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Semisteel steelmaking carbon content control method and semisteel steelmaking method

A control method and carbon content technology, which are applied in the field of semi-steel steelmaking, can solve the problems of physical temperature difference in semi-steel steelmaking, and achieve the effects of controlling the consumption of steel materials, avoiding low utilization rate, and increasing the temperature of molten steel

Active Publication Date: 2014-03-12
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 problem of poor physical temperature of semi-steelmaking in steelmaking plants, and provide a method for controlling the carbon content 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 contains 3.52% C and 0.01% Si by weight percentage.

[0022] In the process of removing semi-steel from the ladle, 1.5kg / (t semi-steel) of ferrosilicon and 5kg / (t semi-steel) of silicon carbide are added to the ladle; then the semi-steel is blended into the steelmaking furnace, Oxygen blowing smelting with oxygen lance and adding 35kg / (t semi-steel) lime, 15kg / (t semi-steel) high magnesium lime, 1kg / (t semi-steel) composite slagging agent according to blowing, the initial slag formation time is 2.2min , After the temperature of the molten steel reaches 1670°C, the oxygen lance is raised and the blowing is stopped. The carbon content of the obtained molten steel is 0.08%, and the steel material consumption per ton of steel is 1050kg.

example 2

[0024] In this example, the semi-steel is the molten steel after the vanadium-containing molten iron is blown by the vanadium-extracting converter, and it 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 and 1kg / (t semi-steel) of silicon carbide are added to the ladle; then the semi-steel is mixed into the steelmaking furnace, and the Oxygen blowing smelting with oxygen lance and adding 36kg / (t semi-steel) lime and 10kg / (t semi-steel) high-magnesium lime according to blowing. The initial slag formation time is 2.6min. After the molten steel temperature reaches 1680°C, the oxygen lance is taken out Stop blowing. The carbon content of the obtained molten steel is 0.11%, 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 the semi-steel into the steelmaking converter, add 1.5kg / (t semi-steel) of ferrosilicon and 5kg / (t semi-steel) of silicon carbide into the steelmaking converter; / (t semi-steel) lime, 13kg / (t semi-steel) high-magnesium lime, the initial slag formation time is 3.1min, after the molten steel temperature reaches 1690°C, take out the oxygen lance and stop blowing. The carbon content of the obtained molten steel is 0.06%, 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 semisteel steelmaking carbon content control method and a semisteel steelmaking method. The carbon content control method comprises the following steps: in the process of discharging semisteel into a ladle, adding 1.5-6.0kg / (t semisteel) silicon iron and 1.0-5.0kg / (t semisteel) silicon carbide into the ladle; adding the semisteel into a steelmaking furnace, and lowering an oxygen lance to perform oxygen blowing smelting while adding related slagging materials and alloys according to the blowing smelting requirements; and after the molten steel temperature reaches the requirement, lifting the oxygen lance, wherein the semisteel is molten steel prepared by carrying out vanadium extraction converter or dephosphorization converter blowing on vanadium-containing molten iron, and contains 3.20-3.80 wt% of C and 0.001-0.05 wt% of Si. The method can shorten the early slag formation time, enhance the steelmaking slagging speed, enhance the molten steel temperature, effectively control the steel material consumption in the steelmaking process, and avoid the problem of low utilization ratio of carbon carburizing materials.

Description

technical field [0001] The invention belongs to the technical field of semi-steel making steel, and specifically relates to a semi-steel making carbon content control method and a semi-steel steelmaking method adopting the carbon content control method. 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 than that of molten iron, in order to ensure the smooth progress of smelting, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28
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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