CN112872263B - Integral forming manufacturing process of integral upper supporting column of reactor internals - Google Patents
Integral forming manufacturing process of integral upper supporting column of reactor internals Download PDFInfo
- Publication number
- CN112872263B CN112872263B CN202011620755.3A CN202011620755A CN112872263B CN 112872263 B CN112872263 B CN 112872263B CN 202011620755 A CN202011620755 A CN 202011620755A CN 112872263 B CN112872263 B CN 112872263B
- Authority
- CN
- China
- Prior art keywords
- supporting column
- upper supporting
- equal
- less
- percent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
-
- 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
-
- C—CHEMISTRY; METALLURGY
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention provides an integral forming manufacturing process of an integral upper supporting column of a reactor internals, which adopts a die forging forming process to complete the forging of the integral upper supporting column, has simple and reasonable process method, better economic practicability and short manufacturing period, cancels all assembly welding and full penetration welding seams, avoids the welding deformation of the structure, improves the forming quality, simultaneously ensures that the room temperature and high temperature mechanical property indexes of the manufactured upper supporting column meet the technical requirements, and has uniform structural material performance.
Description
Technical Field
The invention relates to the technical field of manufacturing of an upper support column of an in-pile component, in particular to an integral forming manufacturing process of an integral upper support column of the in-pile component.
Background
The upper support column of the reactor internals is a key component of the reactor structure and is used for supporting and connecting the upper core plate and providing a protection channel for core measurement. The current common manufacturing process comprises the following steps: the upper supporting column base, the upper supporting column body, the upper supporting column flange and the upper supporting column extension pipe which are processed and formed are subjected to full penetration welding of pipe-pipe butt joint, and welding deformation and structural change of a welding part are easy to generate in the welding process. The section bars required in the manufacturing process comprise plates, bars, pipes and matched welding materials, and the control points in the production process are dispersed, so that the production period is prolonged, and the production cost is increased.
The integral upper supporting column is a novel integral structure without welding connection, which is provided in the key technology of the optimization and improvement of the three-generation pressurized water reactor, and compared with the traditional welding type upper supporting column structure, the integral upper supporting column structure has the advantages of simple structure and convenience in manufacturing, and avoids welding defects and position degree overproof caused by welding deformation. Because the supporting column integrated forged piece is produced in the same furnace batch number, the components, the performance and the like are more stable and reliable, and the use of bars with different performance indexes of different manufacturers is avoided.
Disclosure of Invention
The invention aims to provide a reliable, efficient and economical integral forming manufacturing process of a pile internal member integral upper supporting column aiming at the defects of the traditional welding type upper supporting column manufacturing process.
In order to realize the purpose, the invention adopts the following technical scheme: an integral forming manufacturing process of an integral upper supporting column of a reactor internals comprises the following steps:
s1, selecting a Z2CN19-10 nitrogen-controlling wire material as a raw material;
s2, forging the raw materials by adopting a 3T electroslag remelting steel ingot, cogging to form a round bar, then performing fixed-weight blanking, and cutting off the head and the tail;
s3, adopting a die forging forming process, firstly forming the base part of the upper supporting column, then forming the flange part of the upper supporting column, and finally forming the extension pipe part of the upper supporting column;
s4, after die forging forming, machining the forge piece until the final size and the surface roughness required by a drawing are met;
and S5, boxing the machined integral upper supporting column by using a stepped wooden box.
Preferably, the nitrogen-controlling Z2CN19-10 wire in the step S1 comprises the following components in percentage by weight: less than or equal to 0.026 percent of C, less than or equal to 0.007 percent of P, less than or equal to 0.006 percent of S, less than or equal to 1.30 percent of Mn, less than or equal to 0.44 percent of Si, 19.28 percent of Cr, 9.42 percent of Ni, less than or equal to 0.01 percent of Cu, less than or equal to 0.01 percent of Co, less than or equal to 0.047 percent of N, less than or equal to 0.0008 percent of B, less than or equal to 0.09 percent of Nb and Ta, and is produced by adopting a vacuum furnace smelting and electroslag duplex remelting process.
Preferably, in step S3, the forging ratio is > 3.
Preferably, in step S3, the tempering temperature is less than or equal to 1040 ℃, the heat preservation time is less than or equal to 2 hours, and the finish forging temperature is more than or equal to 800 ℃.
Preferably, 4 dies with different specifications are used in step S3 to complete the forging forming of the upper support column base portion, the upper support column body portion, the upper support column flange portion and the upper support column extension tube portion respectively.
Preferably, step S4 includes the steps of:
s41, straightening the forged piece by using a press, firstly, pressing the two ends of the forged piece to be parallel, and then, straightening the two sides by taking the central position as a reference;
s42, performing rough turning centering on the forge piece, and processing the single edge to 2-3 mm;
s43, forming a central hole in the forged piece according to the minimum inner diameter of the finished product, and reserving finish machining allowance on the single side for 2.5-3 mm; finely machining the inner hole to the requirements of a drawing by using a boring machine, wherein the coaxiality precision control tolerance is +/-0.30 mm, and the end part of the inner hole is protected by using an envelope;
and S44, finely machining the inner hole and the outer circle.
Compared with the prior art, the invention has the beneficial effects that: the forging of the integral upper supporting column is completed by adopting a die forging forming process, the process method is simple and reasonable, the economic practicability is better, the manufacturing period is short, all assembly welding and full penetration welding seams are cancelled, the welding deformation of the structure is avoided, the forming quality is improved, the room-temperature and high-temperature mechanical property indexes of the manufactured upper supporting column meet the technical requirements, and the structural material performance is uniform.
Drawings
FIG. 1 is a schematic structural view of an integral upper support column of the internals according to an embodiment of the present invention;
FIG. 2 is a drawing illustrating a forging process of the integral upper support column of the internals shown in FIG. 1;
fig. 3 is a schematic structural diagram of a forged piece after die forging.
Detailed Description
In order to further understand the objects, structures, features, and functions of the present invention, the following embodiments are described in detail.
The structure of the integral upper support column of the internals of this invention is shown in fig. 1 and comprises an upper support column base section 1, an upper support column section 2, an upper support column flange section 3 and an upper support column extension pipe section 4. The integral forming manufacturing process of the integral upper supporting column comprises the following steps:
s1, selecting a Z2CN19-10 nitrogen control wire material meeting the manufacturing requirement as a raw material, wherein the Z2CN19-10 nitrogen control wire material comprises the following components in percentage by weight: less than or equal to 0.026% of C, less than or equal to 0.007% of P, less than or equal to 0.006% of S, less than or equal to 1.30% of Mn, less than or equal to 0.44% of Si, 19.28% of Cr, 9.42% of Ni, less than or equal to 0.01% of Cu, less than or equal to 0.01% of Co, less than or equal to 0.047% of N, less than or equal to 0.0008% of B, less than or equal to 0.09% of Nb and Ta, and is produced by adopting a vacuum furnace smelting and electroslag remelting duplex process;
s2, forging the raw materials by adopting a 3T electroslag remelting steel ingot, cogging to form a round bar, then performing fixed-weight blanking, and cutting off the head and the tail;
2 round rods A and B with the same specification are prepared, wherein the round rods A are used for forging finished products to perform performance testing, and the round rods B are used for forging finished products to perform machining.
S3, adopting a die forging forming process, as shown in figure 2, firstly forming the upper supporting column base part 1, then forming the upper supporting column body part 2, then forming the upper supporting column flange part 3, and finally forming the upper supporting column extension pipe part 4;
the process uses 4 moulds with different specifications for production, the 4 moulds are respectively used for completing the forging and forming of the upper supporting column base part 1, the upper supporting column body part 2, the upper supporting column flange part 3 and the upper supporting column extension pipe part 4, the forging ratio is more than 3, and multiple times of forging are needed in the forging process; during forging, in order to ensure that the grain size of the large-size bar does not grow, the tempering temperature and time of forging are controlled, the tempering temperature is not more than 1040 ℃, and the heat preservation time is not more than 2 hours. As the grade steel has excellent forgeability, the final forging temperature is not less than 800 ℃.
Taking a forged piece A formed by swaging the round rod A, as shown in FIG. 3, the forged piece A comprises a section A corresponding to the upper support column base part 1, a section B corresponding to the upper support column body part 2, a section C corresponding to the upper support column flange part 3 and a section D corresponding to the upper support column extension pipe part 4. Samples are respectively taken from the end part of the section D, the central part of the section C, the position of the section C close to the section B, the position of the section A close to the section B and the central part of the section A for testing. Wherein, the position of the section C close to the section B and the position of the section A close to the section B should be sampled as close to the axial line as possible. The number of samples per location requirement is: 2 room temperature tensile specimens, 2 high temperature tensile specimens, 2 impact specimens per group of 3.
The sampled materials at each site were subjected to tensile tests at room temperature and at a high temperature of 350 ℃ and the test results are shown in tables 1 and 2.
TABLE 1 Main parameters of the tensile test at room temperature
TABLE 2 main parameters of high-temperature tensile test
As can be seen from the data in tables 1 and 2, the performance result of the forged piece A prepared by the die forging forming process meets the technical index requirements, the overall performance is uniform, and the result deviation is small.
In order to verify the structure condition of each part of the forging, the forging A is divided into four sections according to the figure 3 for detection, and the detection result shows that the forging A has a uniform structure which mainly comprises an austenite structure and a part of ferrite structure.
S4, machining the forged piece B after the round bar B is subjected to die forging molding until the final size and the surface roughness requirements required by a drawing are met;
the process comprises the following steps:
s41, straightening the forged piece B by using a press, firstly pressing the two ends of the forged piece B to be parallel, and then straightening the two sides by taking the central position as a reference;
s42, performing rough turning centering on the forging B, performing single-side processing for 2-3 mm, and processing the blank by using visible light, wherein in order to prevent the bar from being bent due to processing in the processing process, the two center frames are specially manufactured to prevent the support columns from being bent and deformed;
s43, forming a central hole in the forged piece B according to the minimum inner diameter of the finished product, and reserving a finishing allowance on the single side for 2.5-3 mm; finely machining the inner hole to the requirements of a drawing by using a boring machine, controlling the coaxiality precision to be within +/-0.30 mm, and protecting an end sleeve of the inner hole;
and S44, performing finish machining on the inner hole and the outer circle.
S5, the machined integral upper supporting column is boxed by a stepped wooden box, so that bending deformation is avoided.
The integral upper supporting column manufactured by machining the forged piece B meets the technical index requirements, does not have welding deformation, and has good forming quality and short manufacturing period.
The integral forming manufacturing process of the integral upper supporting column of the in-pile member adopts the die forging forming process to finish the forging of the integral upper supporting column, has simple and reasonable process method, better economic practicability and short manufacturing period, cancels all assembly welding and full penetration welding seams, avoids the welding deformation of the structure, improves the forming quality, simultaneously ensures that the room-temperature and high-temperature mechanical property indexes of the manufactured upper supporting column meet the technical requirements, and has uniform structural material properties.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (3)
1. An integral forming manufacturing process of an integral upper supporting column of a reactor internals is characterized by comprising the following steps:
s1, selecting a Z2CN19-10 nitrogen-control wire as a raw material, wherein the Z2CN19-10 nitrogen-control wire is produced by adopting a vacuum furnace smelting and electroslag remelting duplex process;
s2, forging the raw materials by adopting a 3T electroslag remelting steel ingot, cogging to form a round bar, then performing fixed-weight blanking, and cutting off the head and the tail;
s3, adopting a die forging forming process, and respectively completing the forging forming of an upper supporting column base part, an upper supporting column body part, an upper supporting column flange part and an upper supporting column extension pipe part by using 4 dies with different specifications, wherein the upper supporting column base part is formed firstly, then the upper supporting column body part is formed, then the upper supporting column flange part is formed, finally the upper supporting column extension pipe part is formed, the forging ratio is more than 3, the tempering temperature is less than or equal to 1040 ℃, the heat preservation time is less than or equal to 2h, and the final forging temperature is more than or equal to 800 ℃;
s4, after die forging forming, machining the forge piece until the final size and the surface roughness required by a drawing are met;
s5, boxing the machined integral upper supporting column by using a stepped wooden box.
2. The integral forming manufacturing process of the integral upper support column of the in-pile structure according to claim 1, wherein the Z2CN19-10 nitrogen-controlling wire material in the step S1 comprises the following components in percentage by weight: less than or equal to 0.026 percent of C, less than or equal to 0.007 percent of P, less than or equal to 0.006 percent of S, less than or equal to 1.30 percent of Mn, less than or equal to 0.44 percent of Si, 19.28 percent of Cr, 9.42 percent of Ni, less than or equal to 0.01 percent of Cu, less than or equal to 0.01 percent of Co, less than or equal to 0.047 percent of N, less than or equal to 0.0008 percent of B, and less than or equal to 0.09 percent of Nb and Ta.
3. The integrally forming manufacturing process of the in-pile structural member integral type upper supporting column according to claim 1, wherein the step S4 comprises the steps of:
s41, straightening the forged piece by using a press, firstly, pressing the two ends of the forged piece to be parallel, and then, straightening the two sides by taking the central position as a reference;
s42, roughly turning and centering the forge piece, and processing the single side for 2-3 mm;
s43, drilling a central hole in the forging according to the minimum inner diameter of the finished product, and reserving finishing allowance for 2.5-3 mm on one side; finely machining the central hole to the requirements of the drawing by using a boring machine, wherein the coaxiality precision control tolerance is +/-0.30 mm, and the end part of the central hole is protected by an envelope;
and S44, performing finish machining on the central hole and the outer circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011620755.3A CN112872263B (en) | 2020-12-31 | 2020-12-31 | Integral forming manufacturing process of integral upper supporting column of reactor internals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011620755.3A CN112872263B (en) | 2020-12-31 | 2020-12-31 | Integral forming manufacturing process of integral upper supporting column of reactor internals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112872263A CN112872263A (en) | 2021-06-01 |
| CN112872263B true CN112872263B (en) | 2023-02-28 |
Family
ID=76046477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011620755.3A Active CN112872263B (en) | 2020-12-31 | 2020-12-31 | Integral forming manufacturing process of integral upper supporting column of reactor internals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112872263B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101376156A (en) * | 2007-08-28 | 2009-03-04 | 上海重型机器厂有限公司 | Method for forging and pressing component reactor core fulcrum table forging in nuclear pile |
| CN102828009A (en) * | 2011-06-17 | 2012-12-19 | 上海重型机器厂有限公司 | Forging method of austenitic stainless steel forged piece for in-reactor component of nuclear power station reactor |
| CN106917031A (en) * | 2015-12-25 | 2017-07-04 | 上海电气上重铸锻有限公司 | Z3CN18-10 controls the manufacture method of nitrogen austenitic stainless steel forging |
| CN108022657A (en) * | 2017-12-08 | 2018-05-11 | 中国核动力研究设计院 | A kind of end plug and upper support column |
| CN109986282A (en) * | 2017-12-29 | 2019-07-09 | 中国核动力研究设计院 | A kind of support column structure formation method in in-pile component monoblock type |
-
2020
- 2020-12-31 CN CN202011620755.3A patent/CN112872263B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101376156A (en) * | 2007-08-28 | 2009-03-04 | 上海重型机器厂有限公司 | Method for forging and pressing component reactor core fulcrum table forging in nuclear pile |
| CN102828009A (en) * | 2011-06-17 | 2012-12-19 | 上海重型机器厂有限公司 | Forging method of austenitic stainless steel forged piece for in-reactor component of nuclear power station reactor |
| CN106917031A (en) * | 2015-12-25 | 2017-07-04 | 上海电气上重铸锻有限公司 | Z3CN18-10 controls the manufacture method of nitrogen austenitic stainless steel forging |
| CN108022657A (en) * | 2017-12-08 | 2018-05-11 | 中国核动力研究设计院 | A kind of end plug and upper support column |
| CN109986282A (en) * | 2017-12-29 | 2019-07-09 | 中国核动力研究设计院 | A kind of support column structure formation method in in-pile component monoblock type |
Non-Patent Citations (2)
| Title |
|---|
| ACP1000核电堆内构件用大锻件的国产化研制;张智峰等;《装备机械》;20150930(第03期);第46-51页 * |
| 核电站控氮不锈钢Z2CN19-10焊接技术;陈磊等;《电站辅机》;20110930;第32卷(第03期);第40-43页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112872263A (en) | 2021-06-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108914015B (en) | Low-alloy high-strength high-impact-power super-large special-shaped ring forging and forging method thereof | |
| US4472207A (en) | Method for manufacturing blank material suitable for oil drilling non-magnetic stabilizer | |
| CN105252230B (en) | Machining process for inclined tee | |
| US20220126355A1 (en) | Method for forging niobium-tungsten alloy forged ring | |
| CN110125317A (en) | A kind of high-strength stainless steel Hot-rolled Rotary forming method | |
| CN105397000A (en) | Rolling method of titanium alloy plate-shaped forgings | |
| CN107552698A (en) | A kind of forging method of the resistant to hydrogen Steel Bars of HR 2 | |
| CN115558860A (en) | Welding wire for high-strength steel containing vanadium and niobium, welding wire for high-strength steel and production method of welding wire | |
| CN105382157A (en) | Forming method for large special-shaped structural steel multi-step ring piece | |
| CN105441713A (en) | A titanium alloy seamless tube and a manufacturing method thereof | |
| CN105537473A (en) | Forming method of nickel-based high-temperature alloy multi-step large special-shaped ring part | |
| CN112872263B (en) | Integral forming manufacturing process of integral upper supporting column of reactor internals | |
| CN112536406B (en) | Forging drawing method for avoiding surface cracking | |
| JP6135512B2 (en) | Hot upset forging method | |
| CN100590210C (en) | Technological process for improving twin boundary amount in gamma' precipitation strengthened type ferrous alloy | |
| JPH0199740A (en) | Manufacture of high strength stainless steel bolt | |
| JP5387797B1 (en) | Seamless steel pipe manufacturing method | |
| JPH03229839A (en) | Manufacture of duplex stainless steel and its steel material | |
| CN105397417A (en) | Rolling method of high-temperature alloy plate shaped forging | |
| CN105363973A (en) | Method for formation of beta-phase titanium alloy multi-step large profiled ring | |
| CN112496216B (en) | Forging production process of 30Cr15MoN high-nitrogen martensitic stainless steel bar | |
| CN107913964A (en) | A kind of forging method of no magnetic centralizer | |
| CN112719791A (en) | Method for manufacturing titanium and titanium alloy flange | |
| CN111663079B (en) | Processing technology of high-pressure-resistant seamless steel pipe | |
| CN113020313A (en) | Ledeburite die steel seamless steel tube and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |