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Control method for inclusions in heavy rail steel

A control method and inclusion technology, applied in the manufacture of converters, etc., can solve the problems of low desulfurization efficiency and no consideration of inclusions, etc., and achieve high desulfurization efficiency, desulfurization efficiency and stable effects

Active Publication Date: 2015-10-14
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 a S content of 0.016%. After the converter smelting is finished, tapping begins. During the tapping process, a silicon-calcium-barium alloy is added to the ladle for deoxidation. The addition amount is 2.5kg silicon-calcium-barium and silicon-calcium per ton of molten steel. After the addition of barium is completed, other alloys required for the steel type are added immediately. When the tapping volume is 90 tons, adding active lime to the ladle is 5kg per ton of molten steel. After tapping, add calcium carbide evenly to the slag surface of the ladle to add 0.2kg per ton of molten steel. In the above-mentioned tapping process, the flow rate of argon blowing at the bottom of the ladle is 60 NL / min. After tapping, the bottom argon flow rate of 50NL / min is used to blow argon for 6 minutes, and then the molten steel is sent to LF for refining.

[0051] B, LF furnace refining

[0052] After the molten st...

Embodiment 2

[0059] A, converter smelting

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

[0061] B, LF furnace refining

[0062] After the molten steel arrives at the...

Embodiment 3

[0069] A, converter smelting

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

[0071] B, LF furnace refining

[0072] After the molten steel arrives at the LF station, turn on t...

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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 steel smelting, in particular to a method for controlling heavy rail steel inclusions. Background technique [0002] Steel rail is the main component of railway track. In the process of railway transportation, it provides effective support and guidance for the locomotive and needs to withstand the huge vertical pressure from the wheels. Based on the development needs of my country's infrastructure construction, railway transportation is developing at a rapid pace, and is constantly becoming high-speed and heavy-duty. This undoubtedly puts forward more stringent requirements on the quality of the rail. When the rail is in contact with the wheel, it is subjected to the reciprocating and variable load of the locomotive loop, and its purity has an important influence on the fatigue life of the rail. [0003] Because the inclusions in the steel hinder the continuity of the steel matrix structure, the steel separate...

Claims

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Application Information

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Patent Type & Authority Applications(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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