Method for removing bubbles in No.45 steel

A technology of No. 45 steel and air bubbles, which is used in the improvement of process efficiency and the manufacture of converters, etc., can solve the problem of reusable cycle times to be considered, does not mention the removal of steel-slag interface pass performance, and does not provide refining slag In order to improve the bubble passing performance, avoid pore defects, and optimize the removal effect

Active Publication Date: 2020-12-18
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the passage performance of steel slag is poor, the air bubbles cannot pass through the steel-slag interface smoothly, and the air bubbles accumulate in the molten steel below the steel-slag interface, seriously affecting the product quality of steel
At the same time, the removal of inclusions is affected, and the adsorption of steel slag on inclusions will also be affected, which will seriously affect the performance of steel
[0003] Chinese patent document CN110218835A discloses a device and smelting method for removing inclusions under the steel-slag interface: implant or insert a solid medium below the steel core interface, and make the steel The non-metallic inclusions suspended in the water near the steel slag are adsorbed on the solid medium, and the removal of the solid medium can achieve the effect of removing the inclusions in the molten steel; the defect of this patent application is that whether the device can be reused and the number of times of recycling needs to be considered. According to the description of the invention, it mainly reduces the number of inclusions under the steel-slag interface, but there is no mention of the passing performance of the steel-slag interface and the removal of air bubbles
[0004] Chinese patent document CN107159858A discloses a method for removing inclusions in steel. Using the positively charged characteristics of aluminum oxide, it is proposed to use an adsorbent material with a negative charge on the surface to speed up the removal of inclusions, but it does not mention air bubbles. removal method
[0005] Chinese patent document CN108875285A discloses a design method of molten steel refining slag composition, establishes and solves the movement model of inclusions at the steel slag interface, and quantitatively evaluates the inclusion size, inclusion density, slag phase density, slag phase viscosity, molten steel density, and molten steel viscosity , The influence of the wettability of inclusions at the steel slag interface on the movement and removal process of inclusions at the steel slag interface, but did not give the specific composition of refining slag and the specific process flow

Method used

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  • Method for removing bubbles in No.45 steel
  • Method for removing bubbles in No.45 steel
  • Method for removing bubbles in No.45 steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] In the present embodiment, the chemical composition of the steel slag formed is: CaO: 50%, Al 2 o 3 : 29%, MgO: 6%, SiO 2 : 9%, CaF 2 : 5%, of which CaO / Al 2 o 3 ≈1.72, Al 2 o 3 / SiO 2 ≈3.2, alkalinity (CaO / SiO 2 )≈5.6, and the rest are unavoidable impurities contained in raw materials.

[0080] In this embodiment, the specific operation process is:

[0081] Oxygen blowing: In the process of converter steelmaking, the top-bottom combined blowing process is adopted to supply oxygen to the metal molten pool to remove excess impurities such as carbon, silicon, phosphorus, etc. in the carbon-saturated molten iron. Oxidation state, to obtain peroxidized molten steel.

[0082] Deoxidation: In this embodiment, a composite deoxidation method combining direct deoxidation and vacuum deoxidation is adopted. Specifically, the peroxidized molten steel is tapped from the converter into the ladle furnace and added to the peroxidized molten steel with a mass ratio of aluminu...

Embodiment 2

[0093] In this implementation, the chemical composition of the steel slag formed is: CaO: 50%, Al 2 o 3 : 28%, MgO: 6%, SiO 2 : 10%, CaF 2 : 5%, of which CaO / Al 2 o 3 ≈1.78, Al 2 o 3 / SiO 2 =2.8, alkalinity (CaO / SiO 2 )=5, and the remaining substances are unavoidable impurities contained in raw materials.

[0094] In this embodiment, the specific operation process is:

[0095] Oxygen blowing: In the process of converter steelmaking, the top-bottom combined blowing process is adopted to supply oxygen to the metal molten pool to remove excess impurities such as carbon, silicon, phosphorus, etc. in the carbon-saturated molten iron. Oxidation state, to obtain peroxidized molten steel.

[0096] Deoxidation: In this embodiment, a composite deoxidation method combining direct deoxidation and vacuum deoxidation is adopted. Specifically, the peroxidized molten steel is tapped from the converter into the ladle furnace and added to the peroxidized molten steel with a mass rati...

Embodiment 3

[0107] In the present embodiment, the chemical composition of the steel slag formed is: CaO: 50%, Al 2 o 3 : 29%, MgO: 5%, SiO 2 : 10%, CaF 2 : 5%, of which CaO / Al 2 o 3 ≈1.72, Al 2 o 3 / SiO 2 =2.9, alkalinity (CaO / SiO 2 )=5, and the remaining substances are unavoidable impurities contained in raw materials.

[0108] The specific operation process is:

[0109] Oxygen blowing: In the process of converter steelmaking, the top-bottom combined blowing process is adopted to supply oxygen to the metal molten pool to remove excess impurities such as carbon, silicon, phosphorus, etc. in the carbon-saturated molten iron. Oxidation state, to obtain peroxidized molten steel.

[0110] Deoxidation: In this embodiment, a composite deoxidation method combining direct deoxidation and vacuum deoxidation is adopted. Specifically, the peroxidized molten steel is tapped from the converter into the ladle furnace and added to the peroxidized molten steel with a mass ratio of aluminum-iro...

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Abstract

The invention relates to a method for removing bubbles in No.45 steel. The method comprises: an oxygen blowing process; a deoxidation process; and a slagging and bubble removing process. Slagging andbubble removal are that a slagging agent is added into a ladle furnace to form steel slag. The steel slag comprises the chemical components of 45-55% of CaO, 26-32% of Al2O3, 0-6% of MgO, 9-12% of SiO2, 3-5% of CaF2, and the balance of impurities, wherein CaO / Al2O3 is 1.68-1.79, Al2O3 / SiO2 is 2.8-3.3, and the alkalinity (CaO / SiO2) is 5-6. In the ladle furnace, argon is blown from the bottom, a vacuum condition is created above the steel slag, and the bubbles in the No.45 steel are removed. According to the method, the interfacial tension and viscosity of the steel slag are reduced, the passingefficiency of the bubbles and inclusions is improved, the removal effect of the inclusions is enhanced, and the quality level of steel products is improved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking technology, and in particular relates to a method for removing air bubbles in No. 45 steel. Background technique [0002] In the steelmaking process, the inert gas is blown at the bottom, and the bubbles float up and collide to realize the stirring of molten steel, thereby accelerating the aggregation and growth of inclusions. The removal process of inclusions is improved, and the dispersion of tiny air bubbles has a better effect of removing inclusions. Bubbles in steel are an important part of the process of removing inclusions in steelmaking, and the crossing behavior of bubbles at the steel-slag interface has always been the focus of many researchers. The performance of air bubbles passing through the steel-slag interface determines the ability of steel slag to absorb inclusions. If the passing performance of steel slag is poor, the air bubbles cannot pass through the steel-slag interfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/35C21C7/06C21C7/076C21C7/10
CPCC21C5/35C21C7/06C21C7/076C21C7/10Y02P10/20
Inventor 杨树峰宋朝琦刘威李京社赵梦静赵朋杨曙磊张福君
Owner UNIV OF SCI & TECH BEIJING
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