Semi-steel steelmaking converter post-furnace desulfurization method

A steelmaking converter and post-furnace technology, which is applied in the field of post-furnace desulfurization of semi-steel steelmaking converters, can solve the problems of sulfur return and high oxygen activity, achieve low process cost, and avoid the effect of post-furnace sulfur return

Active Publication Date: 2018-11-30
SICHUAN PAN YAN TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The present invention aims at the technical problem of high oxygen activity in the current converter steelmaking, leading to sulfur return, and provides a desulfurization method after the converter for semi-steel steelmaking: add calcium carbide to the ladle during the tapping process of the converter, blow argon throughout the ladle, Then the oxygen is fixed on the small platform, and the aluminum wire is fed after the oxygen is fixed, so as to realize the desulfurization after the converter furnace

Method used

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  • Semi-steel steelmaking converter post-furnace desulfurization method

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Embodiment

[0026] A 120t converter in a factory uses semi-steel steelmaking to smelt SPHC steel. The oxygen activity and sulfur content of molten steel are measured at the end of the converter. During the tapping process, calcium carbide is used for preliminary deoxidation. The ladle is blown with argon throughout the process. The amount of slag is controlled at no more than 20 mm; then the oxygen is fixed at the small platform station, and after the oxygen is fixed, the aluminum wire (10 mm in diameter) is fed to adjust the degree of deoxidation, and the sulfur content after the treatment of the small platform is tested. The specific parameters and results are shown in Table 1.

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Abstract

The invention discloses a semi-steel steelmaking converter post-furnace desulfurization method and belongs to the technical field of metallurgy. Aiming at the technical problem of resulfurization caused by high oxygen activity in present converter steelmaking, the invention provides the semi-steel steelmaking converter post-furnace desulfurization method which comprises the steps that calcium carbide is added to a steel ladle in the converter steel output process, argon is blown to the steel ladle in the whole process, then oxygen fixation is performed on a little platform, and aluminum wiresare fed in after oxygen fixation, so that converter post-furnace desulfurization is realized. By means of the semi-steel steelmaking converter post-furnace desulfurization method, post-furnace resulfurization can be avoided, post-furnace desulfurization can be further realized, the desulfurization rate reaches 40% or above, and control of the sulfur content in molten steel is facilitated.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a desulfurization method after a converter for semi-steelmaking. Background technique [0002] The sulfur content in the steel directly affects the service performance of the steel. Excessive sulfur content in the steel will lead to the deterioration of the hot workability of the steel, resulting in the "hot embrittlement" of the steel; Crack; at the same time, the plasticity of steel also significantly deteriorates with the increase of sulfur content. [0003] The traditional semi-steel steelmaking process generally adopts "hot metal pretreatment→top-bottom combined blowing converter→LF→continuous casting". Generally, desulfurization is performed in the process of hot metal pretreatment and LF electric heating: the post-converter operation is to add aluminum and iron to the ladle for deoxidation. LF adds lime, aluminum granules and other slagging materials for re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
CPCC21C7/0056C21C7/064
Inventor 陈路曾建华梁新腾王建
Owner SICHUAN PAN YAN TECH
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