CN102181752A - Hand hole sealing cover spring material for steam generator of nuclear power plant and preparation method of hand hole sealing cover spring material - Google Patents
Hand hole sealing cover spring material for steam generator of nuclear power plant and preparation method of hand hole sealing cover spring material Download PDFInfo
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Abstract
The invention discloses a hand hole sealing cover spring material for a steam generator of a nuclear power plant and a preparation method of the hand hole sealing cover spring material. The hand hole sealing cover spring material comprises the following components in percentage by weight: 0.003-0.08% of C (Carbon), 0.05-0.35% of Si (Silicon), 0.05-0.35% of Mn (Manganese), not more than 0.015% of P (Phosphorus), not more than 0.015% of S (Sulfur), 17.0-21.0% of Cr (Chromium), 50-55% of Ni (Nickel), 0.005-0.10% of Cu (Copper), 0.65-1.15% of Ti (Titanium), 0.20-0.80% of Al (Aluminum), 2.80-3.30% of Mo (Molybdenum), 4.75-5.50% of Nb (Niobium), 0.006% of B (Boron) and the balance of Fe (Ferrum) and inevitable impurities. The preparation method comprises the steps of smelting, forging, hot rolling, normalizing, mold drawing and the like. The spring material has the advantages of excellent corrosion resistance, fatigue resistance, creep resistance, processability, tensile strength of up to 1340 MPa, yield strength of up to 1060 MPa and elongation A of 20%.
Description
Technical field
The present invention relates to a kind of hand hole closing cover spring material of new material technology field, particularly a kind of nuclear power station steam generator hand hole closing cover spring material and preparation method thereof.Be specifically related to a kind of UNS NO7718 material, be mainly used in pressurized-water reactor nuclear island CPR1000 vapour generator hand hole closing cover spring material.
Background technology
Vapour generator is the hinge of pressurized-water reactor nuclear power plant one loop and secondary circuit, is the barrier of cutting apart the medium of a loop and secondary circuit, is one of Nuclear power plants key equipment.A Nuclear power plants need be provided with several vapour generators, include ten hundreds of heat-transfer pipes, tube sheet is the brace foundation of heating surface bank, constitutes the boundary of vapour generator first and second side with heat-transfer pipe, and tube sheet secondary side near surface is one of concentrated area of heat-transfer pipe generation corrosion accident.It is reliable to be perfectly safe in order to ensure the heat-transfer pipe operation, is provided with several inspection hand holes at cylindrical shell near the tube sheet place, in order to check tube surface and tube sheet secondary side surface.Hand hole closing cover is used to cover and seal hand hole, adopt flange to add the gasket structure in the prior art, the available technology adopting spring is reciprocating, to cover and to seal hand hole, adopt spring sealed hand hole, make its good seal performance, easy to use, improve natural frequency simultaneously, prevent to be in operation and damage because of vibration causes heating surface bank.
Vapour generator is to use under high temperature, high pressure, strong corrosive environment with the hand hole closing cover spring, and high temperature strength, erosion resistance, antifatigue, creep resistance and the workability of making the hand hole closing cover spring material proposed strict demand.Present China's material dependence on import still of being used to make the hand hole closing cover spring, therefore research and develop and make hand hole closing cover spring material with superior corrosion resistance, antifatigue, creep resistance and workability, to substitute import, reduce the generation of vapour generator fault, the economy and the safe reliability of effective raising Nuclear power plants had crucial meaning.
Summary of the invention
The objective of the invention is to overcome existing vapour generator with the deficiency in the hand hole closing cover spring material technology, a kind of " nuclear power station steam generator hand hole closing cover spring material and preparation method thereof " is provided.This capping spring material is used to make nuclear power station steam generator hand hole closing cover spring, and this material price is low, design of components is reasonable, manufacturing process is simple, has superior corrosion resistance, antifatigue, creep resistance and processability.Its tensile strength can reach 1340MPa, and yield strength can reach 1060 MPa, and elongation A is 20%.
To achieve these goals, the present invention is achieved through the following technical solutions: a kind of nuclear power station steam generator hand hole closing cover spring material, to count by weight percentage, and ingredient is as follows:
C：0.003-0.08%； Si：0.05-0.35%?； Mn： 0.05-0.35%；
P：≤0.015%； S：?≤0.015%； Cr： 17.0-21.0%；
Ni：50-55%； Cu：0.005-0.10%； Ti： 0.65-1.15%；
Al：0.20-0.80%； Mo：2.80-3.30%； Nb： 4.75-5.50%；
B：≤0.006%；
Surplus is Fe and is unavoidable impurities.
The described Si of its raw material in the spring material, Mn, Cr, Ni, Cu, Ti, Al, Mo, Nb, Fe, purity greater than 98.5%.
A kind of nuclear power station steam generator preparation method of hand hole closing cover spring material, described preparation method comprises steps such as melting, forging, hot rolling, normalizing, mould drawing, concrete steps are as follows:
1) carry out preparation of raw material by the weight percent meter calculation of hand hole closing cover spring material ingredient:
C：0.003-0.08%； Si：0.05-0.35%?； Mn： 0.05-0.35%；
P：≤0.015%； S：?≤0.015%； Cr： 17.0-21.0%；
Ni：50-55%； Cu：0.005-0.10%； Ti： 0.65-1.15%；
Al：0.20-0.80%； Mo：2.80-3.30%； Nb： 4.75-5.50%；
B：≤0.006%；
Surplus is Fe and is unavoidable impurities.
2) will pack into by the raw material of aforementioned preparation and smelt in the vacuum refining furnace, refining period, temperature was controlled at 1500
0C～1560
0C, refining time 30 minutes;
3) electroslag refining, refining period, temperature was controlled at 1500
0C～1560
0C, melting voltage 45-50V,
Melting electric current 2600-3000A;
4) forge forging temperature 1170
0C-950
0C opens and forges temperature 1160
0C;
5) hot rolling, hot-rolled temperature 1170
0C-950
0C, start rolling temperature 1150
0C;
6) normalizing, normalizing temperature 950
0C – 1080
0C, 1.5 hours air cooling time;
7) multi-pass carries out drawing → annealing → drawing, obtains hand hole closing cover spring material finished product.
Drawing described in the step 7) adopts bicycle to carry out at a slow speed.
Annealing described in the step 7), its annealing temperature are 950
0C-1080
0C, annealing insulation 1 hour.
The raw material of the preparation step 2) is packed into and is smelted in the vacuum refining furnace, its loading sequence is: carbon C-iron Fe-chromium Cr-nickel-silicon Si-manganese Mn-niobium Nb-molybdenum Mo-copper Cu-aluminium Al-titanium Ti-boron stirs coming out of the stove in preceding 5 minutes mishmetal once added in the molten steel.
Describedly mishmetal is once added in the molten steel in preceding 5 minutes coming out of the stove, its mishmetal is La, Ce mishmetal, counts by weight percentage, the mishmetal ingredient that is added is 0.01-1.0%, in this mishmetal, described La ingredient is 35%, and the Ce ingredient is 65%.
These invention preparation method major technique characteristics are: adopt vacuum refining furnace to smelt, make the degassing fully, again through electroslag refining, make the molten steel cleaning, mishmetal adds further raising capping spring material quality and mechanical property in the vacuum metling process, the process annealing of drawing process, drawing adopts bicycle to carry out at a slow speed, the heat accumulation that is produced when reducing friction, finally obtaining it draws intensity can reach 1340MPa, yield strength can reach 1060 MPa, and elongation A is 20% hand hole closing cover spring material.
Nuclear power station steam generator of the present invention is as follows with the principle of the designed composition of hand hole closing cover spring material:
. C: very effective sclerosis and solution strengthening constituent element, stablize martensitic structure, proof strength.But usually occur as formation of crack, form crisp sclerous tissues easily and cause delayed cracking as too high levels, its composition weight % is limited in 0.003-0.08%;
Mn: deoxidation and desulfidation, guarantee the important element of oxidation-resistance, less than 0.01% can not obtain abundant deoxidation, surpasses 1.5% intensity and reduces, and its composition weight % is limited in 0.05-0.35%;
Si: deoxidation, raising yield strength, high-temperature corrosion resistance, less than 0.01% can not obtain abundant oxidation-resistance, surpasses 0.90% toughness and reduces, and its composition weight % is limited in 0.05-0.35%;
Ni: improve toughness of material, the raising of intensity is also had contribution, its composition weight % is limited in 50-55%;
Cr: guarantee oxidation-resistance, high-temperature corrosion resistance, improve the indispensable element of hot strength, content is low excessively, can not manifest effect, too high levels, and intensity and toughness significantly reduce, and its composition weight % is limited in 17.0-21.0%;
Cu: improve the solidity to corrosion to non-oxidizing acid in material, its composition weight % is limited in 0.005-0.10%;
Al: be added as reductor, its composition weight % is limited in 0.20-0.80%;
Ti: improve corrosion resistance in material, its composition weight % is limited in 0.65-1.15%;
S, P: be inevitable detrimental impurity element in the material, its content is low more good more, its composition weight %, and P :≤0.015%, S :≤0.015%;
Mo: add molybdenum in the alloy and can improve its hot strength, wear resistance and erosion resistance, its composition weight % is limited in 2.80-3.30%;
Nb: the fusing point height, can improve the intensity and the plasticity of alloy, crystal grain thinning improves the toughness of alloy and increases alloy rigidity, can improve room temperature and high temperature tensile strength, yield strength and creep rupture strength.Its composition weight % is limited in 4.75-5.50%;
B: boron is active especially when high temperature, therefore be used to do the high temperature robustness of metallurgical degasifier, increase alloy material, because boron has low density, high strength and dystectic character, adding trace B in the alloy and can improve the hot strength of alloy material, its composition weight % is limited in≤and 0.006%;
Mishmetal: producing and middle adding rare earth, with Cr, has good oxidation-resistance under the compound action of Si, rare earth is the strong reducing property element, rare earth and sulphur have very big avidity, in bath, not only has desoxydatoin, also has the size that obvious desulfurization improves sulfide inclusion, form and distribution effect, reduce the inclusion content in the material, can change the composition of inclusion, form, distribute and character, suppress the segregation of these inclusiones in crystal boundary, thereby the various performances of material have been improved, as toughness, weldability, composition weight % is limited in 0.01-1.0% among the present invention.
Adopt the nuclear power station steam generator of the designed manufacturing of the present invention to use the hand hole closing cover spring material compared with prior art, have following advantage:
1. composition is reasonable in design, cost is low, safe and reliable;
2. its tensile strength of this capping spring material can reach 1340MPa, and yield strength can reach 1060 MPa, and elongation A is 20%, 1100
0Long term operation has higher-strength and corrosion resistance under the C high temperature, its high temperature stress intensity stabilization;
3. again because of having added micro-mishmetal and having adopted special preparation technology, guarantee that material has superior corrosion resistance, antifatigue, creep resistance and processability;
4. this vapour generator is guaranteed the safe reliability that the Nuclear power plants operation is used with the alternative import of hand hole closing cover spring material, effectively prolongs the work-ing life of nuclear power station steam generator, reduces cost, and significantly improves economic benefit.
Description of drawings
Fig. 1 is that mechanical properties test result of the present invention reaches and subordinate list is compared in UNS NO7718 technical requirements.
Embodiment
Below by non-limiting example, further set forth the present invention, understand the present invention.
Nuclear power station steam generator of the present invention has prepared five stove embodiment with the hand hole closing cover spring material, heat (batch) number is: 105-5289,5290,5291,5292,5293, embodiment 1-5 stove hand hole closing cover spring material ingredient and content % by weight calculate, auspicious see as follows:
The first stove 105-5289:C:0.02%, Si:0.15%, Mn:0.15%, P:0.012%, S:0.008%,
Cr:18%, Ni:52%, Al:0.50%, Ti:0.80%, Cu:0.07%, Mo:2.9, Nb:4.90, B:0.003%, mishmetal: 0.15%, Fe:20.3%.
Second stove: 105-5290:C:0.025%, Si:0.10%, Mn:0.20%, P:0.010%, S:0.007%, Cr:18.5%, Ni:52.5%, Al:0.60%, Ti:0.90%, Cu:0.08%, Mo:2.92, Nb:4.95, B:0.004%, mishmetal: 0.20%, Fe:19.0%.
The 3rd stove: 105-5291:C:0.030%, Si:0.20%, Mn:0.25%, P:0.011%, S:0.006%, Cr:19%, Ni:53%, Al:0.65%, Ti:0.90%, Cu:0.05%, Mo:3.0, Nb:5.0, B:0.005%, mishmetal: 0.70%, Fe:16.8%.
The 4th stove: 105-5292:C:0.035%, Si:0.17%, Mn:0.18%, P:0.01%, S:0.005%, Cr:19.5%, Ni:53.5%, Al:0.70%, Ti:1.00%, Cu:0.06%, Mo:3.1, Nb:5.1, B:0.002%, mishmetal: 0.18%, Fe:16.4%.
The 5th stove: 105-5293:C:0.040%, Si:0.25%, Mn:0.23%, P:0.013%, S:0.008%, Cr:18.3%, Ni:54%, Al:0.75%, Ti:0.95%, Cu:0.09%, Mo:3.0, Nb:5.2, B:0.003%, mishmetal: 0.8%, Fe:16.3%.
Above-mentioned five stove embodiment its preparation methods are:
1). select pure iron for use, prepare burden according to the present invention's five stove embodiment design mix;
2). vacuum refining furnace is smelted, feed by its loading sequence: carbon C-iron Fe-chromium Cr-nickel-silicon Si-manganese Mn-niobium Nb-molybdenum Mo-copper Cu-aluminium Al-titanium Ti-boron, stir coming out of the stove in preceding 5 minutes mishmetal once added in the molten steel, smelting temperature is controlled at 1500
0C～1560
0C, refining time 30 minutes;
3). electroslag refining, refining period, temperature was controlled at 1500
0C～1560
0C, melting voltage 45-50V,
Melting electric current 2600-3000A;
4). forge forging temperature 1170
0C-950
0C opens and forges temperature 1160
0C;
5). hot rolling, hot-rolled temperature 1060
0C-900
0C, start rolling temperature 1060
0C
6). normalizing, normalizing temperature 720
0C-780
0C, 1.5 hours air cooling time;
7). its annealing temperature of multi-pass (drawing-annealing-drawing) process annealing is 950
0C-1080
0C, annealing insulation 1 hour.。
Drawing employing bicycle (10 meters/minute of speed) at a slow speed carries out, and according to customer need, drawing passes is
ф14-12.5-12-11.5-11.0-10.2。
Above embodiment is designed, the nuclear power station steam generator of preparation with the hand hole closing cover spring material relevant department its composition, comprehensive mechanical property have been carried out detection, test, examining report is as follows:
One. Stainless Steel Products quality supervision and test center, Jiangsu Province
Mechanical property
Sample title: UNS NO7718((the present invention)
Specifications and models: UNS NO7718(the present invention) unit's rod, ф 10mm, 1 * 300mm.
Sample state: meet survey requirement;
CMT5305 (0.5 grade) microcomputer control electronics universal testing machine;
Test basis: GB/T228-2002 " metallic substance tensile test at room temperature method ".
Assay: see attached list
Two. to the test of hand hole closing cover spring trial-production part, evaluation result: according to hand hole closing cover spring trial-production part test and evaluation situation analysis, above-mentioned hand hole closing cover spring material UNS NO7718(the present invention) satisfy the every technical requirements of vapour generator with the hand hole closing cover spring, manufacturing process and product is stable.
Detect by above embodiment and mechanical property, the nuclear power station steam generator of the designed preparation of the present invention has with the hand hole closing cover spring material that composition is reasonable in design, cost is low, stable manufacturing process, have superior corrosion resistance, antifatigue, creep resistance and processability, satisfy the every use technology index request of nuclear power station steam generator, guarantee safe and reliable with the hand hole closing cover spring.To enhancing productivity, effectively prolong the work-ing life of nuclear power station steam generator, reducing production costs has crucial economic implications.
Claims (7)
1. nuclear power station steam generator hand hole closing cover spring material is characterized in that count by weight percentage, ingredient is as follows:
C：0.003-0.08%； Si：0.05-0.35%?； Mn： 0.05-0.35%；
P：≤0.015%； S：?≤0.015%； Cr： 17.0-21.0%；
Ni：50-55%； Cu：0.005-0.10%； Ti： 0.65-1.15%；
Al：0.20-0.80%； Mo：2.80-3.30%； Nb： 4.75-5.50%；
B：≤0.006%；
Surplus is Fe and is unavoidable impurities.
2. a kind of nuclear power station steam generator hand hole closing cover spring material according to claim 1 is characterized in that, the described Si of its raw material in the spring material, Mn, Cr, Ni, Cu, Ti, Al, Mo, Nb, Fe, purity greater than 98.5%.
3. the preparation method of an a kind of nuclear power station steam generator usefulness hand hole closing cover spring material as claimed in claim 1 is characterized in that described preparation method comprises steps such as melting, forging, hot rolling, normalizing, mould drawing, and concrete steps are as follows:
1) carry out preparation of raw material by the weight percent meter calculation of hand hole closing cover spring material ingredient:
C：0.003-0.08%； Si：0.05-0.35%?； Mn： 0.05-0.35%；
P：≤0.015%； S：?≤0.015%； Cr： 17.0-21.0%；
Ni：50-55%； Cu：0.005-0.10%； Ti： 0.65-1.15%；
Al：0.20-0.80%； Mo：2.80-3.30%； Nb： 4.75-5.50%；
B：≤0.006%；
Surplus is Fe and is unavoidable impurities;
2) will pack into by the raw material of aforementioned preparation and smelt in the vacuum refining furnace, refining period, temperature was controlled at 1500
0C～1560
0C, refining time 30 minutes;
3) electroslag refining, refining period, temperature was controlled at 1500
0C～1560
0C, melting voltage 45-50V,
Melting electric current 2600-3000A;
4) forge forging temperature 1170
0C-950
0C opens and forges temperature 1160
0C;
5) hot rolling, hot-rolled temperature 1170
0C-950
0C, start rolling temperature 1150
0C;
6) normalizing, normalizing temperature 950
0C – 1080
0C, 1.5 hours air cooling time;
7) multi-pass carries out drawing → annealing → drawing, obtains hand hole closing cover spring material finished product.
4. a kind of nuclear power station steam generator according to claim 3 is characterized in that with the preparation method of hand hole closing cover spring material the drawing described in the step 7) adopts bicycle to carry out at a slow speed.
5. a kind of nuclear power station steam generator according to claim 3 is characterized in that with the preparation method of hand hole closing cover spring material, the annealing described in the step 7), and its annealing temperature is 950
0C-1080
0C, annealing insulation 1 hour.
6. a kind of nuclear power station steam generator according to claim 3 preparation method of hand hole closing cover spring material, it is characterized in that, the raw material of the preparation step 2) is packed into and is smelted in the vacuum refining furnace, its loading sequence is: carbon C-iron Fe-chromium Cr-nickel-silicon Si-manganese Mn-niobium Nb-molybdenum Mo-copper Cu-aluminium Al-titanium Ti-boron stirs coming out of the stove in preceding 5 minutes mishmetal once added in the molten steel.
7. a kind of nuclear power station steam generator according to claim 6 preparation method of hand hole closing cover spring material, describedly once add mishmetal in the molten steel in preceding 5 minutes coming out of the stove, its mishmetal is La, Ce mishmetal, count by weight percentage, the mishmetal ingredient that is added is 0.01-1.0%, in this mishmetal, described La ingredient is 35%, and the Ce ingredient is 65%.
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| CN104379787A (en) * | 2012-06-20 | 2015-02-25 | 新日铁住金株式会社 | Austenitic alloy tube |
| WO2016123715A1 (en) * | 2015-02-06 | 2016-08-11 | Atomic Energy Of Canada Limited / Énergie Atomique Du Canada Limitée | Nickel-chromium-iron alloys with improved resistance to stress corrosion cracking in nuclear environments |
| CN106279985A (en) * | 2016-08-15 | 2017-01-04 | 合肥万向钱潮汽车零部件有限公司 | Automobile buffer spring material prescription |
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| CN115198143A (en) * | 2021-04-08 | 2022-10-18 | 中国航发商用航空发动机有限责任公司 | Nickel-based alloy and preparation method and application thereof |
| CN115198143B (en) * | 2021-04-08 | 2023-09-26 | 中国航发商用航空发动机有限责任公司 | Nickel-based alloy and preparation method and application thereof |
| CN115961178A (en) * | 2022-11-15 | 2023-04-14 | 重庆材料研究院有限公司 | Ultra-high strength and toughness nickel-based corrosion-resistant alloy |
| CN116987977A (en) * | 2023-09-25 | 2023-11-03 | 安泰科技股份有限公司 | Iron-nickel-based precise alloy material for FMM mask, alloy strip and smelting process |
| CN116987977B (en) * | 2023-09-25 | 2024-01-02 | 安泰科技股份有限公司 | Iron-nickel-based precise alloy material for FMM mask, alloy strip and smelting process |
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Application publication date: 20110914 |