CN101851714A - Shockproof strip end-plate material of vapor generator of nuclear power plant and preparation method thereof - Google Patents
Shockproof strip end-plate material of vapor generator of nuclear power plant and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a shockproof strip end-plate material of a vapor generator of a nuclear power plant and a preparation method thereof, relating to a shockproof strip end-plate material of a vapor generator of a pressurized water reactor nuclear island CPR1000. The shockproof strip end-plate material is prepared from the following components in percentage by weight: 0.003-0.08 percent of C, 0.1-0.4 percent of Si, 0.3-0.8 percent of Mn, not more than 0.015 percent of P, not more than 0.01% of S, 14-17 percent of Cr, 72-78 percent of Ni, 0.05-0.5 percent of Cu, 0.05-0.5 percent of Ti, 0.05-0.5 percent of Al, 6-10 percent of Fe, 0.01-1.0 percent of Xt and the balance of inevitable impurities. The preparation method of the shockproof strip end-plate material comprises the following steps of: preparing raw materials; smelting in a vacuum refining furnace; refining electroslag; forging; thermally rolling; normalizing; and repeating the process of drawing-annealing- drawing) many times to obtain a finished product of shockproof strip end-plate material. The designed shockproof strip end-plate material of the vapor generator of the nuclear power plant has reasonable content design, excellent resistance of corrosion, fatigue and creep properties and processing performance and has very important economic meaning to improve the production efficiency, effectively prolong the service life of the vapor generator of a nuclear power plant and decrease the production cost.
Description
Technical field
The present invention relates to a kind of Shockproof strip end-plate material of new material technology field, particularly a kind of Shockproof strip end-plate material of vapor generator of nuclear power plant and preparation method thereof.Be specifically related to a kind of NC15Fe material, be mainly used in pressurized-water reactor nuclear island CPR1000 Shockproof strip end-plate material of vapor generator, can also be used as shockproof joint pin and shockproof set collar material.
Background technology
Energy industry is the basis of national economy, be the important step of restriction national economy sustained and rapid development, along with development and national economy, people are more and more higher to standard of living and environmental protection requirement, therefore, greatly develop the dominant direction that the nuclear power cause has become current energy development.It is conspicuous that nuclear power is compared its advantage with thermal power generation and other new forms of energy.Vapour generator is the hinge of pressurized-water reactor nuclear power plant one loop and secondary circuit, it is the barrier of cutting apart the medium of a loop and secondary circuit, it is one of Nuclear power plants key equipment, also be one of the maximum equipment that breaks down in the Nuclear power plants device, the serviceability of vapour generator and safe reliability are vital for the safe and stable operation of whole yarn system.A Nuclear power plants need be provided with several vapour generators, includes ten hundreds of heat-transfer pipes, and the high-temperature setting-out flows in tube bank, supplying with water flows with vertical direction along pipe, be heated simultaneously, be vaporized then, steam enters the steam turbine generating, can cause vibrations with these pipe fluid in contact, break because of vibrations can cause damaged tubular, directly cause vapour generator and damage, change a vapour generator and need 200,000,000 dollars of left and right sides expenses, need the shutdown some months, cause great financial loss.For effectively preventing pipe vibrations, be provided with shockproof the nuclear plant safety reliability service played keying action.
Shockproof parts of vapour generator comprise shockproof, Shockproof strip end-plate, shockproof joint pin and shockproof set collar, shockproof parts are to use under high temperature, high pressure, strong corrosive environment, and high temperature strength, erosion resistance, antifatigue, creep resistance and the workability of making shockproof component materials proposed strict demand.China is used to make still dependence on import of Shockproof strip end-plate material at present, therefore research and develop and make Shockproof strip end-plate 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 the deficiency in the existing Shockproof strip end-plate material technology, a kind of " Shockproof strip end-plate material of vapor generator of nuclear power plant and preparation method thereof " is provided.This Shockproof strip end-plate material is used to make the nuclear power station steam generator Shockproof strip end-plate, 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 750MPa, and yield strength can reach 350MPa, and elongation A is 45%.
To achieve these goals, the present invention is achieved through the following technical solutions: a kind of Shockproof strip end-plate material of vapor generator of nuclear power plant, to count by weight percentage, and ingredient is as follows:
C：0.003-0.08％；??Si：0.1-0.4％；??Mn：0.3-0.8％；
P：≤0.015％；?????S：≤0.01％；????Cr：14-17％；
N?i：72-78％；?????Cu：0.05-0.5％；?Ti：0.05-0.5％；
A?l：0.05-0.5％；??Fe：6-10％；?????Xt：0.01-1.0％；
Surplus is a unavoidable impurities.
The purity of Si, Mn, Cr, Ni, Cu, Ti, Al, Fe is greater than 98%, and granularity is 20-50um.
Described rare earth Xt is the mixture of cerium fluoride, lanthanum fluoride, and its purity is greater than 98%, and granularity is 1-10um.
The preparation method of Shockproof strip end-plate material of vapor generator of nuclear power plant of the present invention comprises the steps:
1) carry out preparation of raw material by the weight percent meter calculation of Shockproof strip end-plate material ingredient:
C：0.03-0.08％；?Si：0.1-0.4％；??Mn：0.3-0.8％；
P：≤0.015％；???S：≤0.01％；????Cr：14-17％；
N?i：72-78％；???Cu：0.05-0.5％；?Ti：0.05-0.5％；
Al：0.05-0.5％；?Fe：6-10％；?????Xt：0.01-1.0％；
Surplus is a 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 1520 ℃～1580 ℃, refining time 40 minutes;
3) electroslag refining, refining period, temperature was controlled at 1520 ℃～1580 ℃, melting voltage 45-50V, melting electric current 2600-2800A;
4) forge, 1180 ℃-950 ℃ of forging temperatures are opened and are forged 1180 ℃ of temperature;
5) hot rolling, 1190 ℃-900 ℃ of hot-rolled temperatures, 1190 ℃ of start rolling temperatures;
6) normalizing, 950 ℃-1060 ℃ of normalizing temperatures, 1.5 hours air cooling time;
7) multi-pass carries out drawing → annealing → drawing, obtains the Shockproof strip end-plate material finished product.
Drawing described in the step 7) adopts bicycle to carry out.
Annealing described in the step 7), its annealing temperature are 950 ℃-1050 ℃, 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-pure iron Fe-chromium metal JCr-nickel plate Ni-silicon Si-manganese Mn-copper Cu-aluminium AL-titanium Ti, described rare earth Xt stir coming out of the stove once to add in the molten steel in preceding 5 minutes.
These invention preparation method major technique characteristics are: adopt vacuum refining furnace to smelt, make the degassing fully, through electroslag refining, make the molten steel cleaning again, rare earth Xt adds further raising Shockproof strip end-plate 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, and the heat accumulation that is produced when reducing friction finally obtains its tensile strength and can reach 750MPa, yield strength can reach 350MPa, and elongation A is 45% Shockproof strip end-plate material.
The principle of the designed composition of Shockproof strip end-plate material of vapor generator of nuclear power plant of the present invention is as follows:
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 0.3-0.8%;
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 0.1-0.4%;
Ni: improve toughness of material, the raising of intensity is also had contribution, its composition weight % is limited in 72-78%;
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 14-17%;
Cu: improve the solidity to corrosion to non-oxidizing acid in material, its composition weight % is limited in 0.05-0.5%;
AL: be added as reductor, its composition weight % is limited in 0.05-0.5%;
Ti: improve corrosion resistance in material, its composition weight % is limited in 0.05-0.5%;
S, P: be inevitable detrimental impurity element in the material, its content is low more good more, its composition weight %, P :≤0.015%; S :≤0.01%;
Xt: add rare earth in the material, 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 designed Shockproof strip end-plate material of vapor generator of nuclear power plant of the present invention 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 Shockproof strip material can reach 750MPa, and yield strength can reach 350MPa, and elongation A is 45%, and long term operation has higher-strength and corrosion resistance under 1100 ℃ of high temperature, its high temperature stress intensity stabilization;
3. again because of having added micro-rare earth element and having adopted special preparation technology, guarantee that material has superior corrosion resistance, antifatigue, creep resistance and processability;
4. the safe reliability of shockproof use is guaranteed in the alternative import of this Shockproof strip end-plate material, effectively prolongs the work-ing life of nuclear power station steam generator, reduces cost, and significantly improves economic benefit.
Embodiment
Below by non-limiting example, further set forth the present invention, understand the present invention.
Shockproof strip end-plate material of vapor generator of nuclear power plant of the present invention has prepared four stove embodiment, and heat (batch) number is: 105-5570,5571,5572,5573, embodiment 1-4 stove Shockproof strip end-plate material ingredient and content % by weight calculate, auspicious see as follows:
First stove: C:0.03%, Si:0.3%, Mn:0.7%, P:0.01%, S:0.006%, Cr:15%, Ni:73%, Cu:0.07%, Ti:0.06%, Al:0.4% Fe:6.5%, Xt:0.07%,
Second stove: C:0.05%, Si:0.2%, Mn:0.6%, P:0.009%, S:0.008%, Cr:16%, Ni:74%, Cu:0.12%, Ti:0.12%, Al:0.3% Fe:7.5%, Xt:0.08%,
The 3rd stove: C:0.04%, Si:0.25%, Mn:0.5%, P:0.008%, S:0.007%, Cr:15.5%, Ni:76%, Cu:0.12%, Ti:0.2%, Al:0.2% Fe:8.0%, Xt:0.06%,
The 4th stove: C:0.07%, Si:0.35%, Mn:0.4%, P:0.07%, S:0.001%, Cr:16.5%, Ni:75%, Cu:0.3%, Ti:0.3%, Al:0.1% Fe:7.0%, Xt:0.05%,
Above-mentioned four stove embodiment its preparation methods are:
1). select pure iron for use, prepare burden according to the present invention's four stove embodiment design mix;
2). vacuum refining furnace is smelted, feed by its loading sequence: carbon C-pure iron Fe-chromium metal JCr-nickel plate Ni-silicon Si-manganese Mn-copper Cu-aluminium AL-titanium Ti, described rare earth Xt stirs coming out of the stove once to add in the molten steel in preceding 5 minutes, refining period, temperature was controlled at 1520 ℃～1580 ℃, refining time 40 minutes;
3). electroslag refining, refining period, temperature was controlled at 1520 ℃～1580 ℃, melting voltage 45-50V, melting electric current 2600-2800A;
4) forge, 1180 ℃-950 ℃ of forging temperatures are opened and are forged 1180 ℃ of temperature;
5) hot rolling, 1190 ℃-900 ℃ of hot-rolled temperatures, 1190 ℃ of start rolling temperatures;
6). normalizing, 950 ℃-1060 ℃ of normalizing temperatures, 1.5 hours air cooling time;
7) multi-pass carries out (drawing-annealing-drawing), it is 950 ℃ of-1050 ℃ of annealing that annealing temperature is adopted in process annealing, annealing insulation 1 hour, drawing employing bicycle (10 meters/minute of speed) at a slow speed carries out, for example: according to customer need, drawing passes is 4 passages, ф 16-14.5*14.5-13*13.5-12*12-11*11.
Above embodiment is designed, the Shockproof strip end-plate material of vapor generator of nuclear power plant of preparation relevant department its composition, comprehensive mechanical property have been carried out detection, test, examining report is as follows:
One. mechanical industry quality of materials inspection center
Material classification: Shockproof strip end-plate.
Sample title: NC15Fe (the present invention); Sample characteristic: piece sample
Detect foundation and/judgment basis: GB/T223.11-2008GB/T8647.4-2006 ISO 4938-1988
Detect data/result
C：0.003％????Cr：15.50％??Mn：0.71％
S：0.001％????P：＜0.002％?Ni：75.94％
Ti：0.059％???Cu：0.076％??Al：0.10％
Two. Stainless Steel Products quality supervision and test center, Jiangsu Province
Material classification: Shockproof strip end-plate;
Sample title: square rod;
Specifications and models: 11*11mm NC15Fe (the present invention);
Sample size: 1 * 300mm;
Sample state: meet survey requirement;
Inspection machine: CMT5305 (0.5 grade) microcomputer control electronics universal testing machine;
Test basis: GB/T228-2002 " metallic substance tensile test at room temperature method ".
Assay:
| Sequence number | Interventions Requested | Measure unit | Assay |
| ??1 | Regulation disproportional extension strength Rp 0.2 | ??MPa | ??350 |
| ??2 | Tensile strength Rm | ??MPa | ??635 |
| ??3 | Elongation after fracture A, % | ??45 |
Three. quality physical and chemical measuring room of east electric (Guangzhou) heavy-duty machine company limited
The material classification: Shockproof strip end-plate,
Sample title: NC15Fe (the present invention);
Embodiment 1-4 stove, 2 in every stove, annealing, specification: ф 10mm,
Test basis: DF-SG/PS-011 Rev:A; NPS-DSD-SG022 Rev:A;
Technical qualification: NPS-DSD-SG022;
Test temperature: room temperature.
1. mechanical property test
2. metallographic examination
3. vapour generator is reported with Shockproof strip end-plate NC15Fe (the present invention) test evaluation
1). test specimen state: before the shockproof bar assembly assembling
2). check type: chemical analysis, mechanical property, UT (Ultrasonic Testing), thermal treatment, visual inspection, dimension inspection.
Assay:
1. visual inspection, dimension inspection, angle and planeness inspection.Result: qualified.
2. heat analysis
1). UT (Ultrasonic Testing) (hot rolling bleaching back).Result: zero defect.
2). thermal treatment.Result: qualified.
3. mechanical property check and analysis (after the thermal treatment pickling).Result: qualified.
4. product analysis.Result: qualified.
Evaluation result: according to shockproof trial-production part evaluation situation analysis, above-mentioned shockproof NC15Fe end plate (the present invention) satisfies vapour generator with every requirement of shockproof, and manufacturing process and product is stablized.
Detect by above embodiment and mechanical property, the designed Shockproof strip end-plate material of vapor generator of nuclear power plant of the present invention has that composition is reasonable in design, cost is low, stable manufacturing process, have superior corrosion resistance, antifatigue, creep resistance and processability, satisfy vapour generator with every service requirements of shockproof, guarantee safe and reliable.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. a Shockproof strip end-plate material of vapor generator of nuclear power plant is characterized in that, count by weight percentage, ingredient is as follows:
C：0.003-0.08％；Si：0.1-0.4％；?Mn：0.3-0.8％；
P：≤0.015％；???S：≤0.01％；???Cr：14-17％；
Ni：72-78％；????Cu：0.05-0.5％；Ti：0.05-0.5％；
Al：0.05-0.5％；?Fe：6-10％；????Xt：0.01-1.0％；
Surplus is a unavoidable impurities.
2. a kind of Shockproof strip end-plate material of vapor generator of nuclear power plant according to claim 1 is characterized in that, the purity of Si, Mn, Cr, Ni, Cu, Ti, Al, Fe is greater than 98%, and granularity is 20-50um.
3. a kind of Shockproof strip end-plate material of vapor generator of nuclear power plant according to claim 1 is characterized in that, described rare earth Xt is the mixture of cerium fluoride, lanthanum fluoride, and its purity is greater than 98%, and granularity is 1-10um.
4. the preparation method of an a kind of Shockproof strip end-plate material of vapor generator of nuclear power plant as claimed in claim 1 is characterized in that comprising the steps:
1) carry out preparation of raw material by the weight percent meter calculation of Shockproof strip end-plate material ingredient:
C：0.003-0.08％；Si：0.1-0.4％；?Mn：0.3-0.8％；
P：≤0.015％；???S：≤0.01％；???Cr：14-17％；
Ni：72-78％；????Cu：0.05-0.5％；Ti：0.05-0.5％；
Al：0.05-0.5％；?Fe：6-10％；????Xt：0.01-1.0％；
Surplus is a 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 1520 ℃～1580 ℃, refining time 40 minutes;
3) electroslag refining, refining period, temperature was controlled at 1520 ℃～1580 ℃, melting voltage 45-50V, melting electric current 2600-2800A;
4) forge, 1180 ℃-950 ℃ of forging temperatures are opened and are forged 1180 ℃ of temperature;
5) hot rolling, 1190 ℃-900 ℃ of hot-rolled temperatures, 1190 ℃ of start rolling temperatures;
6) normalizing, 950 ℃-1060 ℃ of normalizing temperatures, 1.5 hours air cooling time;
7) multi-pass carries out drawing → annealing → drawing, obtains the Shockproof strip end-plate material finished product.
5. the preparation method of a kind of Shockproof strip end-plate material of vapor generator of nuclear power plant according to claim 4 is characterized in that, the drawing described in the step 7) adopts bicycle to carry out.
6. the preparation method of a kind of Shockproof strip end-plate material of vapor generator of nuclear power plant according to claim 4 is characterized in that, the annealing described in the step 7), and its annealing temperature is 950 ℃-1050 ℃, annealing insulation 1 hour.
7. the preparation method of a kind of Shockproof strip end-plate material of vapor generator of nuclear power plant according to claim 4, 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-pure iron Fe-chromium metal Cr-nickel plate Ni-silicon Si-manganese Mn-copper Cu-aluminium AL-titanium Ti, described rare earth Xt stir coming out of the stove once to add in the molten steel in preceding 5 minutes.
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| CN103921083A (en) * | 2012-08-20 | 2014-07-16 | 丹阳市龙鑫合金有限公司 | Preparation method of vibration-proof strip assembly for steam generator |
| CN103934646A (en) * | 2012-08-20 | 2014-07-23 | 丹阳市龙鑫合金有限公司 | Method for manufacturing vibration-proof strip assembly of nuclear power unit steam generator |
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| CN103934648A (en) * | 2012-08-20 | 2014-07-23 | 丹阳市龙鑫合金有限公司 | Manufacturing method for end caps of vibration-proof strip assembly of nuclear power unit vapor generator |
| CN103921079A (en) * | 2012-08-20 | 2014-07-16 | 丹阳市龙鑫合金有限公司 | Method for manufacturing anti-vibration strip assembly |
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| CN103659173A (en) * | 2012-09-23 | 2014-03-26 | 丹阳市龙鑫合金有限公司 | Anti-vibration strip component end cap for nuclear power unit vapor generator |
| CN103659173B (en) * | 2012-09-23 | 2016-05-11 | 丹阳市龙鑫合金有限公司 | The end cap of the antivibration bar assembly of nuclear power generating sets steam generator |
| CN103659172B (en) * | 2012-09-23 | 2016-04-13 | 丹阳市龙鑫合金有限公司 | Prepare the method for the anti-vibration bar of nuclear power generating sets steam generator |
| CN103659172A (en) * | 2012-09-23 | 2014-03-26 | 丹阳市龙鑫合金有限公司 | Method for manufacturing shake-proof strip of steam generator of nuclear power unit |
| CN103801902A (en) * | 2012-11-08 | 2014-05-21 | 丹阳市龙鑫合金有限公司 | Anti-vibration bar assembly of steam generator of CAP1000 nuclear power unit |
| CN103801902B (en) * | 2012-11-08 | 2016-06-15 | 丹阳市龙鑫合金有限公司 | The anti-vibration bar assembly of CAP1000 nuclear power generating sets steam generator |
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