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Steel-making method of experimental induction furnace

An induction furnace, a technology used in experiments, applied in the field of steelmaking, to achieve the effect of eliminating the erosion of the furnace lining, flexible and effective operation, and eliminating pollution

Inactive Publication Date: 2012-01-18
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The document Pozzi, Marcello. Operating results of the EAF optimization system at Riva Verona. Metall Plant Technol Int.-60-69 discloses an EAF furnace steelmaking expert system, mainly involving carbon / oxygen, methane conversion, flue gas, electric power Adjustment, methane and carbon injection functions, the method and technical parameters are not seen. It involves the scheme of using top and bottom blowing to quickly decarburize and remove phosphorus and sulfur under induction conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 61Kg of solid metal material is loaded into the intermediate frequency induction furnace to smelt low-carbon and low-phosphorus steel, and the output power of the power supply during the smelting process is 30-45 kilowatts. Its experimental steelmaking steps:

[0035] 1) Power on to completely melt the solid metal material in the furnace;

[0036] 2) A water-cooled oxygen lance is used to blow oxygen from the top of the furnace into the furnace. During the blowing process, the position of the oxygen lance is fixed at 40% of the oxygen lance nozzle from the static depth of the molten steel, and the oxygen supply intensity is 3.1Nm per ton of steel. 3 / min, while blowing in nitrogen gas from the gas supply element at the bottom of the furnace to stir, the gas supply intensity is 0.05-0.10Nm per ton of steel 3 / min;

[0037] 3) Slagging: lime and dolomite are used, and the addition amount is lime 50kg / ton steel and dolomite 16kg / ton steel;

[0038] 4) When the top oxyge...

Embodiment 2

[0043] 60Kg of solid metal material is loaded into the intermediate frequency induction furnace to smelt low-carbon steel, and the output power of the power supply during the smelting process is 20-40 kilowatts. Its experimental steelmaking steps:

[0044] 1) Power on to completely melt the solid metal material in the furnace;

[0045]2) The water-cooled oxygen lance is used to blow oxygen from the furnace top to the furnace. The position of the oxygen lance is fixed at 45% of the oxygen lance nozzle from the resting depth of molten steel during the blowing process, and the oxygen supply intensity is 3.3m per ton of steel. 3 / min, while argon is blown into the gas supply element from the bottom of the furnace to stir, and the gas supply intensity is 0.08-0.15Nm per ton of steel 3 / min;

[0046] 3) Slagging: lime and dolomite are used, and the addition amount is lime 52kg / ton steel and dolomite 18kg / ton steel;

[0047] 4) When the top oxygen blowing time reaches 16 minutes, ...

Embodiment 3

[0052] 60Kg of solid metal material is loaded into the intermediate frequency induction furnace to smelt low-carbon and low-phosphorus steel, and the output power of the power supply during the smelting process is 30-45 kilowatts. Its experimental steelmaking steps:

[0053] 1) Power on to completely melt the solid metal material in the furnace;

[0054] 2) The water-cooled oxygen lance is used to spray oxygen from the furnace top into the furnace, and the operation of lowering the position of the oxygen lance during the blowing process is carried out in the following manner: 50% at the still depth of molten steel for 0.5min, and 50% at the still depth of molten steel for 5.5min 60%, 70% of the static depth of molten steel at the end of oxygen blowing; the oxygen supply intensity is 3.3Nm per ton of steel 3 / min;

[0055] 3) Slagging: Lime, dolomite and fluorite are used, and the addition amount is lime 53kg / ton steel, dolomite 18kg / ton steel, fluorite 4.5kg / ton steel;

[0...

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Abstract

The invention relates to a steel-making method of an experimental induction furnace, comprising the following steps of: electrifying and completely melting solid metal charge in a furnace; blowing oxygen into the furnace from a furnace top by adopting a fixed position manner or a gradual water-cooling oxygen lance position lowering manner; slagging; changing bottom blowing gas flow rate when top blowing oxygen is 15-16min; when mass percent of carbon in molten steel is less than 0.1%, stopping top oxygen supply; and removing slag in the furnace, then carrying out aluminium deoxidation, alloying and tapping according to type of steel which is made. The invention has the characteristics that: processing time is short, operation is flexible and effective; decarbonization, degasification, dephosphorization and sulphur impurity removal are carried out on molten metal in the induction furnace, molten iron can be rapidly smelted into steel, and great benefit is provided for expanding metallurgy function of the induction furnace and controlling variety, composition and product quality; good condition is provided for preferentially dephosphorizing during steelmaking, end phosphorous content is reduced to 0.010-0.0045wt%, environmental pollution and corrosion to lining of the induction furnace which are caused by solid cosolvent such as fluorite and the like can be eliminated.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a steelmaking method for an induction furnace with a basic lining. Background technique [0002] The intermediate frequency induction furnace is a common method used by many enterprises to melt and adjust the composition of solid metals. Universities and research institutions often use small intermediate frequency induction furnaces to conduct material development or basic technological tests. This method is affected by intermediate frequency induction furnace refractory materials. Due to the limitation of service life and smelting conditions, it is difficult to complete comprehensive refining such as decarburization, degassing, dephosphorization, and desulfurization in the same device. In the case where the composition of molten steel is higher than the specification requirement, the method of blending molten steel with different components is often used, or combined with ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52
Inventor 区铁朱万军田义胜曹同友杨成威孔勇江孙伟杨治争陈俊孚
Owner 武钢集团有限公司
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