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Method for producing low-carbon steel by adopting high-decarburization-rate VD refining decarburization process

A technology of high decarburization rate, low carbon steel, applied in the field of steelmaking, can solve the problem of not producing ultra-low carbon steel, etc., and achieve the effect of high decarburization rate

Active Publication Date: 2021-06-25
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Comparative document 2: The patent application with publication number CN110106441 discloses a process method for smelting high-purity steel using VD vacuum treatment equipment, but this method is only suitable for the production of steel grades with a carbon content of 0.15% to 1.05%, and also does not have Capability of producing ultra-low carbon steel

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  • Method for producing low-carbon steel by adopting high-decarburization-rate VD refining decarburization process
  • Method for producing low-carbon steel by adopting high-decarburization-rate VD refining decarburization process

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Embodiment 1

[0064] The production process of steel H180YD for automobile plates is: converter→VD refining, the ladle capacity is 200t, and the technical parameters controlled in the process are as follows:

[0065] S1. Smelting molten iron to obtain molten steel;

[0066] S2. Tapping the smelted molten steel to obtain tapping molten steel; in the tapping process, adopting double blowing converter for smelting, and the carbon content of tapping is 0.045%;

[0067] The tapping molten steel is pre-refined to obtain a pre-refined molten steel; wherein, 1 ton of lime and 220 kg of fluorite are added to the pre-refining, the active oxygen in the molten steel is controlled to 0.05wt%, and VD refining starts The amount of aluminum particles added to the front slag surface is 20kg;

[0068] S3. Perform VD refining on the pre-refined molten steel to obtain low-carbon refined molten steel; wherein, at the beginning of the VD refining, control the ratio of C to O in the pre-refined molten steel: W[C...

Embodiment 2

[0077] The process route for the production of DC04 steel for automobile plates is: converter→VD refining, the ladle capacity is 300t, and the technical parameters controlled in the process are as follows:

[0078] S1. Smelting molten iron to obtain molten steel;

[0079] S2. Tapping the smelted molten steel to obtain tapping molten steel; in the tapping process, adopting double blowing converter for smelting, and the carbon content of tapping is 0.052%;

[0080] S3. Pre-refining the tapping molten steel to obtain pre-refined molten steel; wherein, 1.5 tons of lime and 350 kg of fluorite are added to the pre-refining, and the active oxygen in molten steel is controlled to 0.056wt%, VD Add 30kg of aluminum particles to the slag surface before refining starts;

[0081] S4. Perform VD refining on the pre-refined molten steel to obtain low-carbon refined molten steel; wherein, at the beginning of the VD refining, control the ratio of C to O in the pre-refined molten steel: W[C] / ...

Embodiment 3

[0090] The production process of steel DX56D for automobile plates is: electric furnace→VD refining, the ladle capacity is 100t, and the technical parameters controlled in the process are as follows:

[0091]S1. The molten iron is smelted in a 100t electric furnace to obtain molten steel;

[0092] S2. Tapping the smelting molten steel to obtain tapping molten steel, the carbon content of which is 0.06%,

[0093] S3. Pre-refining the tapping molten steel to obtain pre-refined molten steel; wherein, adding 400Kg of lime and 100kg of fluorite to the pre-refining for tapping pre-refining. Oxygen is controlled at 0.055wt%, and 10kg of aluminum particles are added to the slag surface before VD refining begins;

[0094] S4. Perform VD refining on the pre-refined molten steel to obtain low-carbon refined molten steel; wherein, at the beginning of the VD refining, control the ratio of C to O in the pre-refined molten steel: W[C] / The W[O] ratio was 0.8, the W[C] was 0.042 wt%, and th...

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Abstract

The embodiment of the invention discloses a method for producing low-carbon steel by adopting a high-decarburization-rate VD refining decarburization process. The method comprises the following steps: smelting molten iron, and then tapping to obtain tapping molten steel; performing pre-refining on the tapping molten steel to obtain pre-refined molten steel; adding lime and fluorite in the pre-refining process so as to control the oxygen content in the pre-refined molten steel to be 0.045 wt%-0.060 wt%; and performing VD refining on the pre-refined molten steel to obtain low-carbon refined molten steel, wherein the ratio of C to O in the pre-refined molten steel is controlled to be W[C] / W[O]=0.5-0.8, and W[O] is 0.05 wt%-0.06 wt%. Argon bottom blowing and vacuumizing treatment are carried out during VD refining, the vacuum degree is measured, the flow of argon bottom blowing is adjusted to be 0.25-1.5 Nl / min / ton steel according to the vacuum degree, and the time is adjusted to be 20 s to 10 min. According to the embodiment of the invention, rapid and high-decarburization-rate decarburization is realized.

Description

technical field [0001] The embodiment of the present invention relates to the technical field of steelmaking, in particular to a method for producing low-carbon steel by adopting a high decarburization rate VD refining decarburization process. Background technique [0002] In recent years, vacuum refining is a refining method commonly used in steel production, and has become an indispensable part of the high-quality steel production process route. Among the refining equipment with vacuum treatment function, VD and RH devices are most widely used. The main metallurgical function of RH is decarburization and degassing, and it is currently the main means of producing ultra-low carbon or ultra-low carbon steel at home and abroad. VD is mostly used for the degassing of molten steel and other purposes, and theoretically speaking, the VD treatment process also has good decarburization kinetics conditions. The development of VD decarburization process can not only expand the produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/068C21C7/00
CPCC21C7/10C21C7/068C21C7/0006
Inventor 初仁生刘金刚朱志远季晨曦李海波王国连高宠光闫占辉胡显堂杨荣光李战军郝宁李广双
Owner SHOUGANG CORPORATION