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Smelting method of ultra-low oxygen pure steel

A technology of ultra-low oxygen pure steel and smelting method, applied in the field of smelting, can solve the problems of low purity, channel segregation, large size, etc., and achieve the effect of simple operation process, less quantity, and less inclusions

Active Publication Date: 2014-07-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for smelting ultra-low oxygen pure steel, which solves the current problems of large size and quantity of inclusions in steel ingots, castings and continuous casting slabs, low purity and serious channel segregation

Method used

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  • Smelting method of ultra-low oxygen pure steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Pouring 50kg steel ingot, the steel ingot material is H13 steel. Vacuum induction furnace is used to smelt and ordinary alloy materials, and the size is 30-60mm. The induction furnace adopts a calcium oxide crucible. After the molten metal is melted, the distance between the molten metal surface and the furnace mouth is 260mm. The vacuum degree of the induction furnace in the smelting process is required to be 10Pa. After the metal material is melted, the molten metal is boiled for 25 minutes at a vacuum of 30 Pa and the temperature is 1540°C. The purpose is to use the reaction of carbon and oxygen under vacuum to form CO to reduce the inclusions in the molten metal. Through the first vacuum carbon-oxygen reaction Reduce the oxygen content to 15ppm without adding any deoxidizing agent or deoxidizing alloy. After standing still for 25 minutes, the molten metal was boiled for another 15 minutes at a vacuum degree of 40 Pa, in order to reduce the content of inclusions and...

Embodiment 2

[0051] Pouring 25kg steel ingot, the steel ingot material is H13 steel. Vacuum induction furnace is used to smelt and ordinary alloy materials, and the size is 20-60mm. The induction furnace adopts a calcium oxide crucible. After the molten metal is melted, the distance between the molten metal surface and the furnace mouth is 270mm. The vacuum degree of the induction furnace in the smelting process is required to be 20Pa. After the metal material is melted, the molten metal is boiled for 20 minutes under a vacuum of 20 Pa, and the temperature is 1550°C. The purpose is to use the reaction of carbon and oxygen under vacuum to form CO to reduce the inclusions in the molten metal. Through the first vacuum carbon-oxygen reaction Reduce the oxygen content to 18ppm without adding any deoxidizing agent or deoxidizing alloy. After standing still for 30 minutes, the molten metal was boiled for another 20 minutes under a vacuum degree of 30 Pa. The purpose was to reduce the content of ...

Embodiment 3

[0053] Pouring 500kg steel ingot, the material of the steel ingot is No. 45 steel. Vacuum induction furnace is used to smelt and ordinary alloy materials, and the size is 40×60×300mm. The induction furnace adopts a magnesia crucible. After the molten metal is melted, the distance between the molten metal surface and the furnace mouth is 320mm, and the vacuum degree of the induction furnace in the smelting process is required to be 25Pa. After the metal material is melted, the molten metal is boiled for 30 minutes under a vacuum of 25 Pa, and the temperature is 1560°C. The purpose is to use the reaction of carbon and oxygen under vacuum to form CO to reduce the inclusions in the molten metal. Through the first vacuum carbon-oxygen reaction Reduce the oxygen content to 14ppm without adding any deoxidizing agent or deoxidizing alloy. After standing still for 20 minutes, the molten metal was boiled for another 20 minutes under a vacuum degree of 35 Pa, the purpose is to reduce th...

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Abstract

The invention relates to the field of smelting and specifically relates to a smelting method of ultra-low oxygen pure steel. A vacuum electric furnace or a vacuum induction furnace is adopted for smelting and vacuum pouring, and the vacuum degree is required to be 0.05-100Pa; after a metal charge is molten, a vacuum state is kept, molten metal is boiled for 5-30min, the oxygen content is reduced by vacuum carbon-oxygen reaction, and no deoxidizer or deoxidization alloy is added. The standing is performed for 20-30min after alloying, and the molten metal is boiled for 5-30min in the vacuum state. When the oxygen content is below 10ppm, 0.5-3kg / t of Si-Ca-Al-Mg-RE composite deoxidizer is added, the standing is performed for 1-10min after adding, then vacuum pouring is performed, and then the pure steel with the total oxygen content of below 4ppm can be obtained. The invention aims at solving the problems that existing steel ingots and cast blanks have more internal inclusions with relatively large sizes, the purity is not high and the channel segregation is serious. Simultaneously, by adopting a rare earth composite additive to perform modification treatment on the inclusions in the steel, the sizes of the inclusions are reduced, and the number of the inclusions in the steel is reduced, thus a new effective way is provided for pure smelting of molten steel.

Description

technical field [0001] The invention relates to the field of smelting, in particular to a smelting method of ultra-low oxygen pure steel, which adopts vacuum smelting and pouring, and adds rare earth composite additives to reduce the content of inclusions and oxygen in the steel. Background technique [0002] China is a big country with rare earth resources in the world. The reserves and output of rare earths far exceed those of other countries. How to make better use of them in steel has become a research hotspot. Rare earth has a good effect of purifying molten steel, reducing inclusions, and refining grains, thereby greatly improving the purity of molten steel. In recent years, with the rapid development of my country's electric power industry, nuclear industry and petrochemical industry, the demand for large castings is increasing, and the requirements for the purity of large castings are getting higher and higher. Large steel ingots and continuous casting slabs are the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/06C21C7/10
Inventor 傅排先刘宏伟李殿中高金柱康秀红侯成华
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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