Semisteel steelmaking method

A technology of molten steel and ladle, applied in the manufacture of converters, etc., which can solve the problems of low yield of recarburizer, instability, and low tapping temperature

Inactive Publication Date: 2011-09-28
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method that can solve the problem of low tapping temperature when the carbon content of the end point molten steel is high during semi-steel smelting, and / or the low and / or unstable yield of the recarburizer in the tapping process due to the low carbon content of the end point molten steel. Problems with semi-steelmaking methods

Method used

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Examples

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Effect test

example 1

[0052] Use semi-steel after desulfurization and vanadium extraction as raw material to smelt No. 45 high-quality carbon structural steel. The main components of the semi-steel used in Example 1 are shown in Table 1.

[0053] Blowing with a 120t compound blowing converter, after the semi-steel is mixed into the converter, the oxygen lance is lowered to start blowing oxygen, the oxygen blowing pressure is 0.9Mpa, and the oxygen supply intensity is 3.6m 3 / t 钢 .min; while starting to blow oxygen, add slagging material active lime, the above-mentioned composite slagging agent and high-magnesium lime into the furnace, and add all the slagging materials within 3 minutes of starting the blowing and oxygen supply, and the slagging material activity The addition amount of lime, composite slagging agent and high magnesium lime is 28Kg / t respectively 半钢 、21Kg / t 半钢 and 15Kg / t 半钢 , when the oxygen supply time was 848 seconds, the oxygen lance was raised to stop the oxygen supply, and t...

example 2

[0060] Use semi-steel after desulfurization and vanadium extraction as raw material to smelt B (PSL1) steel. The main components of semi-steel are shown in Table 3.

[0061] Blowing with a 120t re-blowing converter, after the semi-steel is mixed into the converter, the oxygen lance is lowered to start blowing oxygen, the oxygen blowing pressure is 0.9Mpa, and the oxygen supply intensity is 3.65m 3 / t 钢 .min; while starting to blow oxygen, add slagging material active lime, the above-mentioned composite slagging agent and high-magnesium lime into the furnace, and add all the slagging materials within 3 minutes of starting the blowing and oxygen supply, and the slagging material activity The addition amount of lime, composite slagging agent and high magnesium lime is 30Kg / t respectively 半钢 、23Kg / t 半钢 and 14Kg / t 半钢 , when the oxygen supply time was 825 seconds, the oxygen lance was lifted to stop the oxygen supply, and the molten steel with a temperature of 1701°C was obtaine...

example 3

[0068] Use semi-steel after desulfurization and vanadium extraction as raw material to smelt HRB400. The main components of semi-steel are shown in Table 5.

[0069] Blowing with 120t re-blowing converter, after the semi-steel is mixed into the converter, the oxygen lance is lowered to start blowing oxygen, the oxygen blowing pressure is 0.9Mpa, and the oxygen supply intensity is 3.62m 3 / t 钢 .min; while starting to blow oxygen, add slagging material active lime, the above-mentioned composite slagging agent and high-magnesium lime into the furnace, and add all the slagging materials within 3 minutes of starting the blowing and oxygen supply, and the slagging material activity The addition amount of lime, composite slagging agent and high magnesium lime is 27.5Kg / t respectively 半钢 、18.9Kg / t 半钢 and 14.2Kg / t 半钢 , when the oxygen supply time was 795 seconds, the oxygen lance was lifted to stop the oxygen supply, and the molten steel with a temperature of 1689°C was obtained, a...

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Abstract

The invention provides a semisteel steelmaking method, which comprises: blowing semisteel in a converter; adding a slag former; controlling the terminal of converter blowing; tapping; and stirring molten stirring at an argon flushing station. In the control of the terminal of converter blowing, the carbon content in the molten steel is kept between 0.04 and 0.10 weight percent; and carbon is added into a ladle in a tapping process. When the semisteel steelmaking method provided by the invention is used, the problem that the terminal carbon content in molten steel is high while the tapping temperature is low during semisteel smelting, and the problem that the terminal carbon content in molten steel is low while the carburant yield in the tapping process is low and / or instable are solved.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a semi-steel making method. Background technique [0002] At present, the use of vanadium-extracting semi-steel converter steelmaking is a relatively mature process, which mainly includes steps such as converter smelting, ladle refining, argon blowing station refining and continuous casting. Using semi-steel steelmaking after vanadium extraction by converter, since the mass percentage of carbon in semi-steel obtained after desulfurization and vanadium-containing molten iron is 3.4% to 4.0%, the content of silicon and manganese in semi-steel generates heat and slag Therefore, semi-steel steelmaking has the disadvantages of less acidic slag-forming substances, single slag system components, and insufficient heat in the blowing process, which makes semi-steel steelmaking more difficult than molten iron steelmaking. [0003] The journal document "Smelting and Development of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30C21C5/36C21C7/00B22D11/115
Inventor 陈均陈天明杨森祥曾建华梁新腾陈永李青春
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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