Steel ladle powder injection desulfuration refining process for low-sulfur steel production

A low-sulfur steel and ladle technology, applied in the field of steelmaking, can solve the problems of unretrieved, unstable process, low utilization rate of equipment, etc., and achieve the effect of simple operation and meeting the needs of mass production

Active Publication Date: 2011-10-12
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the field of iron and steel smelting technology, there are relatively few domestic and foreign manufacturers applying the ladle powder spraying desulfurization process. The main reasons are that the process is unstable, the desulfurization effect is not good, and the utilization rate of equipment is not high. Ladle Powder Spraying Desulfurization Refining Process for Steel Production
[0004] The current status of the process: For high-quality steel with a sulfur content requirement of ≤0.0020%, LF furnace refining or VD refining is generally used for deep desulfurization of molten steel, and no low-sulfur steel is smelted using ladle powder spraying desulfurization technology related patents

Method used

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Embodiment 1

[0017] Steel type X80, using the process of the present invention to smelt low-sulfur steel with ladle powder spraying and desulfurization, the steel output of the converter is 100 tons, the steel is tapped by strong deoxidation of aluminum and iron, and the amount of aluminum and iron added is 5.0kg / t steel; Add aluminum particles on the surface to deoxidize the slag surface, the addition amount is 0.5kg / t steel; the oxidizing property of the slag from the ladle to the powder spraying desulfurization station is FeO%+MnO%=3.5%; The percentage is 0.070%; the working pressure of the ladle powder spraying desulfurization delivery carrier gas is 3.5bar, and the carrier gas flow rate is 45m 3 / h; Ladle powder injection desulfurization injection speed 50kg / min, injection powder dosage 5.5kg / t steel. The sulfur content in the steel is removed from 54ppm to 10ppm, and the desulfurization rate of the powder spraying process is 81.48%.

Embodiment 2

[0019] Steel type X70, using the process of the present invention to smelt low-sulfur steel with ladle powder spraying and desulfurization, the steel output of the converter is 100 tons, the steel is tapped by strong deoxidation of aluminum and iron, and the amount of aluminum and iron added is 4.0kg / t steel; Add aluminum particles on the surface to deoxidize the slag surface, the addition amount is 0.45kg / t steel; the oxidizing property of the slag from the ladle to the powder spraying desulfurization station is FeO%+MnO%=3.0%; The percentage is 0.065%; the working pressure of the ladle powder spraying desulfurization delivery carrier gas is 4.0bar, and the carrier gas flow rate is 55m 3 / h; Ladle powder desulfurization injection speed 50kg / min, injection powder dosage 6.0kg / t steel. The sulfur content in the steel is removed from 80ppm to 12ppm, and the desulfurization rate of the powder spraying process is 85.0%.

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Abstract

The invention relates to a steel ladle powder injection desulfuration refining process for low-sulfur steel production. The process is characterized in that: 3.0 to 6.5kg/t of aluminum iron for strong deoxidation is adopted in converter tapping; 0.4 to 0.6kg/t of aluminum for slag surface deoxidation is added on the steel ladle slag surface after tapping is finished; the oxidation property (FeO%+Mn%) of station reaching top slag of steel ladles is less than or equal to 3.5 percent; the temperature of the molten steel reaching a powder injection desulfuration station is 1,610 to 1,640 DEG C, and Alt in the steel is 0.040 to 0.090 percent; the working pressure of steel ladle powder injection desulfuration delivery carrier gas is 3.0 to 4.0bar, and the flow is 40 to 60m<3>/h; and the powder injection velocity of steel ladle powder injection desulfuration is 40 to 60kg/min, and the consumption of the injection powder is 4.0 to 6.0 kg/t of steel. After the steel ladle powder injection desulfuration process is adopted, the sulfur content of the steel can be reduced from 50-80ppm to within 12ppm, and the desulfuration rate can reach 78.0 to 85.0 percent.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a ladle powder-spraying desulfurization refining process for low-sulfur steel production. When low-sulfur steel is smelted, ladle powder-spraying desulfurization equipment is used to carry out deep desulfurization treatment, thereby realizing sulfur in low-sulfur steel content control. Background technique [0002] In addition to special steel types, sulfur is a harmful element in steel, which can cause hot embrittlement of steel, and can also adversely affect the mechanical properties of steel by forming sulfide inclusions; when the sulfur content in steel is high, the surface of steel is prone to Corrosion reduces the corrosion resistance of steel, and also reduces the impact toughness of steel. With the increasing demand for high-grade steel grades, the quality requirements for steel products are becoming more and more stringent. During the smelting process, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
Inventor 李战军李本海李永东刘金刚姜中行王文军朱志远王彦峰柴玉国陈霞郝宁吴斌蒋海涛孙硕猛王东柱史志强张建师杨荣光王立峰危尚好李广双谢翠红刘成闫新慧杨国伟韦耀环高媛
Owner SHOUGANG CORPORATION
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