Method for enhancing end point carbon content in smelting medium-carbon steel from semisteel and semisteel steelmaking method

A carbon content at the end point and steel smelting technology, which is applied in the field of semi-steel and steelmaking, can solve the problem of low carbon content at the end point, achieve the effects of increasing the carbon content at the end point, controlling the consumption of steel materials, and increasing the speed of slag making in steelmaking

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 low carbon content at the end point when semi-steel smelting medium-carbon steel in steelworks, and provide a method for increasing the carbon content at the end point when semi-steel smelting medium-carbon steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021]In this example, the semi-steel is the molten steel after the vanadium-containing molten iron has been blown by the vanadium-extracting converter, and it contains 3.52% C and 0.01% Si by weight percentage, and the temperature of the semi-steel is 1380°C.

[0022] In the process of discharging semi-steel into the ladle, 3kg / (t semi-steel) of ferrosilicon is added to the ladle; 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 refining. The carbon content of the obtained molten steel is 0.21%, 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 has been blown by the vanadium-extracting converter, and it contains 3.47% C and 0.01% Si by weight percentage, and the temperature of the semi-steel is 1325°C.

[0025] In the process of discharging semi-steel into the ladle, 8kg / (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 2.2min, and when the temperature of molten steel reaches 1680°C, the oxygen lance is raised to stop blowing. The carbon content of the obtained molten steel is 0.29%, and the steel material consumption per ton of steel is 1050kg.

example 3

[0027] In this example, the semi-steel is the molten steel after the vanadium-containing molten iron has been blown by the vanadium-extracting converter, and it contains 3.55% C and 0.02% Si by weight percentage, and the temperature of the semi-steel is 1375°C.

[0028] After the semi-steel is blended into the steel-making converter, 3kg / (t semi-steel) of ferrosilicon is added to the steel-making converter; t semi-steel) high magnesium lime, the initial slag formation time is 3.1min, 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 0.26%, and the steel material consumption per ton of steel is 1049kg.

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Abstract

The invention provides a method for enhancing end point carbon content in smelting medium-carbon steel from semisteel and a semisteel steelmaking method. The method comprises the following steps: in the process of discharging semisteel into a ladle, adding 3-8kg / (t semisteel) silicon iron into the ladle; adding semisteel into the 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 0.20-0.30%, 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 3.20-3.80 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 invention belongs to the technical field of semi-steel steelmaking, and specifically relates to a method for increasing the carbon content at the end point of semi-steel smelting medium-carbon steel and a semi-steel smelting method using the method for increasing the carbon content at the end point of semi-steel smelting medium-carbon steel steel 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...

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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