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Efficient decarburization method for RH refining furnace

A refining furnace and high-efficiency technology, applied in the field of iron and steel metallurgy, can solve problems such as the inability to smelt ultra-low carbon steel quickly, and achieve the effects of shortening the vacuum treatment time, increasing the generation of inclusions, and avoiding secondary oxidation on the surface

Pending Publication Date: 2021-09-24
BAOTOU IRON & STEEL GRP
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  • 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 high-efficiency decarburization of RH refining furnaces, which overcomes the disadvantage that the existing smelting process cannot quickly smelt ultra-low carbon steel with a carbon content of less than 0.002%. Good effect on oxidation

Method used

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  • Efficient decarburization method for RH refining furnace

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Effect test

Embodiment 1

[0032] Ultra-low carbon steel is smelted from molten steel with a carbon content of 0.041%. The in-place temperature of the RH furnace is 1605°C, and the oxygen is 475ppm. Apply the "three-stage" circulation control method, specifically the pressure drop period of 120Nm 3 / h, decarburization period 180Nm 3 / h, pure degassing period 150Nm 3 / h, the minimum vacuum degree is 1.5mbar, the decarburization period is 12min, and the carbon end point is 18ppm.

Embodiment 2

[0034] Ultra-low carbon steel is smelted with molten steel with a carbon content of 0.038% as raw material. The in-place temperature of the RH furnace is 1609°C, and the oxygen is 499ppm. Apply the "three-stage" circulation control method, specifically the pressure drop period of 120Nm 3 / h, decarburization period 180Nm 3 / h, pure degassing period 150Nm 3 / h, the minimum vacuum degree is 1.5mbar, the decarburization period is 14min, and the end carbon is 19ppm.

Embodiment 3

[0036] Ultra-low carbon steel is smelted with molten steel with a carbon content of 0.040% as raw material. The in-place temperature of the RH furnace is 1612°C, and the oxygen is 460ppm. Apply the "three-stage" circulation control method, specifically the pressure drop period of 120Nm 3 / h, decarburization period 180Nm 3 / h, pure degassing period 150Nm 3 / h, the minimum vacuum degree is 1.5mbar, the decarburization period is 14min, and the end carbon is 19ppm.

[0037] Table 1 below shows the relevant decarbonization effect data for the three cases.

[0038] Table 1

[0039]

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Abstract

The invention discloses an efficient decarburization method for an RH refining furnace. The purpose of fast decarburization of molten steel is achieved by adjusting circulation gas flow in different periods of vacuum smelting of the RH refining furnace and accelerating carbon-oxygen reaction rate in a deep vacuum environment, and meanwhile, inclusion of IF steel is controlled at a lower level.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for efficient decarburization of an RH refining furnace, which can decarbonize to less than 0.002% and reduce the content of inclusions in steel. Background technique [0002] Carbon in steel is the most common strengthening element, which increases the hardness and strength of steel and reduces plasticity. The performance requirements of ultra-deep drawing ultra-low carbon steel require lower yield strength and higher elongation, so it is necessary to reduce the carbon content in the steel as much as possible. If there is a large amount of carbon in the steel, a corresponding amount of carbon must be added Carbonitride elements to fix interstitial atoms, such as Nb, Ti, etc. This practice will lead to increased production costs, and will also produce a large number of carbides, nitrides, etc., which will eventually increase the strength and hardness of the prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/068
CPCC21C7/10C21C7/068
Inventor 徐少华李志成王与帅韩浩田王俊刚张卫东王进财徐涛
Owner BAOTOU IRON & STEEL GRP
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