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Method for producing ultra-low carbon steel through RH complex deoxidation

A technology of ultra-low carbon steel and composite deoxidation, which is applied in the field of steelmaking in the metallurgical industry to avoid nodules

Inactive Publication Date: 2017-11-17
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technique does not specify which alloys to add to deoxidize

Method used

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  • Method for producing ultra-low carbon steel through RH complex deoxidation
  • Method for producing ultra-low carbon steel through RH complex deoxidation

Examples

Experimental program
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Effect test

Embodiment 1

[0055] (1) Pretreatment of molten iron: desulfurization by spraying method, slag removal after desulfurization, and control of sulfur content in molten iron after desulfurization to 0.002%.

[0056] (2) Converter smelting: use 260t top-bottom combined blowing converter smelting, control the carbon content of molten steel tapping: 0.03%, control the oxygen content in steel: 900ppm, control the end point temperature of molten steel: 1690°C, and control the temperature of the ladle top after tapping The slag is added into high alumina balls for modification treatment;

[0057] (3) RH vacuum treatment: the oxygen content in the steel is 900ppm, and the natural decarburization method is adopted, that is, the RH furnace does not blow oxygen. After decarburization, the carbon content in the steel is controlled at 10ppm.

[0058] After decarburization in the RH refining furnace, add silicon calcium magnesium deoxidizer 0.12kg / t steel first, and then add aluminum for deoxidation after...

Embodiment 2

[0062] (1) Hot metal pretreatment: Desulfurization by injection method, slag removal after desulfurization, and control of sulfur content in hot metal after desulfurization to 0.003%.

[0063] (2) Converter smelting: use a 260t top-bottom combined blowing converter to smelt, control the carbon content of the molten steel: 0.02%, control the oxygen content in the steel: 1000ppm, control the end point temperature of the molten steel: 1700°C, and place the steel on the top of the ladle after tapping. The slag is added into high alumina balls for modification treatment;

[0064] (3) RH vacuum treatment: the oxygen content in the steel is 1000ppm, and the natural decarburization method is adopted, that is, the RH furnace does not blow oxygen. After decarburization, the carbon content in the steel is 9ppm.

[0065] After the decarburization of the RH refining furnace is completed, 0.15 kg / t of silicon calcium magnesium deoxidizer is added first, and then aluminum is added for deoxi...

Embodiment 3

[0069] (1) Hot metal pretreatment: Desulfurization by injection method, slag removal after desulfurization, and control of sulfur content in hot metal after desulfurization to 0.003%.

[0070] (2) Converter smelting: use a 260t top-bottom combined blowing converter to smelt, control the carbon content of the molten steel: 0.06%, control the oxygen content in the steel: 500ppm, control the end point temperature of the molten steel: 1680°C, and place the steel on the top of the ladle after tapping. The slag is added into high alumina balls for modification treatment;

[0071] (3) RH vacuum treatment: If the oxygen content in the steel is 500ppm, the forced oxygen blowing method is adopted, that is, oxygen is blown into the RH furnace. After decarburization, the carbon content in the steel is 8ppm.

[0072] After decarburization in the RH refining furnace, add silicon calcium magnesium deoxidizer 0.18kg / t steel first, and then add aluminum for deoxidation after 2 minutes.

[00...

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Abstract

The invention discloses a method for producing ultra-low carbon steel through RH complex deoxidation. According to the method, after completion of decarbonization of an RH refining furnace, a silicon-calcium-magnesium deoxidizing agent of 0.1-0.2 kg / t steel is added; after 1-2 min, aluminum is added to conduct deoxidization, and pouring is protected in the whole continuous casting process. On the premise of meeting the requirement for components of molten steel, continuous casting nozzle clogging is effectively avoided, and generated inclusions are spherical compound inclusions.

Description

technical field [0001] The invention relates to a steelmaking technology produced in the metallurgical industry, in particular to a method for producing ultra-low carbon steel through RH composite deoxidation. Background technique [0002] The patent document with the patent application number 201410116425.9 discloses a production method of ultra-low carbon steel with ultra-low oxygen content molten steel. After RH refining and decarburization, aluminum is directly used for deoxidation, and the deoxidized product produced is Al 2 o 3 . This technology has the following defects, on the one hand Al 2 o 3 The viscosity in molten steel is high, and it is easy to accumulate and block the nozzle when the molten steel is poured; on the other hand, Al 2 o 3 At the rolling temperature, it is a hard and angular inclusion. After the steel is rolled, it is easy to form microscopic holes inside the steel, which is not conducive to the use of users in the future. [0003] The patent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/068C21C7/06C21C1/00
CPCC21C1/00C21C7/0006C21C7/06C21C7/068C21C7/10
Inventor 李峰宋冉臣王爱兰
Owner INNER MONGOLIA BAOTOU STEEL UNION
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