CN111850403A - Stainless steel cladding tube for lead alloy liquid metal cooling fast reactor and manufacturing method - Google Patents

Stainless steel cladding tube for lead alloy liquid metal cooling fast reactor and manufacturing method Download PDF

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CN111850403A
CN111850403A CN202010655196.3A CN202010655196A CN111850403A CN 111850403 A CN111850403 A CN 111850403A CN 202010655196 A CN202010655196 A CN 202010655196A CN 111850403 A CN111850403 A CN 111850403A
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equal
less
cold rolling
stainless steel
cladding tube
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CN111850403B (en
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高佩
蒋吉超
王�锋
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JIANGSU YINHUAN PRECISION STEEL PIPE CO Ltd
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JIANGSU YINHUAN PRECISION STEEL PIPE CO Ltd
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    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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Abstract

The invention discloses a stainless steel cladding tube for a lead alloy liquid metal cooling fast reactor, which comprises the following components in percentage by weight: c: 0.04-0.07%, Si: 0.40-0.60%, Mn: 1.40-1.90%, P is less than or equal to 0.010%, S is less than or equal to 0.010%, Cr: 14.50-16.50%, Ni: 14.5-15.5%, Mo: 1.50-2.50%, Ti: 0.30-0.60%, N: 0.004-0.012%, Cu is less than or equal to 0.03%, Al is less than or equal to 0.05%, B: 0.002-0.005%, V: 0.15-0.21%, Co is less than or equal to 0.03%, Nb + Ta is less than or equal to 0.3%, W is less than or equal to 0.03%, Ca is less than or equal to 0.005%, Zr is less than or equal to 0.03%, H is less than or equal to 0.0005%, O is less than or equal to 0.0025%, As is less than or equal to 0.005%, Ti/C = 5-7, and the balance of Fe and other trace elements, wherein the sum of the components is 100%; the invention provides a stainless steel cladding tube for a lead alloy liquid metal cooling fast reactor fuel assembly and a manufacturing method thereof, wherein the stainless steel cladding tube has the advantages of low cost, good microstructure, good mechanical property, good size precision and good surface quality, and solves the manufacturing process problem of the stainless steel cladding tube so as to meet the use requirement of the fuel assembly.

Description

Stainless steel cladding tube for lead alloy liquid metal cooling fast reactor and manufacturing method
Technical Field
The invention relates to a stainless steel cladding tube for a lead alloy liquid metal cooling fast reactor and a manufacturing method thereof, which are used for a lead alloy liquid metal cooling fast reactor fuel assembly.
Background
Nuclear energy plays a very important role in the world energy structure as a clean energy source capable of replacing fossil fuels on a large scale. In 6 months 1999, the Department of Energy, science and technology office of the united states proposed a fourth generation nuclear power plant (hereinafter referred to as fourth generation nuclear power) for the first time. In 7 months 2001, the nine countries mentioned above established the fourth Generation International Forum for nuclear energy systems (GIF) and signed agreements. In the GIF meeting held in tokyo at 19-20 days in 2002, 10 participating countries agree to develop six fourth-generation nuclear power station conceptual reactor systems, namely a gas-cooled fast reactor system, a lead-based alloy liquid metal cooling fast reactor system, a molten salt reactor system, a liquid sodium-cooled fast reactor system, an ultra-high temperature gas-cooled reactor system and a supercritical water-cooled reactor system, on the basis of the 94 conceptual reactors.
In 2016, 9/18-21 days, the fifth international nuclear and renewable energy conference (NURER) sponsored by the institute of nuclear and technology security of Chinese academy of sciences was held in the united state. Wu YiCan, a Ministry of nuclear safety of the Chinese academy, indicates that the requirements of people on environmental health and clean energy are higher and higher at present when receiving the interview of a reporter of Chinese science newspaper, and as an important scheme and way for coping with future climate change and advanced nuclear energy, a lead-based reactor is evaluated as a ' fourth generation reactor expected to realize industrial demonstration and commercial application for the first time ' by the fourth generation nuclear energy system International Forum organization (GIF) ' and plays a positive role in the development of clean energy such as nuclear energy and the like. The lead-based fast reactor is a fast neutron reactor which takes molten metal lead or lead-bismuth alloy as a coolant, adopts closed fuel circulation and can operate under the conditions of normal pressure and high temperature. The lead-based fast reactor has excellent fuel conversion capacity, can effectively improve the utilization rate of uranium and thorium resources, greatly improves the sustainability of the fuel, and can be used for incinerating long-life actinides in the conventional light water reactor spent fuel, thereby utilizing nuclear energy more cleanly. In addition, its inert and low pressure coolant system further enhances the safety of the reactor. The lead-based fast reactor has the advantages of safety, economy and sustainability, and is one of the main development directions of advanced nuclear energy technology in the future.
Since the 50 s of the 20 th century, 8 nuclear submarines driven by lead-bismuth reactors were successfully built in the former soviet union, and a world record of 42-section navigational speed was created. After the 21 st century, russia actively promoted the commercial application of lead-based reactors, and lead-bismuth reactors SVBR-100 (electric power 100MW) and lead-cold fast neutron reactors BRST-OD-300 (electric power 300MW) were being designed and built, and were planned to be built for power generation in 2019 and 2021, respectively. The ATW program was formally initiated in 1999 in the united states and planned to utilize the lead bismuth cooled accelerator driven subcritical system (ADS) for nuclear waste transmutation. Since 2001, with the support of the fourth generation reactor research project of the department of energy, the united states developed stack-type concepts such as a small modular lead cold storage reactor SSTAR, a lead bismuth cooled transmutation reactor ENHS, and a lead bismuth natural circulation small modular reactor G4M. After 2000, the european union has developed complete lead-based reactor development routes and plans with continued support from the fifth, sixth, and seventh technological framework plans, with over 20 research institutes participating in the plans. In 2013, an engineering design contract of a lead-bismuth cooled accelerator driving subcritical reactor MYRRHA was signed in Belgium, meanwhile, the European Union establishes a financial group FALCON, and starts the work of designing and building a European lead-cooled demonstration reactor (ALFRED) in Romani. In addition, Japan and Korea have own lead-based reactor development plans and develop a great deal of lead-based reactor research and development work. In 2011, the Chinese academy of sciences formally started the strategic science and technology leader special item of 'future advanced nuclear fission energy-ADS transmutation system', and the FDS team of the national academy of sciences and safety technologies develops research and development work aiming at the lead-based reactor CLEAR comprehensively under the support of the item, and plans to realize commercial application through three stages of research experiment stack CLEAR-I, engineering demonstration stack CLEAR-II and commercial prototype stack CLEAR-III. Significant progress has been made in the design of lead-based reactors, the technology of lead-bismuth circuits and oxygen control, the research and development of key equipment, nuclear fuels and materials, safety analysis, experimental verification and the like. The ultimate use of lead-based reactors in commercial nuclear power plants has required extensive research.
The fuel assembly is an indispensable important component in the reactor, while the cladding tube and the outer sleeve are important barriers of the core, which can ensure the integrity of the fuel assembly, prevent fission products from escaping, and isolate the coolant from the nuclear fuel, so that the selection of the structural material needs to consider the relation between the required characteristics and the chemical composition of the material and the smelting conditions. The main criteria are as follows:
(1) the high-temperature strength, especially creep rupture property, is good, so that the coolant has higher outlet temperature;
(2) the radiation resistance is good, especially the anti-swelling performance, so that the natural gas can reach higher burnup;
(3) good compatibility with fuel and coolant;
(4) the weldability is good;
(5) the manufacturing cost is low.
For various reasons, austenitic stainless steel is selected as a core structural material in various countries, the early core structural material is 304 and 316, and the later core structural material is 316Ti, so that in order to further improve the anti-swelling capacity, a new generation of advanced austenitic stainless steel, such as 15-15Ti, is developed, has good high-temperature strength, corrosion resistance, irradiation performance and anti-swelling performance, is a main candidate material for a lead-based reactor cladding tube and an outer sleeve, and is finally delivered with a certain cold working degree (generally 15-20%). The patent (patent No. CN 101333631A) applied by the Chinese atomic energy science research institute describes a preparation method of a TP316Ti stainless steel cladding tube, namely the stainless steel cladding tube is prepared by adopting the modes of vacuum induction (or argon-oxygen furnace) smelting, vacuum consumable (electroslag remelting) smelting, hot working, cold drawing or cold rolling, and the application object is the cold fast-reactor cladding tube. The patent (patent No. CN 108160743A) applied by Ji Jiang Jiulite materials science and technology Limited company describes a preparation method of a TP304 austenitic stainless steel cladding tube, namely the preparation method adopts the modes of vacuum induction melting, vacuum consumable smelting, hot extrusion, cold drawing or cold rolling. Patents (application numbers: 201110143627.9 and 201410227245.8) of China Nuclear Power research institute all describe novel plates for austenitic stainless steel shells for supercritical water-cooled reactors, and are formed by adding trace alloy elements into traditional austenitic stainless steel. A patent (application number: 201510563708.2) applied by the institute of science and technology of combined fertilizer and material science of Chinese academy of sciences describes a preparation method of an austenitic stainless steel cladding tube, which is formed by adopting the processes of vacuum induction, vacuum consumable smelting, forging, hot extrusion, cold rolling and cold drawing, and the adopted cladding tube material refers to 15-15Ti stainless steel components, but the scope of the 15-15Ti components is not unified at home and abroad at present. Therefore, the development of an austenitic stainless steel cladding tube which has good high-temperature structure, mechanical stability, corrosion resistance, high dimensional precision and surface quality and can meet the requirements of a fourth-generation lead alloy liquid metal cooling fast reactor fuel assembly and a preparation process thereof are urgently needed.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art, provide a stainless steel cladding tube for a lead alloy liquid metal cooling fast reactor fuel assembly and a manufacturing method thereof, wherein the stainless steel cladding tube has the advantages of low cost, good microstructure, good mechanical property, good dimensional precision and good surface quality, and solve the manufacturing process problem of the stainless steel cladding tube so as to meet the use requirement of the fuel assembly.
In order to solve the technical problems, the invention provides a stainless steel cladding tube for a lead alloy liquid metal cooling fast reactor, which comprises the following components in percentage by weight: c: 0.04-0.07%, Si: 0.40-0.60%, Mn: 1.40-1.90%, P is less than or equal to 0.010%, S is less than or equal to 0.010%, Cr: 14.50-16.50%, Ni: 14.5-15.5%, Mo: 1.50-2.50%, Ti: 0.30-0.60%, N: 0.004-0.012%, Cu is less than or equal to 0.03%, Al is less than or equal to 0.05%, B: 0.002-0.005%, V: 0.15-0.21%, Co is less than or equal to 0.03%, Nb + Ta is less than or equal to 0.3%, W is less than or equal to 0.03%, Ca is less than or equal to 0.005%, Zr is less than or equal to 0.03%, H is less than or equal to 0.0005%, O is less than or equal to 0.0025%, As is less than or equal to 0.005%, Ti/C = 5-7, and the balance of Fe and other trace elements, wherein the sum of the components is 100%.
The invention also designs a manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor, which comprises the following steps:
(one) smelting
The cladding tube material is smelted by adopting a double vacuum process, namely vacuum induction and vacuum self-consumption, and is smelted and cast into a steel ingot with phi 430mm by adopting vacuum induction, and then the steel ingot with phi 508mm is subjected to vacuum self-consumption;
(II) forging
Peeling the surface of the steel ingot obtained in the step (I), and forging the steel ingot on a 2000-ton quick forging machine in a multi-fire mode to obtain a round pipe blank, wherein the total elongation coefficient of forging is not less than 3, the specification after forging is phi 80mm, the head part resection rate is more than 4%, and the tail part resection rate is more than 6%;
(III) thermal piercing
Peeling the round tube blank obtained in the step (II) to the peeling depth of 1.5-2.0 mm, cutting the round tube blank to a fixed length on a band sawing machine, drilling a centering hole at one end of the round tube blank, and performing hot piercing on an inclined rolling piercing unit to obtain a pierced billet, wherein the specification of the pierced billet after the hot piercing is phi 80 x 7.5 mm;
(IV) acid washing
Straightening the hot punched pierced billet obtained in the step (three), cutting off defects at the head and the tail and removing burrs, then carrying out acid cleaning at 60 +/-5 ℃ by adopting a mixed solution of 5-8% hydrofluoric acid and 10-15% nitric acid, inclining the hot punched pierced billet when the hot punched pierced billet enters a cylinder and is taken out of the cylinder, wherein the acid cleaning time is 30-60 min, lifting the hot punched billet once every 10min, and washing the inner wall of the steel pipe by using high-pressure water;
(V) surface inspection and grinding
Inspecting and polishing the inner and outer surfaces of the stainless steel pipe obtained in the step (IV), and then performing inner and outer through polishing;
(VI) Cold Rolling and Heat treatment
Carrying out cold rolling on the stainless steel pipe obtained in the step (five) by adopting an LG60 rolling mill for 2 passes, deoiling after each cold rolling, carrying out solution heat treatment in a continuous roller hearth furnace, and then carrying out straightening, acid pickling, inner and outer surface inspection, coping and inner and outer polishing;
carrying out cold rolling for 1 pass by adopting an LG30 rolling mill, then deoiling, carrying out solution heat treatment in a pure hydrogen protection bright heat treatment furnace, and then carrying out straightening, inner and outer surface inspection, coping and inner and outer polishing;
carrying out cold rolling for 2 passes by adopting an LD30 three-roller cold rolling mill, carrying out deoiling after each pass of cold rolling, carrying out solution heat treatment in a pure hydrogen protection bright heat treatment furnace, and then carrying out straightening, inner and outer surface inspection, coping and inner and outer polishing;
finally, carrying out cold drawing forming for 1 time by adopting an LB63 cold drawing machine, and then carrying out deoiling, straightening and internal and external surface inspection to obtain a finished product pipe;
(VII) examination
Performing ultrasonic inspection on the finished pipes obtained in the step (six) one by one, wherein the size of the artificial defect of the ultrasonic inspection standard sample is 0.04mm multiplied by 3mm multiplied by 0.08 mm;
(eighth) cleaning
Cleaning the outer surface: wiping the outer surface of the finished product pipe with cotton cloth dipped with acetone or alcohol one by one until the outer surface is free from oil stains and color spots caused by foreign matters, and finally wiping the finished product pipe clean with dry white cotton cloth;
cleaning the inner surface: cleaning the wool felt plugs one by blowing white wool felt plugs dipped with acetone or alcohol into the tube holes of the finished product tube by using high-pressure nitrogen until the cleaned wool felt plugs have no color spots caused by oil stains and foreign matters on the surfaces, and finally drying the wool felt plugs or the white cotton cloth;
(nine) identification and package
Performing sleeve identification on each finished product cladding tube in a bar code identification mode;
after marking, the two ends are sealed firmly by plastic plugs, pentachloroethylene plastic bags are sleeved one by one, and then the cladding pipes are bundled and put into a wooden box.
The technical scheme of the invention is further defined as follows:
further, in the manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor, in the step (three), a centering hole with the diameter of phi 12 +/-2 mm is drilled at one end of the round tube blank, then hot perforation is carried out on a cross rolling perforation unit, the heating temperature is 1130-1170 ℃, the heating time is 100-120 min, the heat preservation time is 10-15 min, the guide plate spacing is 79mm, the roller spacing is 69mm, the specification of the pierced billet after hot perforation is phi 80 multiplied by 7.5mm, the cooling mode is water cooling, the deviation of the outer diameter is controlled to be +/-3%, and the deviation of the wall thickness is controlled to be +/-10%.
In the manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor, in the step (six), 2 passes of cold rolling are carried out through an LG60 cold rolling tube mill, the cold rolling passes are matched with a cold rolling pass and a core rod to be respectively rolled to phi 51 multiplied by 3.5mm and phi 30 multiplied by 2.2mm, the cold rolling deformation is 60-70%, the feeding amount is 1-4 mm/time, the rolling speed is 40-60 times/min, the outer diameters are respectively controlled to be 51 +/-0.30 mm and 30 +/-0.20 mm, the wall thicknesses are respectively controlled to be 3.5 +/-0.25 mm and 2.2 +/-0.15 mm, oil removal is carried out after each pass of cold rolling, solution heat treatment is carried out in a continuous roller hearth furnace, the heat treatment temperature is 1060-1080 ℃, the heat preservation is carried out for 6-10 min, the cooling mode is water cooling, straightening is carried out, the straightness is controlled to be not more than 1.5mm/m, and then acid cleaning, inner and outer surface inspection.
In the manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor, in the step (VI), 1 pass of cold rolling is carried out through an LG30 cold rolling tube mill, a cold rolling pass and a core rod are matched to roll to phi 16 multiplied by 1.6mm, the cold rolling deformation is 60-70%, the feeding amount is 1-4 mm/time, the rolling speed is 40-60 times/min, the outer diameter is controlled to be 16 +/-0.10 mm, the wall thickness is controlled to be 1.6 +/-0.10 mm, after the cold rolling, acetone is used for deoiling, and solution heat treatment is carried out in a pure hydrogen protection bright heat treatment furnace, the heat treatment temperature is 1060-1080, the heat preservation is carried out for 4-8 min, the cooling mode is water jacket cooling, straightening is carried out, the straightness is controlled to be less than or equal to 1.0mm/m, and then internal and external surface.
In the manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor, in the step (VI), 2 passes of cold rolling are carried out through an LD30 three-roll cold rolling tube mill, the cold rolling passes and a core rod are matched to be respectively rolled to phi 14 multiplied by 1mm and phi 11.2 multiplied by 0.58mm, the cold rolling deformation is 40-55%, the feeding amount is 1-3 mm/time, the rolling speed is 50-60 times/min, the outer diameters are respectively controlled to be 14 +/-0.05 mm and 11.2 +/-0.03 mm, the wall thicknesses are respectively controlled to be 1 +/-0.05 mm and 0.58 +/-0.03 mm, acetone is removed after the cold rolling, solution heat treatment is carried out in a pure hydrogen protection bright heat treatment furnace, the heat treatment temperature is 1060-1080, the heat preservation is carried out for 4-8 min, the cooling mode is water jacket cooling, straightening is carried out, the inner and outer surfaces are inspected, polished, and polished.
In the manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor, in the step (six), finished products are cold-drawn through an LB63 cold-drawing machine, the finished products are drawn to phi 9.3 multiplied by 0.6mm by matching with a cold-drawing die, the cold-drawing deformation is 15-20%, the cold-drawing speed is 8-12 m/min, the outer diameter is controlled to be 9.3 +/-0.03 mm, the wall thickness is controlled to be 0.6 +/-0.03 mm, acetone is used for deoiling after cold-drawing forming, then straightening is carried out, the straightness is controlled to be less than or equal to 0.5mm/m, and then internal and external surface inspection is carried out.
In the manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor, the allowable deviation of the outer diameter of the manufactured stainless steel cladding tube is +/-0.03 mm, and the allowable deviation of the wall thickness is +/-0.03 mm; the roughness Ra of the inner surface is less than or equal to 1.0 mu m, and the roughness Ra of the outer surface is less than or equal to 0.8 mu m; the grain size is 6-10 grade;
r is not more than 650MPa of tensile strength at room temperaturemNot more than 800MPa, yield strength not less than 500Rp0.2Not more than 650MPa, and the elongation A after fracture is not less than 25 percent; hardness at room temperature is not more than 220 HV0.5Less than or equal to 290; high-temperature mechanical properties: r is more than or equal to 600MPa at 100 DEG Cm≤750MPa，450≤Rp0.2Less than or equal to 600MPa, A is more than or equal to 15 percent; r is more than or equal to 550MPa at 200 DEG Cm≤700MPa，450≤Rp0.2Less than or equal to 600MPa, A is more than or equal to 8 percent; r is more than or equal to 550MPa at 300 DEG Cm≤700MPa，450≤Rp0.2Less than or equal to 600MPa, A is more than or equal to 8 percent; r is more than or equal to 550MPa at 400 DEG Cm≤700MPa，450≤Rp0.2Less than or equal to 600MPa, A is more than or equal to 8 percent; r is more than or equal to 500MPa at 500 DEG Cm≤650MPa，400≤Rp0.2Less than or equal to 550MPa, A is more than or equal to 8 percent; r is more than or equal to 450MPa at 600 DEG Cm≤600MPa，350≤Rp0.2Less than or equal to 500MPa, A is more than or equal to 8 percent; r is more than or equal to 350MPa at 700 DEG Cm≤500MPa，200≤Rp0.2Less than or equal to 350MPa, A is more than or equal to 10 percent; r is more than or equal to 300MPa at 800 DEG Cm≤450MPa，150≤Rp0.2≤300MPa，A≥10%。
The invention has the beneficial effects that:
the components of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor of the invention are selectively added with alloy elements, such as
C: 0.04-0.07%, Si: 0.40-0.60%, Cr: 14.50-16.50%, Ni: 14.5-15.5%, Ti: 0.30-0.60%, Co is less than or equal to 0.03%, and Ti/C = 5-7. Wherein:
C and Si: the low-temperature inoculation amount is increased, so that the low-temperature swelling resistance is improved;
ni: the Ni content is higher than that of 316 stainless steel, so that the anti-swelling performance can be improved;
cr: in order to ensure the sodium corrosion resistance (the higher the better) and not obviously reduce the swelling resistance (the lower the better), the content of the sodium corrosion resistance is controlled to be 14.50-16.50%;
ti: the swelling at high temperature is reduced, but the precipitation of Ti and C involves G phase precipitated under the induction of irradiation, and the precipitation of the G phase can exhaust C to accelerate the swelling, so that the ratio of Ti/C needs to be kept between 5 and 7. In addition, the addition of Ti can increase the high-temperature strength and improve the compatibility with the coolant and the fuel;
co: in order to reduce the generation of a radioisotope Co60 by Co in the irradiation process, the content of Co in the material needs to be reduced and needs to be controlled to be less than or equal to 0.03 percent, so a high-quality nickel plate needs to be selected for control during smelting; the cladding tube is 15Cr-15Ni stainless steel, is made of different materials compared with the materials in the prior cladding tube patent, has different element content ranges, is particularly smelted by adopting a vacuum induction and vacuum consumable mode, can control the H, O element content in a lower range, has lower non-metallic inclusion level and pure steel quality, and has good comprehensive performance.
Cold working state (15-20%): in order to give consideration to the strength and ductility of the cladding tube, 15-20% cold deformation is finally adopted, so that recrystallization cannot occur under irradiation, and meanwhile, the radiation swelling resistance can be improved.
The method adopts 5-pass cold rolling and 1-pass cold drawing for forming, the cold rolling deformation is controlled to be 40-70% so as to ensure that crystal grains are fully crushed, finer grain size can be obtained after heat treatment, and the cold drawing deformation of a finished product is 15-20% so as to give consideration to the strength and ductility of the cladding tube; the feeding amount of the 1 st to 3 rd pass is controlled to be 1 to 4 mm/time, the rolling speed is 40 to 60 times/min, and a seamless pipe with good surface quality and high dimensional precision can be obtained; three-roller finish rolling is adopted in the 4 th to 5 th passes, the feeding amount is controlled to be 1-3 mm/time, and the rolling speed is controlled to be 40-55 times/min, so that the surface quality and the dimensional precision of the seamless pipe are better; and the 6 th pass is finished product cold drawing, and the cold drawing speed is 8-12 m/min, so that the surface quality and the dimensional accuracy of the cladding tube reach the optimal degree.
According to the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor, the 1 st to 2 nd pass seamless tube is subjected to solution heat treatment by adopting a continuous roller hearth furnace, the heat treatment temperature is 1060-1080 ℃, and the temperature is controlled at the upper limit, so that the seamless tube is ensured to have better plasticity, and the cold rolling forming in the later process is facilitated; in the 3 rd to 5 th passes, a pure hydrogen protective bright heat treatment furnace is adopted for carrying out solution treatment, the heat treatment temperature is 1060-1080 ℃, and the temperature is controlled to be in the middle limit, so that the seamless pipe is ensured to have good structure and comprehensive mechanical property, good surface quality and subsequent cold processing forming performance; after the 6 th-pass finished product is cold-drawn, no heat treatment is carried out, acetone is adopted for deoiling so as to avoid grain boundary corrosion and stress concentration of crystal grains caused by the acid leaching process and influence on the size precision of the cladding tube, then straightening is carried out, the straightness is controlled to be less than or equal to 0.5mm/m, and then internal and external surface inspection is carried out;
The clad pipe has good processing performance as other 300 series stainless steel, the cold rolling deformation can reach 70 percent at most, the cold rolling deformation of each pass cannot exceed 70 percent, and the risk of rolling cracking can be caused when the cold rolling deformation exceeds the range, but simultaneously, in order to ensure that the structure of the stainless steel can be fully recovered and recrystallized after deformation and heat treatment, the structure uniformity is kept, and the influence of the structure uniformity after the outer diameter and the wall thickness are reduced after cold rolling is reduced, the unevenness is gradually reduced, so the cold rolling deformation is controlled within the range of 40-70 percent.
The stainless steel cladding tube is formed by cold rolling in 5 passes and cold drawing in 1 pass, the solution heat treatment is carried out by adopting a continuous roller hearth furnace after the first 2 cold rolling passes, the temperature is controlled at the middle upper limit, the solution heat treatment of the seamless tube is ensured to be sufficient, and the stainless steel cladding tube has good plasticity so as to facilitate the subsequent cold working, and in addition, the external diameter unevenness and the wall thickness unevenness caused by hot piercing pierced billet can be gradually reduced. After 3-5 passes of cold rolling and deoiling, pure hydrogen is adopted to protect bright heat treatment, a seamless pipe with good surface quality and dimensional accuracy can be obtained, acid pickling is not needed, and environmental pollution caused by acid pickling is avoided.
The stainless steel cladding tube requires that the cold degree is limited to 15-20% in the last cold processing, the mechanical property of the cladding tube has the upper limit requirement, and in order to ensure the cold degree of cold processing and the mechanical property range requirement, the strength and the ductility of the cladding tube are considered, and the cold degree is limited to a smaller range, namely 15-18% in the actual processing process. The stainless steel cladding tube is a small-caliber thin-walled tube, the requirements on surface quality and dimensional accuracy are extremely high, the dimensional deviation and surface roughness are extremely good after the pure hydrogen protection bright heat treatment furnace is adopted for heat treatment, and the dimensional deviation of a finished product is more excellent by controlling the dimensional accuracy of a cold-drawing grinding tool after the finished product is cold-drawn.
In conclusion, the specific components are matched with the specific manufacturing method, the manufacturing method adopts the processes of vacuum induction, vacuum consumable smelting, hot perforation, cold rolling and cold drawing for forming, the components of the cladding tube material are accurately controlled, the level of non-metallic inclusions is effectively controlled, the purity of the cladding tube material is higher, the finished cladding tube product has good structure, high-temperature strength and corrosion resistance, and the use requirements of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor are completely met.
Drawings
FIG. 1 is a flow chart of the manufacturing process of a stainless steel cladding tube for a lead alloy liquid metal cooling fast reactor according to the invention;
fig. 2 is a format diagram of barcode identification in the embodiment of the present invention.
Detailed Description
Example 1
The stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor provided by the embodiment comprises the following components in percentage by weight: c: 0.060%, Si: 0.45%, Mn: 1.58%, P: 0.006%, S: 0.001%, Cr: 16.31%, Ni: 15.05%, Mo: 2.16%, Ti: 0.33%, N: 0.007%, Cu: 0.011%, Al: 0.03%, B: 0.003%, V: 0.19%, Co: 0.01%, Nb: 0.005%, Ta: 0.05%, W: 0.005%, Ca: 0.005%, Zr: 0.005%, H: 0.0001%, O: 0.0005%, As: 0.003 percent, Ti/C =6.0, the addition of rare earth elements is forbidden, the balance is Fe and other trace elements, and the sum of the components is 100 percent.
The manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor has the flow shown in figure 1, and specifically comprises the following steps:
(one) smelting
The cladding tube material is smelted by adopting a double vacuum process, namely Vacuum Induction (VIM) and vacuum consumable electrode (VAR) to reduce gas components and improve purity, and is smelted and cast into a steel ingot with the diameter of 430mm multiplied by 1800-2800 mm by adopting vacuum induction, and then is smelted into a steel ingot with the diameter of 508mm multiplied by 1000-2000 mm by adopting vacuum consumable electrode;
(II) forging
Peeling the surface of the steel ingot obtained in the step (I) to remove surface defects, forging the steel ingot on a 2000-ton quick forging machine in a multi-fire mode to obtain a round pipe blank, wherein the open forging temperature is not less than 1050 ℃, the finish forging temperature is not less than 850 ℃, the cooling mode is water cooling, the remelting heating temperature is 1180 +/-10 ℃, the remelting heat preservation time is 0.7-1.0 h, the total forging elongation coefficient is not less than 3, the forged specification is phi 80mm, the head cutting rate is more than 4%, and the tail cutting rate is more than 6%;
(III) thermal piercing
Peeling the round pipe blank obtained in the step (II), wherein the peeling depth is 1.5-2.0 mm, cutting and sizing on a band sawing machine, drilling a centering hole at one end of the round pipe blank, wherein the diameter of the centering hole is phi 12 +/-2 mm, then performing hot perforation on a cross rolling perforation unit, the heating temperature is 1130-1170 ℃, the heating time is 100-120 min, the heat preservation time is 10-15 min, the distance between guide plates is 79mm, the distance between rollers is 69mm, the specification of the pierced billet after hot perforation is phi 80 multiplied by 7.5mm, the cooling mode is water cooling, the deviation of the outer diameter is controlled to be +/-3%, and the deviation of the wall thickness is controlled to be +/-10%; the hot piercing is carried out on a cross piercing unit after one end of the round tube blank is drilled;
(IV) acid washing
Straightening the hot punched pierced billet obtained in the step (three), cutting off defects at the head and the tail and removing burrs, then carrying out acid cleaning at 60 +/-5 ℃ by adopting a mixed solution of 5-8% hydrofluoric acid and 10-15% nitric acid, inclining the hot punched pierced billet when the hot punched pierced billet enters a cylinder and is taken out of the cylinder, wherein the acid cleaning time is 30-60 min, lifting the hot punched pierced billet once every 10min, washing the inner wall of the steel pipe by using high-pressure water, and observing the acid cleaning quality until the inner wall and the outer wall of the steel pipe are basically free of oxide skin, so that the acid cleaning is judged to be finished;
(V) surface inspection and grinding
Inspecting and polishing the inner surface and the outer surface of the stainless steel pipe obtained in the step (IV) to remove residual slight oxide skin and other defects on the surface, and then performing inside and outside polishing;
(VI) Cold Rolling and Heat treatment
And (5) carrying out cold rolling on the stainless steel pipe obtained in the step (five) for 2 passes by adopting an LG60 rolling mill, and specifically:
respectively rolling to phi 51 multiplied by 3.5mm and phi 30 multiplied by 2.2mm by matching with a cold rolling hole pattern and a core rod, wherein the cold rolling deformation is 60-70%, the feeding amount is 1-4 mm/time, the rolling speed is 40-60 times/min, the outer diameter is respectively controlled to 51 +/-0.30 mm and 30 +/-0.20 mm, the wall thickness is respectively controlled to 3.5 +/-0.25 mm and 2.2 +/-0.15 mm, deoiling is carried out after each pass of cold rolling, solution heat treatment is carried out in a continuous roller hearth furnace, the heat treatment temperature is 1060-1080 ℃, the heat preservation is carried out for 6-10 min, the cooling mode is water cooling, then straightening is carried out, the straightness is controlled to be less than or equal to 1.5mm/m, and then acid washing, inner and outer surface inspection, coping and inner and outer polishing are carried out;
Carrying out cold rolling for 1 pass by adopting an LG30 rolling mill, which specifically comprises the following steps:
the method is characterized in that a cold rolling hole pattern and a core rod are matched to be rolled to phi 16 multiplied by 1.6mm, the cold rolling deformation is 60-70%, the feeding amount is 1-4 mm/time, the rolling speed is 40-60 times/min, the outer diameter is controlled to be 16 +/-0.10 mm, the wall thickness is controlled to be 1.6 +/-0.10 mm, after cold rolling, acetone is adopted for deoiling, solution heat treatment is carried out in a pure hydrogen protection bright heat treatment furnace, the heat treatment temperature is 1060-1080, the heat is preserved for 4-8 min, the cooling mode is water jacket cooling, then straightening is carried out, the straightness is controlled to be less than or equal to 1.0mm/m, and then internal and external surface inspection, grinding and internal;
and then carrying out 2-pass cold rolling by adopting an LD30 three-roller cold rolling mill, which specifically comprises the following steps:
respectively rolling to phi 14 multiplied by 1mm and phi 11.2 multiplied by 0.58mm by matching with a cold rolling hole pattern and a core rod, wherein the cold rolling deformation is 40-55%, the feeding amount is 1-3 mm/time, the rolling speed is 50-60 times/min, the outer diameter is respectively controlled to be 14 +/-0.05 mm and 11.2 +/-0.03 mm, the wall thickness is respectively controlled to be 1 +/-0.05 mm and 0.58 +/-0.03 mm, acetone is adopted for deoiling after each cold rolling pass, solution heat treatment is carried out in a pure hydrogen protection bright heat treatment furnace, the heat treatment temperature is 1060-1080, heat preservation is carried out for 4-8 min, the cooling mode is water jacket cooling, then straightening is carried out, the straightness is controlled to be less than or equal to 0.8mm/m, and then internal and external surface inspection, grinding and internal and external polishing are carried out;
And finally, carrying out cold drawing molding for 1 time by adopting an LB63 cold drawing machine, which specifically comprises the following steps:
drawing to phi 9.3 multiplied by 0.6mm by matching with a cold drawing die, wherein the cold drawing deformation is 15-20%, the cold drawing speed is 8-12 m/min, the outer diameter is controlled to be 9.3 +/-0.03 mm, the wall thickness is controlled to be 0.6 +/-0.03 mm, acetone is adopted for deoiling after cold drawing forming so as to avoid grain boundary erosion and stress concentration caused by an acid leaching process and influence on the size precision of the cladding tube, then straightening is carried out, the straightness is controlled to be less than or equal to 0.5mm/m, and then internal and external surface inspection is carried out to obtain a finished tube;
(VII) examination
Performing ultrasonic inspection on the finished tubes obtained in the step (six) one by one, wherein the size of the artificial defect of the ultrasonic detection standard sample is 0.04mm multiplied by 3mm multiplied by 0.08mm (depth multiplied by length multiplied by width);
carrying out size inspection and surface inspection on each finished tube, wherein the allowable deviation of the outer diameter is +/-0.03 mm, and the allowable deviation of the wall thickness is +/-0.03 mm; the roughness Ra of the inner surface is less than or equal to 1.0 mu m, and the roughness Ra of the outer surface is less than or equal to 0.8 mu m;
then, performing physical and chemical inspection, and finally performing room-temperature tensile test, high-temperature tensile test, hardness test, non-metallic inclusion test, grain size test and intercrystalline corrosion test on the finished pipes in batches;
(eighth) cleaning
Cleaning the outer surface: wiping the outer surface of the finished product pipe with cotton cloth dipped with acetone or alcohol one by one until the outer surface is free from oil stains and color spots caused by foreign matters, and finally wiping the finished product pipe clean with dry white cotton cloth;
Cleaning the inner surface: cleaning the wool felt plugs one by blowing white wool felt plugs dipped with acetone or alcohol into the tube holes of the finished product tube by using high-pressure nitrogen until the cleaned wool felt plugs have no color spots caused by oil stains and foreign matters on the surfaces, and finally drying the wool felt plugs or the white cotton cloth;
(nine) identification and package
Each finished product cladding tube is subjected to sleeve identification in a bar code identification mode, the bar code identification contains a unique number for inquiring an order number, a technical standard number, a grade number of 15-15Ti, a furnace number, a batch number, a cladding tube number, a state and a specification and corresponding physicochemical inspection and nondestructive inspection information, and the identification blank comprises a company name, an order number, a technical standard number, a grade number of 15-15Ti, a furnace number, a batch number, a cladding tube number, a state and a specification, and the format is as shown in the following figure 2;
after marking, immediately firmly sealing two ends by using plastic plugs, sleeving by adopting a pentachloroethylene plastic bag, bundling the cladding tubes, putting into a wooden box, wherein the wooden box is firm enough, and a proper amount of drying agent is put in a proper position according to the number of the cladding tubes and the volume design of the packaging wooden box, the drying agent is strictly prevented from directly contacting with the tubes, and the surface of the sealed and packaged cladding tubes is covered by a layer of plastic film to prevent the packaging bags from being damaged; after the wooden box is packed, a packing list is attached to the wooden box to indicate the name or trademark of a manufacturing plant, the material brand, the specification, the smelting furnace number, the batch number (production batch number) of a heat treatment furnace, the steel pipe number and the like, a mark is attached to the outside of the wooden box, a hoisting part, a balance center mark and a transportation warning mark are indicated at a striking position outside the wooden box, such as marks of 'carefully placing lightly', 'keeping dry', 'the face upwards', 'forbidding a forklift', and the like, and the wooden box cannot be opened during the loading and transporting process is indicated.
In this embodiment, the tolerance of the outer diameter of the prepared stainless steel cladding tube is +/-0.03 mm, and the tolerance of the wall thickness is +/-0.03 mm; the roughness Ra of the inner surface is less than or equal to 0.8 mu m, and the roughness Ra of the outer surface is less than or equal to 0.6 mu m; the grain size is 8.5 grade; room temperature mechanical properties: rm=740MPa，Rp0.2=630MPa，A=29.0%，RmDenotes tensile strength, Rp0.2Represents the yield strength, A represents the elongation after fracture; microscopic Vickers hardness HV at room temperature0.5=270、267、268；
High-temperature mechanical properties: at 100 ℃, Rm=694MPa，Rp0.2=585MPa, A =17.0%, R at 200 ℃m=631MPa，Rp0.2=552MPa, A =12.0%, R at 300 ℃m=622MPa，Rp0.2=544MPa, A =11.0%, R at 400 ℃m=600MPa，Rp0.2=511MPa, A =13.0%, R at 500 ℃m=591MPa，Rp0.2=496MPa, A =14.0%, R at 600 ℃m=537MPa，Rp0.2=448MPa, A =10.0%, R at 700 DEG Cm=441MPa，Rp0.2=282MPa, A =27.0%, R at 800 ℃m=344MPa，Rp0.2=188MPa，A=45.0%。
Example 2
The embodiment provides a stainless steel cladding tube for a lead alloy liquid metal cooling fast reactor, which is characterized by comprising the following components in percentage by weight: c: 0.058%, Si: 0.46%, Mn: 1.61%, P: 0.007%, S: 0.001%, Cr: 16.29%, Ni: 15.03%, Mo: 2.15%, Ti: 0.32%, N: 0.007%, Cu: 0.012%, Al: 0.03%, B: 0.002%, V: 0.20%, Co: 0.01%, Nb: 0.004%, Ta: 0.05%, W: 0.004%, Ca: 0.003%, Zr: 0.004%, H: 0.0001%, O: 0.0006%, As: 0.002%, Ti/C =5.5, addition of rare earth elements is forbidden, the balance is Fe and other trace elements, and the sum of the components is 100%.
By adopting the manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor in the embodiment 1, the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor manufactured by the same manufacturing method has the inner surface roughness Ra of less than or equal to 0.7 μm and the outer surface roughness Ra of less than or equal to 0.5 μm; the allowable deviation of the outer diameter is +/-0.02 mm, and the allowable deviation of the wall thickness is +/-0.02; the grain size is 8.0 grade; room temperature mechanical properties: rm=738MPa，Rp0.2=625MPa，A=29.5%，RmDenotes tensile strength, Rp0.2Represents the yield strength, A represents the elongation after fracture; microscopic Vickers hardness HV at room temperature0.5=268, 265, 264; high-temperature tensile property: at 100 ℃, Rm=691MPa，Rp0.2=582MPa, A =18.0%, R at 200 ℃m=629MPa，Rp0.2=549MPa, A =12.5%, R at 300 ℃m=623MPa，Rp0.2=541MPa, A =11.0%, R at 400 DEG Cm=598MPa，Rp0.2=507MPa, A =12.5%, R at 500 ℃m=588MPa，Rp0.2=494MPa, A =14.5%, R at 600 ℃m=535MPa，Rp0.2=442MPa, A =11.0%, R at 700 DEG Cm=440MPa，Rp0.2=278MPa, a =26.5%, R at 800 ℃m=347MPa，Rp0.2=191MPa，A=44.5%。
Example 3
The embodiment provides a stainless steel cladding tube for a lead alloy liquid metal cooling fast reactor, which is characterized by comprising the following components in percentage by weight: c: 0.059%, Si: 0.44%, Mn: 1.59%, P: 0.005%, S: 0.001%, Cr: 16.29%, Ni: 15.03%, Mo: 2.17%, Ti: 0.34%, N: 0.007%, Cu: 0.014%, Al: 0.03%, B: 0.003%, V: 0.18%, Co: 0.01%, Nb: 0.005%, Ta: 0.05%, W: 0.004%, Ca: 0.005%, Zr: 0.004%, H: 0.0001%, O: 0.0005%, As: 0.002%, Ti/C =5.8, addition of rare earth elements is forbidden, the balance is Fe and other trace elements, and the sum of the components is 100%.
By adopting the manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor in the embodiment 1, the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor manufactured by the same manufacturing method has the inner surface roughness Ra of less than or equal to 0.8 μm and the outer surface roughness Ra of less than or equal to 0.6 μm; the allowable deviation of the outer diameter is +/-0.02 mm, and the allowable deviation of the wall thickness is +/-0.02; the grain size is 8.5 grade; room temperature mechanical properties: rm=743MPa，Rp0.2=632MPa，A=29.5%，RmDenotes tensile strength, Rp0.2Represents the yield strength, A represents the elongation after fracture; microscopic Vickers hardness HV at room temperature0.5=272, 269, 271; high-temperature tensile property: at 100 ℃, Rm=696MPa，Rp0.2=586MPa, A =18.0%, R at 200 ℃m=634MPa，Rp0.2=553MPa, A =12.5%, R at 300 ℃m=624MPa，Rp0.2=542MPa, A =11.5%, R at 400 ℃m=603MPa，Rp0.2=514MPa, A =12.0%, R at 500 ℃m=595MPa，Rp0.2=497MPa, A =13.5%, R at 600 ℃m=539MPa，Rp0.2=451MPa, A =11.0%, R at 700 DEG Cm=444MPa，Rp0.2=281MPa, A =27.5%, R at 800 ℃m=345MPa，Rp0.2=192MPa，A=46.0%。
The stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor manufactured in the examples 1 to 3 was subjected to an intergranular corrosion test:
performing an intercrystalline corrosion test according to the E method in GB/T4334-2008, and a sensitization treatment system: and (2) performing air cooling at 650 ℃ for 2h, wherein the sample is in a semi-tubular shape, the micro-boiling state is kept for continuous 16h after bottling, each sample is bent into two inspected surfaces after testing, the diameter of a bending pressure head is 1mm, the bending angle is 180 degrees, the outer surface of the bent sample is observed under a magnifying lens of 10 times, and no crack is generated due to intergranular corrosion.
The stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor manufactured in the embodiments 1 to 3 has the non-metallic inclusion grade shown in table 1;
table 1 cladding tube non-metallic inclusion grades produced by examples 1-3:
Figure DEST_PATH_IMAGE001
as can be seen from Table 1, the measured value of the content of the nonmetallic inclusion of the cladding tube is lower than the standard required value, the grade represents the purity of the cladding tube, the lower the grade is, the purer the steel quality is, the stainless steel is smelted by adopting a vacuum induction and vacuum self-consumption mode, and the grade of the nonmetallic inclusion can be controlled at a lower level, so that the hot working and cold working performances of the stainless steel are ensured, and the comprehensive performances of the stainless steel, such as plasticity, toughness, strength, fatigue performance, corrosion resistance and the like, can achieve the best effect.
The stainless steel material in the embodiment has good cold processing performance, namely the cold rolling deformation can reach 70% at most, which is higher than that of the stainless steel seamless pipe in the prior art.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims (8)

1. A stainless steel cladding tube for a lead alloy liquid metal cooling fast reactor is characterized by comprising the following components in percentage by weight: c: 0.04-0.07%, Si: 0.40-0.60%, Mn: 1.40-1.90%, P is less than or equal to 0.010%, S is less than or equal to 0.010%, Cr: 14.50-16.50%, Ni: 14.5-15.5%, Mo: 1.50-2.50%, Ti: 0.30-0.60%, N: 0.004-0.012%, Cu is less than or equal to 0.03%, Al is less than or equal to 0.05%, B: 0.002-0.005%, V: 0.15-0.21%, Co is less than or equal to 0.03%, Nb + Ta is less than or equal to 0.3%, W is less than or equal to 0.03%, Ca is less than or equal to 0.005%, Zr is less than or equal to 0.03%, H is less than or equal to 0.0005%, O is less than or equal to 0.0025%, As is less than or equal to 0.005%, Ti/C = 5-7, and the balance of Fe and other trace elements, wherein the sum of the components is 100%.
2. The manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor, which is characterized by comprising the following steps:
(one) smelting
The cladding tube material is smelted by adopting a double vacuum process, namely vacuum induction and vacuum self-consumption, and is smelted and cast into a steel ingot with phi 430mm by adopting vacuum induction, and then the steel ingot with phi 508mm is subjected to vacuum self-consumption;
(II) forging
Peeling the surface of the steel ingot obtained in the step (I), and forging the steel ingot on a 2000-ton quick forging machine in a multi-fire mode to obtain a round pipe blank, wherein the total elongation coefficient of forging is not less than 3, the specification after forging is phi 80mm, the head part resection rate is more than 4%, and the tail part resection rate is more than 6%;
(III) thermal piercing
Peeling the round tube blank obtained in the step (II) to the peeling depth of 1.5-2.0 mm, cutting the round tube blank to a fixed length on a band sawing machine, drilling a centering hole at one end of the round tube blank, and performing hot piercing on an inclined rolling piercing unit to obtain a pierced billet, wherein the specification of the pierced billet after the hot piercing is phi 80 x 7.5 mm;
(IV) acid washing
Straightening the hot punched pierced billet obtained in the step (three), cutting off defects at the head and the tail and removing burrs, then carrying out acid cleaning at 60 +/-5 ℃ by adopting a mixed solution of 5-8% hydrofluoric acid and 10-15% nitric acid, inclining the hot punched pierced billet when the hot punched pierced billet enters a cylinder and is taken out of the cylinder, wherein the acid cleaning time is 30-60 min, lifting the hot punched billet once every 10min, and washing the inner wall of the steel pipe by using high-pressure water;
(V) surface inspection and grinding
Inspecting and polishing the inner and outer surfaces of the stainless steel pipe obtained in the step (IV), and then performing inner and outer through polishing;
(VI) Cold Rolling and Heat treatment
Carrying out cold rolling on the stainless steel pipe obtained in the step (five) by adopting an LG60 rolling mill for 2 passes, deoiling after each cold rolling, carrying out solution heat treatment in a continuous roller hearth furnace, and then carrying out straightening, acid pickling, inner and outer surface inspection, coping and inner and outer polishing;
carrying out cold rolling for 1 pass by adopting an LG30 rolling mill, then deoiling, carrying out solution heat treatment in a pure hydrogen protection bright heat treatment furnace, and then carrying out straightening, inner and outer surface inspection, coping and inner and outer polishing;
carrying out cold rolling for 2 passes by adopting an LD30 three-roller cold rolling mill, carrying out deoiling after each pass of cold rolling, carrying out solution heat treatment in a pure hydrogen protection bright heat treatment furnace, and then carrying out straightening, inner and outer surface inspection, coping and inner and outer polishing;
finally, carrying out cold drawing forming for 1 time by adopting an LB63 cold drawing machine, and then carrying out deoiling, straightening and internal and external surface inspection to obtain a finished product pipe;
(VII) examination
Performing ultrasonic inspection on the finished pipes obtained in the step (six) one by one, wherein the size of the artificial defect of the ultrasonic inspection standard sample is 0.04mm multiplied by 3mm multiplied by 0.08 mm;
(eighth) cleaning
Cleaning the outer surface: wiping the outer surface of the finished product pipe with cotton cloth dipped with acetone or alcohol one by one until the outer surface is free from oil stains and color spots caused by foreign matters, and finally wiping the finished product pipe clean with dry white cotton cloth;
cleaning the inner surface: cleaning the wool felt plugs one by blowing white wool felt plugs dipped with acetone or alcohol into the tube holes of the finished product tube by using high-pressure nitrogen until the cleaned wool felt plugs have no color spots caused by oil stains and foreign matters on the surfaces, and finally drying the wool felt plugs or the white cotton cloth;
(nine) identification and package
Performing sleeve identification on each finished product cladding tube in a bar code identification mode;
after marking, the two ends are sealed firmly by plastic plugs, pentachloroethylene plastic bags are sleeved one by one, and then the cladding pipes are bundled and put into a wooden box.
3. The manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor as claimed in claim 2, characterized in that: in the step (III), a centering hole with the diameter phi of 12 +/-2 mm is drilled at one end of the round pipe blank, then hot piercing is carried out on a cross rolling piercing unit, the heating temperature is 1130-1170 ℃, the heating time is 100-120 min, the heat preservation time is 10-15 min, the guide plate spacing is 79mm, the roller spacing is 69mm, the specification of the pierced billet after hot piercing is phi 80 multiplied by 7.5mm, the cooling mode is water cooling, the deviation of the outer diameter is controlled to be +/-3%, and the deviation of the wall thickness is controlled to be +/-10%.
4. The manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor as claimed in claim 2, characterized in that: in the step (VI), cold rolling is carried out for 2 passes through an LG60 cold rolling mill, the cold rolling passes are matched with a cold rolling pass and a core rod to be respectively rolled to phi 51 multiplied by 3.5mm and phi 30 multiplied by 2.2mm, the cold rolling deformation is 60-70%, the feeding amount is 1-4 mm/time, the rolling speed is 40-60 times/min, the outer diameter is respectively controlled to be 51 +/-0.30 mm and 30 +/-0.20 mm, the wall thickness is respectively controlled to be 3.5 +/-0.25 mm and 2.2 +/-0.15 mm, oil removal is carried out after cold rolling of each pass, solution heat treatment is carried out in a continuous roller hearth furnace, the heat treatment temperature is 1060-1080 ℃, heat preservation is carried out for 6-10 min, the cooling mode is water cooling, then straightening is carried out, the straightness is controlled to be less than or equal to 1.5mm/m, and then acid pickling, inner and outer surface inspection, coping and.
5. The manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor as claimed in claim 2, characterized in that: in the step (VI), cold rolling is carried out for 1 pass through an LG30 cold rolling mill, the cold rolling is matched with a cold rolling pass and a core rod to be rolled to phi 16 multiplied by 1.6mm, the cold rolling deformation is 60-70%, the feeding amount is 1-4 mm/time, the rolling speed is 40-60 times/min, the outer diameter is controlled to 16 +/-0.10 mm, the wall thickness is controlled to 1.6 +/-0.10 mm, acetone is used for deoiling after cold rolling, solution heat treatment is carried out in a pure hydrogen protection bright heat treatment furnace, the heat treatment temperature is 1060-1080, heat preservation is carried out for 4-8 min, the cooling mode is water jacket cooling, straightening is carried out, the straightness is controlled to be less than or equal to 1.0mm/m, and then internal and external surface inspection, polishing and internal and.
6. The manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor as claimed in claim 2, characterized in that: in the step (VI), 2 passes of cold rolling are carried out through an LD30 three-roller cold finish rolling pipe machine, the cold rolling is carried out to phi 14 multiplied by 1mm and phi 11.2 multiplied by 0.58mm respectively by matching with a cold rolling hole pattern and a core rod, the cold rolling deformation is 40-55%, the feeding amount is 1-3 mm/time, the rolling speed is 50-60 times/min, the outer diameter is controlled to be 14 +/-0.05 mm and 11.2 +/-0.03 mm respectively, the wall thickness is controlled to be 1 +/-0.05 mm and 0.58 +/-0.03 mm respectively, after cold rolling, acetone is adopted for deoiling, and solution heat treatment is carried out in a pure hydrogen protection bright heat treatment furnace, the heat treatment temperature is 1060-1080, the heat is preserved for 4-8 min, the cooling mode is water jacket cooling, then straightening is carried out, the straightness is controlled to be less than or equal to 0.8mm/m, and then internal and external.
7. The manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor as claimed in claim 2, characterized in that: in the step (VI), a finished product is cold-drawn by an LB63 cold-drawing machine, the finished product is drawn to phi 9.3 multiplied by 0.6mm by matching with a cold-drawing die, the cold-drawing deformation is 15-20%, the cold-drawing speed is 8-12 m/min, the outer diameter is controlled to be 9.3 +/-0.03 mm, the wall thickness is controlled to be 0.6 +/-0.03 mm, acetone is used for deoiling after cold-drawing forming, then straightening is carried out, the straightness is controlled to be less than or equal to 0.5mm/m, and then internal and external surface inspection is carried out.
8. The manufacturing method of the stainless steel cladding tube for the lead alloy liquid metal cooling fast reactor as claimed in claim 2, characterized in that: the allowable deviation of the outer diameter of the prepared stainless steel cladding tube is +/-0.03 mm, and the allowable deviation of the wall thickness is +/-0.03 mm; the roughness Ra of the inner surface is less than or equal to 1.0 mu m, and the roughness Ra of the outer surface is less than or equal to 0.8 mu m; the grain size is 6-10 grade;
r is not more than 650MPa of tensile strength at room temperaturemNot more than 800MPa, yield strength not less than 500Rp0.2Not more than 650MPa, and the elongation A after fracture is not less than 25 percent; hardness at room temperature is not more than 220 HV0.5Less than or equal to 290; high-temperature mechanical properties: r is more than or equal to 600MPa at 100 DEG Cm≤750MPa，450≤Rp0.2Less than or equal to 600MPa, A is more than or equal to 15 percent; r is more than or equal to 550MPa at 200 DEG Cm≤700MPa，450≤Rp0.2Less than or equal to 600MPa, A is more than or equal to 8 percent; r is more than or equal to 550MPa at 300 DEG Cm≤700MPa，450≤Rp0.2Less than or equal to 600MPa, A is more than or equal to 8 percent; r is more than or equal to 550MPa at 400 DEG Cm≤700MPa，450≤Rp0.2Less than or equal to 600MPa, A is more than or equal to 8 percent; r is more than or equal to 500MPa at 500 DEG Cm≤650MPa，400≤Rp0.2Less than or equal to 550MPa, A is more than or equal to 8 percent; r is more than or equal to 450MPa at 600 DEG Cm≤600MPa，350≤Rp0.2Less than or equal to 500MPa, A is more than or equal to 8 percent; r is more than or equal to 350MPa at 700 DEG Cm≤500MPa，200≤Rp0.2Less than or equal to 350MPa, A is more than or equal to 10 percent; r is more than or equal to 300MPa at 800 DEG Cm≤450MPa，150≤Rp0.2≤300MPa，A≥10%。
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