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A kind of production method of aluminum-free medium and high carbon steel

A production method, medium and high carbon technology, applied in the direction of manufacturing converters, etc., can solve the problems of fluorite polluting the environment, low alkalinity of top slag, endangering human health, etc., and achieve the effects of reducing environmental pollution, improving heating efficiency, and improving quality

Active Publication Date: 2021-05-28
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the slagging agent of the LF furnace mainly uses fluorite, and it is difficult to use other slag removing agents to remove slag, and the dosage is large, and the basicity of the top slag is low, which is not conducive to desulfurization
Causes huge consumption of fluorite in steel plants
Although fluorite has a good effect on slag, fluorite pollutes the environment, endangers human health, and is a non-renewable resource

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for producing aluminum-free medium-high carbon steel, the mass percentage of the upper limit of the carbon content of the medium-high carbon steel is 0.35%, comprising the following steps:

[0034] 1. Steelmaking process

[0035] 1) The molten iron is desulfurized, and the S content in the molten iron after desulfurization is 0.015%;

[0036] 2) The carbon content at the end point of the converter is 0.15%;

[0037] 3) No silicon-based deoxidizer is added to the converter; the clearance of the molten steel tank is 400mm;

[0038] 2. Refining process

[0039] 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 product carbon upper limit - carbon content in molten steel - 0.03%) / carbon deoxidizer carbon content.

[0040] 2) The...

Embodiment 2

[0045] A method for producing aluminum-free medium-high carbon steel, the mass percentage of the upper limit of the carbon content of the medium-high carbon steel is 0.50%, comprising the following steps:

[0046] 1. Steelmaking process

[0047] 1) The molten iron is desulfurized, and the S in the molten iron after desulfurization is 0.018%;

[0048] 2) The carbon content at the end point of the converter is 0.25%;

[0049] 3) No silicon-based deoxidizer is added to the converter; the clearance of the molten steel tank is 600mm;

[0050] 2. Refining process

[0051] 1) After molten steel enters the LF furnace treatment position, add slag material (4.5kg / 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 It is the amount of molten steel × (the upper limit of carbon in the finished product - the carbon content in molten steel - 0.03%) / the carbon content of the carbon deoxidi...

Embodiment 3

[0057] A method for producing aluminum-free medium-high carbon steel, the mass percentage of the carbon content upper limit of the medium-high carbon steel is 0.60%, comprising the following steps:

[0058] 1. Steelmaking process

[0059] 1) The molten iron is desulfurized, and the S in the molten iron after desulfurization is 0.017%;

[0060] 2) The carbon content at the end point of the converter is 0.40%;

[0061] 3) No silicon-based deoxidizer is added to the converter; the clearance of the molten steel tank is 600mm;

[0062] 2. Refining process

[0063] 1) After molten steel enters the LF furnace treatment position, add slag material (4.7kg / 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 × (the upper limit of carbon in the finished product - the carbon content in molten steel - 0.03%) / the carbon content of the carbon deoxidizer;

...

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Abstract

The invention relates to a method for producing aluminum-free medium-high carbon steel. The carbon content of the aluminum-free medium-high-carbon steel is not less than 0.35% by mass. Add slag and carbon deoxidizer after the molten steel enters the LF furnace treatment position; the electrode is heated up, and the high-temperature electric slag is deoxidized by using lime, carbon deoxidizer and electric arc. The advantage is that the present invention controls the SiO in the top slag of molten steel by not adding a silicon-based deoxidizer to the converter. 2 The content is not more than 10% of the total slag, and bauxite or bauxite-based slag material is used to completely replace fluorite, so that the melting temperature of the top slag is lower, which is beneficial to slag melting. Because fluorite is not used and the oxidation of silicon is reduced, it is beneficial to improve the quality of steel types such as heavy rail steel and cord steel.

Description

technical field [0001] The invention belongs to the refining treatment technology of steelmaking and continuous casting, and in particular relates to a production method of aluminum-free medium-high carbon steel. Background technique [0002] The production process of aluminum-free medium and high carbon steel mainly adopts converter-LF furnace-continuous casting machine process. The liquidus temperature of aluminum-free medium-high carbon steel is low, and the slag of LF furnace is difficult to melt. Among them, the slagging agent of the LF furnace is mainly fluorite, and it is difficult to use other slagging agents to remove slag, and the dosage is large, and the basicity of the top slag is low, which is not conducive to desulfurization. The consumption of fluorite in iron and steel plants is huge. Although the slag effect of fluorite is good, fluorite pollutes the environment, endangers human health, and is a non-renewable resource. Contents of the invention [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/064C21C5/36C22C33/04
CPCC21C5/36C21C7/06C21C7/064C22C33/04
Inventor 梅雪辉吴春杰臧绍双李德军周福鼎王小善
Owner ANGANG STEEL CO LTD
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