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Vacuum treatment method of molten steel dephosphorus

A technology for vacuum treatment and molten steel, applied in the field of vacuum refining, can solve the problems such as difficulty in independent regulation of oxygen/powder material flow ratio, large loss of processing time or molten steel temperature, inability to use cheap bulk raw materials, etc. Wide range of addition rates and reduced phosphorus content

Inactive Publication Date: 2003-04-16
武钢集团有限公司
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  • Abstract
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Problems solved by technology

Since the powder and oxygen share a spray gun, there are the following disadvantages in deep dephosphorization of molten steel: at the same time, oxygen is used as the transport gas to spray powder to the molten pool in the vacuum chamber, and the material flow ratio of oxygen / powder is difficult to control independently; Before reaching the molten steel pool in the vacuum chamber, it is discharged by the vacuum pump, and the utilization rate of the powder is reduced; the dephosphorization rate during the powder spraying process is limited by the capacity of the powder spray tank, and the processing time or molten steel temperature is greatly lost; cheap block raw materials cannot be used, and the powder cost is high

Method used

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  • Vacuum treatment method of molten steel dephosphorus
  • Vacuum treatment method of molten steel dephosphorus
  • Vacuum treatment method of molten steel dephosphorus

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Embodiment 1

[0024] Example 1: In figure 1 On the shown RH vacuum degassing device, 4 furnaces of weakly deoxidized steel and 2 furnaces of aluminum and silicon killed steel were processed by the method of the present invention. Since the amount of flux added depends on the initial phosphorus and target phosphorus content and processing time of molten steel, therefore, The range of technical parameters such as oxygen and flux is given in the following process conditions:

[0025] Mass flux composition 60% active lime and 40% fluorite;

[0026] Powder composition 70% active lime and 30% fluorite;

[0027] Adding rate 100~120kg / min;

[0028] Oxygen injection volume per kg flux injection 0.06~0.260Nm 3 oxygen;

[0029] Addition amount of flux: 2~5kg flux per ton of molten steel;

[0030] Spray gun position 2-4m above the bottom of the vacuum chamber;

[0031] Ladle slag composition (mass%) (CaO / SiO 2 ) / Al 2 o 3 Greater than 0.2;

[0032] In ladle slag composition (mass%) CaF 2 The ...

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Abstract

A vacuum treatment method for dephosphorizing molten steel to produce low-phosphorus (or ultralow-phosphorus) weakly-deoxidized steel or other steel features that in the vacuum carbon-oxygen reactionphase, the oxygen or iron oxide needed by dephosphorizing reaction is added to the molten steel pool in a vacuum chamber while the lime blocks or powder is added for quickly dephosphorizing, and thismethod can also prevent rephosphorization from the steel ladle slag.

Description

technical field [0001] The invention relates to a vacuum treatment method for dephosphorization of molten steel, in particular to a method for removing phosphorus in molten steel by adding dephosphorization substances under vacuum decompression and degassing conditions, and belongs to the technical field of vacuum refining. Background technique [0002] The method of oxidative dephosphorization of molten steel is generally completed before the molten steel reaches vacuum degassing treatment. In the patent document International Publication Number: WO 00 / 68442.Method of decarburization and dephosphorization of a molten metal.16 November 2000, it is disclosed that "a Method for decarburization and dephosphorization of molten metal", in this method, in the vacuum degassing device, oxygen and powder are dephosphorized by spraying oxygen and powder to the surface of the molten steel in the vacuum degassing chamber by means of a spray gun installed on the top. Since the powder and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/10
Inventor 李凤喜彭玮珂区铁林利平田义胜曹维邵继新
Owner 武钢集团有限公司
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