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Low-fluorine slag system for electroslag remelting of B-containing 9Cr rotor steel ingot and use method of low-fluorine slag system

A technology of electroslag remelting and rotor steel, which is applied in the field of electroslag special metallurgy, can solve the problems of unstable smelting, environmental protection, and high energy consumption of smelting slag, and achieve good energy saving advantages, reduce burning loss, and reduce power consumption Effect

Active Publication Date: 2020-06-19
CENT IRON & STEEL RES INST
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Problems solved by technology

[0005] In view of the above analysis, the embodiment of the present invention aims to provide a low-fluorine slag system for electroslag remelting of B-containing 9Cr rotor steel ingots and its application method to solve the problem of the existing B-containing electroslag smelting slag system. High consumption, unstable smelting and environmental protection

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[0024] Preferred embodiments of the present invention are specifically described below, and the embodiments of the present invention are used to explain the principle of the present invention, but not to limit the scope of the present invention.

[0025] The object of the present invention is to provide a low-fluorine slag system for electroslag remelting of B-containing 9Cr rotor steel ingots and its application method. Based on the thermodynamic phase diagram, the content of each component in the slag system is calculated according to the temperature range of the slag system design. The obtained slag system has a stable composition structure, which can balance the easy-to-burn B elements in the steel slag, and has the advantages of energy saving and other advantages. Difficult technical requirements for electroslag smelting of 9Cr high-pressure rotor steel containing B, providing technical support for electroslag smelting of new materials.

[0026] On the one hand, the prese...

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Abstract

The invention relates to a low-fluorine slag system for electroslag remelting of a B-containing 9Cr rotor steel ingot and a use method of the low-fluorine slag system, and belongs to the technical field of electroslag special metallurgy. The problems of high fluorine content and serious environmental pollution of the low-fluorine slag system for electroslag remelting of the B-containing 9Cr high-pressure rotor steel ingot in the prior art are solved. According to the low-fluorine slag system for electroslag remelting of the B-containing 9Cr rotor steel ingot, the slag system comprises the following components of, in percentage by mass, 5%-30% of CaF2, 25%-35% of CaO, 40%-50% of Al2O3, 2%-5% of MgO, 0.1%-3% of B2O3, and the balance impurities, wherein SiO2 in the impurities is less than 0.5%. The low-fluorine slag system for electroslag remelting of the B-containing 9Cr rotor steel ingot has the advantages of obvious energy saving and emission reduction effects, high electric efficiencyand small environmental pollution.

Description

technical field [0001] The invention relates to the technical field of electroslag special metallurgy, in particular to a low-fluorine slag system used for electroslag remelting of B-containing 9Cr rotor steel ingots and a method for using the same. Background technique [0002] China is the world's largest producer and consumer of electricity, and the proportion of thermal power generation in China is 70% to 80%. However, most thermal power units are generally inefficient, which not only causes energy waste, but also brings serious environmental pollution. Therefore, China urgently needs to vigorously develop high-efficiency power generation technologies, both from an economic point of view and from an environmental point of view. The method to improve power generation efficiency of power station includes two aspects: reasonable management technology and improving unit efficiency. Among them, the effective way to improve unit efficiency is to improve steam parameter level ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18
CPCC22B9/18
Inventor 林腾昌杨勇姚同路倪冰贺庆孟华栋
Owner CENT IRON & STEEL RES INST
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