Semisteel steelmaking temperature control method and semisteel steelmaking method

A temperature control method and steelmaking converter technology, which is applied in the field of semi-steel and steelmaking, can solve the problems of physical temperature difference in semi-steel and steelmaking, to control the consumption of steel materials, increase the speed of slag making in steelmaking, and shorten the initial slag formation time Effect

Active Publication Date: 2015-07-08
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 that the physical temperature of semi-steel steelmaking in steelworks is relatively poor, and a method for controlling the temperature of semi-steel steelmaking is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] 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.

[0023] 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

[0025] 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.

[0026] 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

[0028] 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.

[0029] 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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Abstract

The invention provides a semisteel steelmaking temperature control method and a semisteel steelmaking method. The method comprises the following steps: in the process of discharging semisteel into a ladle, adding 1.5-6.0kg / (t semisteel) silicon iron into the ladle, 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; and adding the semisteel into the steelmaking furnace, lowering an oxygen lance to perform oxygen blowing smelting while adding related slagging materials and alloys according to the blowing smelting requirements. 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 field of semi-steel steelmaking technology, and specifically relates to a semi-steel steelmaking temperature control method and a semi-steel steelmaking method using the semi-steel steelmaking temperature 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...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C21C7/072C21C7/076
CPCY02P10/20
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