A kind of production method of low carbon killed steel

A carbon-killed steel and production method technology, which is applied in the production field of low-carbon killed steel, can solve the problems of high risk of slag overflow, difficulty in controlling the foaming degree of top slag, and high production cost, so as to reduce costs, eliminate the risk of slag overflow, The effect of improving cleanliness

Active Publication Date: 2021-04-02
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

[0041] A method for producing low-carbon killed steel, wherein the carbon content upper limit of the low-carbon killed steel is 0.10% by mass, comprising the following steps:

[0042] 1. Steelmaking process

[0043] 1) The carbon content at the end point of the converter is 0.05%;

[0044] 2) Boiling tapping, the headroom of the large tank is 400mm.

[0045] 2. Refining process

[0046] 1) After the molten steel enters the treatment position of the LF furnace, 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 steel Water amount × (finished carbon upper limit - carbon content in molten steel - 0.01%) / carbon content of carbon deoxidizer;

[0047] 2) The temperature of the electrode is raised for 9 minutes, and the volume of argon blowing is 200L / min.

[0048] 3) During the heating process, add the remaining slag materials, and the lime and bauxi...

Embodiment 2

[0053] A method for producing low-carbon killed steel, wherein the carbon content upper limit of the low-carbon killed steel is 0.15% by mass, comprising the following steps:

[0054] 1. Steelmaking process

[0055] 1) The carbon content at the end point of the converter is 0.06%;

[0056] 2) Boiling tapping, the headroom of the large tank is 500mm.

[0057] 2. Refining process

[0058]1) After molten steel enters the LF furnace treatment position, add slag material (4.5kg / ton steel lime, 2.3kg / ton steel bauxite), and add carbon deoxidizer after the slag material is completely melted, the amount of carbon deoxidizer added It is the amount of molten steel × (upper carbon limit of finished product - carbon content in molten steel - 0.01%) / carbon content of carbon deoxidizer;

[0059] 2) The temperature of the electrode is raised for 8 minutes, and the volume of argon blowing: 260L / min.

[0060] 3) During the heating process, add the remaining slag materials, and the lime and...

Embodiment 3

[0065] A method for producing low-carbon killed steel, wherein the carbon content upper limit of the low-carbon killed steel is 0.24% by mass, comprising the following steps:

[0066] 1. Steelmaking process

[0067] 1) The carbon content at the end of the converter is 0.09%;

[0068] 2) Boiling tapping, the headroom of the large tank is 600mm.

[0069] 2. Refining process

[0070] 1) After molten steel enters the LF furnace treatment position, add slag material (5kg / ton of steel lime, 2.5kg / ton of steel bauxite), and add carbon deoxidizer after the slag material is completely melted. The amount of carbon deoxidizer added is Amount of molten steel × (upper carbon limit of finished product - carbon content in molten steel - 0.01%) / carbon content of carbon deoxidizer;

[0071] 2) The temperature of the electrode is raised for 10 minutes, and the volume of argon blowing is 300L / min.

[0072] 3) During the heating process, add the remaining slag materials, and the lime and baux...

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PUM

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Abstract

The invention relates to a production method of low-carbon killed steel. The mass percentage of the upper limit of the carbon content of the low-carbon killed steel is 0.10% to 0.25%, carbon is left in a converter, boiling and tapping are conducted, and the mass percentage of the endpoint carbon content is controlled according to the formula: 0.05%<=C<=the upper limit of finished carbon-0.03%; after molten steel in a boiling state enters an LF treatment position, the first batch of slag is added firstly to dilute oxidability of top slag in a molten steel tank, and then a carbon desoxidant is added; and electrodes are heated, stone slag is deoxidized through lime, the carbon desoxidant and high-temperature electricity making of an electric arc. The production method has the advantages thatthe steps are conducted in an LF under the ordinary pressure; the carbon desoxidant is utilized to replace parts of silicon and aluminum to serve as a desoxidant, and the cost is low and is lowered; compared with a current common silicon deoxygenation technology and a current common aluminum deoxygenation technology, the cost of tons of steel can be lowered by 10-20 yuan; and meanwhile, after carbon deoxygenation, the molten steel has no deoxygenation product residue, and thus the cleanliness of the molten steel is improved advantageously.

Description

technical field [0001] The invention belongs to the field of low-carbon steel production, in particular to a production method of low-carbon killed steel. Background technique [0002] In conventional steelmaking methods, especially in the production of low-carbon killed steel, 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-oxygen reaction, so that the oxygen in molten steel becomes CO to be eliminated. At this time, carbon becomes a deoxidizer in a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06
CPCC21C7/06
Inventor 梅雪辉张晓军臧绍双李德军王宏明李俊峰金龙
Owner ANGANG STEEL CO LTD
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