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A control method for heavy rail steel inclusions

A control method and technology for inclusions, applied in the direction of manufacturing converters, etc., can solve the problems of not considering inclusions, low desulfurization efficiency, etc., and achieve the effect of stable desulfurization efficiency and high desulfurization efficiency.

Active Publication Date: 2017-01-04
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent No. CN102732667A discloses a method for rapid desulfurization of heavy rail steel refining, which enables heavy rail steel to quickly reduce MnS inclusions in the LF furnace, but this patent does not consider other inclusions
Patent No. CN104313245A discloses a method for rapid desulfurization of heavy rail steel refining, which enables the heavy rail steel to achieve rapid desulfurization in the LF furnace while reducing the level of heavy rail steel A-type inclusions, but the patent The desulfurization efficiency is low, and it only acts on type A inclusions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A, converter smelting

[0050] The molten iron entering the converter has an S content of 0.016%. After the converter smelting is completed, the steel is tapped. During the tapping process, a silicon-calcium-barium alloy is added to the ladle for deoxidation. The amount added is 2.5kg of silicon-calcium-barium and silicon-calcium After the addition of barium is completed, other alloys required for the steel grade are added immediately. When tapping is 90 tons, add active lime in ladle and add 5kg for every ton of molten steel. After tapping, evenly add calcium carbide to the ladle slag surface to add 0.2kg per ton of molten steel. In the above tapping process, the argon gas flow rate of ladle bottom blowing is 60NL / min. After tapping, blow argon for 6 minutes with a bottom blowing argon flow rate of 50NL / min, and then send the molten steel to LF for refining.

[0051] B, LF furnace refining

[0052] After the molten steel arrives at the LF station, turn on the botto...

Embodiment 2

[0059] A, converter smelting

[0060] The molten iron entering the converter has an S content of 0.020%. After the converter smelting is completed, the steel is tapped. During the tapping process, a silicon-calcium-barium alloy is added to the ladle for deoxidation. The amount of addition is 3.5kg per ton of molten steel. Immediately after the addition is completed, other alloys required by the steel grade are added. When the tapping is 90 tons, add active lime per ton of molten steel 5kg in the ladle. After tapping, 0.4kg of calcium carbide per ton of molten steel is evenly added to the ladle slag surface. In the above tapping process, the argon gas flow rate of ladle bottom blowing is 60NL / min. After tapping, blow argon for 6 minutes with a bottom blowing argon flow rate of 50NL / min, and then send the molten steel to LF for refining.

[0061] B, LF furnace refining

[0062] After the molten steel reaches the LF station, turn on the bottom blowing argon to blow the argon ...

Embodiment 3

[0069] A, converter smelting

[0070] The molten iron entering the converter has an S content of 0.010%. After the converter smelting is completed, the steel begins to be tapped. During the tapping process, a silicon-calcium-barium alloy is added to the ladle for deoxidation. The amount of addition is 3.0kg per ton of molten steel. Then add other alloys required by the steel grade. When tapping is 90 tons, add active lime per ton of molten steel 3kg in the ladle. After tapping, 0.3 kg of calcium carbide per ton of molten steel is evenly added to the slag surface of the ladle. In the above tapping process, the argon gas flow rate of ladle bottom blowing is 60NL / min. After tapping, blow argon for 6 minutes with a bottom blowing argon flow rate of 50NL / min, and then send the molten steel to LF for refining.

[0071] B, LF furnace refining

[0072] After the molten steel reaches the LF station, turn on the bottom blowing argon to blow the argon at the bottom of the ladle. The ...

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PUM

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Abstract

The invention discloses a control method for inclusions in heavy rail steel. The method includes the following steps of converter smelting, ladle furnace (LF) refining, Ruhrstahl Heraeus (RH) vacuum treatment and continuous casting. According to the refining method, active lime is adopted in a converter, and active lime, silicon carbide and quartz sand are used for slagging in the refining process, so that the S content of molten steel is controlled to be reduced to below 0.006%, and it is guaranteed that all grades of the inclusions in the steel are lower than or equal to 2.0. According to the control method for the inclusions in the heavy rail steel, relatively high basicity is adopted, desulphurization efficiency is high and stable, and the method can obviously reduce various inclusions in the molten steel.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a method for controlling heavy rail steel inclusions. Background technique [0002] Steel rails are the main components of railway tracks. During railway transportation, to provide effective support and guidance for locomotives, they need to bear huge vertical pressure from wheels. Based on the development needs of my country's infrastructure construction, railway transportation is developing at a rapid speed, and it is becoming more and more high-speed and heavy-duty. This undoubtedly puts forward more stringent requirements on the quality of rails. When the rail is in contact with the wheel, it bears the reciprocating and variable load of the locomotive, and its purity has an important impact on the fatigue life of the rail. [0003] Due to the hindering effect of the inclusions in the steel on the continuity of the steel matrix structure, the steel is separat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C5/28
Inventor 陈亮陈天明杨森祥郭华黄禹明李红光黄德胜杨文中陈雄冯远超
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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