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Dephosphorizing steelmaking method for increasing manganese content in molten steel at terminal of convertor

A manganese content, molten steel technology, applied in the field of metallurgy, to achieve the effect of increasing consumption and reducing consumption

Active Publication Date: 2014-09-24
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

[0005] In the prior art, there is no report on a steelmaking method that can not only increase the manganese content at the end of the converter but also quickly dephosphorize the slag during semi-steel making

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This example is used to illustrate the dephosphorization steelmaking method of the present invention for increasing the manganese content of molten steel at the end point of the converter.

[0028] Using semi-steel smelting, after the semi-steel is mixed into the steelmaking converter, add 3kg of silicon-increasing agent / ton of steel, then add 40kg of continuous casting slab cutting head and tail / ton of steel and blow it with a gun, and the progress of oxygen blowing is 30% Add 3kg manganese ore / ton of steel to the furnace and continue converter blowing. During the oxygen blowing process, when the oxygen blowing progress is 0-70%, the bottom argon blowing intensity is 0.03m 3 / (min tons of steel), when the oxygen blowing progress is 70-100%, the bottom argon blowing intensity is 0.05m 3 / (min tons of steel), after the end of oxygen blowing, increase the intensity of bottom blowing argon to 0.13m 3 / (min·ton of steel), and after stirring for 2 minutes under the intensi...

Embodiment 2

[0030] This example is used to illustrate the dephosphorization steelmaking method of the present invention for increasing the manganese content of molten steel at the end point of the converter.

[0031] Using semi-steel smelting, after the semi-steel is mixed into the steelmaking converter, add 5kg of silicon-increasing agent / ton of steel, and then add 50kg of continuous casting slab cutting head and tail / ton of steel and blow it with a gun, and the progress of oxygen blowing is 50% Add 4kg manganese ore / ton of steel to the furnace and continue converter blowing. During the oxygen blowing process, when the oxygen blowing progress is 0-70%, the bottom argon blowing intensity is 0.02m 3 / (min tons of steel), when the oxygen blowing progress is 70-100%, the bottom argon blowing intensity is 0.04m 3 / (min tons of steel), after the end of oxygen blowing, increase the intensity of bottom blowing argon to 0.1m 3 / (min·ton of steel), and after stirring for 3 minutes under the inte...

Embodiment 3

[0033] This example is used to illustrate the dephosphorization steelmaking method of the present invention for increasing the manganese content of molten steel at the end point of the converter.

[0034] Semi-steel is smelted. After the semi-steel is mixed into the steelmaking converter, 6kg of silicon-increasing agent / ton of steel is added, and then 60kg of continuous casting slabs are added to cut the head and tail / ton of steel and blown by the gun. The progress of oxygen blowing is 70%. Add 5kg manganese ore / ton of steel to the furnace and continue converter blowing. During the oxygen blowing process, when the oxygen blowing progress is 0-70%, the bottom argon blowing intensity is 0.04m 3 / (min tons of steel), when the oxygen blowing progress is 70-100%, the bottom argon blowing intensity is 0.06m 3 / (min tons of steel), after the end of oxygen blowing, increase the intensity of bottom blowing argon to 0.15m 3 / (min·ton of steel), and after stirring for 1 min under the i...

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PUM

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Abstract

The invention discloses a dephosphorizing steelmaking method for increasing manganese content in molten steel at a terminal of a convertor. The method includes following steps: a silicon-increasing agent is added at a ratio of 2-8 kg of the silicon-increasing agent per ton of steel to the convertor after semi-steel being added to the convertor; adding scrap steel at a ratio of 30-90 kg of the scrap steel per ton of the steel to carry out a convertor-blowing process; adding manganese ore at a ratio of 2-10 kg of the manganese ore per ton of the steel when an oxygen-blowing progress rate being 30-70%, wherein a bottom-argon-blowing intensity during the oxygen-blowing process is 0.02-0.06 m<3> per minute per ton of the steel; increasing the bottom-argon-blowing intensity to 0.08-0.16 m<3> per minute per ton of the steel after the oxygen-blowing process being finished; carrying out a stirring process for 1-5 min; and carrying out a tapping process to obtain molten steel. With the method in the invention, initial slag dephosphorization can be quickly formed, scrap steel consumption amount in the convertor and the manganese content in the molten steel at the terminal of the convertor are increased. In addition, phosphorus content in obtained terminal molten steel is lower than 0.006 wt% and total iron content in terminal slag is lower than 20 wt%.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a dephosphorization steelmaking method for increasing the manganese content of molten steel at the end point of a converter. Background technique [0002] my country's Panxi region has unique vanadium-titanium magnetite resources. Vanadium-titanium magnetite is used in blast furnace smelting, and the molten iron contains relatively high vanadium (0.20%-0.40%). In order to realize the comprehensive utilization of resources, the vanadium in molten iron The vanadium extraction operation is carried out through the converter, the carbon mass percentage (3.0%-3.8%) of the semi-steel after vanadium extraction is lower than that of ordinary molten iron, and the content of silicon and manganese heating elements in the semi-steel is traces, so the semi-steel smelting has blowing In the process, there are few acidic slagging substances, single slag system components, late formation of init...

Claims

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Application Information

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IPC IPC(8): C21C5/30C21C5/36
Inventor 陈均曾建华卿家胜梁新腾杨森祥李胜张彦恒黄生权陈路
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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