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Top-bottom combined blowing converter technology for high-carbon low-phosphor molten steel with single-slag process

A technology of top-bottom blowing and converter, applied in the direction of manufacturing converters, can solve the problems of complex process, affecting production rhythm, etc., and achieve the effect of stable carbon-oxygen reaction

Active Publication Date: 2011-11-02
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process adopts the double slag method, so the process is complicated and affects the production rhythm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add 90t of medium-phosphorus molten iron, 3t of steel scrap and 1t of iron into an 80t top-bottom reblown converter, wherein the medium-phosphorus molten iron contains 4.0% of C, 0.51% of Si, 0.25% of Mn, 0.168% of P, 0.045% S, the balance is Fe and unavoidable impurities, and the temperature of molten iron is 1246°C. When blowing starts, use the gun position of 1400mm, lower the gun position to 1300mm in about 3 minutes, raise the gun position to 1600mm in about 6 minutes, raise the gun position to 1900mm in about 8 minutes, and then make the gun position between 1700mm~1900mm Alternately change up and down, until 12 and a half minutes, start to press the gun, and slowly press the gun to 1300mm. When blowing is started, an oxygen pressure of 0.80 MPa is used, the oxygen pressure is reduced to 0.70 MPa in about 3 minutes, and the oxygen pressure is maintained at 0.85 MPa after about 4.5 minutes. After blowing starts, add 4000kg of active lime, 400kg of light burnt magn...

Embodiment 2

[0039] Add 89t of medium-phosphorus molten iron and 4.5t of steel scrap into the 80t top-bottom combined blowing converter, wherein the medium-phosphorus molten iron contains 4.0% C, 0.38% Si, 0.20% Mn, 0.177% P, 0.040% by weight % S, the balance is Fe and unavoidable impurities, and the temperature of molten iron is 1238°C. When blowing, use the gun position of 1500mm, after about 3.5 minutes, lower the gun position to 1400mm, after about 6 minutes, raise the gun position to 1700mm, after about 8 minutes, raise the gun position to 1800mm, and then make the gun position at 1700mm Alternate up and down between ~1900mm, until 12 and a half minutes, start to press the gun, and slowly press the gun to 1300mm. When blowing is started, an oxygen pressure of 0.80 MPa is used, the oxygen pressure is reduced to 0.70 MPa in about 3 minutes, and the oxygen pressure is maintained at 0.85 MPa after about 5 minutes. After blowing starts, add 3500kg active lime, 450kg light burnt magnesia b...

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Abstract

The invention discloses a top-bottom combined blowing converter technology for high-carbon low-phosphor molten steel with a single-slag process. The top-bottom combined blowing converter technology for high-carbon low-phosphor molten steel with the single-slag process is characterized in that: the technology comprises preliminary blowing, interim blowing and post blowing; raw materials comprise middle phosphor molten iron; and in post blowing, the content of FeO in furnace lag is controlled in a range of 15% to 20% through employing continuously changed dynamic oxygen lance position on a high lance position, an oxygen supply intensity of 2.5 to 3.5 Nm<3> / t*min, an oxygen pressure of 0.8 to 0.85 Mpa. According to the top-bottom combined blowing converter technology for high-carbon low-phosphor molten steel with the single-slag process, high-carbon low-phosphor molten steel production with the single-slag process is realized by controlling the content of FeO in the furnace lag in the range of 15% to 20% through employing continuously changed dynamic oxygen lance position on the high lance position.

Description

technical field [0001] The invention relates to a steelmaking process, in particular to a top-bottom combined blowing converter process for producing high-carbon and low-phosphorus molten steel. Background technique [0002] The production of high-carbon and low-phosphorus molten steel by converter generally includes low-drawing carbon supplementation process and high-carbon tapping process. In the low-draw carbon replenishment process, a carburant is added to the molten steel after the low-carbon steel is tapped, thereby increasing the carbon content in the molten steel. The low-drawing carbon replenishment process can ensure a low phosphorus content of molten steel, a suitable end temperature and a relatively stable carbon content, and its process is stable, so it is adopted by most steel mills. However, when adding a recarburizer after tapping, the process needs to use argon for stirring to evenly mix the molten steel composition, which will cause the molten steel to be ...

Claims

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Application Information

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IPC IPC(8): C21C5/35
Inventor 陈良王显军尹崇丽魏潇黄优明
Owner SHANDONG IRON & STEEL CO LTD
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