CN103725979A - Manufacturing method of magnetic control connecting piece for pressurized water reactor nuclear island - Google Patents
Manufacturing method of magnetic control connecting piece for pressurized water reactor nuclear island Download PDFInfo
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- CN103725979A CN103725979A CN201310515640.1A CN201310515640A CN103725979A CN 103725979 A CN103725979 A CN 103725979A CN 201310515640 A CN201310515640 A CN 201310515640A CN 103725979 A CN103725979 A CN 103725979A
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Abstract
The invention discloses a manufacturing method of a magnetic control connecting piece with high performance. The manufacturing method comprises the following steps: A, calculating and preparing raw materials contained by the magnetic control connecting piece for a pressurized water reactor nuclear island in percentage by weight as follows: 0.12% of C, 0.61% of Ti, 1.1% of Mn, 0.35% of Si, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S, 0.26% of Cr, 0.33% of Mo, 1.16% of Ni, 0.02% of Nb, smaller than or equal to 0.02% of Al, smaller than or equal to 0.008% of N, smaller than or equal to 0.0002% of H, smaller than or equal to 0.003% of O, smaller than or equal to 0.02% of As plus Sn plus Pb plus Sb plus Bi, the balance of Fe and inevitable impurities, and the total mass percentage is 100%; B, adding the prepared raw materials into an induction furnace for smelting according to a smelting sequence; C, electroslag remelting; D, forging; E, hot rolling; F, quenching; G, tempering; and H, stripping an oxide layer on the surface of a steel bar. The magnetic control connecting piece prepared with the method has superior corrosion resistance, fatigue resistance, creep resistance and a machinable property.
Description
Technical field
The present invention relates to a kind of manufacture method of the emergency protective device for nuclear reactor.
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, and its Main Function is the water of the heat of water in a loop being passed to secondary circuit, makes its vaporization.Due to flow through reactor core and with radioactivity of a Loop Water, thus vapour generator and pressurized vessel and primary coolant circuit pipe common form prevent the second barrier that radioactivity is excessive.When PWR nuclear power plant normally moves, secondary circuit should not be subject to the pollution of a Loop Water, be do not have radioactive.By a looping pit pipe, completed to water dispenser.Dividing plate by means of Steam Generator U tube bank keeps the spacing of tube bank, and by pull bar, fixes between dividing plate.On 8 antidetonation dividing plates, have that some Kong Yirang pipe and water--vapour mixture passes through.In addition, dividing plate prevents that by some the chock of restraining body vibration is fixed on bundle wrapper.Equally, at the segmental arc of tube bank, be also provided with vibrationproof backstay.
A Nuclear power plants need arrange several vapour generators, include ten hundreds of heat-transfer pipes, high-temperature setting-out flows in tube bank, for feedwater, along pipe, with vertical direction, flow, simultaneously heated, be then vaporized, steam enters steam turbine generating, the fluid contacting with these pipes can cause vibrations, need to separate and prevent that damaged tubular from breaking with antidetonation dividing plate, directly causes vapour generator and damages.For effectively preventing from isolating the vibrations of tube sheet, the magnetic control union lever arranging between tube sheet plays keying action to nuclear plant safety reliability service.
The magnetic control union lever of vapour generator is at high temperature, high pressure, under strong corrosive environment, use, to manufacturing the high temperature strength of union lever, erosion resistance, antifatigue, creep resistance and workability have proposed strict demand, the magnetic control connecting piece that our factory is produced is for domestic many Nuclear power plants, obtain user's general favorable comment, but performance still can not meet need of production completely, therefore research and development manufacture has better erosion resistance, antifatigue, the magnetic control union lever of creep resistance and workability, economy to effective raising Nuclear power plants and safe reliability tool are of great significance.
Summary of the invention
The invention provides a kind of emergent rod drop during for pressurized-water reactor nuclear island mid-winter, realize the magnetic control connecting piece of non-active shutdown, it can overcome the deficiencies in the prior art, has good erosion resistance, antifatigue, creep resistance and processability.
Magnetic control connecting piece of the present invention, its tensile strength 890-1080MPa, yield strength is greater than 690MPa, and elongation is greater than 25%, and relative reduction in area is greater than 60%, Brinell hardness 268-335HB, 0 ℃ of KV impact value is greater than 50J.
To achieve these goals, the present invention is achieved through the following technical solutions: a kind of preparation method of high-performance magnetic control web member, comprises the steps:
A, by pressurized-water reactor nuclear island, with the weight percent meter of magnetic control connecting piece ingredient, calculate and carry out preparation of raw material:
C:0.12; Ti:0.61; Mn:1.10; Si:0.35; P≤0.015; S≤0.005; Cr:0.26; Mo:0.33; Ni:1.16; Nb:0.020; Al≤0.02; N≤0.008; H≤0.0002; O≤0.003; As+Sn+Pb+Sb+Bi≤0.020; All the other are Fe and inevitable impurity, and mass percent amounts to 100%;
B, will by smelting order, add in induction furnace and smelt by the raw material of aforementioned preparation, molten clear after 1500 ℃～1580 ℃ of temperature; Wherein refining temperature during deoxidation slag making: 1550 ℃～1600 ℃, refining time is greater than 40 minutes, makes white slag and keeps 15 minutes;
C, esr, esr temperature: 1520 ℃～1580 ℃, melting voltage: 55/60V; Melting electric current: 5000/6000A;
D, forging, open forging temperature: 1150 ℃, final forging temperature >=950 ℃;
E, hot rolling, 1150 ℃ of hot-rolled temperatures, finishing temperature >=950 ℃;
F, quenching, 980 ℃～1050 ℃ of normalizing temperatures, hardening is cooling;
G, tempering, 600 ℃～650 ℃ of tempering temperatures, water cooling or air cooling are but;
H, divest rod iron surface oxide layer and obtain vapour generator union lever finished product.
Ti is a kind ofly carrying the high-intensity while and is not causing the alloying element of embrittlement, and Ti utilizes solution strengthening and two kinds of strengthening mechanisms of Precipitation in steel, has improved solidity to corrosion and the intensity of steel, has also improved weldability, formability and machinability etc. simultaneously.But Copper Bearing Steel, because copper is easily at steel surface enrichment, makes its surface in hot rolling or casting process easily form crackle.Add Ni and can improve the solubleness of Ti in austenite in steel, reduce Ti and separate out at crystal boundary, also can improve the temperature of fusion at oxide skin/steel interface Ti precipitate.Can make like this Ti enriched layer on steel surface become the Ti-Ni enriched layer that fusing point exceedes 1200 ℃, reach the object of avoiding containing Ti steel surface crack.In this steel grade system, Ni/Ti >=1.6 o'clock, can effectively avoid the generation that Ti is hot-short.Therefore Ti, Ni content be chosen in respectively 0.55～0.65%, 1.10～1.25% more suitable.Cr can suppress the generation of FAC phenomenon, but Cr increases Ti red brittleness tendency, therefore its content be controlled at 0.20～0.30% more suitable.Nuclear power will reach the metallurgical quality requirement of high cleanliness, low gas, low inclusion content with steel, therefore S, P, H, O, N content are lower.When in steel, five-harmful elements As, Sn, Pb, Sb, Bi content exceed certain limit, capital obviously reduces high-temperature mechanical property, increase the high-temperature brittleness of steel, reduce intensity and the toughness of steel, steel is become fragile, and As, Sn can obviously increase Ti red brittleness tendency, therefore need As, Sn and five-harmful elements content to limit.
Adopt the designed pressurized-water reactor nuclear island of the present invention magnetic control connecting piece compared with prior art, tool has the following advantages:
1. Composition Design is reasonable, cost is low, safe and reliable;
2. its tensile strength of cylinder lever connecting rod strip material 780-815MPa for this vapour generator, yield strength can reach 598MPa, elongation 18%, hardness 230-260, shrinking percentage 52-75%, Brinell hardness 228-285HB, 0 ℃ of impact value is greater than 42-80J.Under 1000 ℃ of high temperature, long term operation has higher-strength and corrosion resistance, its high temperature stress intensity stabilization;
3. because added micro-rare earth element and the special preparation technology who has adopted double melting, guarantee that material has good erosion resistance, antifatigue, creep resistance and processability;
4. the alternative import of magnetic control connecting piece for this pressurized-water reactor nuclear island, guarantees the safe reliability that vapour generator cylinder lever connecting rod moves, and effectively extends the work-ing life of nuclear power station steam generator, reduces costs, and significantly improves economic benefit.For advancing nuclear power domestic manufacture of key equipment to have very significance.
Embodiment
In order to deepen the understanding of the present invention, below in conjunction with embodiment, the invention will be further described, and following examples only, for explaining the present invention, do not form limiting the scope of the present invention.
A kind of pressurized-water reactor nuclear island magnetic control connecting piece, counts by weight percentage, and ingredient is as follows:
C:0.10～0.15; Ti:0.55～0.65; Mn:0.90～1.20; Si:0.20～0.45; P≤0.015; S≤0.005; Cr:0.20～0.30; Mo:0.25～0.40; Ni:1.10～1.25; Nb:0.015～0.025; Al≤0.02; N≤0.008; H≤0.0002; O≤0.003; As+Sn+Pb+Sb+Bi≤0.020, all the other are Fe and inevitable impurity, mass percent amounts to 100%;
The purity of wherein said Si, Mn, Cr, Ni, Ti, Fe is all greater than 99%, and granularity is 20-50um; Described rare earth Re is norium, and its purity is greater than 99%, block 60*100mm.
A preparation method for high-performance magnetic control web member, comprises the steps:
A, by pressurized-water reactor nuclear island, with the weight percent meter of magnetic control connecting piece ingredient, calculate and carry out preparation of raw material: C:0.10～0.15; Ti:0.55～0.65; Mn:0.90～1.20; Si:0.20～0.45; P≤0.015; S≤0.005; Cr:0.20～0.30; Mo:0.25～0.40; Ni:1.10～1.25; Nb:0.015～0.025; Al≤0.02; N≤0.008; H≤0.0002; O≤0.003; As+Sn+Pb+Sb+Bi≤0.020, all the other are Fe and inevitable impurity, mass percent amounts to 100%;
B, will by smelting order, add in induction furnace and smelt by the raw material of aforementioned preparation, molten clear after temperature; Wherein refining temperature during deoxidation slag making: 1550 ℃～1600 ℃, refining time is greater than 40 minutes, makes white slag and keeps 15 minutes;
C, esr, esr temperature: 1520 ℃～1580 ℃, melting voltage: 55/60V; Melting electric current: 5000/6000A;
D, forging, open forging temperature: 1150 ℃, final forging temperature >=950 ℃;
E, hot rolling, 1150 ℃ of hot-rolled temperatures, finishing temperature >=950 ℃;
F, quenching, 980 ℃～1050 ℃ of normalizing temperatures, hardening is cooling;
G, tempering, 600 ℃～650 ℃ of tempering temperatures, water cooling or air cooling are but;
H, divest rod iron surface oxide layer and obtain vapour generator union lever finished product.
Pressurized-water reactor nuclear island of the present invention has been prepared 16 stove embodiment with magnetic control connecting piece, lists the wherein rod material ingredient of 8 embodiment below, and wherein content is calculated be weight %:
The first stove:
C：0.12；Ti：0.61；Mn：1.10；Si：0.35；P≤0.015；S≤0.005；Cr：0.26；Mo：0.33；Ni：1.16；Nb：0.020；Al≤0.02；N≤0.008；H≤0.0002；O≤0.003；As+Sn+Pb+Sb+Bi≤0.020；
The second stove:
C：0.12；Ti：0.62；Mn：1.10；Si：0.35；P≤0.015；S≤0.005；Cr：0.27；Mo：0.32；Ni：1.16；Nb：0.020；Al≤0.02；N≤0.008；H≤0.0002；O≤0.003；As+Sn+Pb+Sb+Bi≤0.020；
The 3rd stove:
C：0.125；Ti：0.61；Mn：1.15；Si：0.325；P≤0.015；S≤0.005；Cr：0.26；Mo：0.33；Ni：1.17；Nb：0.019；Al≤0.02；N≤0.008；H≤0.0002；O≤0.003；As+Sn+Pb+Sb+Bi≤0.020；
The 4th stove:
C：0.125；Ti：0.62；Mn：1.15；Si：0.325；P≤0.015；S≤0.005；Cr：0.26；Mo：0.34；Ni：1.16；Nb：0.021；Al≤0.02；N≤0.008；H≤0.0002；O≤0.003；As+Sn+Pb+Sb+Bi≤0.020；
The 5th stove:
C：0.13；Ti：0.59；Mn：1.15；Si：0.31；P≤0.015；S≤0.005；Cr：0.25；Mo：0.34；Ni：1.17；Nb：0.021；Al≤0.02；N≤0.008；H≤0.0002；O≤0.003；As+Sn+Pb+Sb+Bi≤0.020；
The 6th stove:
C：0.13；Ti：0.60；Mn：1.05；Si：0.32；P≤0.015；S≤0.005；Cr：0.25；Mo：0.34；Ni：1.17；Nb：0.021；Al≤0.02；N≤0.008；H≤0.0002；O≤0.003；As+Sn+Pb+Sb+Bi≤0.020；
The 7th stove:
C：0.12；Ti：0.59；Mn：1.05；Si：0.30；P≤0.015；S≤0.005；Cr：0.25；Mo：0.325；Ni：1.17；Nb：0.02；Al≤0.02；N≤0.008；H≤0.0002；O≤0.003；As+Sn+Pb+Sb+Bi≤0.020；
The 8th stove:
C：0.12；Ti：0.60；Mn：1.05；Si：0.33；P≤0.015；S≤0.005；Cr：0.25；Mo：0.325；Ni：1.16；Nb：0.02；Al≤0.02；N≤0.008；H≤0.0002；O≤0.003；As+Sn+Pb+Sb+Bi≤0.020。
Above-mentioned eight stove embodiment its preparation methods are: select ultralow-carbon pure iron, according to the present invention's eight stove embodiment design mix batchings, adopt duplex smelting process technique, refining temperature when wherein induction furnace is smelted deoxidation slag making: 1575 ℃, refining time is 60 minutes, white slag keeps 15 minutes → esr, refining temperature: 1575 ℃, melting voltage: 55/60V; Melting electric current: 5000/6000A → forging, open forging temperature: 1150 ℃, final forging temperature: 1000 ℃ → hot rolling, hot-rolled temperature: 1150 ℃, finishing temperature: 1000 ℃ → quench, normalizing temperature: 1005 ℃, hardening is cooling → tempering, 625 ℃ of tempering temperatures, water cooling or air cooling.
The nuclear power station steam generator of the designed preparation of embodiment of above 1-8 stove is supplied with and is used and get the nod in batches with pull bar strip material, through relevant department, its composition, comprehensive mechanical property has been carried out to detection, test, and examining report is as follows:
One. quality physical and chemical measuring room of DEC's (Nanjing) heavy-duty machine company limited
Material classification: pressurized-water reactor nuclear island magnetic control connecting piece material.
Sample title: the present invention
Embodiment 1-8 stove, 1, every stove, annealing, specification: ф 10mm,
Test basis: NPC-44300-JT116Rev:C;
Technical qualification: NPC-44300-JT116Rev:C;
Test temperature: room temperature,
1. mechanical property test
2. metallographic examination
By the embodiment of above 1-8 stove, especially embodiment 1～4, more specifically the mechanical property of embodiment 1 detects, the designed pressurized-water reactor nuclear island vapour generator union lever of the present invention has that Composition Design is reasonable, cost is low, stable manufacturing process, there is good erosion resistance, antifatigue, creep resistance and processability, guarantee safe and reliable.To enhancing productivity, effectively extend the work-ing life of nuclear power station steam generator, reduce production costs and there is very important economic implications.
From the above description of this invention, can obviously learn, the present invention can change with many forms.And these variations can not be considered to exceed technological thought of the present invention and scope.And, to those skilled in the art, within these apparent variant are all included in the scope of protection of the invention.
Claims (5)
1. a preparation method for high-performance magnetic control web member, is characterized in that: comprise the steps:
A, by pressurized-water reactor nuclear island, with the weight percent meter of magnetic control connecting piece ingredient, calculate and carry out preparation of raw material:
C:0.12; Ti:0.61; Mn:1.10; Si:0.35; P≤0.015; S≤0.005; Cr:0.26; Mo:0.33; Ni:1.16; Nb:0.020; Al≤0.02; N≤0.008; H≤0.0002; O≤0.003; As+Sn+Pb+Sb+Bi≤0.020; All the other are Fe and inevitable impurity;
B, by suitable by smelting by the raw material of aforementioned preparation, order of addition(of ingredients) is that C-Fe-Ni-Cr-Si-Mn-Re adds in induction furnace and smelts, molten clear after temperature be controlled at 1520 ℃～1580 ℃; Refining temperature: 1550 ℃～1600 ℃, refining time is greater than 40 minutes, makes white slag and keeps 15 minutes;
C, esr, esr temperature: 1520 ℃～1580 ℃, melting voltage: 55/60V; Melting electric current: 5000/6000A;
D, forging, open forging temperature: 1150 ℃, final forging temperature >=950 ℃;
E, hot rolling, 1150 ℃ of hot-rolled temperatures, finishing temperature >=950 ℃;
F, quenching, 980 ℃～1050 ℃ of normalizing temperatures, hardening is cooling;
G, tempering, 600 ℃～650 ℃ of tempering temperatures, water cooling or air cooling are but;
H, the rod iron surface oxide layer that divests final formation obtain vapour generator union lever finished product.
2. pressurized-water reactor nuclear island magnetic control connecting piece according to claim 1, is characterized in that: the purity of wherein said Mn, Si, Cr, Ni, Fe is all greater than 99%, and granularity is 20-50um.
3. pressurized-water reactor nuclear island magnetic control connecting piece according to claim 1 and 2, is characterized in that: its tensile strength 890-1080MPa, yield strength is greater than 690MPa.
4. pressurized-water reactor nuclear island magnetic control connecting piece according to claim 1 and 2, is characterized in that: its elongation is greater than 25%, and relative reduction in area is greater than 60%.
5. pressurized-water reactor nuclear island magnetic control connecting piece according to claim 1 and 2, is characterized in that: its Brinell hardness 268-335HB, 0 ℃ of KV impact value is greater than 50J.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103981437A (en) * | 2014-05-09 | 2014-08-13 | 南安市国高建材科技有限公司 | Alloy steel with high strength and high toughness, preparation method and application thereof to steel structure |
| CN112195414A (en) * | 2020-10-21 | 2021-01-08 | 中泽电气科技有限公司 | Preparation method of corrosion-resistant stainless steel material for distribution box |
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Application publication date: 20140416 |