Method for increasing carbon content at end point of converter and semi-steel making method

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

Active Publication Date: 2015-09-16
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 of semi-steel steelmaking and low carbon content at the end point of the steelmaking plant, and provide a method for increasing the carbon content at the end point of the converter

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 is blown by the vanadium extraction converter, and it contains 3.52% C and 0.01% Si by weight percentage, and the half-steel temperature is 1385°C.

[0022] In the process of drawing half-steel into the ladle, add 6kg / (t half-steel) of ferromanganese into the ladle; then add the half-steel into the steelmaking furnace, smelt with oxygen lance and add 35kg / (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, when the temperature of molten steel reaches 1650℃, put out the oxygen lance and stop blowing Practice. The carbon content of the molten steel is 0.21%, and the steel consumption per ton of steel is 1050kg.

example 2

[0024] In this example, the semi-steel is molten steel after vanadium-containing molten iron is blown by the vanadium extraction converter, and it contains 3.47% C and 0.01% Si by weight percentage, and the semi-steel temperature is 1325°C.

[0025] In the process of taking out the semi-steel into the ladle, add 20kg / (t semi-steel) of ferromanganese into the ladle; then add the semi-steel into the steelmaking furnace, smelt with oxygen lance and add 36kg / (t Semi-steel) lime, 10kg / (t semi-steel) high-magnesium lime, and the initial slag formation time is 2.6min. After the molten steel temperature reaches 1680°C, the oxygen lance is raised and the blowing is stopped. The carbon content of molten steel is 0.34%, and the steel consumption per ton of steel is 1051kg.

example 3

[0027] In this example, the semi-steel is molten steel after vanadium-containing molten iron is blown by the vanadium extraction converter, and it contains 3.55% C and 0.02% Si by weight percentage, and the semi-steel temperature is 1385°C.

[0028] After mixing the semi-steel into the steel-making converter, add 20kg / (t semi-steel) of ferromanganese into the steel-making converter; then use the oxygen lance to blow oxygen for smelting and add 32kg / (t semi-steel) of lime and 13kg / ( t semi-steel) high-magnesium lime, the initial slag formation time is 3.1min, after the molten steel temperature reaches 1670℃, the oxygen lance is raised and the blowing is stopped. The carbon content of the molten steel is 0.29%, and the steel consumption per ton of steel is 1049kg.

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Abstract

The invention provides a method for enhancing end point carbon content in a converter and a semisteel steelmaking method. The method comprises the following steps: in the process of discharging semisteel into a ladle, adding 6.0-20.0kg / (t semisteel) manganese iron 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 catching carbon, supplementing oxygen blowing according to the carbon content to control the end point carbon content of the molten steel at 0.20-0.35%, and lifting the oxygen lance to stop blowing smelting, wherein the semisteel is molten steel prepared by carrying out vanadium extraction converter or dephosphorization converter blowing on vanadium-containing molten iron, and contains 3.2-3.8 wt% of C and 0.001-0.05 wt% of Si, and the temperature of the semisteel is 1320-1390 DEG C. 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 present invention belongs to the technical field of semi-steel steelmaking. Specifically, it relates to a method for increasing the final carbon content of a converter and a semi-steel steelmaking method adopting the method for increasing the final carbon content of the converter. Background technique [0002] Generally speaking, the vanadium-containing molten iron obtained from vanadium-containing iron ore (for example, vanadium-titanium magnetite) is smelted in a blast furnace to obtain semi-steel after smelting in a vanadium extraction converter or a dephosphorization converter. The semi-steel is characterized by low carbon (Average around 3.6%), low silicon (below 0.01%), low manganese (below 0.05%), insufficient heat source, low slag-forming element content, higher temperature than molten iron, low early oxidation of slag and difficulty in initial slag formation . When the semi-steel is used for smelting, since the heat-generating elements in the ...

Claims

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Application Information

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Patent Type & AuthorityPatents(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
OwnerPANGANG GROUP RESEARCH INSTITUTE CO LTD