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A kind of oxide control method for improving magnesium yield

A control method and yield technology, which is applied to adding titanium and magnesium in steelmaking, can solve the problems of cumbersome operation process and high cost, and achieve the effect of reducing alloy cost and improving alloy utilization rate.

Active Publication Date: 2017-12-26
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operation process of this method is cumbersome, the cost is high, and the operation process of adding alloy is not given in detail

Method used

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  • A kind of oxide control method for improving magnesium yield
  • A kind of oxide control method for improving magnesium yield

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Experimental program
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Effect test

Embodiment 1

[0025] When the LF refining station taps the steel, the oxygen content of the molten steel is 21ppm. After the molten steel is vacuum degassed and alloyed at the RH station, the net circulation is 5 minutes. The superheat of the molten steel is 72°C after the vacuum is broken, and the Ti-Fe alloy cored wire is fed at a speed of 5m / s. The Ti alloy in the core powder The content is 25%; the bottom blowing pressure of 0.6MPa is softly stirred for 6 minutes, and before the ladle is hoisted away from the RH station, ultra-low carbon carbonized rice husk is added to the liquid surface to keep it warm. Entering the continuous casting station, the superheated degree of molten steel is 28°C, the content of free oxygen is 10ppm, and 425m of Ni-Mg alloy cored wire is fed at a speed of 7m / s, and the particle size of the cored wire core powder is 0.5-2.0mm. The alloy core powder contains 2-18% Mg by weight, and is softly stirred at a pressure of 0.4 MPa for 3 minutes, and then the ladle is...

Embodiment 2

[0027] When the steel is tapped at the LF refining station, the oxygen content of the molten steel is 26ppm. After the molten steel is vacuum degassed and alloyed at the RH station, the net circulation is 7 minutes. After the vacuum is broken, the superheat of the molten steel is 68 ° C. The Ti-Fe alloy cored wire is fed at a speed of 5 m / s. The Ti alloy in the core powder The content is 25%; the bottom blowing pressure of 0.5MPa is softly stirred for 7 minutes, and before the ladle is hoisted away from the RH station, ultra-low carbon carbonized rice husk is added to the liquid surface to keep it warm. Entering the continuous casting station, the superheated degree of molten steel is 26°C, the free oxygen content is 17ppm, and 409m of Ni-Mg alloy cored wire is fed at a speed of 9m / s, and the particle size of the cored wire core powder is 0.5-2.0mm. The alloy core powder contains 2-18% Mg by weight, and is softly stirred at a pressure of 0.4 MPa for 3 minutes, and then the lad...

Embodiment 3

[0029] When the steel is tapped at the LF refining station, the oxygen content of the molten steel is 29ppm. After the molten steel is vacuum degassed and alloyed at the RH station, the net circulation is 8 minutes. The superheat of the molten steel is 57°C after the vacuum is broken, and the Ti-Fe alloy cored wire is fed at a speed of 5m / s. The Ti alloy in the core powder The content is 25%; the bottom blowing pressure of 0.4MPa is softly stirred for 9 minutes, and before the ladle is hoisted away from the RH station, ultra-low carbon carbonized rice husk is added to the liquid surface to keep it warm. Entering the continuous casting station, the superheated degree of molten steel is 21°C, the free oxygen content is 20ppm, and 412m of Ni-Mg alloy cored wire is fed at a speed of 10m / s, and the particle size of the cored wire core powder is 0.5-2.0mm. The alloy core powder contains 2-18% Mg by weight, and is softly stirred at a pressure of 0.4 MPa for 3 minutes, and then the la...

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Abstract

The invention discloses an oxide control method for increasing magnesium yield, and belongs to the technical field of steel smelting. In the method, a Ti-Fe alloy core-spun yarn is fed in a steel ladle on a RH station, and an alloy element Ti is added; after the steel ladle is lifted to a revolving table, the content of free oxygen in molten steel is controlled in a range of 10-18 ppm; the superheating degree of the molten steel is 20-30 DEG C; a Ni-Mg alloy core-spun yarn is fed in the steel ladle on a continuous casting station, and an alloy element Mg is added; and the soft stirring is performed by 3 min under the pressure of 0.4 MPa. The method can stabilize the yield of the alloy element Mg within 15-30%; oxides in a prepared slab mainly adopt Mg-Ti serial composite oxides; the oxides with sizes of not more than 2.0 microns are 83% or more of the oxides; and the volume density of the oxides with sizes of not more than 2.0 microns reaches 3.7*105 p / mm3 and more.

Description

technical field [0001] The invention belongs to the technical field of steelmaking production, and in particular relates to an oxide control method for adding titanium and magnesium during steelmaking to increase the yield of magnesium. Background technique [0002] At present, steel plates for high heat input welding have been widely used in many fields such as ships, buildings, pressure vessels, pipelines, and offshore platforms. According to estimates, using the high heat input welding method can even increase the welding efficiency by 5 times or more, greatly reduce the manufacturing hours, and greatly reduce the cost. [0003] Oxide metallurgy technology is an effective method for manufacturing large heat input welded steel plates. This method mainly requires oxides to be kept below a certain size, and fine oxides are used to induce intragranular acicular ferrite nucleation and indirectly refine the original austenite grains. Grain size, so as to obtain high low temper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/10C21C7/072B22D1/00B22D11/116
CPCB22D1/00B22D11/116C21C7/0056C21C7/06C21C7/072C21C7/10
Inventor 周云张宇李小宝
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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