxidation have poor deformation ability, which will cause many quality defects in steel.
There is also a view that the deformation ability of non-metallic inclusions is related to the melting point of non-metallic inclusions. Liquid non-metallic inclusions have good deformation ability at the rolling temperature. However, in many cases, the non-metallic inclusions are large during the rolling process. Some are pure solid, and the deformation ability of non-metallic inclusions in different solid states is difficult to judge by the melting point of non-metallic inclusions

Method used

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  • A method for controlling the deformability of non-metallic inclusions in steel matrix based on viscosity
  • A method for controlling the deformability of non-metallic inclusions in steel matrix based on viscosity

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Experimental program
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Embodiment 1

[0046] The viscosity was calculated by FactSage thermodynamics software, selecting the Vicosity calculation module. The main component of non-metallic inclusions in the steel matrix is ​​Al by detecting the samples in the continuous casting billet of cord steel by scanning electron microscopy and energy dispersive spectroscopy. 2 O 3 -SiO 2 -MnO, according to the rolling temperature range of 900°C to 1000°C set in the production process, at a rolling temperature of 1000°C, the steel matrix viscosity is 1.2×10 7 Pa·S, calculated as Al 2 O 3 -SiO 2 -The viscosity of non-metallic inclusions and the viscosity of steel matrix under this system of MnO, the minimum value of the viscosity ratio of non-metallic inclusions and steel matrix at this rolling temperature is 1.67×10 -8 condition, the target composition of non-metallic inclusions is 5% Al 2 O 3 -24% SiO 2 -71% MnO with a target rolling temperature of 1000°C. During the refining process, the converter tapping strictly...

Embodiment 2

[0048] The viscosity was calculated by FactSage thermodynamics software, selecting the Vicosity calculation module. The main component of non-metallic inclusions in the steel matrix is ​​Al by detecting the samples in the stainless steel continuous casting billet by scanning electron microscopy and energy dispersive spectroscopy. 2 O 3 -SiO 2 -MnO, according to the rolling temperature range of 1050°C to 1200°C set in the production process, it is determined that the viscosity of the steel matrix is ​​7.0×10 at the rolling temperature of 1200°C 6 Pa S, calculates multiple Al 2 O 3 -SiO 2 -The viscosity of non-metallic inclusions and the viscosity of the steel matrix under the MnO composition system, the minimum value of the viscosity ratio of the non-metallic inclusions and the steel matrix at the rolling temperature is 1.0×10 -7 condition, the target composition of non-metallic inclusions is 19% Al 2 O 3 -20% SiO 2 -61% MnO with a target rolling temperature of 1200°C. ...

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Abstract

The invention relates to a method for controlling the deformation ability of non-metallic inclusions in a steel matrix. Calculate the viscosity ratio of metallic inclusions to steel matrix to determine the target composition and target rolling temperature of non-metallic inclusions under multiple different composition systems. The composition of the non-metallic inclusions is controlled and changed, so that the composition of the non-metallic inclusions reaches the target composition; at the same time, since the non-metallic inclusions with different compositions have different viscosities at different temperatures, the rolling temperature is controlled to be the target temperature. It can improve the deformation ability of non-metallic inclusions in the whole production process, and reduce the quality defects of steel caused by the deformation of non-metallic inclusions.

Description

technical field [0001] The invention relates to a method for controlling the deformability of non-metallic inclusions in a steel matrix based on viscosity, and belongs to the field of iron and steel metallurgy and steelmaking. Background technique [0002] The size, quantity and morphology of non-metallic inclusions in the steel matrix directly affect the properties of the final steel product and the quality defects of the steel. The endogenous non-metallic inclusions in the steel matrix are generated in the deoxidation reaction of the steel matrix during the converter tapping process. Because aluminum has a strong deoxidizing ability, aluminum deoxidation is one of the most commonly used deoxidation processes. The deformability of non-metallic inclusions in the steel matrix determines the properties of steel products, and non-metallic inclusions with poor deformability directly lead to defects in steel products. The content of alumina in non-metallic inclusions is the dete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/076B21B37/74B22D11/117
CPCC21C7/076B22D11/117B21B37/74Y02P10/20
Inventor 任英张立峰杨文李亚琼任强王祎高小勇
Owner UNIV OF SCI & TECH BEIJING