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Refining vessel for high temperature melt

A high-temperature melting and container technology, applied in the manufacture of converters, furnaces, charge manipulation, etc., can solve problems such as poor effects and achieve high cracks.

Pending Publication Date: 2021-11-16
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these techniques are poorly effective and cannot be effective countermeasures

Method used

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  • Refining vessel for high temperature melt
  • Refining vessel for high temperature melt
  • Refining vessel for high temperature melt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0083] According to the conditions shown in Table 1 to Table 4, the following figure 1 The gas blowing nozzle refractory in which 81 thin metal tubes are arranged concentrically is shown.

[0084] In the top view of the refractory 10 for gas injection nozzles, the radius R of the imaginary circle with the smallest radius including all the buried metal thin tubes 20 is 50mm, and the radius R+r of the central refractory is set at r=8~ 200mm range change.

[0085] As the thin metal tube 20 embedded in the carbon-containing refractory, a thin metal tube with an outer diameter of 3.5 mm and an inner diameter of 2.0 mm made of ordinary steel or stainless steel (SUS304) was used.

[0086] The respective refractory raw materials were mixed in the ratios shown in Tables 1 to 4, and kneaded with a mixer. The thin metal tube 20 is placed in the kneaded product for the center refractory 12 and molded into the center refractory 12 by uniaxial pressing. Further, the kneaded material for ...

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PUM

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Abstract

Provided is a refining vessel for a high temperature melt wherein a gas blowing nozzle is highly durable. The refining vessel for a high temperature melt is configured such that: the refractory material for the gas blowing nozzle comprises a central refractory in which metal tubules are embedded and an outer refractory surrounding the circumference of said central refractory; when the minimum radius of an imaginary circle that encompasses all of the embedded metal tubules in a plane surface of the refractory material for the gas blowing nozzle is R (mm), the external form of the central refractory has a shape encompassed between a circle that is concentric with the imaginary circle and has a radius of R+10 mm and a circle that is concentric with the imaginary circle and has a radius of R+150 mm; the central refractory is composed of a MgO-C refractory with a 30-80 mass% carbon content; and the outer refractory is composed of a MgO-C refractory with a 10-25 mass% carbon content.

Description

technical field [0001] The present invention relates to a container for refining a high-temperature molten material such as a converter or an electric furnace, and the container for the high-temperature molten material is provided with gas injection nozzles on the bottom of the furnace or the like. Background technique [0002] In converters, electric furnaces, etc., in order to improve refining efficiency and alloy yield, stirring gas (usually inert gas such as nitrogen and Ar) and refining gas are blown into molten metal from the bottom of the furnace, that is, so-called bottom blowing. As the system of the bottom blowing, there are the following methods (1) to (3) and the like. [0003] (1) A double-pipe system in which oxygen for decarburization is blown from the inner pipe and hydrocarbon gas (propane, etc.) is blown from the outer pipe to cool the molten steel contact part. [0004] (2) A method in which a slit-like opening is provided in the gap between the metal pip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/48F27D3/16
CPCC21C5/48F27D3/16F27B3/22F27D2003/167F27D2027/002F27D1/0006F27D2003/164F27D2003/165
Inventor 细原圣司鸟越淳志藤吉亮磨
Owner JFE STEEL CORP