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

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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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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