Method for manufacturing shake-proof strip of steam generator of nuclear power unit

A technology for steam generators and nuclear power units, which is applied to the primary side of steam generators, etc., can solve the problems of increasing the danger of radioactive irradiation of maintenance personnel, waste of manpower, financial resources and incidents, so as to improve the performance of processing technology and realize automation. , the effect of reducing costs

Active Publication Date: 2014-03-26

丹阳市龙鑫合金有限公司

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AI-Extracted Technical Summary

Problems solved by technology

Once the heat transfer tube is damaged by vibration, the steam generator has to be replaced, which will inevitably cause a huge w...

Abstract

Provided is a method for manufacturing a shake-proof strip of a CAP 1400 unit steam generator. The shake-proof strip comprises a shake-proof strip of a V-shaped structure and two end caps arranged at two ends of the shake-proof strip. The shake-proof strip is made of a 405 stainless steel material, and the end caps are made of a 690 nickel base alloy material. The method for manufacturing a shake-proof strip assembly includes procedures of manufacturing of the shake-proof strip, manufacturing of the end caps, bending forming, end cap assembling, rammer pressing, checking, cleaning and packaging. The shake-proof strip assembly is simple in structure, product quality meets precise requirements of the steam generator in a nuclear power station on the shake-proof strip, and use is safe. The manufacturing method of the shake-proof strip is subjected to strict manufacturing procedures, meets process requirements for the shake-proof strip assembly of the steam generator in the nuclear power station, guarantees quality and improves the safety performance.

Application Domain

Steam generator primary side

Technology Topic

Process engineeringNuclear power plant +6

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Examples

Experimental program(3)

Example Embodiment

[0061] Example 1

[0062] Such as figure 1 The anti-vibration strip assembly of the steam generator of the CAP1400 unit of this embodiment includes: a V-shaped structure anti-vibration strip 1 and two end caps 2 fixedly sleeved on both ends of the anti-vibration strip; the cross-section of the anti-vibration strip It is rectangular, and the cross section of the end cap is in the shape of a round shape to facilitate the anti-vibration strip and the end cap to be fixed by upsetting.

[0063] The anti-vibration strip 1 is made of 405 stainless steel material (SA-479 TYPE405); the end cap 2 is made of 690 nickel-based alloy material (SB-166 UNS N06690).

[0064] The center of the end cap 2 and the four places on the anti-vibration strip 1 adjacent to the two ends of the end cap are crushed. The two flattened locations at the end of the end cap on the anti-vibration strip 1 are symmetrically distributed.

[0065] The preparation method of the anti-vibration strip assembly includes: preparation of anti-vibration strips, preparation of end caps, bending and molding of anti-vibration strips, end cap assembly, upsetting, inspection, cleaning and packaging.

[0066] The said anti-vibration bar is bent into shape: the anti-vibration bar is cut according to the required size and total length plus 50mm allowance, the angle is set to bend the anti-vibration bar, and the bent anti-vibration bar is placed on a surface grinder Above, the thickened area of the bend angle is trimmed to the drawing requirements.

[0067] The end cap assembly: the end cap is gently scrubbed with alcohol on the surface of the end cap and the inner hole formed by wire cutting, and the stainless steel bar is cleaned with alcohol at the same time. After cleaning, remove burrs, bite marks, protruding metal or sharp corners ; Then insert the stainless steel rod into the end of the cap and align the angle for assembly.

[0068] The upsetting includes: (1) Pull-off force process evaluation: The pull-off force evaluation is performed on the end cap after the assembly is completed and upset, so that the cap does not move under the minimum pull force of 4448N; under different pressures Make a record of the pull-off force of the end part, and select the most suitable pressure as the pressure process parameter in the upsetting process; (2) Upsetting: Put the cap end into the upsetting mold, and use a hydraulic press to adjust the center positions of the end caps. And the positions adjacent to both ends of the end cap on the anti-vibration strip are upset. After pressing down and positioning, keep the pressure for 10 seconds and then unload to ensure that the cap end meets the requirements of the drawing after upsetting. There are four upsetting positions on the anti-vibration strip, two adjacent to the end of the end cap, which are used to limit the end of the cap and prevent the end cap from shifting on the anti-vibration strip.

[0069] The inspection: (1) flatness detection, measured with a feeler gauge on the detection platform; (2) size detection, measured with a digital micrometer; (3) angle detection, measured with a digital angle measuring instrument; (4) Visual inspection, visual inspection of the workpiece piece by piece to ensure that the surface is free of defects, the surface roughness is measured with a roughness measuring instrument for crawling measurement; (5) Surface roughness measurement is measured with a roughness detector or a comparison sample; All dimensional inspection results should meet the requirements of the drawings.

[0070] The cleaning: clean the bar in accordance with relevant regulations to ensure that the surface of the finished product is free of rust spots, dust and other pollutants, (1) sulfur, lead, mercury, cadmium and other low-melting metals, as well as their alloys and compounds, including Halogen substances are forbidden to be used in the preparation, testing, inspection and packaging of anti-vibration strips; (2) Lubricants, cutting liquids and cleaning agents do not contain the above substances; molybdenum disulfide lubricants, polytetrachloroethylene and others Polyfluoro materials are also prohibited.

Example Embodiment

[0071] Example 2

[0072] The preparation method of the anti-vibration bar in the above embodiment 1 includes the following steps in sequence: induction furnace smelting, melting analysis, forging, hot rolling, first heat treatment, performance test (tensile, hardness) and metallographic inspection, product Analysis, cold drawing, second heat treatment, finished product processing, performance test (tensile, hardness) and grain size inspection, size inspection, marking, cleaning.

[0073] Said induction furnace smelting: when alloy materials are smelted, nickel plates, pure iron, and metallic chromium are placed at the bottom of the induction furnace and mixed and compacted. After 70% melting, 2% of the total feed weight is added for steelmaking. When the temperature of the molten steel reaches the tapping temperature, the molten steel is poured into the ladle, calmed for 1-2 minutes, and then poured into ingots and bars. The weight of each ingot is 40-50kg, and the diameter of the ingot is 140mm small and 155mm large.

[0074] The smelting analysis includes: (1) Sampling: taking a chemical analysis sample by car or planing out of the range of 20mm from the ingot head and tail; (2) Taking a chemical analysis sample for each furnace number to determine the chemical composition of each furnace steel, And filter according to content standard data. The smelting chemical composition should meet the requirements of the following table:

[0075] Grade 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 margin 0.10-0.30

[0076] Said forging: forging the steel ingots that have passed the analysis at 1150-1220°C into a steel billet with a size of 50*50mm;

[0077] (1) Forging heating temperature table:

[0078]

[0079] (2) Forging: forging compression ratio: 4-6; forging size: 50*50mm; billet big end is cut more than 100mm, small end cut more than 50mm; forging billet surface treatment: forging billet surface peeling and grinding, removing surface wrinkles and cracks Surface defects such as heavy leather.

[0080] Said hot rolling: the steel billet is hot rolled at a temperature of 1050-1100°C and rolled into a ф16mm bar. After the hot rolling is cooled, the surface quality of the cracks, folds, scars, and inclusions must be inspected one by one, and thoroughly Polished clean

[0081] (1) The billet heating temperature table is as follows:

[0082]

[0083] (2) Rolling: The adjuster should straighten the appearance of the rolled product and roll it into a ф16mm wire; after the rolled product is cooled, the surface quality of the cracks, folds, scars, inclusions should be checked one by one, and the surface quality should be thoroughly polished. ; Rolling ratio: ≥5.

[0084] The first heat treatment: vacuum annealing the hot-rolled bar, keeping the temperature at 800±10°C;

[0085]

[0086] The performance test includes: (1) Take any set of samples for each batch of hot-rolled bars after heat treatment; (2) Perform tensile test, hardness test, metallographic analysis and product analysis on the samples respectively, Exclude substandard products;

[0087] performance Room temperature 350℃ Specified strength Rp0.2 (Mpa) ≥170 ≥145 Tensile strength Rm(Mpa) ≥415 ≥370 Elongation after breaking A (%) ≥20 info Reduction of area Z (%) ≥45 info

[0088] When the bar is ≤25mm, the longitudinal axis of the sample is consistent with the center of the bar, and the distance between the useful part of the sample and the heat-treated end of the bar shall not be less than the diameter of the bar.

[0089] performance Room temperature Hardness (HB) ≤207

[0090] The hardness test shall check the hardness of the bar at the middle of the distance from the center of the bar to the surface.

[0091] 3. Metallographic analysis should meet:

[0092]

[0093] 4. Product analysis: take samples at both ends of the tensile sample for material product analysis. The analysis results should meet:

[0094]

[0095] 5. Retest and re-heat treatment:

[0096] 5.1 If the tensile test results of the bar do not meet the requirements, two additional specimens can be cut from the adjacent part of the unqualified specimen for tensile test, and acceptance can only be accepted when the test results of the two additional specimens meet the requirements;

[0097] 5.2 If any batch of bars is improperly heat-treated and the mechanical properties are unqualified, the batch of materials can be re-heated, but the number of re-heat treatments should not exceed twice; after re-heat treatment, all the batches of materials specified in the technical conditions Inspection (except the inspection of chemical composition and non-metallic inclusions); all inspections shall meet the requirements of this technical specification.

[0098] The cold drawing includes: (1) first softening annealing treatment, holding at a temperature of 720-750°C for 40 minutes; (2) drawing with a polycrystalline die according to the deformation requirements, and grinding the surface micro-cracks , After grinding to no defects, the next drawing can be carried out.

[0099] The drawing deformation during cold drawing is φ16→φ14→φ12.5→φ11→4.8×12.8→4.4×12.5→4.028×12.19.

[0100] Steel type specification Heating temperature℃ Holding time (minutes) cooling method SA-479 TYPE405 Before each cold drawing 720-750℃ ≥40 Air cooling

[0101] The second heat treatment: spread the finished material flat in a bell-jar type heat treatment furnace, and conduct heat treatment under hydrogen protection. The annealing temperature is 788-815°C. The heat treatment temperature and other requirements are as follows:

[0102]

[0103] Said finished product processing: cold working procedures such as straightening and polishing the heat-treated bar, the thickness, width, twist, straightness and other dimensions after processing should meet the requirements of the following table:

[0104]

[0105] Said performance test: mechanical performance test, hardness test, and grain size inspection are performed on the bars, and the bars that do not meet the requirements of the technical conditions are excluded.

[0106] performance Room temperature Specified strength Rp0.2 (Mpa) 240-550 Tensile strength Rm(Mpa) 415-585 Elongation after breaking A (%) ≥15

[0107] performance Room temperature hardness HB≤207 or HRB≤93

[0108] Testing method Level requirements ASTM E112 Level 5 or finer

[0109] If the mechanical properties of the bar do not meet the technical requirements, double sampling can be carried out in the vicinity of the sample for retest, and the retest results should meet the technical requirements.

[0110] The dimensional inspection includes: (1) Visual inspection: visually inspect the surface of each material to be free of defects such as cracks and scratches. The bars are not allowed to undergo any welding repairs, and their surface roughness is gradually increased. In addition, the suspicious area needs to be inspected, and the measured result should be Ra≤1.6μm; (2) Dimensional inspection: 5% of the material is selected for dimensional inspection to ensure that the material size meets the tolerance requirements of 4.028±0.013*(12.19).

[0111] Said mark: each material should be accurately marked or attached with a label, indicating the name of the manufacturer, material brand and specification; melting furnace number, batch number and part number; contract number or order number.

[0112] Described cleaning: clean the bars according to relevant regulations to ensure that the surface of the finished bars is free of rust spots, dust and other contaminants; the steel bars cannot touch materials that are harmful to their integrity and integrity. The main metal incompatible materials include lead, zinc, copper, aluminum, cadmium, tin, mercury, sulfur, arsenic, boron and general low melting point alloys and their compounds. In addition, due to the The fluoride, sulfate, chloride and acid chloride produced by degradation are a potential hazard. Tapes, markers, coupling agents, penetrants and coatings should be carefully selected; if you want to use sanding tools, first make sure to sand the tools Not contaminated.

Example Embodiment

[0113] Example 3

[0114] The preparation method of the end cap in the above embodiment 1 includes the following steps in sequence: induction furnace smelting, electroslag refining, smelting analysis, forging, ultrasonic inspection, hot rolling, heat treatment, performance test, product analysis, end cap turning processing, size Inspection, marking, cleaning.

[0115] Said induction furnace smelting: when alloy materials are smelted, nickel plates, pure iron, and metallic chromium are placed at the bottom of the induction furnace, and mixed and compacted. After 70% melting, 2% of the total feed is added for steelmaking. After the temperature of the molten steel reaches the tapping temperature, the molten steel is poured into the ladle, calmed for 1-2 minutes, and then poured into a steel ingot bar. The weight of each ingot is 40-50kg, and the diameter of the ingot is 140mm small and 155mm large.

[0116] Said electroslag refining: after the alloy material is smelted, it must undergo electroslag refining to effectively improve the purity and uniformity of the structure of the alloy steel, improve the surface and internal quality of the steel ingot, and improve the performance of the alloy steel. After the electroslag refining is completed, feed it, feed it for 3-5 minutes, cool it for ≥3 minutes and take it off. Then the surface treatment of the electroslag ingot: peeling and grinding on the surface.

[0117] The smelting analysis includes: (1) Sampling: taking chemical analysis samples by car or planing out of the range of 20mm from the ingot head and tail; (2) Taking a chemical analysis sample for each furnace number, according to "ASTM E38 Nickel-Cr The chemical composition of the material is analyzed according to the test methods required by the "Methods of Chemical Analysis of Nickel-Chromium-Iron Alloys", and screening is carried out according to the content standard data. The smelting chemistry should meet:

[0118] element Ingredient limit% element Ingredient limit% element Ingredient limit% element Ingredient 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

[0119] Said forging: forging the steel ingots that have passed the analysis at a temperature of 1240-1260°C into a steel billet with a size of 50*50mm.

[0120] 1. The steel ingot should be annealed before forging, and the heat treatment temperature should be carried out as follows:

[0121]

[0122] 2. Deformation process: forging compression ratio: 4-6; billet large end is cut more than 100mm, small end cut more than 50mm; forging billet size is 50*50mm; forging billet surface treatment: forging billet surface peeling and grinding, removing the surface Surface defects such as wrinkles and cracks.

[0123] The described ultrasonic inspection: the square bars that are peeled and ground are subjected to ultrasonic inspection according to the inspection methods and acceptance criteria specified in the "Technical Conditions for Nondestructive Inspection of Bars".

[0124] The hot rolling: hot rolling the billet at a temperature of about 1200°C, rolling it into a material of 13*25mm, the temperature deviation of hot rolling does not exceed 10 degrees, and checking the surface quality of cracks one by one after the hot rolling is cooled , Folds, scars, inclusions and other defects, and thoroughly polished;

[0125] 1. The forged billet is annealed before hot rolling. The annealing temperature is as follows:

[0126]

[0127] 2. Rolling control: the end cap material is rolled to 13*25mm; after the rolled product is cooled, the surface cracks, folds, scars, inclusions and other defects should be inspected one by one, and then removed or thoroughly polished; the rolling ratio is ≥5.

[0128] The heat treatment includes: 1. Solution treatment: spread the hot-rolled end cap material 13*25mm in a bell-type hydrogen protection furnace for solution treatment, and the heat treatment temperature is as follows:

[0129] Steel type specification Heating temperature℃ Holding time (h) cooling method SB-166 UNS N06690 13*25mm The specific heat treatment temperature is as follows ≥1 Air cooling

[0130] Carbon 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

[0131] Among them, the temperature deviation of the holding temperature shall not exceed ±10℃.

[0132] 2. Aging treatment: The bars after solution treatment must be aging treatment, and the aging treatment should also be carried out in a hydrogen protection furnace. The heat treatment temperature is:

[0133] Steel type specification Heating temperature℃ Holding time (h) cooling method SB-166 UNS N06690 13*25mm 704~732℃ 8-12h Air cooling

[0134] Among them, the temperature deviation of the aging treatment during the holding period should not exceed ±10°C.

[0135] 3. Solid solution and aging heat treatment records should be included in the quality certification documents. The heat treatment records should include the holding temperature and its deviation, holding time, heating rate, heating atmosphere and cooling method.

[0136] The performance test includes:

[0137] 1. Sampling: Take any sample from each batch number for mechanical performance test. The longitudinal axis of the tensile sample is parallel to the axial direction of the bar. The useful part of the tensile specimen is separated from the bar end by at least one time the diameter of the bar; the longitudinal axis of the tensile specimen is located at the center of the bar; the specimen has sufficient length to intercept the hardness specimen, All test amounts such as metallographic samples and the samples required for possible retests.

[0138] 2. The tensile test should meet:

[0139]

[0140] Among them, the tensile test uses a standard specimen with a gauge length of 50 mm and a diameter of 12.5 mm.

[0141] 3. Metallographic analysis: Take samples from the vicinity of the tensile test sample for metallographic analysis. The metallographic analysis testing standards are:

[0142]

[0143] 4. Macro erosion test: Any one from each batch is selected for macro erosion test. The test should be carried out on the cross-section of the cut head at both ends of the bar. The evaluation should be carried out with the naked eye or with the help of a magnifying glass below 10 times. Defects such as voids, cracks, slag inclusions and pinholes.

[0144] 5. Intergranular corrosion test: A set of (two) samples should be taken from any bar after aging treatment for intergranular corrosion test. The sensitization treatment system is 675℃±5℃ for 1 hour, and the corrosion rate of the sample should be less than 20mdd (mg/square decimetre.day).

[0145] 6. Product analysis: Take any sample from each furnace near the tensile sample for product analysis of the material. The product analysis result should meet:

[0146] element Ingredient limit% element Ingredient limit% element Ingredient limit% element Ingredient 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

[0147] Said end cap turning processing: performing performance test on 13*25mm material after aging treatment, turning processing on qualified materials, and processing into end cap products with φ22.86±0.05 and length 50.8±0.07 as required.

[0148] The described size inspection: 1. Visually inspect the surface of each material, and the end caps are not allowed to have nicks, burrs, longitudinal cracks, or metal bulging. 2. Carry out dimensional inspection on the material, the inspection quantity of each furnace material should be greater than 5%.

[0149] Said mark: each material should be accurately marked or attached with a label, which should include: order number, material brand and specification, bar part number, melting furnace number, heat treatment furnace number, and bar manufacturer name.

[0150] Described cleaning: Clean the bar according to relevant regulations to ensure that the surface of the finished end cap is free of rust, dust and other contaminants.

PUM

Property	Measurement	Unit
Tensile strength	>= 415.0	mPa
Hardness	<= 207.0	hb
Diameter	40.0 ~ 155.0	mm

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Method for manufacturing shake-proof strip of steam generator of nuclear power unit

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