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Electroslag remelting method for high-purity austenite nitrogenous stainless steel for nuclear power

An electroslag remelting and austenite technology, applied in the field of metallurgy, can solve the problems of material flaw detection performance, low pass rate of hydraulic test of mechanical properties, etc. Effect

Active Publication Date: 2015-07-22
沈阳科金特种材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem in the prior art that the material flaw detection performance, mechanical performance and the pass rate of the hydraulic test after welding are low due to the uncontrollable content of inclusions. After repeated tests and researches, it provides a kind of Electroslag remelting method for high-purity austenitic nitrogen-containing stainless steel

Method used

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  • Electroslag remelting method for high-purity austenite nitrogenous stainless steel for nuclear power
  • Electroslag remelting method for high-purity austenite nitrogenous stainless steel for nuclear power
  • Electroslag remelting method for high-purity austenite nitrogenous stainless steel for nuclear power

Examples

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Effect test

Embodiment 1

[0035] Electroslag remelting F316LN alloy, the size of the electroslag ingot is Ф700 m / m The ingot weighs 6 tons. Base metal electrode size is Ф430 m / m . The oxygen content of the base metal electrode is 32ppm.

[0036] Electrical parameters: the voltage at the furnace mouth is 80V, the current is 13KA, the insulating base, the total weight of the selected slag system is 200Kg, and the ratio is: CaF 2 58%, Al 2 o 3 20%, CaO 13%, MgO 6%, SiO 2 3%, the slag is baked at 600~800°C, and Si-Ca powder with a weight percentage of 400g of the slag content and Al powder with a weight percentage of 200g of the slag content are added to the slag during the process of slag melting, and the composite deoxidizer is continuously added by an automatic feeder The amount of Si-Ca powder is 0.40%~0.50%, the amount of Al powder is 0.10%~0.15%, and the inert gas (argon gas) after the dryer and molecular sieve treatment is passed through the dryer, and the amount of inflow is 11m 3 / ...

Embodiment 2

[0040] Electroslag remelting Z2CND18-12 (nitrogen control) alloy, the size of the electroslag ingot is Ф700 m / m The ingot weighs 4 tons. Base metal electrode size is Ф400 m / m . The oxygen content of the base metal electrode is 21ppm.

[0041] Table 2 Inclusion results of Z2CND18-12 (nitrogen control) alloy after remelting.

[0042]

Embodiment 3

[0044] Electroslag remelting Z2CN19-10 (nitrogen control) alloy, the size of the electroslag ingot is Ф700 m / m The ingot weighs 5 tons. Base metal electrode size is Ф440 m / m . The oxygen content of the base metal electrode is 18ppm.

[0045] Table 3 Detection results of inclusions in Z2CN19-10 (nitrogen-controlled) alloy after remelting

[0046]

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Abstract

The invention discloses an electroslag remelting method for high-purity austenite nitrogenous stainless steel for nuclear power. The method comprises the following steps: (1) selecting a cylindrical metal electrode for electroslag; (2) treating the metal electrode by adopting a machining method; (3) carrying out welding treatment and heating treatment on the metal electrode and a stainless-steel false electrode for the electroslag; (4) carrying out slag melting treatment by selecting a slag system which contains 50%-60% (by weight) of CaF2, 15%-25% (by weight) of Al2O3, 10%-20% (by weight) of CaO, 5%-10% (by weight) of MgO and 3%-6% (by weight) of SiO2; (6) carrying out feeding treatment; (7) carrying out die cooling. According to the austenite nitrogenous stainless steel prepared by the method, the forming of a steel ingot surface is good, and the inclusion content is low and can reach that the inclusion content of a coarse series of a class A is not higher than 0.5, the inclusion content of a fine series of the class A is not higher than 0.5, the inclusion content of a coarse series of a class B is not higher than 0.5, the inclusion content of a fine series of the class B is not higher than 0.5, the inclusion content of a coarse series of a class C is not higher than 0.5, the inclusion content of a fine series of the class C is not higher than 0.5, the inclusion content of a coarse series of a class D is not higher than 0.5, and the inclusion content of a fine series of the class D is not higher than 1.0.

Description

technical field [0001] The invention relates to an electroslag remelting method for austenitic nitrogen-containing stainless steel, in particular to an electroslag remelting method for high-purity austenitic nitrogen-containing stainless steel used in nuclear power, and belongs to the technical field of metallurgy. Background technique [0002] CAP1400 refers to the advanced passive nuclear power technology with an installed capacity of 1.4 million kilowatts. It is the third-generation nuclear power technology with independent intellectual property rights clearly proposed in my country's "National Medium and Long-term Science and Technology Development Program Outline". The CAP1400 project aims to form a large-scale advanced pressurized water pump with independent intellectual property rights in my country, greater power, higher safety and longer life on the basis of the current AP1000 technology with better safety and economy, through digestion, absorption and re-innovation ...

Claims

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Application Information

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IPC IPC(8): C22B9/18C21C7/06
Inventor 文长春赵忠刚栾威威林静刘莹贾伟杨功斌金艳阳
Owner 沈阳科金特种材料有限公司
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