CN103934646B - A kind of preparation method of Shockproof strip assembly for steam generator of nuclear power unit - Google Patents

Abstract

A kind of preparation method of Shockproof strip assembly for steam generator of nuclear power unit, described anti-vibration bar assembly includes: the anti-vibration bar of V-shape structure and be respectively arranged on two end caps at anti-vibration bar two ends, anti-vibration bar selects 405 stainless steel materials, and end cap selects 690 nickel-bass alloy materials；The preparation method of described anti-vibration bar assembly, including: the preparation of anti-vibration bar, the preparation of end cap, bend molding, end cap assembling, upsetting pressure, check, clean and packaging process.The anti-vibration bar assembly of AP1000 unit steam generator of the present invention, simple in construction, product quality meets the steam generator rigorous to anti-vibration bar in nuclear power station, safer during use.The preparation method of this anti-vibration bar, through strict preparation section, it is ensured that technological requirement to the anti-vibration bar assembly of steam generator in nuclear power station, it is ensured that quality, improves safety.

Description

A kind of preparation method of Shockproof strip assembly for steam generator of nuclear power unit

The application is divisional application, the application number of original application: 201210297066.2, the applying date: 2012-8-20, invention Create title " AP1000 Shockproof strip assembly for steam generator of nuclear power unit ".

Technical field

The present invention relates to the preparation method of a kind of AP1000 Shockproof strip assembly for steam generator of nuclear power unit.

Background technology

U-shaped heat transfer tube in nuclear power station is that in primary Ioops system pressure border, most critical is also the weakest link.Once Tube vibration destroys, and must change steam generator, and this certainly will cause the huge waste of manpower, financial resources and event, also increases The maintainer danger by radioactivity irradiation.Therefore, solve steam generator to break and run affairs therefore be the safety being related to nuclear power station Property and make nuclear power station have the key issue of competitiveness and vitality.

To eliminate the root that vibration produces, it is generally required to the elbow of U-shaped heat-transfer pipe installs additional in a vapor generator as far as possible How anti-vibration bar, provide the anti-vibration bar assembly that a kind of resistance to shock is good, and preparation method convenient and simple, that precision is high, is this The technical barrier in field.

Summary of the invention

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

The anti-vibration bar assembly of the AP1000 unit steam generator of the present invention, comprising: the anti-vibration bar of V-shape structure and point Other fixed cover is located at two end caps at anti-vibration bar two ends.

Described anti-vibration bar selects 405 stainless steel materials；Described end cap selects 690 nickel-bass alloy materials, unit steam generation U-shaped heat transfer tube in device is also nickel-bass alloy material, and the two material is identical, can facilitate and be welded with described end cap by U-shaped heat transfer tube Connect fixing.690 nickel-bass alloy materials have the feature that corrosion resistance is strong simultaneously.

Described end cap upsetting pressure is fixed in described anti-vibration bar, prevent end cap anti-vibration bar assembly and described U-tube assembling, Welding process occurs pull.When being embodied as, the central authorities of described end cap and the part at neighbouring end cap two ends in anti-vibration bar Flatten.

The preparation method of a kind of described anti-vibration bar assembly, in turn includes the following steps:

A, anti-vibration bar bar is bent the operation of molding: anti-vibration bar bar size overall length on request is added 50mm allowance and carries out Cutting off, set angle bends anti-vibration bar, and the anti-vibration bar after bending is placed on surface grinding machine, and bent angle buildup area is carried out reconditioning；

The operation of B, end cap assembling: dabbed by end cap ethanol and wash end cap surface and line cutting endoporus, simultaneously will with ethanol Stainless steel bars is carried out, after cleaning up, and deburring, bite mark, protrusion metal or wedge angle；Again by the end of stainless steel bars Portion inserts in the endoporus of end cap.

C, the operation of upsetting pressure: (1) pulling-out force procedure qualification: the end cap after having assembled and having carried out upsetting pressure is carried out pulling-out force Evaluation, makes cap bag under lowest pull, and position is not moved；End pulling-out force at various pressures makes a record, and chooses Most suitable pressure, as the pressure process parameter in upsetting pressure operation；(2) upsetting pressure: end cap is put in upsetting pressure mould, uses hydraulic pressure Machine position to the neighbouring end cap two ends on the middle position of end cap and anti-vibration bar respectively carries out upsetting pressure, and pressure keeps pressure behind location Power off-load after 10 seconds.Upsetting pressure position in anti-vibration bar has everywhere, at neighbouring end cap end each two, for end cap is carried out spacing, End cap is prevented to be subjected to displacement in anti-vibration bar.

The preparation method of described anti-vibration bar bar, in turn includes the following steps:

A, induction furnace are smelted: place nickel plate, pure iron, crome metal when alloy material is smelted bottom induction furnace, and load in mixture close Real, after fusing 70%, add total charged material weight 2% slag charge make steel, record molten steel temperature and reach after tapping temperature steel Water falls down in ladle, pours into steel ingot bar, be effectively improved the degree of purity of steel alloy, even tissue after calm 1-2 minute Property, improve the surface of steel ingot, inherent quality, improve the performance of steel alloy.

Anti-vibration bar alloy material requires pure；Chemical composition is accurately, uniformly；And have the structural state specified.Use sensing Stove has a series of unarguable advantage.Owing to it does not has the polluter in the presence of other equipment, it is ensured that it is right to obtain Metal material the purest for carbon and other impurity；The uniform of alloy is ensured owing to having electric power stirring metal bath Property；Ensure to obtain exactly and temperature required for keeping metal and make temperature be uniformly distributed along whole bath temperature；Eliminate Hot-spot；Owing to its thawing speed is fast, iron loss is few, thus is to obtain regulation alloying component, minimum unit accurately Biscuiting is damaged and is created favorable conditions；When changing the refining chemical composition metal different from forehearth, it has the highest mobility.

B, forging: the alloy material steel ingot after being smelted by induction furnace is forged after 1150-1220 DEG C of heating and insulation Become the steel billet of 50*50mm size；By delivering to lower step hot rolling blank operation after surface finish reconditioning.

Forging is that one utilizes metal forming machinery that metal stock is applied pressure so that it is produces plastic deformation and has one to obtain Determine mechanical performance, definite shape and the processing method of size forging, can eliminate what metal produced in smelting process by forging The defects such as cast condition is loose, optimize heterogeneous microstructure, simultaneously because save complete metal streamline, the mechanical performance one of forging As be better than the foundry goods of same material.The strength member that in associated mechanical, load is high, working condition is severe, except shape is better simply can Outside sheet material, section bar or weldment with rolling, use forging more.In general forging is belonging to the first step of materials processing and is called " cogging "

C, hot rolling: by anti-vibration bar alloy material 50*50mm blank, heat at a temperature of being placed in 1050-1100 DEG C, be incubated laggard Row hot rolling, is rolled into the bar of φ 16mm.

It is various that blank is rolled into by the way of hammer cogging becomes the heating of 50*50mm blank by anti-vibration bar alloy material The steel of geometric cross section shape.Different according to sectional shape shape, it is divided into simple section, compound section or special-shaped section and cycle Three kinds of shaped steel such as section.

(1) hot rolling can significantly reduce energy consumption, reduces cost.During hot rolling, plastic deformation is high, and resistance of deformation is low, greatly reduces The energy expenditure of flow of metal.

(2) hot rolling can improve the process industrial art performance of metal and alloy, will as-cast condition coarse grain crush, significantly Crack healing, is reduced or eliminated casting flaw, and as-cast structure is changed into the Deformation structure of refinement, puies forward heavy alloyed processability Energy.

(3) anti-vibration bar alloy material is by the big ingot casting of hot rolling used, heavy reduction rolling, not only increases production effect Rate, and create condition for improving mill speed, the serialization realizing the operation of rolling and automatization.

(4) hot-rolled process actually belongs to immediate processing steps is the essential step forming finished product blank.

D, the first heat treatment (annealing heat treatment): for ensureing that the surface quality of anti-vibration bar alloy material is to the bar after hot rolling Carrying out vacuum annealing process after again carrying out surface finish, reconditioning, φ 16 anti-vibration bar alloy material bar is in temperature 800 DEG C ± 10 Carry out at DEG C heating, being incubated.

Annealing heat treatment is divided into full annealing, partial annealing and stress relief annealing.The mechanical property of annealed material is permissible Detect with tension test, it is also possible to detect by hardness test.Intermediate heat-treatment is again heat treatment in advance, is for eliminating upper one The defect of procedure or make operation below be processed well and the heat treatment that arranges.It is that metal is heated slowly to uniform temperature, Keep enough time, then with a kind of metal heating processing technology of Reasonable Speed cooling.

The purpose of annealing

1. improve or eliminate iron and steel at the various tissue defects casting, forge and press, roll and being caused in welding process and Residual stress, prevents workpiece deformation, cracking.

2. workpiece is softened to carry out machining.

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

4. perform tissue for finished heat treatment (quench, be tempered) to prepare.

E, cold-drawn: first carry out soft annealing process, be incubated 40 minutes at a temperature of 720-750 DEG C；By deformation requirements with poly- Brilliant mould drawing successively, and to carrying out reconditioning at crizzle, the drawing of lower road after reconditioning to zero defect, can be carried out.

Cold-drawn be by hot rolling after the anti-vibration bar softened annealing of alloy bar after reprocess at cold state, with Production method to all kinds of precisions, high-precision product or intermediate products.

F, the second heat treatment: anti-vibration bar alloy bar is pulled to finished-product material and is laid in bell-jar heat-treatment furnace, at hydrogen Carrying out heat treatment under gas shielded state, during annealing insulation, temperature is 788-815 DEG C, is incubated more than 3 hours；Then to be less than 28 DEG C/h of rate of cooling slow cooling are to less than 610 DEG C, then air cooling is to room temperature.

Metal heat treatmet is one of important process in machine-building, and compared with other processing technique, heat treatment is the most not Change the shape of workpiece and overall chemical composition, but by changing the microscopic structure of inside workpiece, or change surface of the work Chemical composition, give or improve the serviceability of workpiece.It is characterized in improving the inherent quality of workpiece, and this is generally not meat Eye can be seen.

For making metal works have required mechanical property, physical property and chemical property, except reasonable selection material and Outside various forming technologies, Technology for Heating Processing is the most requisite.Iron and steel is material most widely used in mechanical industry, iron and steel Microscopic structure is complicated, can be controlled by heat treatment, so the heat treatment of iron and steel is the main contents of metal heat treatmet.Separately Outward, aluminum, copper, magnesium, titanium etc. and alloy thereof also can change its mechanics, process based prediction model by heat treatment, to obtain not Same serviceability.

G, finished product are processed: the bar after processing is aligned, polished.

The rectification carrying out the shape defect of Metal Forming product, is one of important finishing procedure, and cold-drawn material exists Production process or cooling afterwards and transportation often produce various shapes defect, the bending of such as section bar tubing, Wave, wooden dipper are bent, the defects such as bending can be made to be eliminated under external force by various equipment for straightening, make product reach qualified Perfect condition.

(1) corase grind: the polishing of product is in addition to smooth surface to be made is smooth, it is often more important that top layer should be reduced as far as possible and damage Wound.Every one branner's sequence must be driven off the deformation layer that front one procedure causes (at least should make the deformation that front one procedure produces Layer is reduced to the deformation layer degree of depth that this procedure produces) rather than only the polishing scratch of front one procedure is removed；Meanwhile, this road Operation itself should accomplish to reduce damage as far as possible, in order to carries out next process.The deformation that last one branner's sequence produces Layer depth should be the most shallow, it is ensured that can remove in lower one polishing process.This process is it is noted that prevent metal from too generating heat.

(2) fine grinding: the deeper polishing scratch that the purpose of fine grinding stays when being and eliminate corase grind, lays a solid foundation for next step polishing. Fine grinding is typically to carry out on sand paper, and sand paper divides waterproof abrasive paper and abrasive paper for metallograph.Generally waterproof abrasive paper is that SiC abrasive material is water insoluble, gold The abrasive material of phase sand paper has Alundum, carborundum, ferrum oxide etc., and property is the most extremely hard, in many arris, has good machinability Can, during fine grinding, available water carries out manual wet grinding or machinery wet grinding as lubricant, and generally using granularity is 240,320,400,600 4 Plant after waterproof abrasive paper polishes and can be polished, for softer metal, apply re-polishing after thinner abrasive paper for metallograph polishing.Sand Paper the most downward-sloping (in terms of operator direction), is pasted onto when grinding on plate glass, by after flat for sample flour milling on sand paper, Straight line a push-back forward leaves sand paper when returning, this be repeated, until old polishing scratch all disappears, and the side of obtaining on whole flour milling To consistent uniform new polishing scratch limit only, before often changing one sand paper, it is necessary to first wash sample and sand grains on hand with water, and wipe Dry, then sample half-twist is ground on secondary sand paper.During use, the water of flowing ceaselessly flows through from coated abrasive surface, in time Ground washes away overwhelming majority abrasive dust and the abrasive particle come off.So during whole polishing operation, the sharp corners of abrasive particle is all the time Contact with the surface of sample, keep the ablation that it is good.Another advantage of wet grinding is that the cooling effect of water can reduce The frictional heat produced at specimen surface during polishing, it is to avoid microscopic structure changes.Whole polishing operation can be on same equipment Complete.

The preparation method of described end cap, in turn includes the following steps: induction furnace smelting, forging, hot rolling, heat treatment, end cap Vehicle Processing；(requiring supplementation with the effect of each operation, purpose or technique effect)

Described induction furnace is smelted: places nickel plate, pure iron, crome metal when alloy material is smelted bottom induction furnace, and loads in mixture Closely knit, fusing 70% after, add total charged material weight 2% slag charge make steel, record molten steel temperature and reach handle after tapping temperature Molten steel falls down in ladle, pours into steel ingot after calm 1-2 minute.

Anti-vibration bar alloy material requires pure；Chemical composition is accurately, uniformly；And have the structural state specified.Use sensing Stove has a series of unarguable advantage.Owing to it does not has the polluter in the presence of other equipment, it is ensured that it is right to obtain Metal material the purest for carbon and other impurity；The uniform of alloy is ensured owing to having electric power stirring metal bath Property；Ensure to obtain exactly and temperature required for keeping metal and make temperature be uniformly distributed along whole bath temperature；Eliminate Hot-spot；Owing to its thawing speed is fast, iron loss is few, thus is to obtain regulation alloying component, minimum unit accurately Biscuiting is damaged and is created favorable conditions；When changing the refining chemical composition metal different from forehearth, it has the highest mobility.

Described forging: the steel ingot of the anti-vibration bar alloy material after being smelted by induction furnace 1150-1220 DEG C heating and The steel billet of 50*50mm size it is forged into after insulation；By delivering to lower step hot rolling blank operation after surface finish reconditioning.

Forging is that one utilizes metal forming machinery that metal stock is applied pressure so that it is produces plastic deformation and has one to obtain Determine mechanical performance, definite shape and the processing method of size forging, can eliminate what metal produced in smelting process by forging The defects such as cast condition is loose, optimize heterogeneous microstructure, simultaneously because save complete metal streamline, the mechanical performance one of forging As be better than the foundry goods of same material.The strength member that in associated mechanical, load is high, working condition is severe, except shape is better simply can Outside sheet material, section bar or weldment with rolling, use forging more.In general forging is belonging to the first step of materials processing and is called " cogging "

Described hot rolling: after by anti-vibration bar alloy material 50*50mm blank, heating at a temperature of being placed in 1200 ± 10 DEG C, being incubated Carry out hot rolling, be rolled into the bar of φ 13*25mm.

It is various that blank is rolled into by the way of hammer cogging becomes the heating of 50*50mm blank by anti-vibration bar alloy material The steel of geometric cross section shape.Different according to sectional shape shape, it is divided into simple section, compound section or special-shaped section and cycle Three kinds of shaped steel such as section.

(1) hot rolling can significantly reduce energy consumption, reduces cost.During hot rolling, plastic deformation is high, and resistance of deformation is low, greatly reduces The energy expenditure of flow of metal.

(2) hot rolling can improve the process industrial art performance of metal and alloy, will as-cast condition coarse grain crush, significantly Crack healing, is reduced or eliminated casting flaw, and as-cast structure is changed into the Deformation structure of refinement, puies forward heavy alloyed processability Energy.

(3) anti-vibration bar alloy material is by the big ingot casting of hot rolling used, heavy reduction rolling, not only increases production effect Rate, and create condition for improving mill speed, the serialization realizing the operation of rolling and automatization.

(4) hot-rolled process actually belongs to immediate processing steps is the essential step forming finished product blank.

The priority of described heat treatment includes: (1) solution treatment: tiled by the end cap material φ 13*25mm material after hot rolling Solution treatment in bell hydrogen resistance furnace gas shielded stove；(2) Ageing Treatment: the bar after solution treatment is also placed in hydrogen shield stove Carry out Ageing Treatment.

Solution treatment is equal to obtain uniform supersaturated solid solution in order to dissolve carbide in matrix, γ ', it is simple to time Again separate out the hardening constituents such as granule is tiny, be evenly distributed carbide and γ ' during effect, eliminate due to cold and hot working generation simultaneously Stress, makes alloy generation recrystallization.Secondly, solution treatment is to obtain suitable grain size, compacted to ensure that alloy high-temp resists Degeneration energy.The temperature range of solution treatment is about between 980 ~ 1250 DEG C, mainly according to separating out mutually in each alloy and dissolving Rule and use requirement select, to ensure the precipitation condition of main hardening constituent necessity and certain grain size.For long-term high The alloy that temperature uses, it is desirable to have preferable high-temperature and durable and croop property, higher solid solubility temperature should be selected bigger to obtain Grain size；Middle temperature is used and requires preferable room temperature hardness, yield strength, hot strength, impact flexibility and fatigue strength Alloy, relatively low solid solubility temperature can be used, it is ensured that less grain size.During higher temperature solid solution, various precipitated phases are the most progressively Dissolving, crystal grain is grown up simultaneously；During low temperature solution treatment, the dissolving of main hardening constituent, and may have the analysis of some phase Go out.For the alloy that degree of supersaturation is low, it is generally selected rate of cooling faster；For the alloy that degree of supersaturation is high, usually sky Gas cools down.

Ageing Treatment: refer to that alloy workpiece, through solution treatment, cold plastic deformation or casting, after forging, is put in higher temperature Put or room temperature keeps its performance, shape, the Technology for Heating Processing of size time to time change.According to by workpiece heat to higher temperatures Degree, and the short period carry out the aging treatment process of Ageing Treatment, referred to as artificial aging processes, if workpiece is placed on room temperature or Long storage time under natural conditions and the aging phenomenon that occurs, referred to as natural aging treatment.The third mode be oscillating aging from The eighties, vibration stress relief treatment did not then heat also time-consuming unlike natrual ageing situation from the beginning of stepping into the practical stage Under, make its internal stress be released with the vibration applying certain frequency to work, thus reach the purpose of timeliness.Ageing Treatment Purpose, eliminates the internal stress of workpiece, stabilizing tissue and size, improves mechanical performance etc..

In machinery production, for stable casting dimension, often foundry goods is placed for a long time, just then cut Processing.This measure is also referred to as timeliness.But this timeliness is not belonging to metal heating processing technology.

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

The technique effect of the present invention: the anti-vibration bar assembly of AP1000 unit steam generator of the present invention, structure letter Single, product quality meets the steam generator rigorous to anti-vibration bar in nuclear power station, safer during use.This anti-vibration bar Preparation method, through strict preparation section, it is ensured that technological requirement to the anti-vibration bar assembly of steam generator in nuclear power station, protects Demonstrate,prove quality, improve safety.Described end cap upsetting pressure is fixed in described anti-vibration bar, prevents end cap in anti-vibration bar assembly and institute State in the assembling of U-tube, welding process and occur pulling.When being embodied as, the central authorities of described end cap and neighbouring in anti-vibration bar The part at end cap two ends is flattened.

Accompanying drawing explanation

Fig. 1 is the structural representation of the anti-vibration bar assembly of AP1000 unit steam generator of the present invention, accompanying drawing mark Note: 1--anti-vibration bar, 2--end cap.

Detailed description of the invention

Embodiment 1

Such as Fig. 1, the anti-vibration bar assembly of the AP1000 unit steam generator of the present embodiment, comprising: V-shape structure is anti- Shake bar 1 and respectively fixed cover be located at two end caps 2 at anti-vibration bar two ends.

Described anti-vibration bar 1 selects 405 stainless steel materials (SA-479 TYPE405)；Described end cap 2 selects 690 nickel-base alloys Material (SB-166 UNS N06690).

Being crushed everywhere of neighbouring end cap two ends in the central authorities of described end cap 2 and anti-vibration bar 1.Anti-vibration bar 1 is located At two flattenings of end cap end symmetrical.

The preparation method of above-mentioned anti-vibration bar assembly, including: the preparation of anti-vibration bar bar, the preparation of end cap, anti-vibration bar bar Bend molding, end cap assembling, upsetting pressure, check, clean and the operations such as packaging.

Described anti-vibration bar bar bends molding: anti-vibration bar bar size overall length on request is added 50mm allowance and cuts Disconnected, set angle bends anti-vibration bar, and the anti-vibration bar after bending is placed on surface grinding machine, bent angle buildup area carries out reconditioning to drawing Requirement.

Described end cap assembling: end cap ethanol is dabbed and washes end cap surface and the endoporus of line excision forming, use wine simultaneously Stainless steel bars is carried out by essence, after cleaning up, and deburring, bite mark, protrusion metal or wedge angle；Again by stainless steel bars Inserting end cap, alignment angle is assembled.

Described upsetting pressure includes: (1) pulling-out force procedure qualification: pull the end cap after having assembled and having carried out upsetting pressure Power is evaluated, and makes cap bag under the pulling force of minimum 4448N, and position is not moved；End pulling-out force at various pressures is carried out Record, chooses most suitable pressure, as the pressure process parameter in upsetting pressure operation；(2) upsetting pressure: end cap is put into upsetting pressure mould In, with hydraulic press, position to the neighbouring end cap two ends on the middle position of end cap and anti-vibration bar carries out upsetting pressure respectively, and pressure is fixed Pressure off-load after 10 seconds is kept, it is ensured that after end cap upsetting pressure, meet drawing requirement after Wei.Upsetting pressure position in anti-vibration bar has everywhere, adjacent At proximal cap end each two, for carrying out spacing to end cap, end cap is prevented to be subjected to displacement in anti-vibration bar.

Described inspection: (1) flatness detects, and measures with clearance gauge in detection platform；(2) size detection, with digital display thousand points Product measured by chi；(3) angle detection, measures with digital display angle measuring instrument；(4) visual detection, the most visually examines workpiece Survey, it is ensured that surface zero defect, surface roughness roughness measuring instrument crawls measurement；(5) surface finish measurement, with thick Rugosity detector or control sample block measure；All size detection results should meet drawing requirement.

Described cleaning: bar is cleaned by relevant regulations, it is ensured that finished surface does not has rust staining, dust and other pollutions Thing, (1) sulfur, lead, hydrargyrum, cadmium and the metal of other low melting points, and their alloy and compound, halogen-containing material is all forbidden For anti-vibration bar preparation, test, check and the process such as packaging；(2) lubricant, cuttings liquid and abluent do not contain above-mentioned thing yet Matter；Molykote, politef and other poly-fluorine materials also prohibit the use of.

Embodiment 2

The preparation method of the anti-vibration bar bar in above-described embodiment 1, includes following operation: induction furnace is smelted, melting successively Analysis, forging, hot rolling, the first heat treatment, performance test (stretching, hardness) and metal lographic examination, product analysis, cold-drawn, the second heat Process, finished product processing, performance test (stretching, hardness) and grain size inspection, dimension control, labelling, cleaning.

Described induction furnace is smelted: places nickel plate, pure iron, crome metal when alloy material is smelted bottom induction furnace, and mixes Fill closely knit, after fusing 70%, add total charged material weight 2% slag charge make steel, record after molten steel temperature reaches tapping temperature Molten steel is fallen down in ladle, after calm 1-2 minute, pours into steel ingot bar.Every 40-50kg of steel ingot weight, steel ingot diameter microcephaly 140mm, major part 155mm.

Described heat analysis includes: (1) samples: car or dig chemical analysis sample beyond the head of ingot, ingot tail 20mm scope Product；(2) each heat (batch) number is taken a sample for chemical analysis and measures the chemical analysis of every stove steel, and carry out by content standard data Screening.Melting chemical analysis should meet following table and require:

Described forging: by analyze qualified after steel ingot at 1150-1220 DEG C, be forged into the steel billet of 50*50mm size；

(1) Forge Heating thermometer:

(2) forging: forging compression ratio is: 4-6；Forging size: 50*50mm；Square billet major part excision more than 100mm, microcephaly Excision more than 50mm；Forging stock surface processes: forging stock surface strips off the skin reconditioning, removes the surface defects such as surface wrinkles crackle pipe.

Described hot rolling: carry out hot rolling at a temperature of steel billet is placed in 1050-1100 DEG C, is rolled into the bar of φ 16mm, heat After rolling cooling will by the crackle of root inspection surface quality, fold, scab, be mingled with, and thoroughly polishing is clean；

(1) billet heating temperature table is as follows:

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

The first described heat treatment: the bar after hot rolling is carried out vacuum annealing process, temperature is maintained at 800 ± 10 DEG C；

Described performance test includes: (1) batch number each to the hot rolled rod after heat treatment times takes one group of sample；(2) Sample is carried out respectively tension test, hardness test, Metallographic Analysis and product analysis, substandard product is got rid of；

1. stretch test result should meet following table require:

As bar≤25mm, the longitudinal axis of sample is consistent with the center of bar, and sample useful part distance bar The distance of heat treated end cannot be less than the diameter of bar.

2. hardness test should meet:

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

3. Metallographic Analysis should meet:

4. product analysis: material product analysis is done in sampling at the two ends of tensile sample, and analysis result should meet:

5. retrial and another warm process:

If the stretch test result of 5.1 bars is undesirable, two can be cut in the adjacent parts of failed test sample Additional sample carries out tension test, only can check and accept when two additional specimen test results are satisfied by requiring；

If 5.2 any a collection of bar heat treatments are improper and cause mechanical property defective, then can to this batch of material again Heat treatment, but the number of times that another warm processes is not to be exceeded twice；After another warm processes, this batch of material is carried out technical conditions regulation All inspections (except chemical analysis and the inspection of non-metallic inclusion)；All inspections all should meet the requirement of these technical conditions.

Described cold-drawn includes: (1) first carries out soft annealing process, is incubated 40 minutes at a temperature of 720-750 DEG C；(2) By deformation requirements glomerocryst mould successively drawing, and to carrying out reconditioning at crizzle, lower road after reconditioning to zero defect, can be carried out Drawing.

Draw during cold-drawn deflection be 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:

The second described heat treatment: finished-product material will be pulled to and be laid in bell-jar heat-treatment furnace, in hydrogen shield state Under carry out heat treatment, annealing holding temperature is 788-815 DEG C, heat treatment temperature and other require that according to the form below requirement is carried out:

Described finished product processing: the bar after heat treatment is aligned, the cold working operation such as polishing, the thickness after processing Degree, width, torsion resistance, linearity equidimension should meet following table and require:

Described performance test: bar is carried out mechanical property test, hardness test, grain size inspection, to being unsatisfactory for skill The bar that art condition requires is got rid of.

1. mechanical property test should meet:

2. hardness test should meet:

3. grain size inspection:

If the mechanical property of bar does not meets technology requirement, then can carry out multiple in this double sampling of sample adjacent parts Examination, retrial result all should meet the specification requirement.

Described dimension control includes: (1) visually inspects: to every material surface by Zhi Jinhang visual inspection, it is desirable to flawless, The defects such as scuffing, bar does not allow to carry out any repair by welding, and checks its surface roughness by Zhi Jinhang, needs suspicious district Increase and check, record result and answer Ra≤1.6 μm；(2) dimensional gaughing: the material taking out 5% carries out dimensional gaughing, it is ensured that scantling Meet the tolerance of 4.028 ± 0.013* (12.19).

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

Described cleaning: bar is cleaned by relevant regulations, it is ensured that finished product Surface of Rod Bar do not have rust staining, dust and its His pollutant；Rod iron can not contact the material having harm to itself and integrity.The incompatibility material of main metal have lead, Zinc, copper, aluminum, cadmium, stannum, hydrargyrum, sulfur, arsenic, boron and general low-melting alloy and their compound thereof, in addition, owing to containing The degraded of chlorine plastics and the fluoride, sulfate, chloride and the acid chloride that produce are a potential danger, should select cautiously Select adhesive tape, marking pen, couplant, penetrating agent and coating；If it is desired that with milling tools, first have to guarantee milling tools not by Pollute.

Embodiment 3

The preparation method of the end cap in above-described embodiment 1, includes following operation successively: induction furnace smelting, electroslag refining, molten Refining analysis, forging, ultrasound investigation, hot rolling, heat treatment, performance test, product analysis, end cap Vehicle Processing, dimension control, mark Note, cleaning.

Described induction furnace is smelted: places nickel plate, pure iron, crome metal when alloy material is smelted bottom induction furnace, and mixes Filling closely knit, after fusing 70%, the slag charge adding always feed intake 2% is made steel, and records molten steel temperature and reaches after tapping temperature steel Water falls down in ladle, pours into steel ingot bar, every 40-50kg of steel ingot weight, steel ingot diameter microcephaly after calm 1-2 minute 140mm, major part 155mm.

Described electroslag refining: alloy material, after smelting, just will can be effectively improved steel alloy through electroslag refining Degree of purity, structural homogenity, improve the surface of steel ingot, inherent quality, improve the performance of steel alloy.When electroslag refining is complete, Carry out feeding, after feeding 3-5 minute, cool down >=3 minutes de-ingots.Then the process of ESR ingot surface is carried out: surface strips off the skin, reconditioning.

Described heat analysis includes: (1) samples: car or dig chemical analysis sample beyond the head of ingot, ingot tail 20mm scope Product；(2) each heat (batch) number is taken a sample for chemical analysis, by " ASTM E38 nickel-chrome and nickel-chromium-ferro alloy chemical analysis side Method " test method that requires carries out Chemical bath deposition, and screens by content standard data material, and melting chemistry should accord with Close:

Described forging: by analyze qualified after steel ingot at a temperature of 1240-1260 DEG C, be forged into the steel of 50*50mm size Base.

1. to make annealing treatment steel ingot before forging, heat treatment temperature according to the form below is carried out:

2. deformation technique: forging compression ratio is: 4-6；Square billet major part excision more than 100mm, microcephaly excises more than 50mm；Forging Make square billet a size of 50*50mm；Forging stock surface processes: forging stock surface strips off the skin reconditioning, removes the surfaces such as surface wrinkles crackle pipe Defect.

Described ultrasound investigation: by the square rod of the reconditioning that strips off the skin by the detection of regulation in " bar Dynamic Non-Destruction Measurement condition " Method and acceptance criteria carry out ultrasound examination.

Described hot rolling: carry out hot rolling at a temperature of square billet is placed in about 1200 DEG C, be rolled into the material of φ 13*25mm, Hot-rolled temperature deviation is less than 10 degree, after hot rolling cooling will by the crackle of root inspection surface quality, fold, scab, be mingled with etc. scarce Fall into, and thoroughly polishing is clean；

1. the square billet after forging first makes annealing treatment before hot rolling, annealing temperature such as following table:

2. roll control: end cap material is rolled into φ 13*25mm；Will be by root check table facial cleft after milling material cooling Stricture of vagina, fold, scab, the defect such as be mingled with, and excise or thoroughly polishing clean；Rolling ratio is for >=5.

Described heat treatment includes: 1. solution treatment: the end cap material φ 13*25mm material after hot rolling is laid in bell jar Solution treatment in formula hydrogen shield stove, heat treatment temperature such as following table:

Wherein, holding temperature deviation is less than ± 10 DEG C.

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

Steel grade	Specification	Heating-up temperature DEG C	Temperature retention time (h)	The type of cooling
					SB-166 UNS N06690	φ13*25mm	704～732 DEG C	8-12h	Air cooling

Wherein, Ageing Treatment is not to be exceeded ± 10 DEG C at the temperature deviation of soak.

3. solid solution and aging strengthening model 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.

Described performance test includes:

1. sampling: each batch number times takes a sample and does mechanical property test, and the longitudinal axis of tensile sample is parallel to bar Axially.The useful part of tensile sample is at least one times of diameter of rod from bar end；The longitudinal axis location of tensile sample For bar center；Sample has enough length, in order to intercept all tests consumption such as hardness specimens, metallographic specimen and can Sample needed for energy retrial.

2. tension test should meet:

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

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

4. macro-erosion test: appoint extraction one to carry out macroetch test for every batch, should be transversal at the two ends crop of bar Face position is tested, and with the naked eye or by less than 10 times magnifieres evaluates, is not allow for shrinkage cavity, cavity, crackle, slag inclusion And the defect such as pin hole.

5. Huey test: every batch of bar should take one group of (two) sample on any one bar after Ageing Treatment Carrying out Huey test, sample takes in stretching adjacent locations, and sample should be first through sensitized treatment, and sensitized treatment system is 675 DEG C ± 5 DEG C be incubated 1 hour, sample corrosion rate should be less than 20mdd (milligram/square decimeter. sky).

6. product analysis: each stove is appointed and taken a sample and do the product analysis of material near tensile sample, and product divides Analysis result should meet:

Described end cap Vehicle Processing: the φ 13*25mm material after Ageing Treatment is made a service test, and to qualified material Material machines, and is processed into φ 22.86 ± 0.05, the end cap product of long 50.8 ± 0.07 on request.

Described dimensional gaughing: 1, to every material surface by Zhi Jinhang visual inspection, end cap is not allow for indentation, burr, indulges Split, metal is heaved.2, material carrying out dimensional gaughing, the inspection quantity of every stove material should be greater than 5%.

Described labelling: should accurately make mark on every material or tie on a label, should include: job number, material board Number and specification, bar piece number, hearth number, heat treatment heat (batch) number, bar maker's name.

Described cleaning: bar is cleaned by relevant regulations, it is ensured that finished product end cap surface do not have rust staining, dust and Other pollutant.

Claims (1)

1. the preparation method of an AP1000 Shockproof strip assembly for steam generator of nuclear power unit, it is characterised in that: this anti-vibration bar Assembly includes: the anti-vibration bar of V-shape structure and respectively fixed cover are located at the end cap at anti-vibration bar two ends；Described anti-vibration bar selects 405 Stainless steel material；Described end cap selects 690 nickel-bass alloy materials；

The preparation method of described anti-vibration bar assembly, in turn includes the following steps:

A, anti-vibration bar bar is bent the operation of molding: anti-vibration bar bar size overall length on request is added 50mm allowance and cuts Disconnected, set angle bends anti-vibration bar, and the anti-vibration bar after bending is placed on surface grinding machine, and bent angle buildup area is carried out reconditioning；

The operation of B, end cap assembling: end cap ethanol is dabbed and washes end cap surface and line cutting endoporus, simultaneously with ethanol by stainless Steel Bar is carried out, after cleaning up, and deburring, bite mark, protrusion metal or wedge angle；Again the end of stainless steel bars is inserted Enter in the endoporus of end cap；

C, the operation of upsetting pressure: end cap is put in upsetting pressure mould, with hydraulic press respectively on the middle position of end cap and anti-vibration bar Four points at neighbouring end cap two ends carry out upsetting pressure, namely to carrying out upsetting pressure at neighbouring end cap end each two, pressure is protected behind location Hold pressure off-load after 10 seconds；

The preparation method of described anti-vibration bar bar in turn includes the following steps:

A, induction furnace are smelted: place nickel plate, pure iron, crome metal when alloy material is smelted bottom induction furnace, and load in mixture closely knit, molten Change after 70%, add total charged material weight 2% slag charge make steel, record after molten steel temperature reaches tapping temperature and molten steel poured into In ladle, after calm 1-2 minute, pour into steel ingot bar；

B, forging: forging compression ratio is: 4-6；Alloy material steel ingot after being smelted by induction furnace is 1150-1220 DEG C of heating And after insulation, be forged into the steel billet of 50*50mm size, and carry out surface finish reconditioning；

C, hot rolling: heat at a temperature of above-mentioned steel billet is placed in 1050-1100 DEG C, be incubated after carry out hot rolling, be rolled into φ 16mm's Bar；

D, the first heat treatment: after again the bar after hot rolling is carried out surface finish, reconditioning, carry out vacuum annealing process, by upper State bar to carry out heating, being incubated at temperature 800 DEG C ± 10 DEG C；

E, cold-drawn: first carry out soft annealing process, be incubated 40 minutes at a temperature of 720-750 DEG C；By deformation requirements glomerocryst mould Drawing successively, and to carrying out reconditioning at crizzle, the drawing of lower road after reconditioning to zero defect, can be carried out；

F, the second heat treatment: the bar of above-mentioned cold drawn forming is laid in bell-jar heat-treatment furnace, under hydrogen shield state Carrying out heat treatment, during annealing insulation, temperature is 788-815 DEG C, is incubated more than 3 hours；Then with cold less than 28 DEG C/h But speed slow cooling is to less than 610 DEG C, then air cooling is to room temperature；

G, finished product are processed: the bar after processing is aligned, polished.