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

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.

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...

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Problems solved by technology

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 back blowing of molten steel and affect the purity of molten steel. On the other hand, if the end carbon of molten steel is higher than 0.03%, and the chemical composition of the steel requires that the carbon content be controlled at 0.03-0.05%, the manganese content be controlled at 1.0-2.0%, and contain 0.2- When 0.5% Cr, in order to meet the requirements of the finished product, it is necessary to use high-priced alloys such as metal manganese and micro-carbon ferrochrome in the alloying process, which increases the cost

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