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Method for improving steelmaking end-point carbon content of semisteel and semisteel steelmaking method

A technology of end-point carbon content and steel-making end-point, applied in the field of semi-steel steelmaking, can solve the problems of physical temperature difference and low end-point carbon content in semi-steel steelmaking, so as to control the consumption of steel materials, increase the temperature of molten steel, and avoid the utilization rate. low effect

Active Publication Date: 2014-03-19
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For example, one of the purposes of the present invention is to solve the problems of poor physical temperature and low carbon content at the end of semi-steelmaking in steelmaking plants, and provide a method for increasing the carbon content at the end of semi-steelmaking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] In this example, the semi-steel is molten steel after vanadium-containing molten iron has been blown in a vanadium-extracting converter, and it contains 3.52% C and 0.01% Si by weight percentage.

[0022] In the process of taking out the semi-steel in the ladle, add 1.5kg / (t semi-steel) of ferrosilicon into the ladle; t semi-steel) lime, 15kg / (t semi-steel) high-magnesium lime, 1kg / (t semi-steel) composite slagging agent, the initial slag formation time is 2.2min, after the molten steel temperature reaches 1650°C, take out the oxygen lance and stop Blowing. The carbon content of the obtained molten steel is 0.11%, and the steel material consumption per ton of steel is 1050kg.

example 2

[0024] In this example, the semi-steel is molten steel after vanadium-containing molten iron has been blown in a vanadium-extracting converter, and contains 3.47% C and 0.01% Si by weight percentage.

[0025]In the process of discharging semi-steel into the ladle, 6kg / (t semi-steel) of ferrosilicon is added to the ladle; Half steel) lime, 10kg / (t half steel) high magnesium lime, the initial slag formation time is 2.6min, after the molten steel temperature reaches 1680°C, take out the oxygen lance and stop blowing. The carbon content of the obtained molten steel is 0.19%, and the steel material consumption per ton of steel is 1051kg.

example 3

[0027] In this example, the semi-steel is molten steel after vanadium-containing molten iron has been blown in a vanadium-extracting converter, and contains 3.55% C and 0.02% Si by weight percentage.

[0028] After blending semi-steel into the steelmaking converter, add 1.5kg / (t semi-steel) of ferrosilicon into the steelmaking converter; (t semi-steel) high magnesium lime, the initial slag formation time is 3.1min, after the molten steel temperature reaches 1670°C, the oxygen lance is raised and blowing is stopped. The carbon content of the obtained molten steel is 0.16%, and the steel material consumption per ton of steel is 1049kg.

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PUM

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Abstract

The invention provides a method for improving the steelmaking end-point carbon content of semisteel and a semisteel steelmaking method. The method comprises: during tapping of semisteel to a ladle, adding 1.5-6.0kg / (t semisteel) ferrosilicon into the ladle; then adding the semisteel into a steelmaking furnace, putting an oxygen lance into the furnace to perform oxygen blowing smelting, and adding related slag making materials and alloys according to blowing requirements, conducting carbon drawing, then performing reblowing according to the carbon content, controlling the end-point carbon content of molten steel at 0.10%-0.20%, taking out the oxygen lance, and stopping blowing. Specifically, the semisteel is molten steel obtained by subjecting vanadium-containing molten steel to a vanadium recovery converter or dephosphorization converter to undergo blowing, and by weight, has a C content of 3.20%-3.80% and an Si content of 0.001%-0.05%. The method provided by the invention can shorten the initial slag forming time, improve the steelmaking and slagging speed, can enhance the molten steel temperature, can effectively control the steel material consumption in the steelmaking process, and can avoid the low utilization problem of carbon recarburization materials.

Description

technical field [0001] The invention belongs to the technical field of semi-steel making steel, and specifically relates to a method for increasing the carbon content of the semi-steel steelmaking end point and a semi-steel steelmaking method using the method for increasing the carbon content of the semi-steel steelmaking end point. Background technique [0002] Generally speaking, semi-steel is obtained after vanadium-containing molten iron ore (for example, vanadium-titanium magnetite) smelted in blast furnace is smelted in vanadium extraction converter or dephosphorization converter. The semi-steel is characterized by low carbon (average around 3.6%), low in silicon (below 0.01%), low in manganese (below 0.05%), insufficient heat source, low content of slagging elements, higher temperature than molten iron, low early oxidation of slag and difficulty in initial slagging . When the semi-steel is used for smelting, since the exothermic elements in the semi-steel are less th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30
Inventor 王建陈炼陈永戈文荪曾建华杜利华蒋龙奎黄德胜
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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