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Electroslag remelting slag system of high-alloy heat-resistant steel and smelting method

A technology of electroslag remelting, heat-resistant steel, applied in the field of metal smelting, can solve problems such as difficult control, and achieve the effect of uniform composition

Pending Publication Date: 2022-03-01
沈阳金正冶金技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned patents only disclose the control methods of non-metallic inclusions in several types of steels, but the control of elemental components in these steels is not involved. How to control the elements that are difficult to control in steels is a very critical problem. These elements It plays a decisive role in the influence of steel properties. At present, there is no report on the slag system related to the electroslag remelting smelting of high-alloy heat-resistant steel. Needed

Method used

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  • Electroslag remelting slag system of high-alloy heat-resistant steel and smelting method
  • Electroslag remelting slag system of high-alloy heat-resistant steel and smelting method
  • Electroslag remelting slag system of high-alloy heat-resistant steel and smelting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The special slag system for Cr12 is: in terms of mass fraction, CaF 2 Content 45%, Al 2 o 3 Content 10%, CaO content 30%, SiO 2 Content 5%, MgO content 10%;

[0067] Electroslag remelting conditions for Cr12 steel using the above slag system: Prepare the electroslag remelting slag system according to the above ratio, bake, crush and stir evenly, dry, take it 10 minutes before melting; dry boron oxide separately and add slag system separately; electrode The oxygen content is below 30ppm; the electrode is polished to keep the surface clean, dry, rust-free and oil-free; the electroslag remelting is protected by a mixture of high-purity argon (purity 98%) and nitrogen (purity 98%), and the mixing ratio is Ar:N 2 =1:1 (flow ratio, m 3 / h), and after deoxidation and dehydration treatment, the oxygen concentration in the smelting atmosphere is below 150ppm.

[0068] Use Cr12 special slag system to produce three 100kg electroslag ingots: the rate of heat compliance is 100%...

Embodiment 2

[0072] The P91 special slag system used is: in terms of mass fraction, CaF 2 Content 40%, Al 2 o 3 Content 30%, CaO content 15%, SiO 2 Content 10%, MgO content 5%;

[0073] Electroslag remelting conditions for P91 steel using the above slag system: prepare the electroslag remelting slag system according to the above ratio, bake, crush and stir evenly, dry, take it 10 minutes before melting; dry boron oxide separately and add slag system separately; electrode The oxygen content is less than 30ppm; the electrode is polished to keep the surface clean, dry, rust-free and oil-free; the electroslag remelting is protected by a mixture of high-purity argon (98%) and nitrogen (98%), and the mixing ratio is Ar:N2=9: 1 (flow ratio, m 3 / h), and after deoxidation and dehydration treatment, the oxygen concentration in the smelting atmosphere is below 150ppm.

[0074] Use P91 special slag system to produce three 100kg electroslag ingots: the rate of heat compliance is 100%, T.O≤25ppm, ...

Embodiment 3

[0078] The special slag system for FB2 is: in terms of mass fraction, CaF 2 Content 50%, Al 2 o 3 Content 10%, CaO content 10%, SiO 2 content 20%, MgO content 5%, B 2 o 3 Content 5%;

[0079] Electroslag remelting conditions for FB2 steel using the above slag system: prepare the electroslag remelting slag system according to the above ratio, bake, crush and stir evenly, dry, take it 10 minutes before melting; dry boron oxide separately and add slag system separately; electrode The oxygen content is below 30ppm; the electrode is polished to keep the surface clean, dry, rust-free and oil-free; the electroslag remelting is protected by a mixture of high-purity argon (98%) and nitrogen (98%), and the mixing ratio is Ar:N 2 =1:1 (flow ratio, m 3 / h), and after deoxidation and dehydration treatment, the oxygen concentration in the smelting atmosphere is below 150ppm.

[0080] Use FB2 special slag system to produce three 100kg electroslag ingots: the rate of heat compliance is...

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Abstract

The invention relates to an electroslag remelting slag system of high-alloy heat-resistant steel and a smelting method. The electroslag remelting slag system comprises the following components in percentage by mass: 40-80% of CaF2, 10-20% of MgF2, 5-20% of MgF2, 5-20% of MgF2 10% to 30% of Al2O3; 10% to 30% of CaO; 0 to 20 percent of SiO2; 0 to 15% of MgO; and 0 to 5 percent of B2O3. The smelting method adopting the electroslag remelting slag system specifically comprises the following steps that S1, the electroslag remelting slag system is prepared according to the proportion, crushed, stirred to be uniform and dried, and the electroslag remelting slag system is taken 10 min before smelting; and S2, electroslag remelting adopts a smelting atmosphere for protection, the smelting atmosphere is a mixed gas of Ar and N2, and the oxygen concentration in the smelting atmosphere is 150 ppm or below. According to the electroslag remelting slag system of the high-alloy heat-resistant steel, the slag system formula and the electroslag smelting process can control the components Al, Si, B, N and O which are difficult to control in the steel ingot within the specified range, and the components in the steel ingot are more uniform.

Description

technical field [0001] The invention belongs to the field of metal smelting, and in particular relates to an electroslag remelting slag system of high-alloy heat-resistant steel and a smelting method. Background technique [0002] With the development of the electric power industry and the increasing global concern for environmental issues, saving primary energy, strengthening environmental protection, reducing harmful exhaust emissions, and reducing the global warming effect have attracted great attention at home and abroad. Improving the thermal efficiency of thermal power units and adopting supercritical and ultra-supercritical units is one of the effective ways to prevent environmental pollution. With the rapid development of supercritical and ultra-supercritical thermal power units in China, new materials and new processes are emerging, and high-alloy heat-resistant steels such as P91, P92, FB2, and Cr12 are widely used. [0003] Electroslag remelting is an important s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18
CPCC22B9/18
Inventor 刘喜海李杰刘实
Owner 沈阳金正冶金技术有限公司