CN103341724B - Process of producing nuclear power plant main pipeline forge piece through centrifugal casting hollow ingot - Google Patents
Process of producing nuclear power plant main pipeline forge piece through centrifugal casting hollow ingot Download PDFInfo
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Abstract
The invention discloses a process of producing a nuclear power plant main pipeline forge piece through a centrifugal casting hollow ingot, and belongs to the technical field of forging. After the centrifugal casting hollow ingot is reasonably heated and reheated, upsetting forming capable of avoiding serious instability is conducted on the centrifugal casting hollow ingot on a swage block with the cone apex angle ranging from 172 degrees to 178 degrees for at least twice, wherein stretching forming with an inner cooling core rod and stretching forming without an inner cooling core rod are conducted until a low diameter-wall ratio barrel-shaped forge piece with a required forging ratio and required sizes is obtained; barrel-shaped upsetting forge pieces are respectively forged through the swage block to form two hollow brick-shaped branch pipe nozzle rudiments with steps; all straight pipe sections are stretched through a long core rod with a specific diameter in succession until specified sizes are reached; redundant parts of the other side of each rudiment are removed in a machining mode, and therefore the required nuclear power main pipeline stainless steel forge piece is obtained. The process of producing the nuclear power plant main pipeline forge piece through the centrifugal casting hollow ingot has the advantages of being obvious in energy saving effect, consumption reducing effect, working hour saving effect and low-carbon discharging effect when being compared with a forging forming process where solid ingots are widely adopted.
Description
Technical field
The invention belongs to technical field of forging, in particular, provide a kind of technique adopting centrifugal casting hollow ingot production Nuclear power plant main pipeline forging.Centrifugal casting hollow ingot (containing other hollow ingot blank) is adopted to make blank in order to produce the ACPR1000 of TP316LN super-low carbon stainless steel
+, AP1000 main pipeline hollow body forging (containing other cylinder, body pipe fitting).
Background technology
Reactor, steam generator, reactor coolant pump are connected into a closed loop by the main pipeline in nuclear power plant nuclear island, for cooling agent flowing betwixt provides circulation canal and pressure boundary, are the sustainers of nuclear power plant's coolant system.Subject high temperature, high pressure, high flow rate for a long time due to main pipeline and have the working condition of radiation effect and poisonous combustible, require its must have high nuclear stability, low artificial radioactivity, little neutron absorption cross-section, pressure boundary whole property integrity and remain sufficiently stable operating mode compatibility in the military service process reaching 60 years.Adopting the main pipeline that austenitic stainless steel (as TP316LN) manufactures, is the core one-level height end pieces with high technology content and high added value, is also the Focusing on components of China's nuclear power production domesticization always.
With two generations, two generation modified nuclear power generating sets main pipeline form sharp contrast, by the ACPR1000 of new generation of wide core independent development
+with designed non-active AP1000 nuclear power generating sets main pipeline by US Westinghouse company there is following two major features:
1, main pipeline must adopt Forging Technology to produce, and is different from directly adopts centrifugal casting hollow tube to make the technology path of main nuclear power pipeline in the past completely;
2, two branch pipe nozzle on main pipeline must be that overall forging is shaped, and are different from the technical scheme in the past being configured branch pipe nozzle by welding method completely.
In sum, under the prerequisite adopting suitable ingot shape and ingot to weigh, forging goes out the qualified forging of the TP316LN austenitic stainless steel main pipeline with two monolithic molding branch pipe nozzle blanks, becoming in the nature of things and manufacture a very crucial sport technique segment of non-active third generation AP1000 nuclear power generating sets main pipeline, is also one of technical barrier of facing first in history of nuclear power vitals manufacture.
The configuration design of a new generation's main nuclear power pipeline uniqueness and technical requirement, excite the development enthusiasm of lot of domestic and foreign manufacturer.The enterprise such as gondola IBF, domestic upper heavy a, weight, double, boats and ships parent company all successively drops into considerable manpower and materials and has carried out fruitful development work.Particularly go up heavy, 431, the enterprise such as double achieves great breakthrough and the accumulation of preciousness, for the final production domesticization of main pipeline has stepped solid step forward in forging TP316LN austenitic stainless steel main pipeline forging blank.
In above-mentioned enterprise, upper heavy, 431 employing electric slag refusion ingot Production Supervisor road forging blanks; One weight, double employing be then two vacuum casting steel ingots.But they have a common point, to be exactly main pipeline forging be all adopts solid forging forming technology, and namely take the forging preparation technology that solid forging+machined " is emptied ", its basic procedure is as follows:
About 110 tons heavily the solid ingot casting of TP316LN (or, about 80 tons of electric slag refusion ingots) → surperficial car mill of external refining, excision print with the jumping-up of surface inspection → heating → on the hydraulic press of ton, pulling (repeatedly to heat) → monolateral number end to end and get straight length and asymmetry ozzle blank → by machined and empty endoporus and process ozzle until required size.
This technique belongs to solid shaft member forging and molding; Major technique difficulty is the forging of two asymmetry ozzle blanks.Although say that the hit rate of this kind of solid forging is relatively high on the whole, greatly add the mach workload of rear step and difficulty, the recovery rate also greatly reducing expensive raw materials (adopts ingot casting recovery rate to be about 12%; Electric slag refusion ingot is less than 16%), so kind technique does not have energy-saving and cost-reducing potential quality thus weaken its market competitiveness yet.
Summary of the invention
The object of the present invention is to provide a kind of technique adopting centrifugal casting hollow ingot production Nuclear power plant main pipeline forging, through an important technical achievement acquired by repeatedly Computer Simulation and research and development test, produce high-end hollow body forging, especially in order to produce the forging and forming technology of the main pipeline hollow body forging of new generation of TP316LN super-low carbon stainless steel, its core connotation is by high-quality, high recovery rate, high-precision centrifugal casting hollow ingot and the hollow forging forming technology of special type, by a kind of forging technology and mechanical process of uniqueness, combine dexterously, forming one has energy-conservation, consumption reduction, saving working hour, the forming technology of the generation main pipeline forging of low-carbon emission relative advantage and innovation intension.
The present invention strips off the skin through surfaces externally and internally and detects a flaw, the hollow body jumping-up+pull out on the long plug of inner-cooled that about 37 tons of heavy centrifugal casting hollow ingot → heating → carry out on the swage block of particular design are no less than twice is to required size (heat again with several times) → third time hollow body jumping-up again → number to print and adopt and described long plug gets with two mutual dislocation predetermined angulars, the roughing of described " brick body " opposite side redundance → body and ozzle is removed with each straight length of box-shaped ozzle blank → pull out of step and overall dimensions finishing → processing.Concrete technology step is as follows:
(1) Composition Control and analysis are carried out to the low diameter-wall-rate centrifugal casting hollow ingot of casting through external refining molten steel, and turning is carried out to its surfaces externally and internally strip off the skin and detect a flaw;
(2) removing in stove after residual oxide above-mentioned steel ingot at the weak oxide atmosphere (CO maintaining malleation in stove
2=3.0%, CO=20.0%, H
2=28.0%, CH
4=1.0%, H
2o=20.0%, N
2=28.0%) five-part form heating curves is adopted to heat in; Cold ingot charging temperature is 20 ~ 700 DEG C, and heating-up temperature is 1160 ~ 1180 DEG C; Stop incorrect spelling furnace operating (steel grades as spelled stove differs greatly);
(3) on (vertex of a cone angle 172 ° ~ 178 °), the hollow body upsetting formation stopping serious unstability is carried out to the centrifugal casting hollow ingot after described heating on the swage block of band certain taper.This type of jumping-up is no less than twice; And with adopt pull out without plug and the long plug of inner-cooled; Should higher than 1160 DEG C in the maximum temperature that heats again of the middle forging of this process;
(4) third time jumping-up is carried out to the hollow forging of described pulling after heating again; Obtain hollow jumping-up forging;
(5) to the above-mentioned hollow jumping-up forging after heating again, according to the dimensional requirement priority number of carrying out print on long plug of design; Two mutual dislocation predetermined angulars are got respectively and separately " standard " is symmetrical in the square ozzle blank of cylindrical forged piece center line (is saving material by requirements of spacing distance, the square ozzle blank height of tube hub line both sides non-equal, side height is 0.4 times of opposite side.), each straight length is pulled out to required size simultaneously;
(6) brick body is forged on the swage block of particular design the branch pipe nozzle blank with step, each section of appearance and size of finishing simultaneously;
(7) by machined by described hollow forging with the branch pipe nozzle blank opposite side body ledge separately of step cut away, can obtain required in order to produce AP1000 or ACPR1000
+the TP316LN super-low carbon stainless steel hollow body forging blank of main pipeline.
Described centrifugal casting hollow ingot has low diameter-wall-rate (2.5 ~ 5) and the hollow ingot of surfaces externally and internally process and machined and flaw detection.
Described five-part form heating curves refers to: the heating and heat preservation of cold ingot after 700 DEG C of shove charges is considered as one section, and strict distinguish cold ingot heating schedule and middle forging heat again and get the heating schedule after ozzle blank, the former heating maximum temperature is 1180 DEG C, and the latter is for being respectively 1160 DEG C and 1150 DEG C; The heating-up temperature that last one or two fire is secondary and final forging temperature can control at lower 1140 DEG C and 950 DEG C respectively;
The tapering of the long plug of described inner-cooled is 1:150 ~ 1:250.
Propose to adopt centrifugal casting hollow ingot as raw material to produce the process route comprising the high-end pipe fitting forging product of the large scale high-alloy steel of main pipeline, be have abundant Technological Economy according to.Relative to usually adopting the process of forging solid member and adopting the method for solid ingot forging hollow body, adopt the senior cylinder part of centrifugal casting hollow ingot forging, there is a series of unarguable advantage, wherein, mainly contain following some:
1, avoid the high-alloy steel solid ingots such as stainless steel must by a relevant difficult problem for punching, reaming forging large-size cylinder body (as avulsion, punching partially, folding), more can ensure the quality of finished product;
2, for formed a kind of there is energy-saving and cost-reducing advantage and the shorter cylinder part production new technique of technological process provide more high-quality and have more the raw material basis of nearly end form processed edge; This is because the centrifugal blank after machined not only has more higher surface quality and dimensional accuracy, careful detection and control is carried out to it, to guarantee the high hit rate that body forging is produced also more likely in advance;
3, it has not only had more selection by making the production of similar main pipeline one class high-end large-scale cylinder forgings in technique, and likely make follow-up machined become more cheap, more reliably, more efficient, this concerning usually have high cost, long period feature large-scale senior forging production, particularly important.
4, the hardware condition of indispensable ton press need not be required under many circumstances.
Under powerful centrifugal force (about several times in normal gravity) effect, a kind of Special Processes of Metal Castings method of filling and solidification processess is completed as liquid metal, centrifugal casting can obtain that dense structure, grain refinement, degree of purity are higher, the premium casting of good mechanical properties, especially has the cylinder class of rotary middle spindle, tubing, cover class, roller class foundry goods.Under centrifugal action, liquid metal has and good fills type and compensation characteristic, and also contribute to deslagging, exhaust, make steel inclusion and the gas floating inner wall surface moving on to cylindrical shell, the body scope of freedom easily, the latter is removed by machined.As the original blank of follow-up forging, the middle cylinder forging had than being obtained by punching, reaming through the hollow blank of centrifugal casting of inside and outside turning exceeds a lot of dimensional accuracies, and there is the surfaces externally and internally of intimate " zero-fault ", be conducive to the stability and the Quality hit ratio that obtain higher finished product forging precision and forging and molding, obviously can reduce the machined workload of surplus.
Might as well say like this, the high-performance stainless steel forging adopting centrifugal casting hollow ingot to produce Nuclear power plant main pipeline of new generation as raw material is the thing having put on research and development, production schedule, embodying with main pipeline is the high-end cylindrical shell of large scale of representative, a direction of body forging technical progress of industry, and provides new room for promotion for the sector technological innovation.
The present invention, relative to the forging process of existing TP316LN super-low carbon stainless steel solid forging blank and hollow body blank in order to produce AP1000 main pipeline, has following key character and advantage:
1, adopt centrifugal casting hollow ingots as raw material, from source, the quality control of " zero-fault " can be realized raw materials;
2, adopt the special type forging of centrifugal casting hollow ingot with the forging and molding replacing solid ingot, the recovery rate of material is equivalent to more than three times of ingot casting, is equivalent to more than the twice of electroslag remelting solid ingot; Heat time can shorten more than 50%, and energy-saving effect is obvious;
3, adopt so-called hollow " brick body " forging and molding to replace the forging and molding of asymmetrical two solid ozzle blanks, improve the hit rate of forging quality and dimensional accuracy;
4, adopt the relatively limited turnery processing of machined workload to replace the relatively larger solid member internal bore boring processing of machined workload, expectation can reduce rear step machining period about 50%; Greatly can shorten the production cycle of finished product main pipeline;
5, the Plastic Forming degree of finish of forging, precision and the distortion uniformity are better than with asymmetry ozzle solid forging.
Accompanying drawing explanation
Fig. 1 is existing known process flow diagram.
Fig. 2 is technological process graphics of the present invention.
Fig. 3 is the process flow diagram of the embodiment of the present invention.
Detailed description of the invention
Embodiment: below with ACPR1000
+the forging of main pipeline small size simulating piece is that the present invention will be further described for example.
As shown in Figure 2 and Figure 3, be the present invention and the process flow diagram implementing an example thereof, specifically comprise following processing step:
The cardinal principle flow process of forging forming:
Centrifugal casting blank strips off the skin → and blank end taper WEDM → swage block jumping-up → hollow pulling → cored bar pulling → jumping-up → pulling → jumping-up → number print → large Luntai forging → small semicircle pressing → cored bar pulling → number print → little Luntai forging → small semicircle pressing → cored bar straight length pulling → size Luntai flattens into respectively on plug that hollow brick build branch pipe nozzle blank → ozzle blank back-pressure finishing → at nominal diameter is 141mm and adopts special swage block to be pressed into the ozzle blank → ozzle blank back-pressure finishing → appearance and size finishing again with two-stage step again to above-mentioned ozzle blank
The first step, to strip off the skin on request through chemical composition analysis and body surfaces externally and internally, pipe end taper WEDM and flaw detection after, weight is about 1092kg, is of a size of the low diameter-wall-rate centrifugal casting hollow ingot of Φ 460 × 95 × 1249mm, send in the stove through removing residual oxide and heat according to five-part form heating curves (each section of temperature retention time is successively decreased, firing rate increase progressively).Charging temperature is 700 DEG C, and maximum heating temperature is 1180 DEG C; ;
Second step, is of a size of Φ 460 × 95 × 1249mm(by cold conditions Size calculation by heating) hollow ingot on the swage block of particular design, carry out jumping-up by upset ratio 2.0.Forging internal diameter after jumping-up calculates by increasing expansion 40%, and after-swage dimension is Φ 642 × 132 × 624mm(ratio of height to diameter of the ingot is 2.72; Jumping-up thickens rate and is about 40%)
3rd step, melts down and quickly heats up to 1160 DEG C; Without the hollow pulling of plug until external diameter reduces to 510mm, the tube wall thickening rate with 10% calculates, and the forging ' s block dimension after pulling is Φ 510 × 145 × 786mmm; Lengthening coefficient is 1.26.
4th step, then heating after, adopt 1.4 lengthening coefficient at nominal diameter be 189mm long plug on pull out, forging ' s block dimension is afterwards Φ 431 × 121 × 1100mm
5th step, then heating come out of the stove after by described hollow object on the swage block of described particular design, adopt the upset ratio of 1.7, and on average increase expansion amount according to 30% and carry out jumping-up again, to obtain forging ' s block dimension be Φ 559 × 157 × 647mm(ratio of height to diameter of the ingot is 2.55; Jumping-up thickens rate and is about 30%)
6th step, melts down and quickly heats up to 1160 DEG C, adopts the lengthening coefficient of 1.7 after coming out of the stove, at nominal diameter be 215mm long plug on by the pulling of above-mentioned jumping-up part, the forging ' s block dimension after pulling is Φ 440 × 112 × 1100mm
7th step, forging is heated rapidly to 1160 DEG C, after coming out of the stove, hollow object is carried out jumping-up with the upset ratio of 1.83 on the swage block of above-mentioned particular design, and jumping-up part internal diameter increases expansion rate by 34% equally and calculates.Gained forging ' s block dimension is: Φ 592 × 151 × 601mm(ratio of height to diameter of the ingot is 2.5; Jumping-up thickens rate and is about 34%)
7th step, selects diameter to be 260mm(290-30 respectively), 235mm(260-25), 205mm(235-30) long plug number prints and gets large and small ozzle blank: first number print length is 283mm, gets large ozzle blank; Again pull out straight length until when external diameter is 381mm again number print 44mm length to get little ozzle blank, (percentage spread gets 40%, the percentage spread of length direction when namely referring to that circle flattens; The percentage spread about 35% of horizontal direction, the percentage spread of ozzle blank short transverse wall thickness when namely referring to that circle flattens).In this process, the other end starting simultaneously slightly tying two ozzle blanks pulls out straight length (wherein can once above melting down heat again);
8th step, melts down Fast Heating and by lower bound controlled forge process temperature and final forging temperature.Continue repeatedly to forge two ozzle blanks until vertical height between its peak to capillary outer diameter successively reaches 136mm and 51mm, each straight length of synchronous pulling close to 281mm(wherein can once above melting down heat again); Control the gap between plug and pipe fitting internal diameter, to guarantee necessary internal diameter size simultaneously;
9th step, finally selects the long plug of 171mm to be flattened, until the distance between two hammering blocks is equivalent to 281mm perpendicular to secant face and pipe fitting centerline direction on hammering block by described two disks with secant face, local;
Tenth step, melt down and carry out heating again fast of heat insulating ability, temperature controls within 1140 DEG C; The swage block up and down using particular design instead forges two ozzle blanks respectively, until its transverse width reduces to 195mm and 62mm respectively from 281mm; Meanwhile, the height in ozzle direction increases to 177mm and 66mm from 136mmh and 51mm respectively.(rate of increasing is about 30%)
11 step, last finishing is carried out, until meet following forging ' s block dimension to forging:
Straight length: Φ 281 × 55 × 2467mm;
Solid large ozzle brick-shaped blank with the level: 177 × 396 × 281mm;
Solid little ozzle brick-shaped blank with the level: 66 × 62 × 281mm.
Forging blank gross weight is about 960kg.
12 step, by above-mentioned hollow forging with two ozzle blanks opposite side body ledge separately cut away, can obtain required in order to produce ACPR1000
+the high-end hollow body forging blank of TP316LN super-low carbon stainless steel of main pipeline small size simulating piece.
The dimension and weight being finally processed into ACPR main pipeline small size simulating piece is:
Straight length: size Φ 251 × 20 × 2167mm, weight is 253kg
Large nozzle diameter 175mm; Angle 30 °; Height 167m; Transverse projection length 376mm; Weight 38kg
Little nozzle diameter 42mm; Height 56mm; Weight 1kg
The gross weight of ACPR main pipeline 1:3.6 simulating piece is 291kg
Result of calculation evaluation is as follows:
1, the recovery rate of this small size simulating piece of forging TP316LN stainless steel material is about 20%, and size is more full-scale close to 1:1, and recovery rate is higher; The recovery rate of the full-scale simulating piece of 1:1 can reach more than 36% as calculated;
2, total forging ratio of forging each position metal, particularly branch pipe nozzle position metal is all more than 3.5;
3, relative to employing solid ingot, adopt present invention process technology can save more than more than 50% and 65% expensive stainless steel material respectively than electric slag refusion ingot and ingot casting, shorten the heat time more than 40%, save man-hour more than 50%.
The detailed description of the above embodiment of the present invention and accompanying drawing, object is made an explanation by word and diagram, and do not lie in the protection domain limiting claim.Various changes in detailed description of the invention described in present specification; apparent to those skilled in the art; and being in the protection domain of claim and equivalent technologies thereof, any change, amendment not departing from the claims in the present invention all belongs to the content of the present invention's protection.
Claims (4)
1. adopt a technique for centrifugal casting hollow ingot production Nuclear power plant main pipeline forging, it is characterized in that, comprise the following steps:
(1) constituent analysis is carried out to the low diameter-wall-rate centrifugal casting hollow ingot of casting through external refining molten steel, detect and qualifiedly turning is carried out to its surfaces externally and internally strip off the skin and detect a flaw afterwards;
(2) in removing stove, in the weak oxide atmosphere maintaining malleation in stove, five-part form heating curves is adopted to heat to above-mentioned centrifugal casting hollow ingot after residual oxide; Cold ingot charging temperature is 20 DEG C ~ 700 DEG C, and heating maximum temperature is 1160 ~ 1180 DEG C; Stop incorrect spelling furnace operating;
(3) on the swage block of vertex of a cone angle 172 ° ~ 178 °, the hollow body upsetting formation stopping serious unstability is carried out to the centrifugal casting hollow ingot after heating; This type of jumping-up is no less than twice; And adopt between twice jumping-up and pull out without plug and the long plug of inner-cooled, obtain the hollow forging pulled out; In this process, the heating-up temperature again of the hollow forging of pulling should be 1130 DEG C ~ 1160 DEG C;
(4) third time jumping-up is carried out to the hollow forging of described pulling after heating again, obtain hollow jumping-up forging;
(5) to the hollow jumping-up forging after heating again, according to the dimensional requirement priority number of carrying out print on long plug of design; Two mutual dislocation predetermined angulars are got respectively and separately " standard " is symmetrical in the square ozzle blank of cylindrical forged piece center line by requirements of spacing distance, the square ozzle blank height of tube hub line both sides is unequal, wherein side height is 0.4 times of opposite side, pulls out each straight length to required size simultaneously;
(6) brick body is forged on the swage block of particular design the branch pipe nozzle blank with step, each section of appearance and size of finishing simultaneously, obtains hollow forging;
(7) by machined by hollow forging with the branch pipe nozzle blank opposite side body ledge separately of step cut away, namely obtain required in order to produce AP1000 or ACPR1000
+the TP316LN super-low carbon stainless steel hollow body forging blank of main pipeline;
Described five-part form heating curves refers to: the heating and heat preservation of cold ingot after 700 DEG C of shove charges is considered as one section, and strict distinguish cold ingot heating schedule and middle forging heat again and get the heating schedule after ozzle blank, the former heating maximum temperature is 1180 DEG C, and the latter is for being respectively 1160 DEG C and 1150 DEG C; The heating-up temperature that last one or two fire is secondary and final forging temperature control respectively at lower 1140 DEG C and 950 DEG C.
2. technique according to claim 1, is characterized in that: described centrifugal casting hollow ingot has low diameter-wall-rate 2.5 ~ 5 and the hollow ingot of surfaces externally and internally process and machined and flaw detection.
3. technique according to claim 1, is characterized in that: the tapering of the long plug of described inner-cooled is 1:150 ~ 1:250.
4. technique according to claim 1, is characterized in that: described weak oxide atmosphere is CO
2=3.0%, CO=20.0%, H
2=28.0%, CH
4=1.0%, H
2o=20.0%, N
2=28.0%.
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| CN104001844A (en) * | 2014-05-28 | 2014-08-27 | 中国钢研科技集团有限公司 | Forging process for adopting centrifugal casting hollow ingots to produce ring-shaped parts and cylindrical parts |
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| CN105382163B (en) * | 2015-12-21 | 2017-09-19 | 太原科技大学 | The jumping-up pulling device of the prefabricated annular blank of hollow steel ingot |
| CN106825358A (en) * | 2017-01-03 | 2017-06-13 | 清华大学 | A kind of new V anvils and the forging method using the V anvils |
| CN112226595B (en) * | 2020-10-22 | 2022-06-14 | 仪征常众汽车部件有限公司 | Heat treatment process for patch board |
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| US4649492A (en) * | 1983-12-30 | 1987-03-10 | Westinghouse Electric Corp. | Tube expansion process |
| KR100382997B1 (en) * | 2001-01-19 | 2003-05-09 | 한국전력공사 | Method of Manufacturing A Tube and A Sheet of Niobium-containing Zirconium Alloys for High Burn-up Nuclear Fuel |
| CN101670416B (en) * | 2008-09-09 | 2012-02-22 | 上海重型机器厂有限公司 | Forging molding method for million kilowatt nuclear power main pipe |
| CN101745782A (en) * | 2008-12-22 | 2010-06-23 | 二重集团（德阳）重型装备股份有限公司 | Method for manufacturing hot segment of bent pipe of main pipeline of reactor |
| CN101691895B (en) * | 2009-11-03 | 2011-02-02 | 烟台台海玛努尔核电设备有限公司 | Manufacturing process for main pipe line of primary loop in AP1000 nuclear power technology |
| CN101954439A (en) * | 2010-08-17 | 2011-01-26 | 吉林省昊宇石化电力设备制造有限公司 | Forging method of AP1000 nuclear-power main pipeline forging piece |
| CN103103453B (en) * | 2013-02-18 | 2015-02-04 | 无锡市派克重型铸锻有限公司 | Nuclear power pipe fittings material forging and manufacture process |
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