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Technological process for achieving size miniaturization of inclusion in Si deoxidized steel

A technology of process flow and inclusions, which is applied in the field of process flow to realize the miniaturization of inclusions in Si deoxidized steel. It can solve the problems that the deformation performance is not conducive to the miniaturization of inclusions, and the synergy has not been studied, so as to achieve miniaturization. , Improve the effect of drawing performance

Active Publication Date: 2016-11-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The deficiencies of related technologies and researches are: on the one hand, good deformation performance is not conducive to the miniaturization of inclusion size; Synergistic effect on object size miniaturization

Method used

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  • Technological process for achieving size miniaturization of inclusion in Si deoxidized steel
  • Technological process for achieving size miniaturization of inclusion in Si deoxidized steel
  • Technological process for achieving size miniaturization of inclusion in Si deoxidized steel

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Embodiment approach

[0018] (1) Add low-aluminum ferrosilicon and low-aluminum ferromanganese to the ladle for about 1 / 5~2 / 5 of the time when the steel is tapped from the converter / electric furnace;

[0019] (2) During ladle refining, the slag must be controlled at the same time with an alkalinity of about 0.5~1.0, Al 2 o 3 The content is controlled at 0~10wt%, (Fe t O+MnO)<2wt%;

[0020] (3) The oxygen concentration in the ladle during refining and in the tundish during pouring is controlled below 0.5%: argon gas must be injected into the ladle during refining to ensure a slightly positive pressure atmosphere in the furnace, and Ar gas must be injected into the tundish before pouring. ~20min and continuous flow of Ar gas for sealing operation during the whole pouring process;

[0021] (4) Large-section continuous casting slabs are used for continuous casting, and the continuous casting slabs are heated to 1100~1270°C before hot rolling and kept for a long time (3~10 hours) before hot rolling; ...

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Abstract

The invention belongs to the field of the metallurgical industry and discloses a technological process for achieving size miniaturization of an inclusion in Si deoxidized steel. The technological process comprises four steps of steelmaking, continuous casting, hot rolling and cold drawing; the inclusion is controlled in a low-melting-point spessartite inclusion and tridymite area in a centralized manner in the steelmaking step by controlling conditions in the four steps; and a two-phase inclusion comprising a MnO-SiO2-Al2O3 parent phase and a SiO2 quartz phase precipitated on the parent phase is generated afterwards; the two-phase inclusion is subjected to multiple passes of hot rolling to gradually extend and deform; phase separation between the MnO-SiO2-Al2O3 parent phase and the SiO2 quartz phase is gradually achieved by utilizing the differences of the deformation performance of the MnO-SiO2-Al2O3 parent phase and the deformation performance of the SiO2 quartz phase based on multiple passes of cold deformation machining; and the hard quartz phase is used for cutting the MnO-SiO2-Al2O3 parent phase, and size miniaturization of the inclusion is finally achieved.

Description

technical field [0001] The invention belongs to the field of metallurgical industry, and is a technological process for realizing the miniaturization of inclusions in Si deoxidized steel. Background technique [0002] Si is a deoxidizer widely used in steel production, such as the production of suspension springs, cutting steel wires, steel cords, valve springs and other wire rods. Large-sized, non-deformable inclusions are the main reason for the drawing fracture and service fatigue failure of these steels. Since the inclusions cannot be completely removed from the steel, this type of Si deoxidized steel generally requires that the composition of the inclusions be controlled within MnO-SiO 2 -Al 2 o 3 The composition content of each component in the low melting point region of spessartine garnet in the phase diagram is: MnO=30~50wt%, SiO 2 =30~50wt%, Al 2 o 3 =10~20wt%. [0003] The deficiencies of related technologies and research are: on the one hand, good deformat...

Claims

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Application Information

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IPC IPC(8): C21D8/06
CPCC21D8/065
Inventor 王新华姜敏王昆鹏王郢赵昊乾
Owner UNIV OF SCI & TECH BEIJING
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