Smelting process for reducing desulfurization rate of molten sulfur bearing steel

A technology for desulfurization rate and sulfur-containing steel, applied in the field of metallurgical industry, can solve the problems of unfavorable sulfur-containing steel in stable control, reduction of steel quality level, secondary pollution, etc., to ensure the purity of molten steel, less slag, convenient The effect of promoting the application

Inactive Publication Date: 2018-03-06
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

Due to the secondary oxidation of the molten steel and the boiling of the molten steel after the line feeding operation, a large amount of air is absorbed, which causes secondary pollution to the already relatively pure molten steel, and there is not enough time in the subsequent sequence to promote the floating of the secondary polluted molten steel inclusions , so that the quality level of steel is reduced, and the desulfurization rate of such a process is high, which is not conducive to the stable control of sulfur in sulfur-containing steel

Method used

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  • Smelting process for reducing desulfurization rate of molten sulfur bearing steel
  • Smelting process for reducing desulfurization rate of molten sulfur bearing steel
  • Smelting process for reducing desulfurization rate of molten sulfur bearing steel

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Embodiment 1

[0024] Adopt the inventive method to smelt hot-rolled round steel 38MnVS (standard requirement [S] 0.045~0.065%, [O]≤20ppm), comprise the following steps:

[0025] 1) The tapping temperature of the electric furnace is 1685°C. During the tapping process, 5.5kg / t of pre-melted slag and deoxidizer are added to the ladle.

[0026] 1.0kg / t steel, 101 tons of steel;

[0027] 2) Hoist the primary steel ladle to the VD position, press the argon blowing pipe, and feed the sulfur wire according to the requirement of 0.065% in consideration of the sulfur recovery rate, take samples to analyze the composition and determine the hydrogen, cover the vacuum cover to evacuate, and in high vacuum Degree (133Pa) under the time of 16 minutes;

[0028] 3) Lift the ladle to the LF furnace position, connect the argon gas pipe for power transmission, add lime 2kg / t steel, fluorite 50kg, add SiC powder 100kg in batches to the slag surface after the slag is melted, and feed Al wire 1.5m / t steel, Keep...

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Abstract

The invention relates to a smelting process for reducing the desulfurization rate of molten sulfur bearing steel. The smelting process comprises the following steps: performing primary smelting in anelectric furnace, feeding a sulfur line, performing vacuum degassing in a VD (Vacuum Degassing) furnace, performing refining in an LF (Ladle Furnace), and performing continuous casting. According to the smelting process, the VD furnace is arranged before LF treatment, molten steel is subjected to vacuum treatment of the VD furnace firstly, then effective dehydrogenation is achieved, and the oxygencontent and occluded foreign substances in the steel are reduced under beneficial vacuum conditions; and the operation of sulfur line feeding is implemented before vacuum treatment of the VD furnace,the comprehensive sulfur removal rate can be reduced by 53% or greater by further setting the operation modes of the VD furnace, the content of sulfur in the steel is effectively stabilized, and desulfurization because of molten steel smelting is reduced.

Description

technical field [0001] The invention belongs to the technical field of the metallurgical industry, and more specifically relates to a sulfur-containing molten steel smelting process. Background technique [0002] For the production of sulfur-containing steel, the production process of conventional steel billets is: primary furnace → LF refining → VD treatment → then feed sulfur line → continuous casting or mold casting operation. Due to the secondary oxidation of the molten steel and the boiling of the molten steel after the line feeding operation, a large amount of air is absorbed, which causes secondary pollution to the already relatively pure molten steel, and there is not enough time in the subsequent sequence to promote the floating of the secondary polluted molten steel inclusions , so that the quality level of steel is reduced, and such a process has a high desulfurization rate, which is not conducive to the stable control of sulfur in sulfur-containing steel. Conte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/06C21C7/10C21C7/072
CPCY02P10/20
Inventor 曹红福黄镇许晓红张旭东彭继承
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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