CN113061690A - Method for manufacturing pants-type tee joint of primary loop pipeline of fourth-generation nuclear power fast reactor - Google Patents

Method for manufacturing pants-type tee joint of primary loop pipeline of fourth-generation nuclear power fast reactor Download PDF

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Publication number
CN113061690A
CN113061690A CN202110167163.9A CN202110167163A CN113061690A CN 113061690 A CN113061690 A CN 113061690A CN 202110167163 A CN202110167163 A CN 202110167163A CN 113061690 A CN113061690 A CN 113061690A
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blank
heating
temperature
type tee
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Inventor
刘春海
刘强
李连贵
杨印明
李文亮
党耀星
李福海
丁艳茹
张华剑
袁学飞
贾世广
李文广
韩鹏飞
姜广宇
韩宾
张学良
李海成
赵瑞霞
杨永泽
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Hebei Hongrun Nuclear Equipment Science And Technology Co ltd
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Hebei Hongrun Nuclear Equipment Science And Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C22B9/18—Electroslag remelting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/002—Hybrid process, e.g. forging following casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/14—Making machine elements fittings
    • B21K1/16—Making machine elements fittings parts of pipe or hose couplings
    • C—CHEMISTRY; METALLURGY
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    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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    • C21D1/26—Methods of annealing
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    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
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Abstract

The invention discloses a method for manufacturing a pants-type tee joint of a primary loop main pipeline of a fourth-generation nuclear power fast reactor, which comprises the following steps: remelting the blank by adopting gas shielded electroslag, casting into an electroslag steel ingot, carrying out high-temperature homogenization diffusion annealing on the electroslag steel ingot, heating the annealed electroslag steel ingot, repeatedly thickening and lengthening, and carrying out water cooling to prepare an extruded blank; and (3) heating the extruded blank under controlled temperature, upsetting the extruded blank in a closed mode, carrying out extrusion molding by using a die to form a pant-type tee blank, and carrying out solution treatment on the pant-type tee blank to obtain the pant-type tee. The pant-type tee joint produced by the invention can completely bear the working conditions of high temperature, high pressure and corrosive media and is used in a main loop pipeline.

Description

Method for manufacturing pants-type tee joint of primary loop pipeline of fourth-generation nuclear power fast reactor
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for manufacturing a pants-type tee joint of a primary pipeline of a four-generation nuclear power fast reactor.
Background
The first Chinese fast neutron reactor demonstration engineering nuclear power station of atomic energy science research institute host design will fall in Fujian Xiapu, has the characteristics of high utilization rate of uranium resources, transmutation nuclear waste and high safety, and is the preferred reactor type of the fourth generation advanced nuclear energy system in the world. The method can improve the utilization rate of natural uranium resources from about 1% to more than 60% at present, realizes the minimization of radioactive wastes, and can solve the problems of uranium ore resource exhaustion, low nuclear material utilization rate, difficult nuclear waste treatment and the like.
The high-temperature and high-pressure water enters the U-shaped pipe of the steam generator, exchanges heat with the cooling water of the two loops in the U-shaped pipe, is sent back to the reactor core by the main pump after releasing heat, is reheated and then enters the steam generator. This is continuously circulated in a closed loop, called a loop system. A main pipeline of a primary circuit in a pressurized water reactor nuclear power plant is one of seven key components of a nuclear island, is a part of a system pressure-bearing boundary, is called as an 'main artery' of the nuclear power plant, seals a coolant with high temperature, high pressure and radioactivity and corrosiveness, maintains and restrains the coolant to circularly flow, and plays an important role in guaranteeing the safety and normal operation of a reactor. A main pipeline of a primary circuit is one of core components of fourth-generation fast reactor nuclear power engineering and is shown as 'aortic blood vessels of heart'. A primary pipeline of a primary loop is an important barrier for preventing fission products of nuclear reaction from leaking to a containment vessel under normal, abnormal, accident and test working conditions of a nuclear power station. Therefore, the main pipeline needs to be capable of operating under severe conditions such as high temperature resistance, high pressure resistance, corrosion resistance, strong neutron irradiation and the like, and the design life of the main pipeline is not less than 40 years and the main pipeline cannot be replaced.
The pant tee joint is one of the three-way joints, and the pant tee joint structure is a main pipeline and two branch pipelines, and the branch pipelines are parallel on one surface or on the same straight line. The pant tee is a pipe fitting/pipe connecting piece used at the position of a main pipe needing a branch pipe.
Disclosure of Invention
The invention aims to provide a method for manufacturing a trunk line pant-type tee joint of a primary loop of a fourth-generation nuclear power fast reactor, wherein the produced pant-type tee joint can completely bear the working conditions of high temperature, high pressure and corrosive media and is used in the primary loop.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a manufacturing method of a pants-type tee joint of a main pipeline of a primary loop of a fourth-generation nuclear power fast reactor comprises the following steps:
remelting the blank by adopting gas shielded electroslag, casting into an electroslag steel ingot, carrying out high-temperature homogenization diffusion annealing on the electroslag steel ingot, heating the annealed electroslag steel ingot, repeatedly thickening and lengthening, and carrying out water cooling to prepare an extruded blank;
and (3) heating the extruded blank under controlled temperature, upsetting the extruded blank in a closed mode, carrying out extrusion molding by using a die to form a pant-type tee blank, and carrying out solution treatment on the pant-type tee blank to obtain the pant-type tee.
Further, the blank is made of AISI316H austenitic stainless steel, and is refined by an electric furnace smelting and vacuum oxygen blowing decarburization method to make steel, and an electrode blank is poured; and remelting electroslag by gas protection, and casting into electroslag steel ingots.
Further, the electroslag steel ingot comprises the following components: 0.040-0.050 wt% of C, less than or equal to 0.60 wt% of Si, 1.20-1.80 wt% of Mn, less than or equal to 0.003 wt% of S, less than or equal to 0.015 wt% of P, 17.3-17.8 wt% of Cr, 11.7-12.3 wt% of Ni, 2.5-2.7 wt% of Mo, 0.050-0.070 wt% of N, less than or equal to 0.0015 wt% of B, less than or equal to 25ppm of O, less than or equal to 2.5ppm of H, and the balance of elements: less than or equal to 0.03 weight percent of Al, less than or equal to 0.002 weight percent of Sb, less than or equal to 0.001 weight percent of Pb, less than or equal to 0.015 weight percent of Se, less than or equal to 0.005 weight percent of Sn, less than or equal to 0.05 weight percent of V, less than or equal to 0.01 weight percent of Zn, less than or equal to 0.01 weight percent of As, less than or equal to 0.06 weight percent of Co, and less than or equal to 0.015 weight percent of the.
Further, the high temperature homogenizing diffusion annealing comprises: heating the electroslag steel ingot to 550-600 ℃, wherein the heating rate is less than 50 ℃/h, and keeping the temperature for 3-5 h; continuously heating to 900 ℃ and 950 ℃, wherein the heating rate is less than 50 ℃/h, and keeping the temperature for 3-5 h; continuously heating to 1250 +/-10 ℃, wherein the heating rate is less than 50 ℃/h, and keeping the temperature for 50-70 h; cooling the steel ingot in a furnace to a temperature of less than 1000 ℃, and then air cooling the steel ingot to room temperature to prepare the electroslag steel ingot after the homogenization diffusion annealing.
Further, the forging of the extrusion billet includes:
heating the annealed extrusion blank at the heating rate of less than 60 ℃/h to 550-600 ℃, and preserving heat for 5-7 h; after heat preservation, the temperature is continuously raised to 950 ℃ of 900 ℃ and the temperature raising rate is less than 60 ℃/h, and the heat preservation is carried out for 5-7 h; continuously heating to 1250 +/-10 ℃, wherein the heating rate is less than 60 ℃/h, and keeping the temperature for 17-19 h; carrying out primary forging and pressing, and drawing out after pressing a jaw;
returning the blank after the first forging to a heating furnace, heating to 1220 +/-10 ℃, preserving heat for 5-7h, performing second forging and pressing, and drawing out after upsetting;
returning the second forged blank to the heating furnace, heating to 1180 +/-10 ℃, preserving heat for 5-7h, performing third forging, upsetting, finishing, and cooling the finished extruded blank to room temperature.
Further, the extrusion process includes: modeling by using plastic forming simulation software, controlling the temperature of an extrusion blank and heating to 1150 +/-10 ℃, then performing closed upsetting and fetal membrane extrusion forming on an extruder group to generate a pant-type tee blank, and immediately performing online water cooling on the molded pant-type tee blank.
Further, putting the extruded blank into an inner sleeve of a die for closed upsetting, extruding a pin part, and punching by using a punch to form a semi-hollow tee joint; and (4) cooling the mixture in a mold to room temperature, and preparing a pant-type tee blank by machining.
Further, the extrusion billet heating process comprises: heating the extruded blank at 550-600 ℃ with a temperature rise speed of less than 60 ℃/h, and keeping the temperature for 7-9 h; continuously heating to 900 ℃ and 950 ℃, wherein the heating rate is less than 60 ℃/h, and keeping the temperature for 7-9 h; continuously heating to 1150 +/-10 ℃, keeping the temperature rise rate less than 60 ℃/h, and keeping the temperature for 20-40 h.
Further, the solution treatment includes: heating the pant-type tee blank to 550-600 ℃, wherein the heating speed is less than 60 ℃/h, and keeping the temperature for 4-6 h; continuously heating to 900 ℃ and 950 ℃, wherein the heating rate is less than 60 ℃/h, and keeping the temperature for 4-6 h; and continuously heating to 1070 +/-10 ℃, preserving the temperature for 15-17h, and cooling to room temperature by water to obtain the pant-type tee joint.
The invention has the technical effects that:
the pant-type tee produced by the invention has the following dimensions: maximum height: 1979mm, leg opening width: 2740mm, nozzle size: phi 1250 is multiplied by 30/phi 712 is multiplied by 16, has huge external dimension, bears high temperature and high pressure and strong corrosion in work, and is an important component of a main pipeline of a primary circuit.
The pant-type tee joint has higher purity, density and uniformity, fine and uniform grain size, good toughness and plasticity, welding performance, cold and hot processing performance, excellent high-temperature endurance strength and fatigue resistance, excellent radiation embrittlement resistance, aging resistance, excellent corrosion resistance and the like.
Drawings
FIG. 1 is a diagram of a homogenizing diffusion annealing process of an electroslag steel ingot in the invention;
FIG. 2 is a graph of a process of forging and heating a pant-type tee blank according to the present invention;
figure 3 is a schematic view of a pant-type tee mold of the present invention;
FIG. 4 is a schematic diagram of a pant tee extrusion of the present invention;
FIG. 5 is a graph of a pant-type tee extrusion heating process of the present invention;
FIG. 6 is a heating process graph of the solution treatment of the pants-type tee according to the present invention.
Detailed Description
The following description sufficiently illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce it.
The manufacturing method of the pants-type tee joint of the primary loop pipeline of the fourth-generation nuclear power fast reactor specifically comprises the following steps:
in view of the extremely high requirements of the workpiece on the purity and the uniformity of the material, the following smelting and forging processes are firstly formulated:
step 1: preparing a blank;
(1) selecting the material as AISI316H austenitic stainless steel, refining the steel by adopting an electric furnace smelting and VOD (vacuum oxygen blowing decarburization) refining process, and pouring an electrode blank;
the AISI316H austenitic stainless steel is required to meet the following special requirements in addition to the conventional performance indexes: high enough purity, density and uniformity, proper strength, good toughness and plasticity, fine and uniform grain size, excellent high-temperature endurance strength and fatigue resistance, excellent radiation embrittlement resistance, aging resistance and aging resistance, excellent weldability, cold and hot processability, excellent corrosion resistance and the like.
(2) Remelting by adopting gas protection electroslag, and casting into electroslag steel ingots;
the electroslag steel ingot has the following composition requirements (wt%): 0.040-0.050% of C, less than or equal to 0.60% of Si, 1.20-1.80% of Mn, less than or equal to 0.003% of S, less than or equal to 0.015% of P, 17.3-17.8% of Cr, 11.7-12.3% of Ni, 2.5-2.7% of Mo, 0.050-0.070% of N, less than or equal to 0.0015% of B, less than or equal to 25ppm of O, less than or equal to 2.5ppm of H, and the balance of elements: al is less than or equal to 0.03, Sb is less than or equal to 0.002, Pb is less than or equal to 0.001, Se is less than or equal to 0.015, Sn is less than or equal to 0.005, V is less than or equal to 0.05, Zn is less than or equal to 0.01, As is less than or equal to 0.01, Co is less than or equal to 0.06, and the sum of the five-harmful elements (As + Sb + Bi + Sn + Pb) is less than or equal to.
The non-metallic inclusions of the steel ingot are graded according to the GB/T10561-2005 method, and the grades of the non-metallic inclusions meet the following requirements: class A fineness is not more than 0.5 grade, class B fineness is not more than 1.0 grade, class C fineness is not more than 0.5 grade, class D fineness is not more than 1.0 grade, DS is not more than 1.0 grade, and the sum of the five grades is not more than 1.5 grade. A. B, C, D the sum of the four coarse series is not more than 1.0 grade.
In the preferred embodiment, the size of the electroslag steel ingot is as follows: phi 1200 x 2600, weight of about 24 tons.
(3) Carrying out high-temperature long-time homogenization diffusion annealing on the electroslag steel ingot to eliminate component segregation in the steel ingot and harmful ferrite, and ensuring that the harmful ferrite in the steel is less than or equal to 1 wt%;
as shown in fig. 1, it is a drawing of a homogenizing diffusion annealing process of an electroslag steel ingot in the present invention.
Heating the electroslag steel ingot to 550-600 ℃, wherein the heating rate is less than 50 ℃/h, and keeping the temperature for 4 h; continuously heating to 900 ℃ and 950 ℃, wherein the heating rate is less than 50 ℃/h, and keeping the temperature for 4 h; continuously heating to 1250 +/-10 ℃, wherein the heating rate is less than 50 ℃/h, and keeping the temperature for 60 h; cooling to less than 1000 deg.C, and air cooling to room temperature.
(4) And repeatedly upsetting and lengthening the annealed electroslag steel ingot by adopting a step-shaped heating process to prepare an extruded blank. Not only ensures the internal structure of the billet to be fully forged, but also ensures the original grain size to be thinner, and water cooling is carried out immediately after forging to prevent the grain size from growing up.
Step 2: forging the extrusion blank;
fig. 2 is a graph showing the heating process for forging a pant-type three-way blank according to the present invention.
Forging for the first time: heating the annealed extrusion blank at the heating rate of less than 60 ℃/h to 550-600 ℃, and preserving heat for 6 h; after heat preservation, the temperature is continuously raised to 950 ℃ of 900 ℃ and the temperature raising rate is less than 60 ℃/h, and the temperature is preserved for 6 h; continuously heating to 1250 +/-10 ℃, wherein the heating rate is less than 60 ℃/h, and keeping the temperature for 18 h; forging and pressing the jaw and then drawing out (drawing out a part at 400 of the material body and slightly pressing a phi 700 jaw, wherein the length is about 1000 mm);
forging for the second time: returning the blank after the first forging to a heating furnace, heating to 1220 +/-10 ℃, preserving heat for 6h, forging, upsetting and then lengthening (phi 800 missed-flange upsetting to phi 1700, the length of about 1350mm, then lengthening to phi 1200, the length of about 2700 mm);
forging for the third time: the second forged blank is returned to the heating furnace to be heated to 1180 +/-10 ℃, kept warm for 6h, forged, upset and then finished (upset to phi 1550, length about 1600mm, finished to phi 1300 multiplied by 2150mm), the finished blank is cooled to room temperature by water and finally machined to phi 1250 multiplied by 2000 mm.
And step 3: after the extruded blank is heated by controlling the temperature, the extruded blank is extruded and formed into a pant-type three-way blank;
(1) the metal flow trend in the metal forming process is simulated through QFORM software (plastic forming simulation software), the design and manufacture of a die are improved and optimized, an extrusion process solution is designed, reasonable metal flow is guaranteed, uniform forming of a workpiece is guaranteed, and grains can be effectively refined.
Carrying out simulation calculation according to the boundary conditions designed by the extrusion forming process, wherein the specific parameters are as follows: according to a design drawing of a pipeline system, an upper opening phi 1310mm is multiplied by 2500mm, and a lower opening phi 740 mm;
specification of the die: pier bar size phi 1270; punch size Φ 800;
simulation scheme: carrying out simulation calculation according to the boundary conditions designed by the extrusion forming process, wherein the specific parameters are as follows:
extrusion temperature: 1150 ℃; preheating temperature of the die: 350 ℃; the friction coefficient is 0.03;
the material is as follows: AISI 316H; heat transfer coefficient: 1N/s/mm/° C;
simulation results are as follows: the forming force is about 4.7 ten thousand tons.
(2) And controlling the temperature of the extrusion blank to heat to 1150 +/-10 ℃, then performing closed upsetting and fetal membrane extrusion forming on a 5 ten thousand ton extrusion machine set to generate a pant-type tee blank, and performing on-line water cooling on the molded pant-type tee blank immediately to ensure that crystal grains do not grow up any more.
As shown in fig. 3, it is a schematic view of a pant-type three-way mold according to the present invention.
Installing an extrusion die, wherein the main components of the lower end of the die are as follows: an outer sleeve 6 (made of 5CrNiMo) wound by steel wires, an inner sleeve 5 (made of CHD) matched with the shape of the tee joint, and a movable base 7. The main components of the upper end of the mould are as follows: thick stems 4, punches 3, the thick stems 4, the punches 3 being fixed to the suspension beams 2 of the upper movable platen 1, the thick stems 4 and the punches 2 being displaceable in position relative to each other.
As shown in fig. 4, the schematic diagram of the pant tee extrusion of the present invention is shown.
The extrusion process is formed by two steps:
firstly, heating an extrusion blank to 1150 +/-10 ℃ under controlled temperature, putting the extrusion blank into an inner sleeve 5 of a die for closed upsetting, extruding a pin part, and punching by using a punch 3 to form a half-hollow tee joint;
fig. 5 is a graph showing the pant-type tee extrusion heating process of the present invention.
Heating the extruded blank at the controlled temperature of 550-600 ℃, keeping the temperature for 8h, wherein the heating speed is less than 60 ℃/h; continuously heating to 900 ℃ and 950 ℃, wherein the heating rate is less than 60 ℃/h, and keeping the temperature for 8 h; continuously heating to 1150 +/-10 ℃, keeping the temperature for 30h, wherein the heating rate is less than 60 ℃/h.
And secondly, cooling the water in the die to room temperature, and preparing a pant-type tee blank by machining.
And 4, step 4: and carrying out solution treatment on the blank of the pant-type tee joint to prepare the pant-type tee joint.
FIG. 6 is a graph showing a heating process of solution treatment of a pants-type tee according to the present invention.
Heating the pant-type tee blank to 550-600 ℃, wherein the heating speed is less than 60 ℃/h, and keeping the temperature for 5 h; continuously heating to 900 ℃ and 950 ℃, wherein the heating rate is less than 60 ℃/h, and keeping the temperature for 5 h; and continuously heating to 1070 +/-10 ℃, preserving the heat for 16h, and cooling to room temperature by water to obtain the pant-type tee joint.
And (3) carrying out solution treatment on the pant-type three-way blank, heating and then rapidly cooling the pant-type three-way blank to enable carbides to be fully dissolved and remain in austenite at normal temperature, so that a single-phase austenite structure is obtained at normal temperature, and the steel has the highest corrosion resistance.
The terminology used herein is for the purpose of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (9)

1. A method for manufacturing a pants-type tee joint of a main pipeline of a loop of a fourth-generation nuclear power fast reactor comprises the following steps:
remelting the blank by adopting gas shielded electroslag, casting into an electroslag steel ingot, carrying out high-temperature homogenization diffusion annealing on the electroslag steel ingot, heating the annealed electroslag steel ingot, repeatedly thickening and lengthening, and carrying out water cooling to prepare an extruded blank;
and (3) heating the extruded blank under controlled temperature, upsetting the extruded blank in a closed mode, carrying out extrusion molding by using a die to form a pant-type tee blank, and carrying out solution treatment on the pant-type tee blank to obtain the pant-type tee.
2. The method for manufacturing the trunk line type tee joint of the primary loop of the fourth-generation nuclear power fast reactor as claimed in claim 1, wherein AISI316H austenitic stainless steel is selected as a blank, electric furnace smelting and vacuum oxygen decarburization refining are adopted for steelmaking, and an electrode blank is poured; and remelting electroslag by gas protection, and casting into electroslag steel ingots.
3. The manufacturing method of the pants-type tee joint of the main pipeline of the primary loop of the fourth-generation nuclear power fast reactor as claimed in claim 1, wherein the electroslag steel ingot comprises the following components: 0.040-0.050 wt% of C, less than or equal to 0.60 wt% of Si, 1.20-1.80 wt% of Mn, less than or equal to 0.003 wt% of S, less than or equal to 0.015 wt% of P, 17.3-17.8 wt% of Cr, 11.7-12.3 wt% of Ni, 2.5-2.7 wt% of Mo, 0.050-0.070 wt% of N, less than or equal to 0.0015 wt% of B, less than or equal to 25ppm of O, less than or equal to 2.5ppm of H, and the balance of elements: less than or equal to 0.03 weight percent of Al, less than or equal to 0.002 weight percent of Sb, less than or equal to 0.001 weight percent of Pb, less than or equal to 0.015 weight percent of Se, less than or equal to 0.005 weight percent of Sn, less than or equal to 0.05 weight percent of V, less than or equal to 0.01 weight percent of Zn, less than or equal to 0.01 weight percent of As, less than or equal to 0.06 weight percent of Co, and less than or equal to 0.015 weight percent of the.
4. The method for manufacturing the trunk pipe pant-type tee joint of the primary loop of the fourth-generation nuclear power fast reactor as claimed in claim 1, wherein the high-temperature homogenizing diffusion annealing comprises the following steps: heating the electroslag steel ingot to 550-600 ℃, wherein the heating rate is less than 50 ℃/h, and keeping the temperature for 3-5 h; continuously heating to 900 ℃ and 950 ℃, wherein the heating rate is less than 50 ℃/h, and keeping the temperature for 3-5 h; continuously heating to 1250 +/-10 ℃, wherein the heating rate is less than 50 ℃/h, and keeping the temperature for 50-70 h; cooling the steel ingot in a furnace to a temperature of less than 1000 ℃, and then air cooling the steel ingot to room temperature to prepare the electroslag steel ingot after the homogenization diffusion annealing.
5. The method for manufacturing the trunk pipe type tee joint of the primary loop of the fourth-generation nuclear power fast reactor as claimed in claim 1, wherein the forging of the extrusion billet comprises the following steps:
heating the annealed extrusion blank at the heating rate of less than 60 ℃/h to 550-600 ℃, and preserving heat for 5-7 h; after heat preservation, the temperature is continuously raised to 950 ℃ of 900 ℃ and the temperature raising rate is less than 60 ℃/h, and the heat preservation is carried out for 5-7 h; continuously heating to 1250 +/-10 ℃, wherein the heating rate is less than 60 ℃/h, and keeping the temperature for 17-19 h; carrying out primary forging and pressing, and drawing out after pressing a jaw;
returning the blank after the first forging to a heating furnace, heating to 1220 +/-10 ℃, preserving heat for 5-7h, performing second forging and pressing, and drawing out after upsetting;
returning the second forged blank to the heating furnace, heating to 1180 +/-10 ℃, preserving heat for 5-7h, performing third forging, upsetting, finishing, and cooling the finished extruded blank to room temperature.
6. The manufacturing method of a trunk pipe pant-type tee joint of a primary loop of a fourth-generation nuclear power fast reactor as claimed in claim 1, wherein the extrusion process comprises: modeling by using plastic forming simulation software, controlling the temperature of an extrusion blank and heating to 1150 +/-10 ℃, then performing closed upsetting and fetal membrane extrusion forming on an extruder group to generate a pant-type tee blank, and immediately performing online water cooling on the molded pant-type tee blank.
7. The method for manufacturing the pants-type tee of the main pipeline of a primary loop of a fourth-generation nuclear power fast reactor as claimed in claim 6, wherein the extrusion blank is placed into an inner sleeve of a die for closed upsetting, a pin part is extruded, and a punch is used for punching to form the half-hollow tee; and (4) cooling the mixture in a mold to room temperature, and preparing a pant-type tee blank by machining.
8. The method for manufacturing the pants-type tee joint of the main pipeline of a primary loop of the fourth-generation nuclear power fast reactor as claimed in claim 6, wherein the heating process of the extrusion blank comprises the following steps: heating the extruded blank at 550-600 ℃ with a temperature rise speed of less than 60 ℃/h, and keeping the temperature for 7-9 h; continuously heating to 900 ℃ and 950 ℃, wherein the heating rate is less than 60 ℃/h, and keeping the temperature for 7-9 h; continuously heating to 1150 +/-10 ℃, keeping the temperature rise rate less than 60 ℃/h, and keeping the temperature for 20-40 h.
9. The method for manufacturing the pants-type tee joint of the main pipeline of the primary loop of the fourth-generation nuclear power fast reactor as claimed in claim 1, wherein the solution treatment comprises the following steps: heating the pant-type tee blank to 550-600 ℃, wherein the heating speed is less than 60 ℃/h, and keeping the temperature for 4-6 h; continuously heating to 900 ℃ and 950 ℃, wherein the heating rate is less than 60 ℃/h, and keeping the temperature for 4-6 h; and continuously heating to 1070 +/-10 ℃, preserving the temperature for 15-17h, and cooling to room temperature by water to obtain the pant-type tee joint.
CN202110167163.9A 2021-02-05 2021-02-05 Method for manufacturing pants-type tee joint of primary loop pipeline of fourth-generation nuclear power fast reactor Pending CN113061690A (en)

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CN114182078A (en) * 2021-12-03 2022-03-15 上海电气上重铸锻有限公司 Preparation method of high-strength austenite shaft heavy forging
CN115725814A (en) * 2021-08-27 2023-03-03 天津重型装备工程研究有限公司 Smelting method of steel ingot of main pipeline of nuclear power unit and steel ingot

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CN115725814A (en) * 2021-08-27 2023-03-03 天津重型装备工程研究有限公司 Smelting method of steel ingot of main pipeline of nuclear power unit and steel ingot
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CN114182078A (en) * 2021-12-03 2022-03-15 上海电气上重铸锻有限公司 Preparation method of high-strength austenite shaft heavy forging

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