Method for smelting low-carbon alloy steel by utilizing RH decarburization

A low-carbon alloy steel and decarburization technology, applied in the manufacture of converters, etc., can solve the problems of loss of internal quality of steel, influence of molten steel purity, molten steel post-blowing, etc., to reduce serious post-blowing, meet chemical composition requirements, and ensure Effect of molten steel pouring temperature

CN106957941AInactive Publication Date: 2017-07-18TANGSHAN IRON & STEEL GROUP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-07-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for smelting low-carbon alloy steel by using RH decarburization, which comprises converter smelting, RH treatment and LF refining processes, wherein the converter smelting process is for decarburization, and the RH treatment process is for oxygen blowing deep decarburization and decarburization Hydrogen, LF refining process for deoxidation and alloying. This method reduces the task of deep decarburization of the converter, makes full use of RH that does not damage the quality of molten steel for deep decarburization, uses LF to heat up and alloy molten steel, and ensures the pouring temperature of molten steel, which not only reduces production costs, but also ensures Steel quality. The method can alleviate severe back blowing caused by deep decarburization of the converter and ensure the quality of molten steel. At the same time, cheap low-carbon ferromanganese and medium-carbon ferrochrome can be used for alloying to meet the chemical composition requirements of low-carbon alloy steel.
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Description

technical field

[0001] The invention relates to a steelmaking method, in particular to a method for smelting low-carbon alloy steel by utilizing RH decarburization. Background technique

[0002] As the country's requirements for energy conservation and environmental protection become more and more stringent, the technological progress of the traditional steel industry has been further promoted, and the realization of high strength and high toughness of steel materials is the mainstream development direction. The main means to achieve high strength and high toughness of steel materials is to reduce the carbon content in steel and use alloying elements for strengthening. The traditional smelting process is converter-deoxidation alloying-LF refining-continuous casting. In this way, a very prominent contradiction arises. From the perspective of metallurgy, it is generally believed that when the end-point C content in converter molten steel is below 0.03%, it will cause severe b...

Examples

Embodiment 1－12

[0011] Embodiment 1-12: The method for smelting low-carbon alloy steel by using RH decarburization adopts the following process.

[0012] (1) This method changes the traditional steelmaking process and subverts the traditional mode of deoxidation alloying after converter smelting. Add RH treatment process in the process of smelting low carbon alloy steel, use RH to carry out deep decarburization of molten steel, then heat up in LF, and place deoxidation alloying in LF refining process; the process flow is converter-RH-LF —Continuous casting. RH can decarburize molten steel. The decarburization principle is to use oxygen in molten steel to decarburize under vacuum conditions to generate CO / CO. 2 Gas, discharged from molten steel. It will neither damage the quality of molten steel, but also reduce the carbon content in steel to a very low level. The tasks of each process are also fundamentally different from the traditional method, see Table 1 for specific comparison.

[001...