CN102732801B - Pull rod material for nuclear power station steam generator and preparation process thereof - Google Patents
Pull rod material for nuclear power station steam generator and preparation process thereof Download PDFInfo
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- CN102732801B CN102732801B CN201210199380.7A CN201210199380A CN102732801B CN 102732801 B CN102732801 B CN 102732801B CN 201210199380 A CN201210199380 A CN 201210199380A CN 102732801 B CN102732801 B CN 102732801B
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Abstract
The invention discloses a pull rod material for a nuclear power station steam generator. The pull rod material comprises the following components by weight percent: C 0.080 to 0.015%, Si 0.10 to 1.0%, Mn 0.4 to 1.0%, P <= 0.030%, S <= 0.030%, Cr 11.5 to 13.5%, Ni 0.01 to 0.50% and Re 0.02 to 0.80%, with the balance being Fe and unavoidable impurities. A preparation process for the pull rod material comprises the following steps: A, preparation of raw materials according to weight percent of the components of the pull rod material; B, smelting of the raw materials in an induction furnace according to a melting order, wherein the misch metal Re is added into molten steel within 2 to 3 min before steel tapping during smelting in the induction furnace, tapping is carried out immediately after the misch metal Re is added and an argon shield method is adopted for casting during tapping; C, re-melting of electroslag; D, forging; E, hot rolling; F, quenching; and G, tempering. A finished product of the connecting pull rod material is obtained after the above-mentioned steps. According to the invention, the advantages of reasonable design of the components and low cost are achieved and the service life of the nuclear power station steam generator is effectively prolonged.
Description
Technical field
The rod material and preparation method thereof for nuclear power station steam generator that the present invention relates to a kind of new material technology field, is mainly used in pressurized-water reactor nuclear island vapour generator rod 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 the development of national economy, people are more and more higher to the requirement of standard of living and environmental protection, therefore, greatly develop the dominant direction that Nuclear Electricity has become current energy development.It is apparent 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, is the barrier of cutting apart the medium of a loop and secondary circuit, is one of Nuclear power plants key equipment.The Main Function of vapour generator is the heat of water in a loop to be passed to the water of 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.PWR nuclear power plant vapour generator, by the operation of natural circulation principle, in this class vapour generator, guarantees that the prime mover of fluid is the density difference between cold water post and hot water post, and the steam of generation is saturation steam.Each saturation type vapour generator is comprised of the vertical cylindrical shell with built-in carbonated drink separating device and the tube bank of inversion type U-shaped according to the vapour generator of transporting at full capacity PWR nuclear power plant.Each loop in one loop has a vapour generator, and it is tubular type vapourizing unit vertically arranged, natural circulation.Whole device can be divided into: the bottom of feedwater evaporator section vapour generator evaporator section is to consist of inverted 4640 inverted U-shaped tube banks.One Loop Water flows in pipe, and secondary circuit water is vaporization outside pipe.These tube weldings are on the thick manganese-molybdenum-nickel of 585mm (Mn-Mo-Ni) tube sheet, and a circuit pressure is born in tube sheet and tube bank.One Loop Water side seal head consists of cast steel hemispherical head, within it surface coverage stainless steel layer, and be divided into two entrance hydroeciums, outlet hydroecium by being welded in Inco nickel dividing plate on tube sheet.Each hydroecium has adapter and a manhole of linking a loop.The whole vapourizing unit of natural circulation principle is placed in metal cylinder cylindraceous, and cylindrical shell bottom is connected with tube sheet, and its top is connected with a larger metal cylinder that comprises drying installation by a middle transition cone.The entrance of feedwater is positioned at the top of this cylindrical shell.
By a looping pit pipe, completed to water dispenser.Feedwater mixes with the water that drying plant is discharged, and then in the formed annular space of cylindrical steel sheet involucrum of being restrained by bottom cylindrical shell and encirclement, flows downward.Between involucrum bottom and tube sheet upper surface, have a space, here water is heated to and approaches temperature of saturation, then enters in the middle of tube bank, upwards flows.
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, the segmental arc in tube bank is 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, be heated simultaneously, 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 cylinder lever connecting rod material arranging between tube sheet plays keying action to nuclear plant safety reliability service.
Vapour generator union lever is to use under high temperature, high pressure, strong corrosive environment, to manufacturing high temperature strength, erosion resistance, antifatigue, creep resistance and the workability of cylinder lever connecting rod material, has proposed strict demand.At present China is for the manufacture of vapour generator cylinder lever connecting rod material dependence on import still, therefore research and development manufacture has the cylinder lever connecting rod material of good erosion resistance, antifatigue, creep resistance and workability, with replace imported, the economy of effective raising Nuclear power plants and safe reliability tool are of great significance.
Summary of the invention
The invention provides cylinder lever connecting rod material and preparation method thereof for a kind of nuclear power station steam generator, overcome the deficiency in cylinder lever connecting rod material technology for existing vapour generator, this material price is low, Composition Design is reasonable, manufacturing process is simple, has good erosion resistance, anti-tired
Labor, creep resistance and processability.
A kind of nuclear power station steam generator cylinder lever connecting rod material of the present invention, its tensile strength 760-960MPa, yield strength is greater than 590 MPa, and elongation is greater than 15%, and relative reduction in area is greater than 50%, Brinell hardness 228-285HB, 0 ℃ of KV impact value is greater than 40J.
To achieve these goals, the present invention is achieved through the following technical solutions: a kind of nuclear power station steam generator cylinder lever connecting rod material, count by weight percentage, and ingredient is as follows:
C:0.080-0.015%; Si:0.10-1.0%; Mn:0.4-1.0%; P :≤0.030%; S :≤0.030%; Cr:11.5-13.5%; Ni:0.01-0.50%; Re:0.02-0.80%; Surplus is Fe and inevitable impurity;
The purity of wherein said Si, Mn, Cr, Ni, 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 cylinder lever connecting rod material for nuclear power station steam generator, comprises the steps:
A, by nuclear power station steam generator, with the weight percent meter of cylinder lever connecting rod material ingredient, calculate and carry out preparation of raw material:
C:0.080-0.015%; Si:0.10-1.0%; Mn:0.4-1.0%; P :≤0.030%; S :≤0.030%; Cr:11.5-13.5%; Ni:0.01-0.50%; Re:0.02-0.80%; Surplus is Fe and inevitable impurity;
B, the raw material by aforementioned preparation is sequentially added in induction furnace and is smelted by smelting, molten clear after 1500 ℃～1580 ℃ of temperature; Refining temperature during deoxidation slag making wherein: 1550 ℃～1600 ℃, refining time is greater than 40 minutes, makes white slag and keeps 15 minutes; Wherein said norium Re taps add molten steel in induction furnace smelting is tapped first 2～3 minutes in immediately, adopts argon shield method to cast during tapping;
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;
Surface frame divests rod iron surface oxide layer and obtains vapour generator cylinder lever connecting rod finished material.
Preparation method's of the present invention technical characteristics is: adopt induction furnace to add the double melting method of esr, make degassed abundant, again through esr refining, make molten steel clean, norium Re adds quality and the mechanical property of cylinder lever connecting rod for further raising vapour generator before tapping, by controlling forging ratio, be greater than 4, after hot rolling, quench and add the control of the operations such as tempering, finally obtain vapour generator and can reach 780-815MPa by the tensile strength of cylinder lever connecting rod material, yield strength can reach 598 MPa, elongation 18%, shrinking percentage 52-75%, Brinell hardness 228-285HB, 0 ℃ of impact value is greater than the vapour generator cylinder lever connecting rod material of 42-80J.
A kind of nuclear power station steam generator of the present invention is as follows by the principle of cylinder lever connecting rod design of material composition:
C: very effective sclerosis and solution strengthening constituent element, stablize martensitic structure, proof strength, but usually as formation of crack, occur, as too high levels easily forms crisp sclerous tissues and causes delayed cracking, its composition % by weight is limited in 0.080-0.0150%;
Mn: deoxidation and desulfidation, guarantee the important element of oxidation-resistance, less than 0.01% can not obtain abundant deoxidation, surpasses 1 % strength decreased, and its composition % by weight is limited in 0.4-1.0%;
Si: deoxidation, raising yield strength, high temperature corrosion, less than 0.01%, can not obtain abundant oxidation-resistance, surpasses 0.90% toughness drop, and its composition % by weight is limited in 0.1-1.0%;
Ni: improve toughness of material, the raising of intensity is also had to contribution, its composition % by weight is limited in 0.10-0.50%;
Cr: guarantee oxidation-resistance, high temperature corrosion, the indispensable element of raising hot strength, content is too low, can not manifest effect, too high levels, intensity and toughness significantly reduce, and its composition % by weight is limited in 11.5-13.5%;
S, P: be inevitable detrimental impurity element in material, its content is more low better, its composition % by weight, P :≤0.030%, S :≤0.030%;
Re: add norium in material, with Cr, under the compound action of Si, there is good oxidation-resistance, rare earth is strong reducing property element, rare earth and sulphur have very large avidity, in bath, not only there is desoxydatoin, also there is the size that obvious desulfurization improves sulfide inclusion, form and distribution effect, reduce the inclusion content in 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, in the present invention, composition % by weight is limited in 0.02-0.80%.
Adopt the designed nuclear power station steam generator of the present invention with cylinder lever connecting rod material 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 598 MPa, 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 cylinder lever connecting rod material for this nuclear power station steam generator, guarantees the safe reliability of cylinder lever connecting rod operation for vapour generator, 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 nuclear power station steam generator cylinder lever connecting rod material, counts by weight percentage, and ingredient is as follows:
C:0.080-0.015%; Si:0.10-1.0%; Mn:0.4-1.0%; P :≤0.030%; S :≤0.030%; Cr:11.5-13.5%; Ni:0.01-0.50%; Re:0.02-0.80%; Surplus is Fe and inevitable impurity; 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 cylinder lever connecting rod material for nuclear power station steam generator, comprises the steps: A, by nuclear power station steam generator, with the weight percent meter of cylinder lever connecting rod material ingredient, calculates and carry out preparation of raw material: C:0.080-0.015%; Si:0.10-1.0%; Mn:0.4-1.0%; P :≤0.030%; S :≤0.030%; Cr:11.5-13.5%; Ni:0.01-0.50%; Re:0.02-0.80%; Surplus is Fe and inevitable impurity;
B, the raw material by aforementioned preparation is sequentially added in induction furnace and is smelted by smelting, molten clear after temperature; Refining temperature during deoxidation slag making wherein: 1550 ℃～1600 ℃, refining time is greater than 40 minutes, makes white slag and keeps 15 minutes; Wherein said norium Re taps add molten steel in induction furnace smelting is tapped first 2～3 minutes in immediately, adopts argon shield method to cast during tapping;
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;
Surface frame divests rod iron surface oxide layer and obtains vapour generator cylinder lever connecting rod finished material.
Nuclear power station steam generator of the present invention has been prepared 8 stove embodiment with cylinder lever connecting rod material, and wherein said embodiment 1-8 stove rod material ingredient and content are calculated be weight %, as follows:
The first stove: C:0.10%, Si:0.50%, Mn:0.85%, P:0.018%, S:0.004%, Cr:12.15%, Ni:0.11%, Re:0.03%;
The second stove: C:0.11%, Si:0.40%, Mn:0.80%, P:0.012%, S:0.005%, Cr:12.35%, Ni:0.13%, Re:0.04%;
The 3rd stove: C:0.12%, Si:0.60%, Mn:0.82%, P:0.014%, S:0.005%, Cr:12.45%, Ni:0.15%, Re:0.03%;
The 4th stove: C:0.13%, Si:0.55%, Mn:0.83%, P:0.010%, S:0.005%, Cr:12.50%, Ni:0.18%, Re:0.04%;
The 5th stove: C:0.125%, Si:0.65%, Mn:0.81%, P:0.013%, S:0.006%, Cr:12.42%, Ni:0.19%, Re:0.035%;
The 6th stove C:0.12%, Si:0.70%, Mn:0.82%, P:0.014%, S:0.008%, Cr:12.44%, Ni:0.18%, Re:0.04%;
The 7th stove C:0.12%, Si:0.350%, Mn:0.75%, P:0.013%, S:0.006%, Cr:12.56%, Ni:0.17%, Re:0.04%;
The 8th stove: C:0.12%, Si:0.40%, Mn:0.76%, P:0.012%, S:0.005%, Cr:12.51%, Ni:0.175%, Re:0.05%;
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: 1025 ℃, 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 (Guangzhou) heavy-duty machine company limited
Material classification: vapour generator rod material.
Sample title: the present invention
Embodiment 1-8 stove, 1, every stove, annealing, specification: ф 10mm,
Test basis: NPC-44300-JT116 Rev:C;
Technical qualification: NPC-44300-JT116 Rev:C;
Test temperature: room temperature,
1. mechanical property test
2. metallographic examination
Embodiment and mechanical property by above 1-8 stove detect, the designed nuclear power station steam generator of the present invention has with rod material 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.
Claims (1)
1. a preparation method for cylinder lever connecting rod material for nuclear power station steam generator, comprises the steps: A, by nuclear power station steam generator, with the weight percent meter of cylinder lever connecting rod material ingredient, calculates and carry out preparation of raw material: C:0.080-0.12%; Si:0.10-1.0%; Mn:0.4-1.0%; P :≤0.030%; S :≤0.030%; Cr:11.5-13.5%; Ni:0.01-0.50%; Re:0.02-0.80%; Surplus is Fe and inevitable impurity;
B, the raw material by aforementioned preparation is sequentially added in induction furnace and is smelted by smelting, molten clear after 1500 ℃～1580 ℃ of temperature; Refining temperature during deoxidation slag making wherein: 1550 ℃～1600 ℃, refining time is greater than 40 minutes, makes white slag and keeps 15 minutes; Wherein said norium Re taps add molten steel in induction furnace smelting is tapped first 2～3 minutes in immediately, adopts argon shield method to cast during tapping;
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; Surface frame divests rod iron surface oxide layer and obtains vapour generator cylinder lever connecting rod finished material.
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| CN201210199380.7A CN102732801B (en) | 2012-06-18 | 2012-06-18 | Pull rod material for nuclear power station steam generator and preparation process thereof |
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| CN102732801A CN102732801A (en) | 2012-10-17 |
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| CN103725982A (en) * | 2013-10-26 | 2014-04-16 | 溧阳市浙大产学研服务中心有限公司 | Anti-corrosion high-strength magnetic control connecting piece |
| CN103602917A (en) * | 2013-10-26 | 2014-02-26 | 溧阳市浙大产学研服务中心有限公司 | Manufacturing method of magnetic control connection member for pressurized water reactor nuclear island |
| CN103725979A (en) * | 2013-10-26 | 2014-04-16 | 溧阳市浙大产学研服务中心有限公司 | Manufacturing method of magnetic control connecting piece for pressurized water reactor nuclear island |
| CN103602916A (en) * | 2013-10-26 | 2014-02-26 | 溧阳市浙大产学研服务中心有限公司 | Manufacturing method of magnetic control connection member for pressurized water reactor nuclear island |
| CN103725981A (en) * | 2013-10-26 | 2014-04-16 | 溧阳市浙大产学研服务中心有限公司 | Preparation method of high-performance magnetic control connecting piece |
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| CN103725991A (en) * | 2013-10-26 | 2014-04-16 | 溧阳市浙大产学研服务中心有限公司 | Manufacturing method of magnetic control connecting piece for pressurized water reactor nuclear island |
| CN103643153A (en) * | 2013-10-26 | 2014-03-19 | 溧阳市浙大产学研服务中心有限公司 | Magnetic control connecting piece for pressurized water reactor nuclear island |
| CN115045932B (en) * | 2022-06-30 | 2023-10-13 | 湖南湘投轻材科技股份有限公司 | Method for manufacturing ventilated brake disc |
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| CN101831592A (en) * | 2010-05-27 | 2010-09-15 | 江苏新华合金电器有限公司 | Shockproof strip material of nuclear power station steam generator, and preparation method thereof |
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| CN101831592A (en) * | 2010-05-27 | 2010-09-15 | 江苏新华合金电器有限公司 | Shockproof strip material of nuclear power station steam generator, and preparation method thereof |
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