CN102758096B - Process for preparing nickel-based high-temperature alloy material for nuclear power plant flow restrictor - Google Patents
Process for preparing nickel-based high-temperature alloy material for nuclear power plant flow restrictor Download PDFInfo
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Abstract
The invention provides a process for preparing a nickel-based high-temperature alloy material for a nuclear power plant flow restrictor. According to the process, the nickel-based high-temperature alloy material is prepared through steps of raw material preparation, vacuum induction melting, inoculant addition, vacuum pouring and secondary refining. By the aid of the process, the purity of steel ingots is improved, the content of nonmetal impurities and gases in steel ingots is also reduced, and the prepared nickel-based high-temperature alloy material completely conforms to requirements of American Society of Mechanical Engineers (ASME) standards, so that the nuclear power plant flow restrictor is reliable in quality and safe to use.
Description
Technical field
The invention belongs to technical field of metal material preparation, particularly a kind of Nuclear power plants flow restrictor preparation method of nickel-base high-temperature alloy material.
Background technology
High temperature alloy is mainly used on the key part of Aeronautics and Astronautics and Nuclear power plants, and the purity of its mechanical property to material, material requires very high.The Chemical Composition element of high temperature alloy is more, and it contains a large amount of easily oxidation elements, and is very strict to the requirement of impurity element and gas content.Therefore, when the preparation high temperature alloy, must select fine fodder for use, namely the content of the sulphur in the raw material, phosphorus, lead, tin, arsenic, antimony, bismuth and gas is low, and rustless, no greasy dirt.
In the high temperature alloy, be used for that the Nuclear power plants flow restrictor uses nickel-base high-temperature alloy material, adopt electric arc furnace and common casting ingot process to be prepared from usually, its stove is molten big in batches, the cost of equipment less investment, good to the sweetening effectiveness of high alkalinity slag, and can use returns etc.But it is wayward owing to its alloying constituent (more active element) scaling loss, cause the alloy gas content higher, deoxidation products is residued in the steel in a large number, the refractory materials of furnace lining and steel teeming ladle easily makes alloy be polluted simultaneously, secondary oxidation easily takes place in the process of cast, causes in the steel to form to be mingled with bubble etc.
Summary of the invention
Purpose of the present invention, be the problems that exist in sum the nickel-base high-temperature alloy material of decide prepared with conventional electric arc furnace and common casting, providing a kind of is the preparation method that the Nuclear power plants flow restrictor of principal feature is used nickel-base high-temperature alloy material with vacuum induction melting, adding alterant.
Nuclear power plants flow restrictor of the present invention comprises that with the preparation method of nickel-base high-temperature alloy material starting material preparation, vacuum induction melting, adding alterant, vacuum pouring, secondary refining step are prepared from.This preparation method's step is as described below:
A, starting material prepare: selected S, P, B, Co, As, Sn, Sb, Cu, the high-quality raw material that the Pb constituent content is low, its selected raw-material chemical component weight per-cent Ying Full is enough to require down: S≤0.010%, P≤0.015%, B≤0.005%, Co≤0.05%, As≤0.001%, Sn≤0.0025%, Sb≤0.0025%, Cu≤0.05%, Pb≤0.0025%.
B, vacuum induction melting: the starting material of preparing are divided in three crucibles of packing into, pack into for the first time and namely close bell behind 75～80% the starting material, vacuum tightness is evacuated to 0.1～0.6Pa, treat energising fusing 70～80% after, pack into for the second time again 10～15% starting material, to starting material all fusing finish.When the measurement liquid steel temperature is 1590～1620 ℃, adding 5～10% starting material for the third time makes microalloying and adjusts the molten steel chemical ingredients, make the Chong amount Bai Fen of its chemical ingredients state requirement: C0.05～0.030%, Cr28.0～31.0%, Fe7.0～11%, Ni 〉=58.0%, S≤0.005%, P≤0.008%, B≤0.003%, Co≤0.03%, Al≤0.32%, N≤0.04%, Mg≤0.005%, Ti≤0.15%, Ta≤0.01% Bi the Full foot, liquid steel temperature is controlled to be 1610～1620 ℃.
C, adding alterant: behind the vacuum induction melting, in molten steel, add 0.05～0.15% rare earth and make alterant, it can accelerate a large amount of formation of the molten steel nuclei of crystallization, improve the nucleation rate of molten steel, be core with the alterant to around expansion form many and thin original grain, improve the original grain degree of steel ingot.Described alterant is group of the lanthanides or actinium series rare earth material.
D, vacuum pouring: alterant added after 3～5 minutes, i.e. it is 45～55 seconds that steel tapping casting, teeming temperature are controlled to be 1580～1610 ℃, time.
E, secondary refining: adopt conventional electroslag remelting technology after vacuum pouring finishes, namely finish the preparation of described nickel-base high-temperature alloy material.
The Nuclear power plants flow restrictor of the present invention preparation method of nickel-base high-temperature alloy material, not only improve the purity of steel ingot, and the non-metallic inclusion in the reduction steel ingot and gas content, make the nickel-base high-temperature alloy material of preparation meet the requirement of ASME standard fully, thereby guarantee Nuclear power plants flow restrictor reliable in quality, use safety.
Embodiment
Below Nuclear power plants flow restrictor of the present invention is done further narration with the preparation method of nickel-base high-temperature alloy material.
Nuclear power plants flow restrictor of the present invention comprises starting material preparation, vacuum induction melting, adding alterant, vacuum pouring, secondary refining step with the preparation method of nickel-base high-temperature alloy material.
For verifying preparation method's of the present invention exploitativeness, enumerate following example and be used for explanation the present invention, limit the scope of the invention and be not used in, its concrete operations step is undertaken by the example of following selection:
A, starting material prepare: selected S, P, B, Co, As, Sn, Sb, Cu, the high-quality raw material that the Pb constituent content is low, the weight percent of its selected raw-material chemical ingredients is selected example wherein: S0.010%, P0.012%, B0.003%, Co0.03%, As0.001%, Sn0.002%, Sb0.0023%, Cu0.03%, Pb0.0022%.
B, vacuum induction melting: the starting material of preparing are divided in three crucibles of packing into, pack into for the first time and namely close bell behind 80% the starting material, vacuum tightness is evacuated to 0.5Pa, treat energising fusing 80% after, pack into for the second time again 15% starting material, to starting material all fusing finish.When the measurement liquid steel temperature is 1600 ℃, adding 5% starting material for the third time makes microalloying and adjusts the molten steel chemical ingredients, make the Chong amount Bai Fen of its chemical ingredients state requirement: C0.025%, Cr30.0%, Fe10.0%, Ni61.0%, S0.005%, P0.008%, B0.003%, Co0.03%, Al0.32%, N0.04%, Mg0.005%, Ti0.15%, Ta0.01% Bi the Full foot, liquid steel temperature is controlled to be 1620 ℃.
C, adding alterant: behind the vacuum induction melting, the rare earth of adding 0.15% is made alterant in molten steel, and alterant is group of the lanthanides or actinium series rare earth material.
D, vacuum pouring: alterant added after 3～5 minutes, i.e. it is 50 seconds that steel tapping casting, teeming temperature are controlled to be 1600 ℃, time.
E, secondary refining: adopt conventional electroslag remelting technology after vacuum pouring finishes, namely finish the preparation of described nickel-base high-temperature alloy material.
Claims (2)
1. a Nuclear power plants flow restrictor is with the preparation method of nickel-base high-temperature alloy material, it is characterized in that described nickel-base high-temperature alloy material adopts starting material preparation, vacuum induction melting, adding alterant, vacuum pouring, secondary refining step to be prepared from, this preparation method may further comprise the steps:
A, starting material are prepared, selected S, P, B, Co, As, Sn, Sb, Cu, the high-quality raw material that the Pb constituent content is low, its selected raw-material chemical component weight per-cent Ying Full is enough to require down: S≤0.010%, P≤0.015%, B≤0.005%, Co≤0.05%, As≤0.001%, Sn≤0.0025%, Sb≤0.0025%, Cu≤0.05%, Pb≤0.0025%
B, vacuum induction melting, the starting material of preparing are divided in three crucibles of packing into, pack into for the first time and namely close bell behind 75～80% the starting material, vacuum tightness is evacuated to 0.1～0.6Pa, after treating energising fusing 70～80%, pack into for the second time again 10～15% starting material, to starting material all fusing finish, when the measurement liquid steel temperature is 1590～1620 ℃, adding 5～10% starting material for the third time makes microalloying and adjusts the molten steel chemical ingredients, make the Chong amount Bai Fen of its chemical ingredients state requirement: C0.05～0.030% Bi the Full foot, Cr28.0～31.0%, Fe7.0～11%, Ni 〉=58.0%, S≤0.005%, P≤0.008%, B≤0.003%, Co≤0.03%, Al≤0.32%, N≤0.04%, Mg≤0.005%, Ti≤0.15%, Ta≤0.01%, liquid steel temperature is controlled to be 1610～1620 ℃
C, add alterant, behind the vacuum induction melting, in molten steel, add 0.05～0.15% rare earth and make alterant,
D, vacuum pouring, alterant added after 3～5 minutes, i.e. it is 45～55 seconds that steel tapping casting, teeming temperature are controlled to be 1580～1610 ℃, time,
Adopt conventional electroslag remelting technology after e, secondary refining, vacuum pouring finish, namely finish the preparation of described nickel-base high-temperature alloy material.
2. preparation method according to claim 1 is characterized in that described alterant is group of the lanthanides or actinium series rare earth material.
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| CN103014388B (en) * | 2012-12-26 | 2014-12-10 | 中国科学院金属研究所 | Large-tonnage low-cost ultraclean melting method of producing Inconel690 alloy |
| CN103556003A (en) * | 2013-09-27 | 2014-02-05 | 贵州航天新力铸锻有限责任公司 | Preparation method for nickel-based alloy used for nuclear power station equipment parts |
| CN106544532B (en) * | 2016-11-11 | 2018-06-12 | 太原钢铁(集团)有限公司 | Vacuum induction controls the method for content of magnesium and the method for preparing nickel base superalloy in nickel base superalloy in smelting |
| CN113878261A (en) * | 2021-09-06 | 2022-01-04 | 贵州航天新力科技有限公司 | Nickel-based high-temperature alloy welding material and preparation method thereof |
| CN113737057A (en) * | 2021-09-06 | 2021-12-03 | 贵州航天新力科技有限公司 | Preparation method of nuclear-grade nickel-based high-temperature alloy welding wire material |
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| WO2009142228A1 (en) * | 2008-05-22 | 2009-11-26 | 住友金属工業株式会社 | High-strength ni-base alloy pipe for use in nuclear power plants and process for production thereof |
| CN102066594B (en) * | 2008-06-16 | 2013-03-27 | 住友金属工业株式会社 | Heat-resistant austenitic alloy, heat-resistant pressure-resistant member comprising the alloy, and process for producing the same |
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