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

A low-carbon steel and decarburization technology, applied in the field of steelmaking, can solve problems such as long time, cumbersome operation steps, and long VD refining time, and achieve the effect of stable production and rapid decarburization production

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

[0003] Comparative document 1: The patent application with the publication number CN105986063A discloses a method for producing cold-rolled plate SPHD with VD. The method uses LF refining process twice to operate, and the operation steps are cumbersome, and the VD refining time is longer (holding pressure) Time 19~21min)
Comparative document 2: The patent application with publication number CN110106441A discloses a process method for smelting high-purity steel using VD vacuum treatment equipment. The VD treatment time of this method is too long (20-35min), and the C content is as high as 0.015wt %

Method used

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

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Effect test

Embodiment 1

[0063] The process route for the production of DC04 steel for automobile plates is: molten iron pretreatment→converter→VD refining, the ladle capacity is 200t, and the technical parameters controlled in the process are as follows:

[0064] S1. Smelting molten iron to obtain smelting molten steel; the carbon and oxygen product at the end of smelting is controlled to 0.0023%;

[0065] S2. Tapping the smelting molten steel to obtain tapping molten steel; wherein, bottom blowing argon gas and strong stirring are performed in the tapping process, and the carbon content of the tapping molten steel is 0.035wt%;

[0066] S3. Pre-refining the tapping molten steel to obtain pre-refining molten steel; wherein, in the pre-refining, add 800kg of lime and 100kg of fluorite for tapping pre-refining; the oxygen content in the molten steel before VD refining Controlled to 0.030wt%;

[0067] S4. Perform VD refining on the pre-refined molten steel to obtain low-carbon refined molten steel; wher...

Embodiment 2

[0075] The production process of steel DC06 for automobile plates is as follows: molten iron pretreatment→converter→VD refining, the ladle capacity is 150t, and the technical parameters controlled in the process are as follows:

[0076] S1. Smelting molten iron to obtain smelting molten steel; the carbon and oxygen product at the end of smelting is controlled to 0.0020%;

[0077] S2. Tapping the smelting molten steel to obtain tapping molten steel; wherein, bottom blowing argon and strong stirring are performed in the tapping process, and the carbon content of the tapping molten steel is 0.045wt%;

[0078] S3. Pre-refining the tapping molten steel to obtain pre-refining molten steel; wherein, in the pre-refining, add 600kg of lime and 70kg of fluorite for tapping pre-refining, the oxygen content in the molten steel before VD refining Controlled to 0.035wt%;

[0079] S4. Perform VD refining on the pre-refined molten steel to obtain low-carbon refined molten steel; wherein, the...

Embodiment 3

[0087] The production of steel DX52D for automobile plates, the process route is: electric furnace→VD refining, the ladle capacity is 100t, the technical parameters controlled in the process are as follows:

[0088] S1. Smelting molten iron to obtain smelting molten steel; the carbon and oxygen product at the end of smelting is controlled to 0.0025%;

[0089] S2. Tapping the smelting molten steel to obtain tapping molten steel; wherein, bottom blowing argon and strong stirring are carried out in the tapping process, and the carbon content of the tapping molten steel is that the tapping carbon content is 0.015wt%,

[0090] S3. Pre-refining the tapping molten steel to obtain pre-refining molten steel; wherein, in the pre-refining, add 400kg of lime and 50kg of fluorite for tapping pre-refining; the oxygen content in the molten steel before VD refining Controlled to 0.040wt%;

[0091] S4. Perform VD refining on the pre-refined molten steel to obtain low-carbon refined molten st...

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Abstract

The invention discloses a method for producing low-carbon steel by adopting a VD refining light decarburization process. The method comprises the following steps of smelting molten iron, and then tapping to obtain tapped molten steel, wherein argon bottom blowing and strong stirring treatment are carried out in the tapping process, and the carbon content of the tapped molten steel ranges from 0.015% to 0.045% by weight; enabling the tapped molten steel to be subjected to pre-refining, and obtaining pre-refined molten steel; adding lime and fluorite in the pre-refining process to control the oxygen content in the pre-refined molten steel to be 0.030%-0.040% by weight; and enabling the pre-refined molten steel to be subjected to VD refining, and obtaining low-carbon refined molten steel, wherein argon bottom blowing and vacuumizing treatment are carried out in the VD refining process, the vacuum degree after vacuumizing treatment is measured, the flow of bottom blowing argon is adjusted to be 0.25-1.5 Nl / min / ton of steel and the time is adjusted to be 0-5 min according to the vacuum degree. The method adopts a VD refining natural decarburization light treatment manner to achieve quick decarburization.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for producing low-carbon steel by adopting a VD refining light decarburization process. Background technique [0002] VD refining has good decarburization kinetics conditions. The development of VD rapid decarburization process can not only expand the production capacity of low-carbon or ultra-low carbon steel, but also has very important significance for widening the range of varieties. At the same time, it can improve production efficiency. The cost reduction has great benefits. As product development requires higher and higher C content, the use of VD refining technology for decarburization under high vacuum has become a technical problem faced by VD equipment in the production of low-carbon steel. In the case of low-carbon steel and ultra-low carbon steel, which are mainly cold-rolled and hot-rolled products, the demand for VD refining and decarburization is con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/068C21C7/076C21C7/10C21C7/072
CPCC21C7/068C21C7/076C21C7/10C21C7/072Y02P10/20
Inventor 朱国森朱志远刘金刚初仁生王国连郝宁李海波杨荣光
Owner SHOUGANG CORPORATION
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