A method for producing low-carbon killed steel by carbon deoxidation process under normal pressure

A carbon-killed steel and carbon deoxidation technology, which is applied in the field of steelmaking and continuous casting refining, can solve the problems of high production cost, difficulty in controlling the foaming degree of top slag, and high risk of slag overflow, so as to improve cleanliness and eliminate the risk of slag overflow , cost reduction effect

Active Publication Date: 2021-07-20
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is not easy to control the foaming degree of the top slag, and the risk of slag overflow is high
At present, silicon deoxidation or aluminum deoxidation is used to produce low-carbon killed steel, and the production cost is also relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A method for producing low-carbon killed steel by a carbon deoxidation process under normal pressure, the carbon content upper limit of the low-carbon killed steel is 0.05% by mass, comprising the following steps:

[0061] 1. Steelmaking process

[0062] 1) The mass percentage of carbon content at the end point of the converter is 0.04%;

[0063] 2) Boiling tapping, the headroom of the large tank is 400mm.

[0064] 2. Refining process

[0065] 1. When the molten steel reaches the pretreatment position of the LF furnace, argon is blown for 2 minutes, and the amount of argon blowing is controlled above 500L / min. After the top slag is melted, the argon gas is turned off to set the oxygen, and the oxygen value is 600ppm.

[0066] 2. After molten steel enters the LF furnace treatment position, add slag material (4kg / ton steel lime, 2kg / ton steel bauxite), and add carbon deoxidizer after the slag material is completely melted, and the amount of carbon deoxidizer added is st...

Embodiment 2

[0073] A method for producing low-carbon killed steel by a carbon deoxidation process under normal pressure, the carbon content upper limit of the low-carbon killed steel is 0.05% by mass, comprising the following steps:

[0074] 1. Steelmaking process

[0075] 1) The mass percentage of carbon content at the end point of the converter is 0.05%;

[0076] 2) Boiling tapping, the headroom of the large tank is 500mm.

[0077] 2. Refining process

[0078] 1. When the molten steel reaches the pretreatment position of the LF furnace, argon is blown for 2 minutes, and the amount of argon blowing is controlled above 500L / min. After the top slag is melted, the argon gas is turned off to set the oxygen, and the oxygen value is 500ppm.

[0079] 2. After the molten steel enters the LF furnace treatment position, add slag material (4.1kg / ton steel lime, 2.2kg / ton steel bauxite), and add carbon deoxidizer after the slag material is completely melted, and the amount of carbon deoxidizer add...

Embodiment 3

[0086] A method for producing low-carbon killed steel by a carbon deoxidation process under normal pressure, the carbon content upper limit of the low-carbon killed steel is 0.07% by mass, comprising the following steps:

[0087] 1. Steelmaking process

[0088] 1) The mass percentage of carbon content at the end point of the converter is 0.06%;

[0089] 2) Boiling tapping, the headroom of the large tank is 500mm.

[0090] 2. Refining process

[0091] 1. When the molten steel reaches the pretreatment position of the LF furnace, argon is blown for 3 minutes, and the amount of argon blowing is controlled above 500L / min. After the top slag is melted, the argon gas is turned off to set the oxygen, and the oxygen value is 500ppm.

[0092] 2. After molten steel enters the LF furnace treatment position, add slag material (5kg / ton steel lime, 2.5kg / ton steel bauxite), and add carbon deoxidizer after the slag material is completely melted. The amount of carbon deoxidizer added is Amo...

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PUM

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Abstract

The invention relates to a method for producing low-carbon killed steel by a carbon deoxidation process under normal pressure. The mass percentage of the upper limit of the carbon content of the low-carbon killed steel is 0.05% to 0.08%. The mass percentage of carbon content at the end point is controlled according to 0.04%≤C≤the carbon upper limit of the finished product-0.01%; enter the LF furnace for treatment, blow argon and then fix the oxygen, first add the first batch of slag to dilute the oxidation of the top slag in the molten steel tank, and then add carbon element deoxidizer; electrode temperature rises, deoxidizes by using lime and carbon deoxidizer and high-temperature electric slag of electric arc. The advantage is: the carbon deoxidation reaction is mainly carried out in the LF furnace under normal pressure, and the carbon deoxidizer is used to replace part of the silicon and aluminum as the deoxidizer, which reduces the cost. At the same time, carbon deoxidation has no deoxidation product residue in molten steel, which is beneficial to improve the cleanliness of molten steel.

Description

technical field [0001] The invention belongs to the field of steelmaking and continuous casting and refining, and in particular relates to a method for producing low-carbon killed steel by a carbon deoxidation process under normal pressure. Background technique [0002] In conventional steelmaking methods, especially the production of low-carbon killed steel with a carbon content of not more than 0.08%, deoxidation is mainly accomplished by elements such as silicon and aluminum that have a higher affinity for oxygen than iron. These elements interact with the oxygen dissolved in molten steel to form deoxidized products that are insoluble in molten steel, and the oxygen content in steel is reduced due to their flotation. [0003] The carbon deoxidation process is mainly used in vacuum conditions, using RH, VD and other vacuum refining equipment to make carbon and oxygen react. Under vacuum conditions, the excess carbon in molten steel can react with oxygen to generate carbon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C5/36
CPCC21C5/36C21C7/0006C21C7/0025C21C7/06Y02P10/20
Inventor 梅雪辉张晓军吴春杰李曙光许海亮温荣宇赵晨光郭猛
Owner ANGANG STEEL CO LTD
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