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Slag system for electroslag remelting containing b-type 9cr heat-resistant steel, preparation method and application method

A technology for electroslag remelting and heat-resistant steel, which is applied in the field of electroslag remelting slag to achieve good slag-gold contact, reduce viscosity and surface tension, and improve resistivity.

Active Publication Date: 2022-03-29
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few technical reports on the slag used for electroslag remelting of B-containing heat-resistant steel in the industry

Method used

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  • Slag system for electroslag remelting containing b-type 9cr heat-resistant steel, preparation method and application method
  • Slag system for electroslag remelting containing b-type 9cr heat-resistant steel, preparation method and application method
  • Slag system for electroslag remelting containing b-type 9cr heat-resistant steel, preparation method and application method

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Effect test

Embodiment 1

[0050] The mass percentage of the chemical composition of the slag system for the electroslag remelting containing B-type 9Cr heat-resistant alloy of the present embodiment is: CaF 2 : 54.2%, Al 2 o 3 : 22%, CaO: 19%, MgO: 3%, B 2 o 3 : 1%, impurity 0.8%; impurity in the unstable oxide SiO 2 The content accounts for 0.6% of the slag system.

[0051] The melting temperature of the slag system is 1338°C, and the viscosity of the slag system is 0.004Pa.s at a temperature of 1600°C.

[0052] The above slag system was used for electroslag remelting, and the type of remelting alloy was COST-FB2 steel, whose composition is shown in Table 1. The alloy has a melting point of 1498°C.

[0053] Table 1 Composition requirements of FB2 steel (mass fraction / %)

[0054]

[0055] The content of B in the electrode used for electroslag remelting COST-FB2 steel is 0.01%, the content of Si is 0.05%, and the content of Al is 0.0035%. The diameter of the crystallizer is 350mm, and the qua...

Embodiment 2

[0068] The mass percentage of the chemical composition of the slag system for the electroslag remelting containing B-type 9Cr heat-resistant alloy of the present embodiment is: CaF 2 : 60%, Al 2 o 3 : 17%, CaO: 16.2%, MgO: 3%, B 2 o 3 : 3%, impurity 0.8%; impurity in the unstable oxide SiO 2 The content accounts for 0.7% of the slag system.

[0069] The melting temperature of this slag system is 1305°C. At a temperature of 1600°C, the viscosity of the slag system is 0.005Pa.s.

[0070] The above-mentioned slag system is used for electroslag remelting, and the type of remelting alloy is CB2 steel, and its composition is shown in Table 3. The alloy has a melting point of 1489°C.

[0071] Table 3 Composition requirements of CB2 steel (mass fraction / %)

[0072]

[0073] The content of B in the electrodes used for electroslag remelting CB2 steel is 0.009%. The diameter of the crystallizer is 280mm, and the quality of the slag is 23kg. The process of electroslag remelti...

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Abstract

The invention relates to a slag system for electroslag remelting containing B-type 9Cr heat-resistant steel, comprising: CaF in mass percentage 2 : 50‑60%, Al 2 o 3 : 15%‑25%, CaO: 15%‑25%, MgO: 3%‑8%, B 2 o 3 : 0.5%‑3%, the balance is impurities, impurity content ≤ 1%, the sum of the above items is 100%; the impurity contains unstable oxide SiO 2 , unstable oxide SiO 2 It accounts for ≤0.8% of the slag system. The slag system can be used for electroslag remelting to produce B-type 9Cr heat-resistant steel, such as COST‑FB2 steel or CB2 steel. The uniform distribution ensures the uniformity of the alloy structure and further improves the high temperature creep performance of the alloy; in addition, the lower melting point of the slag system makes the electroslag ingot easy to solidify and form, effectively reducing or eliminating the surface defects of the electroslag ingot. The melting point, viscosity and other physical parameters of the slag system provided by the present invention all meet the requirements for smelting B-type 9Cr heat-resistant steel by electroslag remelting.

Description

technical field [0001] The invention relates to the technical field of electroslag remelting slag, in particular to a slag system for electroslag remelting containing B-type 9Cr heat-resistant steel, a preparation method and a use method. Background technique [0002] In order to reduce environmental pollution, it is necessary to greatly improve the efficiency of thermal power generation. The thermal efficiency of the unit mainly depends on the steam parameters of the unit, that is, the temperature and pressure of the steam. When the steam temperature increases from 600°C to 630°C, CO 2 The emissions will be reduced by 8%-10%, and the thermal efficiency will be increased to 45%-50%. Therefore, the development of ultra-supercritical thermal power units has the advantages of high efficiency, energy saving and environmental protection. [0003] At present, 9%-12% Cr heat-resistant steel has excellent high-temperature strength, good oxidation resistance and thermal corrosion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/18
CPCC22B9/18
Inventor 姜周华彭雷朕耿鑫李晓凯侯昱李花兵刘福斌李星李博洋
Owner NORTHEASTERN UNIV
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