CN102764966B - Method for producing vibration-resistant bar assembly of AP1000 nuclear power generating set steam generator - Google Patents

Abstract

Disclosed is a method for producing a vibration-resistant bar assembly of an AP1000 nuclear power generating set steam generator. The method comprises processes of production of vibration-resistant bars, production of end caps, bending molding, assembly of end caps, heading, detection, cleaning and packaging. The vibration-resistant bar assembly of the AP1000 nuclear power generating set steam generator has a simple structure, the quality of the vibration-resistant bar assembly meets accurate requirements of steam generators in a nuclear power plant for vibration-resistant bars and the vibration-resistant bar assembly is safe during usage. According to the method for producing the vibration-resistant bars, the production processes are strict, the technical requirements for the vibration-resistant bar assembly of the steam generator in the nuclear power plant are guaranteed, the quality is guaranteed and the safety is improved.

Description

The preparation method of the antivibration bar assembly of AP1000 nuclear power generating sets steam generator

Technical field

The present invention relates to a kind of preparation method of antivibration bar assembly of AP1000 nuclear power generating sets steam generator.

Background technology

U-shaped heat transfer tube in nuclear power station is that in a circuit system pressure boundary, most critical is also the weakest link.Once tube vibration destroys, and must change steam generator, this certainly will cause the huge waste of manpower, financial resources and event, has also increased the danger that maintainer is subject to radioactivity irradiation.Therefore, therefore broken the running affairs of solution steam generator is to be related to the security of nuclear power station and to make nuclear power station have the key issue of competitiveness and vitality.

To eliminate the root of generation of vibration as far as possible, generally need in steam generator, install antivibration bar additional in U-shaped heat-transfer pipe elbow, how the antivibration bar assembly that a kind of resistance to shock is good is provided, and the preparation method convenient and simple, precision is high, be the technical barrier of this area.

Summary of the invention

The technical problem to be solved in the present invention is to provide the preparation method of the antivibration bar assembly of the AP1000 nuclear power generating sets steam generator that a kind of resistance to shock is good.

For solving the problems of the technologies described above, the invention provides a kind of preparation method of antivibration bar assembly of AP1000 nuclear power generating sets steam generator.Described antivibration bar assembly comprises: the antivibration bar of V-shape structure and be located at respectively the end cap at antivibration bar two ends; Described antivibration bar is selected 405 stainless steel materials; Described end cap is selected 690 nickel-bass alloy materials, and the U-shaped heat transfer tube in unit steam generator is also nickel-bass alloy material, and the two material is identical, can conveniently U-shaped heat transfer tube and described end cap be welded and fixed.690 nickel-bass alloy materials have the feature that corrosion resistance is strong simultaneously.Described preparation method, comprising: antivibration bar bar bends molding procedure: by antivibration bar bar on request size overall length add 50mm allowance and cut off, set angle bends antivibration bar, the antivibration bar after bending is placed on surface grinding machine, and bent angle buildup area is carried out to reconditioning.

The preparation method of described antivibration bar assembly also comprises: the operation of end cap assembling: end cap is dabbed to the endoporus of washing end cap surface and line excision forming with alcohol, with alcohol, stainless steel bars is cleaned simultaneously, after cleaning up, deburring, bite mark, protrusion metal or wedge angle; Again cap end is inserted in the end of stainless steel bar, alignment angle is assembled.

The preparation method of described antivibration bar assembly also comprises: upsetting pressure operation, comprising: (1) pulling-out force procedure qualification: the end cap having assembled and carry out after upsetting pressure is carried out to pulling-out force evaluation, make cap bag under lowest pull, position is not moved; End pulling-out force under different pressures makes a record, and chooses most suitable pressure, as the pressure process parameter in upsetting pressure operation; (2) upsetting pressure: cap end is put into upsetting pressure mould, respectively upsetting pressure is carried out in the position at the contiguous end cap two ends on the middle position of end cap and antivibration bar with hydraulic press, depress maintenance pressure off-load after 10 seconds behind location.Upsetting pressure position on antivibration bar has everywhere, and each two place, contiguous end cap end is spacing for cap end is carried out, and prevents that end cap is subjected to displacement on antivibration bar.

A preparation method for above-mentioned antivibration bar bar, comprises following operation successively: induction furnace smelting, forging, hot rolling, the first heat treatment, cold-drawn, the second heat treatment, finished product processing.

Described induction furnace is smelted: when alloy material is smelted, in induction furnace bottom, place nickel plate, pure iron, crome metal, and load in mixture closely knit, after fusing 70%, add 2% slag charge of the weight that always feeds intake to make steel, record molten steel temperature and reach after tapping temperature molten steel to fall down in ladle, after calm 1-2 minute, pour into steel ingot, effectively improved degree of purity, the structural homogenity of steel alloy, improve surface, the inherent quality of steel ingot, improved the performance of steel alloy.

Antivibration bar alloy material requires pure; Chemical composition accurately, evenly; And there is a structural state of appointment.Adopt induction furnace to there are a series of unarguable advantages.Because it does not have existing pollution sources in other equipment, can guarantee to obtain the purest metal material concerning carbon and other impurity; Thereby stir owing to thering is electric power the uniformity that metal bath guarantees alloy; Guarantee obtain exactly and keep the needed temperature of metal and temperature is uniformly distributed along whole bath temperature; Eliminate hot-spot; Because its thawing speed is fast, iron loss is few, thereby for obtaining accurately regulation alloying component, minimum melting loss of elements creates favorable conditions; When changing the refining chemical composition metal different from forehearth, it has very high mobility.

Described forging: the steel ingot of the antivibration bar alloy material after smelting by induction furnace is forged into after 1150-1220 ℃ of heating and insulation to the steel billet of 50*50mm size; By delivering to lower step hot rolling blank operation after surface finish reconditioning .

Forging is that a kind of metal forming machinery that utilizes is exerted pressure to metal stock, make it produce plastic deformation to obtain the processing method with certain mechanical performance, definite shape and size forging, by forging, can eliminate the defects such as cast condition that metal produces in smelting process is loose, optimize heterogeneous microstructure, owing to having preserved complete metal streamline, the mechanical performance of forging is generally better than the foundry goods of same material simultaneously.The strength member that in associated mechanical, load is high, condition of work is severe, except sheet material, section bar or the weldment of the better simply available rolling of shape, adopts forging more.In general forging is that the first step that belongs to materials processing is called " cogging ".

Described hot rolling: by antivibration bar alloy material 50 * 50mm blank, carry out hot rolling after being placed at 1050-1100 ℃ of temperature heating, insulation, be rolled into the bar of ф 16mm.

Antivibration bar alloy material becomes the steel of the mode various geometric cross section shapes that blank is rolled into of heating for 50 * 50mm blank by hammer cogging.Different according to sectional shape shape, be divided into simple section, compound section or three kinds of shaped steel such as special-shaped section and die rolled section.

(1) hot rolling can significantly reduce energy consumption, reduces costs.Metal during hot rolling plasticityheight, resistance of deformation is low, has greatly reduced the energy consumption of flow of metal.

(2) hot rolling can improve metal and alloyprocess industrial art performance, the coarse grain that is about to as-cast condition is broken, significantly crack healing, reduces or eliminates casting flaw, as-cast structure is changed into the Deformation structure of refinement, puies forward heavy alloyed processing characteristics.

(3) antivibration bar alloy material is by the large ingot casting of hot rolling adopting, and heavy reduction rolling, has not only improved production efficiency, and for improving mill speed, realization the operation of rollingserialization and automation created condition.

(4) in fact hot-rolled process belongs to the essential step that middle manufacturing procedure is formation finished product blank.

Described the first heat treatment: for the surface quality that the guarantees antivibration bar alloy material bar after to hot rolling carries out carrying out vacuum annealing processing after surface finish, reconditioning again, φ 16 antivibration bar alloy material bars heat, are incubated at 800 ℃ ± 10 ℃ of temperature.

Intermediate heat-treatment is named again heat treatment in advance, is for eliminating the defect of a upper procedure or making operation below process well the heat treatment arranging.Be that metal is slowly heated to uniform temperature, keep enough time, then with the cooling a kind of metal heating processing technology of Reasonable Speed.

Annealing heat treatment is divided into full annealing, partial annealing and stress relief annealing.The mechanical property of annealed material can detect with tension test, also can detect by hardness test.

The object of stress annealing:

1. improve or eliminate various tissue defects and the residual stress that iron and steel causes in casting, forging and stamping, rolling and welding process, preventing workpiece deformation, cracking.

2. softening workpiece is to carry out machining.

3. crystal grain thinning, improves tissue to improve the mechanical performance of workpiece.

4. for performing tissue, final heat treatment (quenching, tempering) prepares.

Described cold-drawn: first carry out soft annealing processing, be incubated 40 minutes at 720-750 ℃ of temperature; By glomerocryst mould drawing successively for deformation requirements, and effects on surface micro-crack place carries out reconditioning, and reconditioning can be carried out the drawing of lower road to zero defect.

Cold-drawn is that the antivibration bar alloy bar after hot rolling is reprocessed at cold state after soft annealing, to obtain the production method of all kinds of precisions, high-precision product or intermediate products.

Described the second heat treatment: the material that antivibration bar alloy bar is pulled to finished product is laid in bell-jar heat-treatment furnace; under hydrogen shield state, heat-treat; between annealing soak, temperature is 788-815 ℃; insulation is more than 3 hours; then; to be no more than the cooling velocity of 28 ℃/h, slowly cool to below 610 ℃, then air cooling is to room temperature.

Metal heat treatmet is one of important process in machine-building, compare with other processing technologys, heat treatment does not generally change the shape of workpiece and whole chemical composition, but by changing the microscopic structure of inside workpiece, or change the chemical composition of surface of the work, give or improve the serviceability of workpiece.Be characterized in improving the inherent quality of workpiece, and this not to be generally naked eyes can see.

For making metal works have needed mechanical property, physical property and chemical property, except reasonable selection material and various forming technology, Technology for Heating Processing is requisite often.Iron and steel is material most widely used in mechanical industry, and microstructure of iron and steel is complicated, can be controlled by heat treatment, so the heat treatment of iron and steel is the main contents of metal heat treatmet.In addition, aluminium, copper, magnesium, titanium etc. and alloy thereof also can change its mechanics, physics and chemistry performance by heat treatment, to obtain different serviceabilities.

Described finished product processing: the bar after processing is aligned, polished.

Aligning: the rectification that the shape defect of Metal Forming product is carried out; it is one of important finishing procedure; cold-drawn material often can produce various shapes defect in production process or cooling and transportation afterwards; such as the bending of section bar tubing, wave, wooden dipper song etc.; by various equipment for straightening, can make the defects such as bending be eliminated under external force, make product reach qualified perfect condition.

Polishing: (1) corase grind: the polishing of product except to make smooth surface smooth, the more important thing is and should reduce as far as possible top layer damage.Every one branner's order must be removed the deformation layer (deformation layer that at least should make last procedure produce reduces to the deformation layer degree of depth that this procedure produces) that last procedure causes, rather than only the polishing scratch of last procedure removed; Meanwhile, this procedure itself should accomplish to reduce as far as possible damage, so that carry out next process.The deformation layer degree of depth that last one branner's order produces should be very shallow, guarantees to remove in lower one polishing process.This process will notice preventing that metal from too generating heat.

(2) fine grinding: the object of fine grinding is the darker polishing scratch staying while eliminating corase grind, for next step polishing is laid a solid foundation.Fine grinding normally carries out on sand paper, and sand paper divides waterproof abrasive paper and abrasive paper for metallograph.Conventionally waterproof abrasive paper is that SiC abrasive material is water insoluble, the abrasive material of abrasive paper for metallograph has Alundum, carborundum, iron oxide etc., property is all extremely hard, be polygon corner angle, have good cutting ability, during fine grinding, available water is carried out manual wet-milling or mechanical wet-milling as lubricant, conventionally uses that granularity is 240,320,400,600 4 kind of waterproof abrasive paper can carry out polishing after polishing, for compared with soft metal, apply polishing again after thinner abrasive paper for metallograph polishing.Sand paper is downward-sloping (from operator's direction) outwardly, stick on while grinding on plate glass, after sample flour milling is flat, on sand paper, straight line pushes away forward and while returning, leaves sand paper, thisly repeatedly carries out, until old polishing scratch all disappears, only on whole flour milling, obtain the consistent uniformly new polishing scratch of direction limit, before often changing one sand paper, must wash away sample and sand grains on hand for first water, and dry, then sample half-twist is ground on secondary sand paper.Water mobile during use ceaselessly flows through from coated abrasive surface, in time most abrasive dusts and the abrasive particle coming off is washed away.Like this in whole polishing operation process, the sharp corners of abrasive particle all the time with the Surface Contact of sample, keep its good ablation.Another advantage of wet grinding is that the frictional heat producing at specimen surface when the cooling effect of water can reduce polishing, avoids microscopic structure to change.Whole polishing operation can complete on same equipment.

The preparation method of above-mentioned end cap, comprises following operation successively: induction furnace smelting, forging, hot rolling, heat treatment, end cap Vehicle Processing.

Described induction furnace is smelted: when alloy material is smelted, in induction furnace bottom, place nickel plate, pure iron, crome metal, and load in mixture closely knit, after fusing 70%, add 2% slag charge of the weight that always feeds intake to make steel, record molten steel temperature and reach after tapping temperature molten steel to fall down in ladle, after calm 1-2 minute, pour into steel ingot.

Antivibration bar alloy material requires pure; Chemical composition accurately, evenly; And there is a structural state of appointment.Adopt induction furnace to there are a series of unarguable advantages.Because it does not have existing pollution sources in other equipment, can guarantee to obtain the purest metal material concerning carbon and other impurity; Thereby stir owing to thering is electric power the uniformity that metal bath guarantees alloy; Guarantee obtain exactly and keep the needed temperature of metal and temperature is uniformly distributed along whole bath temperature; Eliminate hot-spot; Because its thawing speed is fast, iron loss is few, thereby for obtaining accurately regulation alloying component, minimum melting loss of elements creates favorable conditions; When changing the refining chemical composition metal different from forehearth, it has very high mobility.

Described forging: the steel ingot of the antivibration bar alloy material after smelting by induction furnace is forged into after 1150-1220 ℃ of heating and insulation to the steel billet of 50*50mm size; By delivering to lower step hot rolling blank operation after surface finish reconditioning.

Forging is that a kind of metal forming machinery that utilizes is exerted pressure to metal stock, make it produce plastic deformation to obtain the processing method with certain mechanical performance, definite shape and size forging, by forging, can eliminate the defects such as cast condition that metal produces in smelting process is loose, optimize heterogeneous microstructure, owing to having preserved complete metal streamline, the mechanical performance of forging is generally better than the foundry goods of same material simultaneously.The strength member that in associated mechanical, load is high, condition of work is severe, except sheet material, section bar or the weldment of the better simply available rolling of shape, adopts forging more.In general forging is that the first step that belongs to materials processing is called " cogging ".

Described hot rolling: by antivibration bar alloy material 50 * 50mm blank, carry out hot rolling after being placed at 1200 ± 10 ℃ of temperature heating, insulation, be rolled into the rectangular bar of 13 * 25mm.

Antivibration bar alloy material becomes the steel of the mode various geometric cross section shapes that blank is rolled into of heating for 50 * 50mm blank by hammer cogging.Different according to sectional shape shape, be divided into simple section, compound section or three kinds of shaped steel such as special-shaped section and die rolled section.

(1) hot rolling can significantly reduce energy consumption, reduces costs.During hot rolling, plastic deformation is high, and resistance of deformation is low, has greatly reduced the energy consumption of flow of metal.

(2) hot rolling can improve the process industrial art performance of metal and alloy, and the coarse grain that is about to as-cast condition is broken, and significantly crack healing, reduces or eliminates casting flaw, as-cast structure is changed into the Deformation structure of refinement, puies forward heavy alloyed processing characteristics.

(3) antivibration bar alloy material is by the large ingot casting of hot rolling adopting, and heavy reduction rolling, has not only improved production efficiency, and has created condition for improving mill speed, the serialization that realizes the operation of rolling and automation.

(4) in fact hot-rolled process belongs to the essential step that middle manufacturing procedure is formation finished product blank.

Described heat treatment successively comprises: (1) solution treatment: the end cap material 13*25mm material after hot rolling is laid in to solution treatment in bell-jar hydrogen protection stove; (2) Ageing Treatment: the bar after solution treatment is also placed in to hydrogen shield stove and carries out Ageing Treatment.

Solution treatment is to equate to obtain uniform supersaturated solid solution in order to dissolve carbide in matrix, γ ', again the hardening constituent such as tiny, the carbide that is evenly distributed of precipitate particle and γ ' while being convenient to timeliness, eliminate the stress producing due to cold and hot working simultaneously, make alloy generation recrystallization.Secondly, solution treatment is in order to obtain suitable grain size, to guarantee alloy high-temp creep-resistant property.The temperature range of solution treatment between 980 ~ 1250 ℃, is mainly selected according to separating out mutually in each alloy with dissolution law and instructions for use greatly, to guarantee the condition of separating out of main hardening constituent necessity and certain grain size.The alloy using for long term high temperature, requiring has good high-temperature and durable and croop property, should select higher solid solubility temperature to obtain larger grain size; The alloy that uses and require good room temperature hardness, yield strength, hot strength, impact flexibility and fatigue strength for middle temperature, can adopt lower solid solubility temperature, guarantees less grain size.When high temperature solid solution is processed, various precipitated phases all progressively dissolve, simultaneously grain growth; During low temperature solution treatment, not only there is the dissolving of main hardening constituent, and may have separating out of some phase.For the low alloy of degree of supersaturation, conventionally select cooling velocity faster; For the high alloy of degree of supersaturation, be generally cooling in air.

Ageing Treatment refers to that alloy workpiece is through solution treatment, and cold plastic deformation or casting, after forging, keep its performance, shape, the Technology for Heating Processing of size time to time change in higher temperature placement or room temperature.If adopt, workpiece is heated to higher temperature, and the short period carry out the aging treatment process of Ageing Treatment, be called artificial aging and process, the aging phenomenon occurring if workpiece is placed on to long storage time under room temperature or natural conditions, is called natural aging treatment.The third mode be oscillating aging from the eighties from the beginning of progressively entering the practical stage, oscillating aging is processed and not to be heated also time-consuming unlike natrual ageing in the situation that, with the vibration that applies certain frequency to work, its internal stress is released, thereby reaches the object of timeliness.The object of Ageing Treatment, the internal stress of elimination workpiece, stabilizing tissue and size, improve mechanical performance etc.

In manufacture of materials, in order to stablize casting dimension, often foundry goods is at room temperature placed for a long time, just then carry out machining.This measure is also referred to as timeliness.But this timeliness does not belong to metal heating processing technology.

Described end cap Vehicle Processing: the 13*25mm material after Ageing Treatment is machined, be processed into the end cap of required size.

Technique effect of the present invention: the antivibration bar assembly of AP1000 unit steam generator of the present invention, comprising: the antivibration bar of V-shape structure and be located at respectively two end caps at antivibration bar two ends.Described antivibration bar is selected 405 stainless steel materials; Described end cap is selected 690 nickel-bass alloy materials, with facilitate with AP1000 nuclear power generating sets steam generator in U-shaped pipe be welded and fixed, U-shaped pipe is also 690 nickel-bass alloy materials.Described end cap upsetting pressure is fixedly on antivibration bar, prevents that end cap from occurring pulling in the assembling of antivibration bar assembly and described U-shaped pipe, welding process.Above-mentioned antivibration bar assembly is simple in structure, and product quality meets the accurate requirement of steam generator to antivibration bar in nuclear power station, safer during use.The preparation method of this antivibration bar, through strict preparation section, has guaranteed the technological requirement to the antivibration bar assembly of steam generator in nuclear power station, has guaranteed quality, has improved security.Described end cap upsetting pressure is fixed on described antivibration bar, prevents that end cap from occurring pulling in the assembling of antivibration bar assembly and described U-shaped pipe, welding process.During concrete enforcement, the central authorities of described end cap and the part flattening that is close to end cap two ends on antivibration bar.

Accompanying drawing explanation

Fig. 1 is the structural representation of the antivibration bar assembly of AP1000 unit steam generator of the present invention, Reference numeral: 1--antivibration bar, 2--end cap.

The specific embodiment

Embodiment 1

As Fig. 1, the preparation method of the antivibration bar assembly of the AP1000 unit steam generator of the present embodiment, comprising: the preparation of antivibration bar bar, the preparation of end cap, antivibration bar bar bend moulding, end cap assembling, upsetting pressure, inspection, clean and packaging process.

Described antivibration bar bar bends moulding: by antivibration bar bar on request size overall length add 50mm allowance and cut off, set angle bends antivibration bar, the antivibration bar after bending is placed on surface grinding machine, and bent angle buildup area is carried out to reconditioning to drawing requirement.

Described end cap assembling: by the end cap of producing according to end cap preparation method, with alcohol, dab the endoporus of washing end cap surface and line excision forming, with alcohol, stainless steel bars is cleaned simultaneously, after cleaning up, deburring, bite mark, protrusion metal or wedge angle; Stainless steel bar is inserted to cap end, alignment angle is assembled again.

Described upsetting pressure comprises: (1) pulling-out force procedure qualification: the end cap having assembled and carry out after upsetting pressure is carried out to pulling-out force evaluation, make cap bag under the pulling force of minimum 4448N, position is not moved; End pulling-out force under different pressures makes a record, and chooses most suitable pressure, as the pressure process parameter in upsetting pressure operation; (2) upsetting pressure: cap end is put into upsetting pressure mould, respectively upsetting pressure is carried out in the position at the contiguous end cap two ends on the middle position of end cap and antivibration bar with hydraulic press, depress maintenance pressure off-load after 10 seconds behind location, guarantee to meet drawing requirement after the upsetting pressure of cap end.Upsetting pressure position on antivibration bar has everywhere, and each two place, contiguous end cap end is spacing for cap end is carried out, and prevents that end cap is subjected to displacement on antivibration bar.

Described inspection: (1) flatness detects, and measures in detection platform with clearance gauge; (2) size detection, uses digimatic micrometer measurement products; (3) angle detects, and with digital display angle measuring instrument, measures; (4) visual detection, carries out visual detection to workpiece by part, guarantees surperficial zero defect, the roughness measuring instrument measurement of creeping for surface roughness; (5) surface finish measurement, measures with roughness instrument or contrast sample piece; All size detection results should meet drawing requirement.

Described clean: by relevant regulations, bar to be cleaned, guarantee that finished surface does not have rust staining, dust and other pollutants, (1) metal of sulphur, lead, mercury, cadmium and other low melting points, and their alloy and compound, halogen-containing material is all forbidden for processes such as the preparation of antivibration bar, test, check and packings; (2) lubricant, cuttings liquid and cleaning agent do not contain above-mentioned substance yet; Molykote, politef and other poly-fluorine materials also ban use of.

Embodiment 2

The preparation method of the antivibration bar bar in above-described embodiment 1, comprises following operation successively: induction furnace smelting, heat analysis, forging, hot rolling, the first heat treatment, performance test (stretching, hardness) and metal lographic examination, product analysis, cold-drawn, the second heat treatment, cold working, performance test (stretching, hardness) and grain size check, dimension control, mark, clean, report.

A. induction furnace is smelted: when alloy material is smelted, at induction furnace bottom placement nickel plate, pure iron, crome metal, load in mixture closely knit, after fusing 70%, add 2% the slag charge always feeding intake to make steel, record molten steel temperature and reach after tapping temperature molten steel to fall down in ladle, after calm 1-2 minute, pour into steel ingot bar.Every 40-50kg of steel ingot weight, steel ingot diameter microcephaly 140mm, major part 155mm.

B. heat analysis: (1) sampling: apart from car beyond the head of ingot, ingot tail 20mm scope or dig sample for chemical analysis; (2) each heat (batch) number is got to the chemical analysis that a sample for chemical analysis is measured every stove steel, and screen by content standard data.Melting chemical analysis should meet following table and require:

The trade mark

C

Mn

P

S

Si

Cr

Ni

Fe

Al

405

≤0.08

≤1.00

≤0.040

≤0.030

≤1.00

11.5~14.5

≤0.60

Surplus

0.10-0.30

C. forge: the steel ingot after analysis is qualified is forged into the steel billet of 50*50mm size at 1150-1220 ℃;

(1) Forge Heating thermometer:

(2) forge: forging compression ratio is: 4-6; Forge size: 50*50mm; More than square billet major part excision 100mm, more than microcephaly excises 50mm; Forging stock surface treatment: the reconditioning that strips off the skin of forging stock surface, remove the blemish such as surperficial wrinkle crackle pipe.

D. hot rolling: steel billet is placed at 1050-1100 ℃ of temperature and carries out hot rolling, be rolled into the bar of ф 16mm, after hot rolling is cooling will by root check surface quality crackle, fold, scab, be mingled with, and thoroughly polishing is clean;

(1) billet heating temperature table is as follows:

(2) rolling: adjust work the outward appearance of rolled products is wanted to straight, be rolled into the silk material of ф 16mm; After milling material is cooling will by root check surface quality crackle, fold, scab, be mingled with, and thoroughly polishing is clean; Rolling ratio: >=5.

E. the first heat treatment: the bar after hot rolling is carried out to vacuum annealing processing, and temperature remains on 800 ℃ of left and right, between annealing soak, temperature deviation is no more than 10 ℃; Annealing temperature is:

F. performance test: (1) is appointed and got one group of sample each stove lot number of the hot rolled rod after heat treatment; (2) sample is carried out respectively to tension test, hardness test, Metallographic Analysis and product analysis, substandard product is got rid of;

1. stretch test result should meet following table requirement:

Performance	Room temperature	350℃
			Prescribed strength Rp0.2 (Mpa)	≥170	≥145
Tensile strength Rm (Mpa)	≥415	≥370
			Elongation after fracture A(%)	≥20	info
Contraction percentage of area Z(%)	≥45	info

When bar≤25mm, the longitudinal axis of sample is consistent with the center of bar, and the useful part of sample must not be less than the diameter of bar apart from the distance of bar heat treated end.

2. hardness test should meet:

Performance	Room temperature
		Hardness (HB)	≤207

Hardness test should be in the hardness of the middle part of bar center to face check bar.

3. Metallographic Analysis should meet:

4. product analysis: do material product analysis in the sampling of the two ends of tensile sample, analysis result should meet:

5. retrial and another warm are processed: if the stretch test result of 5.1 bars is undesirable, can cuts at the contiguous position of failed test sample two additional samples and carry out tension test, only when two additional specimen test results all meet the demands, can check and accept;

If 5.2 any a collection of bar heat treatments are improper, cause mechanical property defective, can process this batch of material another warm, but heat treated number of times should be over twice again; After another warm is processed, this batch of material is carried out to all checks (except the check of chemical analysis and non-metallic inclusion) of technical conditions regulation; All checks all should meet the requirement of these technical conditions.

G. cold-drawn: (1) first carries out soft annealing processing is incubated 40 minutes at 720-750 ℃ of temperature; (2) by glomerocryst mould drawing successively for deformation requirements, and effects on surface micro-crack place carries out reconditioning, and reconditioning can be carried out the drawing of lower road to zero defect.

During cold-drawn, drawing deflection is φ 16 → φ 14 → φ 12.5 → φ 11 → 4.8 * 12.8 → 4.4 * 12.5 → 4.028 * 12.19.

Soft annealing resolving system is as follows:

Steel grade	Specification	Heating-up temperature ℃	Temperature retention time (dividing)	The type of cooling
					SA-479 TYPE405	Before each cold-drawn	720-750℃	≥40	Air cooling

H. the second heat treatment: will be pulled to finished-product material and be laid in bell-jar heat-treatment furnace, under hydrogen shield state, heat-treat, between annealing soak temperature deviation should be no more than ± 10 ℃, heat treatment temperature and other require according to the form below requirement to carry out:

I. finished product processing: to the bar after heat treatment align, the cold working operation such as polishing, the thickness after processing, width, torsion resistance, linearity equidimension should meet following table and require:

J. performance test: bar is carried out to mechanical property test, hardness test, grain size check, and the bar requiring is got rid of to not meeting the specification.

1. mechanical property test should meet:

Performance	Room temperature
		Prescribed strength Rp0.2 (Mpa)	240-550
Tensile strength Rm (Mpa)	415-585
		Elongation after fracture A(%)	≥15

2. hardness test should meet:

Performance	Room temperature
		Hardness	HB≤207 or HRB≤93

3. grain size check:

The method of inspection	Rank requirement
		ASTM E112	5 grades or thinner

If the mechanical property of bar does not meet specification requirement, can carry out retrial in the contiguous double sampling in position of this sample, the requirement that all should meet the specification of retrial result.

K. dimension control: (1) visual examination: to every material surface by Zhi Jinhang visual inspection, require the defects such as flawless, scuffing, bar does not allow to carry out any repair by welding, and its surface roughness is checked by Zhi Jinhang, to suspicious district, need increase inspection, record result and answer Ra≤1.6 μ m; (2) dimensional gaughing: take out 5% material and carry out dimensional gaughing, guarantee that scantling meets the tolerance of 4.028 ± 0.013* (12.19).

L. mark: should accurately make sign or tie on a label on every material, writing maker's name exactly, material trademark and specification; Hearth number, lot number and piece number; Contract number or order number.

M. clean: by relevant regulations, bar to be cleaned, guarantee that finished product Surface of Rod Bar does not have rust staining, dust and other pollutants; Rod iron can not contact the material that itself and integrality is had to harm.The incompatibility material of main metal has lead, zinc, copper, aluminium, cadmium, tin, mercury, sulphur, arsenic, boron and general low-melting alloy and their compound thereof, in addition, the fluoride, sulfate, chloride and the acid chloride that due to the degraded of plastic containing chlorine, produce are a potential danger, answer careful selection adhesive tape, marking pen, couplant, bleeding agent and coating; If first use milling tools will guarantee that milling tools does not have contaminated.

Embodiment 3

The preparation method of end cap in above-described embodiment 1, comprises following operation successively: intermediate frequency furnace smelting, electroslag refining, heat analysis, forging, ultrasonic examination, hot rolling, heat treatment, performance test, product analysis, end cap Vehicle Processing, dimension control, mark, clean.

A. induction furnace is smelted: when alloy material is smelted, at induction furnace bottom placement nickel plate, pure iron, crome metal, load in mixture closely knit, after fusing 70%, add 2% the slag charge always feeding intake to make steel, recording molten steel temperature reaches after tapping temperature molten steel to fall down in ladle, after calm 1-2 minute, pour into steel ingot bar, every 40-50kg of steel ingot weight, steel ingot diameter microcephaly 140mm, major part 155mm.

B. electroslag refining: alloy material, after smelting, could improve degree of purity, the structural homogenity of steel alloy effectively through electroslag refining, improves surface, the inherent quality of steel ingot, improves the performance of steel alloy.When electroslag refining is complete, carry out feeding, after feeding 3-5 minute, cooling >=3 minute de-ingot.Then carry out ESR ingot surface treatment: surface strips off the skin, reconditioning.

C. heat analysis: after steel ingot is cooling, sampling is carried out chemical analysis to chemical element on steel ingot.(1) sampling: apart from car beyond the head of ingot, ingot tail 20mm scope or dig sample for chemical analysis; (2) each heat (batch) number is got to a sample for chemical analysis, test method by < < ASTM E38 nickel-chromium and nickel-chromium-ferro alloy chemical analysis method > > requirement is carried out chemical analysis analysis to material, and screen by content standard data, melting chemistry should meet:

Element

Composition limit %

Element

Composition limit %

Element

Composition limit %

Element

Composition limit %

Ni

58.0min

Cr

27.0-31.0

Fe

7.0-11.0

Mn

0.5max

Si

0.5 max

C

0.015-0.030

Al

0.50 max

Ti

0.50 max

B

0.005 max

N

0.05 max

S

0.010 max

P

0.015 max

Cu

0.20 max

Nb

0.10 max

Mo

0.10 max

Co

0.05 max

Mg

info

Ta

info

D. forge: the steel ingot after analysis is qualified is forged into the steel billet of 50*50mm size at 1240-1260 ℃ of temperature.

1. before forging, will carry out annealing in process to steel ingot, heat treatment temperature according to the form below carries out:

2. deformation technique: forging compression ratio is: 4-6; More than square billet major part excision 100mm, more than microcephaly excises 50mm; Forge square billet and be of a size of 50*50mm; Forging stock surface treatment: the reconditioning that strips off the skin of forging stock surface, remove the blemish such as surperficial wrinkle crackle pipe.

E. ultrasonic examination: the square rod of the reconditioning that strips off the skin is carried out to ultrasound examination by detection method and the acceptance criteria stipulated in < < bar Dynamic Non-Destruction Measurement condition > >.

F. hot rolling: square billet is placed at 1200 ℃ of left and right temperature and carries out hot rolling, be rolled into the material of 13*25mm, hot-rolled temperature deviation is no more than 10 degree, after hot rolling is cooling will by root check surface quality crackle, the defect such as fold, scab, be mingled with, and thoroughly polishing is clean;

1. the square billet after forging first carries out annealing in process before hot rolling, and annealing temperature is as following table:

2. roll control: end cap is rolled into 13*25mm with material; The defect such as will check face crack by root after milling material is cooling, fold, scab, be mingled with, and excision or thoroughly polishing is clean; Rolling ratio is >=5.

G. heat treatment: 1. solution treatment: the end cap material 13*25mm material after hot rolling is laid in to solution treatment in bell-jar hydrogen protection stove, and heat treatment temperature is as following table:

Steel grade	Specification	Heating-up temperature ℃	Temperature retention time (h)	The type of cooling
					SB-166 UNS N06690	13*25mm	Concrete heat treatment temperature is as follows	≥1	Air cooling

Phosphorus content wt.%	Minimum holding temperature ℃
		0.015	1016
0.016	1023
		0.017	1030
0.018	1036
		0.019	1043
0.020	1049
		0.021	1055
0.022	1060
		0.023	1066
0.024	1071
		0.025	1076
0.026	1081
		0.027	1085
0.028	1090
		0.029	1094
0.030	1099

Wherein, holding temperature deviation be no more than ± 10 ℃.

2. Ageing Treatment: the bar after solution treatment must carry out Ageing Treatment, and Ageing Treatment also should be carried out in hydrogen shield stove, and heat treatment temperature is:

Steel grade	Specification	Heating-up temperature ℃	Temperature retention time (h)	The type of cooling
					SB-166 UNS N06690	13*25mm	704～732℃	8-12h	Air cooling

Wherein, Ageing Treatment should be over ± 10 ℃ at insulation Qimen temperature deviation.

3. solid solution and Ageing Treatment record should be listed in certificate of quality file, and heat treatment record should comprise holding temperature and deviation, temperature retention time, the rate of heat addition, heating atmosphere and the type of cooling.

H. performance test:

1. sampling: each stove lot number is appointed and got a sample and do mechanical property test, the longitudinal axis of tensile sample be parallel to bar axially.The useful part of tensile sample is at least one times of diameter of rod from bar end; The residing position of the longitudinal axis of tensile sample is bar center; Sample has enough length, so that all test consumptions and the required samples of possibility retrial such as intercepting hardness sample, metallographic specimens.

2. tension test should meet:

Wherein, tension test adopts the standard specimen of gauge length 50mm, diameter 12.5mm.

3. Metallographic Analysis: Metallographic Analysis is done in the sample close position sampling in tension test, and Metallographic Analysis examination criteria is:

4. macro-erosion test: appoint one of extraction to carry out macroetch test for every batch, should test at crop cross section position, the two ends of bar, with the naked eye or by 10 times of following magnifying glasses evaluate, do not allowed the defects such as shrinkage cavity, cavity, crackle, slag inclusion and pin hole.

5. Huey test: the every batch of bar is got one group of (two) sample on should any bar after Ageing Treatment and carried out Huey test, sample is got in stretching adjacent locations, sample should first be processed through sensitization, sensitization resolving system be 675 ℃ ± 5 ℃ insulation 1 hour, sample corrosion rate should be less than 20mdd (milligram/square decimeter. day).

6. near product analysis: each stove is appointed and got the product analysis that a sample is done material tensile sample, and product analysis result should meet:

Element

Composition limit %

Element

Composition limit %

Element

Composition limit %

Element

Composition limit %

Ni

58.0min

Cr

27.0-31.0

Fe

7.0-11.0

Mn

0.5max

Si

0.5 max

C

0.015-0.030

Al

0.50 max

Ti

0.50 max

B

0.005 max

N

0.05 max

S

0.010 max

P

0.015 max

Cu

0.20 max

Nb

0.10 max

Mo

0.10 max

Co

0.05 max

Mg

info

Ta

info

I. end cap Vehicle Processing: the 13*25mm material after Ageing Treatment is made a service test, and qualified material is machined, be processed on request φ 22.86 ± 0.05, long 50.8 ± 0.07 end cap product.

J. dimensional gaughing: 1, to every material surface by Zhi Jinhang visual inspection, end cap has not allowed indentation, burr, lobe, metal to heave.2, material is carried out to dimensional gaughing, the inspection quantity of every stove material should be greater than 5%.

K. mark: should accurately make sign or tie on a label on every material, should comprise: job number, material trademark and specification, bar piece number, hearth number, heat treatment heat (batch) number, bar maker's name.

L. clean: by relevant regulations, bar to be cleaned, guarantee that finished product end cap surface does not have rust staining, dust and other pollutants.

Claims (1)

1. a preparation method for the antivibration bar assembly of nuclear power generating sets steam generator, is characterized in that described antivibration bar assembly comprises: the antivibration bar of V-shape structure and be located at respectively the end cap at antivibration bar two ends; Described antivibration bar is selected 405 stainless steel materials; Described end cap is selected 690 nickel-bass alloy materials;

Described preparation method comprises that antivibration bar bar bends the operation of moulding, it comprises: by antivibration bar bar on request size overall length add 50mm allowance and cut off, set angle bends antivibration bar, and the antivibration bar after bending is placed on surface grinding machine, and bent angle buildup area is carried out to reconditioning;

The preparation method of described antivibration bar bar, comprises following operation successively: induction furnace smelting, forging, hot rolling, the first heat treatment, cold-drawn, the second heat treatment, finished product processing;

Described induction furnace is smelted: when alloy material is smelted, in induction furnace bottom, place nickel plate, pure iron, crome metal, and load in mixture closely knit, after fusing 70%, add 2% slag charge of the weight that always feeds intake to make steel, record molten steel temperature and reach after tapping temperature molten steel to fall down in ladle, after calm 1-2 minute, pour into steel ingot;

Described forging: the steel ingot of the antivibration bar alloy material after smelting by induction furnace is forged into after 1150-1220 ℃ of heating and insulation to the steel billet of 50*50mm size, and effects on surface finishing reconditioning;

Described hot rolling: by antivibration bar alloy material 50 * 50mm blank, carry out hot rolling after being placed at 1050-1100 ℃ of temperature heating, insulation, be rolled into the bar of ф 16mm;

Described the first heat treatment: the bar after hot rolling is carried out carrying out vacuum annealing processing after surface finish, reconditioning again, and φ 16 antivibration bar alloy material bars heat, are incubated at 800 ℃ ± 10 ℃ of temperature;

Described cold-drawn: first carry out soft annealing processing, be incubated 40 minutes at 720-750 ℃ of temperature; By glomerocryst mould drawing successively for deformation requirements, and effects on surface micro-crack place carries out reconditioning, and reconditioning can be carried out the drawing of lower road to zero defect;

Described the second heat treatment: the material that antivibration bar alloy bar is pulled to finished product is laid in bell-jar heat-treatment furnace, under hydrogen shield state, heat-treat, between annealing soak, temperature is 788-815 ℃, insulation is more than 3 hours, then, to be no more than the cooling velocity of 28 ℃/h, slowly cool to below 610 ℃, then air cooling is to room temperature;

Described finished product processing: the bar after processing is aligned, polished.