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A method of producing silicon-deoxidized low-sulfur high-carbon steel using lf refining double-slag method

A technology for refining slag and high-carbon steel, which is applied in the field of molten steel refining in iron and steel metallurgy. It can solve the problems of large fluctuations in sulfur content control, unstable steel quality, and insufficient desulfurization conditions, and achieve the solution of difficult desulfurization, improved cleanliness of molten steel, and inclusions Good control effect on physical properties and plasticization

Active Publication Date: 2020-01-17
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of above-mentioned analysis, the present invention aims to provide a kind of method that adopts LF refining double slag method to produce silicon deoxidation low-sulfur high-carbon steel, in order to solve existing production silicon-deoxidation low-sulfur high-carbon steel without molten iron pretreatment process, causes production The problems of high desulfurization pressure in the medium and insufficient desulfurization conditions in the LF refining process, large fluctuations in the control of sulfur content in the steel, and unstable steel quality; while the LF refining process of the present invention uses a double Slag smelting process

Method used

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  • A method of producing silicon-deoxidized low-sulfur high-carbon steel using lf refining double-slag method
  • A method of producing silicon-deoxidized low-sulfur high-carbon steel using lf refining double-slag method
  • A method of producing silicon-deoxidized low-sulfur high-carbon steel using lf refining double-slag method

Examples

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Effect test

Embodiment 1

[0068] This method is used to process 55SiCrA spring steel produced by an electric furnace-LF-VD-CC process flow in a certain factory. The specific implementation process is as follows:

[0069] (1) The carbon content at the end of the electric furnace is 0.14%. During the tapping process, 4kg / t low-nitrogen carbon powder is first mixed with the steel flow, and 16kg / t low-aluminum ferrosilicon and 5kg / t medium-carbon ferromanganese are added for deoxidation alloying, and Finish within 1 / 3 of the tapping amount; then add 3kg / t of lime, 5kg / t of aluminum-free refining slag, and 0.5kg / t of calcium carbide as slag materials for slag modification. When the addition is completed, strong stirring is used in the tapping process, and the amount of slag is strictly controlled during tapping; strong stirring means that the bottom blowing flow rate per 100t of steel is 400 NL / min~1000NL / min;

[0070] (2) After LF enters the station, turn on the electricity to heat, add 2kg / t low-alumina f...

Embodiment 2

[0083] This method is used for the production of 55SiCrA spring steel in a certain factory's electric furnace-LF-VD-CC process. The specific implementation process is as follows:

[0084] (1) The carbon content at the end of the electric furnace is 0.16%. During the tapping process, 3.8kg / t low-nitrogen carbon powder is mixed with the steel flow, and 17kg / t low-aluminum ferrosilicon and 5.5kg / t medium-carbon ferromanganese are added for deoxidation alloying. , and completed within 1 / 3 of the tapping amount; then add 3.5kg / t of lime, 5kg / t of aluminum-free refining slag, and 0.4kg / t of calcium carbide as slag materials for slag modification. Adding is completed at 4 / 5, strong stirring is adopted in the tapping process, and the amount of slag is strictly controlled during tapping; strong stirring means that the bottom blowing flow rate per 100t of steel is 400 NL / min~1000NL / min;

[0085] (2) After the LF enters the station, turn on the electricity to heat, add 1.5kg / t low-alumi...

Embodiment 3

[0098] For the preparation of hard wire steel or cord steel, it is also applicable to the LF refining double slag method in this embodiment to produce silicon deoxidized low sulfur hard wire steel or cord steel, because the chemical composition of hard wire steel or cord steel is different, so In the processes of deoxidation alloying treatment, upgrading treatment, high-basic reducing refining slag and low-basic reducing refining slag, the addition amount of each component is not the same.

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Abstract

The invention relates to a method for producing silicon deoxygenation low-sulfur high-carbon steel through an LF refining double slag method. An electric furnace-LF-VD continuous casting technology isadopted. The method includes the steps that in the electric furnace tapping process, carbon powder is mixed firstly, then a silicon alloy and a manganese alloy are added for conducting deoxygenationalloying treatment, and lime, calcium carbide and aluminum-free refining slag are added for conducting modification treatment; secondly, after an LF enters a station, lime, calcium carbide, silicon iron and aluminum-free refining slag are added into the furnace for making high-alkalinity reducing refining slag; thirdly, low-alkalinity reducing slag is made, and the content of components in moltensteel is adjusted; and fourthly, the LF withdraws from the station after refining, VD and continuous casting processes are conducted in sequence, and the silicon deoxygenation low-sulfur high-carbon steel is obtained. The method is simple, reliable, high in operability and easy to achieve, the production cost of the whole process is reduced, the sulfur removing efficiency is high, the cleanlinesslevel of molten steel is high, the problem that when a non-molten-steel pretreatment sulfur removing process is adopted for producing high-quality silicon deoxygenation low-sulfur high-carbon steel, sulfur removing is difficult is solved well, and therefore the product quality is improved, and the economic benefits of a steel enterprise are increased.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy molten steel refining, in particular to a method for producing silicon-deoxidized low-sulfur high-carbon steel by adopting the LF refining double-slag method. Background technique [0002] With the development of various high-tech industries in China, such as aerospace, high-speed railway, automobile industry, etc., the quality requirements for high-carbon steel required are also getting higher and higher, such as spring steel, hard wire steel, cord steel, etc. carbon steel. Take the spring steel used in the automobile industry as an example. At present, the spring steel used in high-end cars is still completely dependent on imports to a certain extent. Although the domestic production of spring steel is large, the quality cannot meet the high requirements. Further optimization of the domestic spring steel production process is needed. [0003] Due to the different uses of high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/10C21C7/064C22C33/04C22C33/06
CPCC21C7/0006C21C7/0025C21C7/0087C21C7/06C21C7/064C21C7/0645C21C7/10C22C33/04C22C33/06
Inventor 林路吴伟杨利彬崔怀周王杰曾加庆
Owner CENT IRON & STEEL RES INST
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