Refining method of rail steel

A technology for rail steel and ladle, applied in the field of rail steel smelting, can solve problems such as low desulfurization efficiency, and achieve the effects of high desulfurization efficiency, desulfurization efficiency and improved cleanliness

Active Publication Date: 2017-03-01
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

But the desulfurization efficiency of this application is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The mass percentage of S in the molten iron entering the converter furnace is 0.016%. After the converter smelting is completed, the steel is tapped. During the tapping process, silicon-calcium-barium alloy is added to the ladle for deoxidation. The addition amount is 2.5kg / t steel, and the addition of silicon-calcium-barium is completed. Immediately after adding other alloys required by the steel grade. When the tapped steel is 90 tons, add active lime 5kg / t steel into the ladle. After tapping, evenly add calcium carbide 0.2kg / t steel 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.

[0034] After the molten steel arrives at the LF station, turn on the bottom argon blowing to carry out argon blowing at the bottom of the ladle. The flow rate of the argon...

Embodiment 2

[0037] The mass percentage content of S in the molten iron entering the converter furnace is 0.020%. After the converter smelting is completed, the steel is tapped. During the tapping process, silicon-calcium-barium alloy is added to the ladle for deoxidation. The addition amount is 3.5kg / t steel, and the addition of silicon-calcium-barium is completed Immediately after adding other alloys required by the steel grade. When the tapped steel is 90 tons, add active lime 5kg / t steel into the ladle. After tapping, 0.4kg / t of calcium carbide 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, argon is blown for 6 minutes at a flow rate of 50Nl / min, and then the molten steel is sent to LF for refining.

[0038]After the molten steel arrives at the LF station, turn on the bottom argon blowing to carry out argon blowing at the bottom of the ladle. The flow rate of the argon blowing...

Embodiment 3

[0041] The mass percentage of S in the molten iron entering the converter furnace is 0.010%. After the converter smelting is completed, the steel is tapped. During the tapping process, silicon-calcium-barium alloy is added to the ladle for deoxidation. The addition amount is 3.0kg / t steel, and the addition of silicon-calcium-barium is completed. Immediately after adding other alloys required by the steel grade. When the tapped steel is 90 tons, add active lime 3kg / t steel into the ladle. After tapping, 0.3kg / t of calcium carbide 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.

[0042] After the molten steel arrives at the LF station, turn on the bottom argon blowing to carry out argon blowing at the bottom of the ladle. The flow rate of the arg...

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PUM

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Abstract

The invention discloses a rail steel refining method. The rail steel refining method includes the steps that in the converter steel tapping process, active lime is adopted for conducting slag washing, and then calcium carbide is adopted for modifying ladle top slag; a modified steel ladle is sent to an LF for conducting slag adjusting, the active lime and the calcium carbide are adopted for refining, adding is carried our two times in the adding process, and the argon flow meets the conditions that the argon flow at the earlier stage ranges from 100 Nl / min to 200 Nl / min, the argon flow at the medium stage ranges from 100 Nl / min to 200 Nl / min, and the argon flow at the later stage ranges from 100 Nl / min to 150 Nl / min. The sulphur content in molten steel obtained after LF processing is smaller than or equal to 0.006%, silica sand is added at the later LF processing stage for reducing the alkalinity of the steel ladle slag, then refining is continuously carried out for an appropriate time, and the steel ladle slag is sent for conducting vacuum processing. The rail steel refining method is suitable for producing high-quality rail steel, and the sulphur content in the steel is smaller than or equal to 0.006%.

Description

technical field [0001] The invention relates to the technical field of rail steel smelting, in particular to a method for refining rail steel. Background technique [0002] In the prior art, the refining method of rail steel produced by the converter-LF-RH-continuous casting process flow has been reported, and for a refining method that adopts the converter to use active lime, and the refining process adopts active lime and quartz sand slagging The method has not been reported. [0003] For example, the patent application number is 201210243888.2, which discloses a method for rapid desulfurization of heavy rail steel refining. This method is to add lime into the ladle during the tapping process of the converter, and the amount of lime added in each ton of molten steel is 3~ 4kg; and when "slag washing" is formed in the tapping process, the sulfur in the LF furnace steel is ≤0.020%; the slag is melted at a temperature of 1510-1530°C, and a deoxidizer is added during the heat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/36C21C7/064C21C7/10
Inventor 陈天明陈亮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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