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Low-fluorine slag system for electroslag remelting of b-containing 9cr rotor steel ingot and its application method

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

Active Publication Date: 2021-11-02
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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Embodiment Construction

[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 used for electroslag remelting of B-containing 9Cr rotor steel ingots and a method for using the same, which belongs to the technical field of electroslag special metallurgy and solves the problem of electroslag remelting of B-containing 9Cr high pressure in the prior art The low-fluorine slag used for rotor steel ingots has high fluorine content and serious environmental pollution. A low-fluorine slag system used for electroslag remelting of B-containing 9Cr rotor steel ingots. The mass percentage of each component in the slag system is: CaF 2 ; 5% to 30%, CaO; 25% to 35%, Al 2 o 3 : 40% to 50%, MgO: 2% to 5%, B 2 o 3 : 0.1% ~ 3%, the rest is impurities; SiO in impurities 2 <0.5%. The low-fluorine slag system of electroslag remelting B-containing 9Cr rotor steel ingot has obvious energy-saving and emission-reduction effects, high electrical efficiency, and low 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 Patents(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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