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A kind of production method of silicon deoxidized low-sulfur high-carbon steel

A production method and high-carbon steel technology, applied in the field of iron and steel metallurgical molten steel refining, can solve the problems of unstable steel quality, insufficient desulfurization conditions, large fluctuations in sulfur content, etc., to solve the problem of difficult desulfurization, high removal rate of inclusions, and high desulfurization efficiency high effect

Active Publication Date: 2020-03-20
CENT IRON & STEEL RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned analysis, the present invention aims to provide a method for producing silicon deoxidized low-sulfur high-carbon steel, which is used to solve the existing production of silicon-deoxidized low-sulfur high-carbon steel without molten iron pretreatment process, resulting in large desulfurization pressure and LF in production. Insufficient desulfurization conditions in the refining process, large fluctuations in the control of sulfur content in steel, and unstable steel quality; while the LF refining process of the present invention adopts specific components and performance refining with high sulfur removal efficiency, good inclusion denaturation and plasticization Slag smelting method

Method used

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  • A kind of production method of silicon deoxidized low-sulfur high-carbon steel
  • A kind of production method of silicon deoxidized low-sulfur high-carbon steel
  • A kind of production method of silicon deoxidized low-sulfur high-carbon steel

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Embodiment 1

[0059] The method of the present invention is used to process 55SiCrA spring steel produced by an electric furnace-LF-VD-CC process flow in a certain factory, and the specific implementation process is as follows:

[0060] (1) The carbon content at the end of the electric furnace is 0.13%. During the tapping process, 4kg / t steel low-nitrogen carbon powder is first mixed with the steel flow, and 16kg / t steel low-aluminum ferrosilicon and 5kg / t steel medium-carbon ferromanganese are added for deoxidation. and finish within 1 / 3 of the tapping amount; then add 3kg / t steel lime, 5kg / t steel aluminum-free refining slag, and 0.5kg / t steel calcium carbide as slag materials for slag modification, / 3~4 / 5 when the addition is completed; the tapping process adopts strong stirring, and the amount of slag is strictly controlled during tapping; strong stirring means that the bottom blowing flow rate per 100t of steel is 400NL / min~1000NL / min;

[0061] (2) After the LF enters the station, turn...

Embodiment 2

[0071] 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:

[0072] (1) The carbon content at the end of the electric furnace is 0.14%. During the tapping process, 4.1kg / t steel low-nitrogen carbon powder is first mixed with the steel flow, and 15kg / t steel low-aluminum ferrosilicon and 4.8kg / t steel medium-carbon ferromanganese are added. Deoxidation alloying is completed within 1 / 3 of the tapping amount; then 3.2kg / t steel lime, 5.1kg / t steel aluminum-free refining slag, and 0.6kg / t steel calcium carbide are added as slag materials for slag modification. Adding is completed when the tapping amount is 2 / 3~4 / 5, the tapping process adopts strong stirring, and the amount of slag is strictly controlled during tapping; strong stirring means that the bottom blowing flow rate per 100t of steel is 400NL / min~1000NL / min;

[0073] (2) After the LF enters the station, ...

Embodiment 3

[0083] For the preparation of hard wire steel or cord steel, the production method of silicon deoxidized low sulfur high carbon steel in this embodiment is also applicable to produce hard wire steel or cord steel, because the chemical composition of hard wire steel or cord steel is different, Therefore, in the process of deoxidation alloying treatment, upgrading treatment and reducing refining slag production, the addition amount of each component is not the same.

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Abstract

The invention relates to a production method for silicon deoxidation low-sulfur high-carbon steel. An electric furnace-LF-VD-continuous casting process is adopted. The production method comprises thesteps that 1, in the steel tapping process of an electric furnace, carbon powder is added firstly, then a silicon alloy and a manganese alloy are added for deoxidation alloying treatment, and then lime, calcium carbide, aluminum-free refining slag are added to conduct modification treatment on slag; 2, after an LF enters a station, reductive refining slag is made; 3, after it is determined that the sulfur content in molten steel is controlled to be under a target value, the content of all components in the molten steel is adjusted to be within the required high-carbon steel component range; and 4, the LF leaves the station after refining, VD and continuous casting processes are sequentially conducted, and the silicon deoxidation low-sulfur high-carbon steel is obtained. The production method is provided under the overall background of the molten-iron-free pretreatment desulfurization process in traditional smelting production of the silicon deoxidation low-sulfur high-carbon steel, thelimit of production of the silicon deoxidation low-sulfur high-carbon steel through the molten-iron-free pretreatment desulfurization process on equipment is overcome, in the LF refining process, therefining slag with the specific components and properties is smelted, and the dual purposes of efficient desulfurization of the molten steel and plastification control over inclusions are realized.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy molten steel refining, in particular to a production method of silicon-deoxidized low-sulfur high-carbon steel. 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 carbon steel, aluminum deoxidation and silicon ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/064C21C7/10C22C33/04
CPCC21C7/0006C21C7/0025C21C7/06C21C7/064C21C7/0645C21C7/10C22C33/04
Inventor 林路杨利彬吴伟梁强肖金福汪成义曾加庆
Owner CENT IRON & STEEL RES INST
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