CN113305166B - Diameter-expanding hot extrusion process for bimetal alloy steel composite pipe - Google Patents
Diameter-expanding hot extrusion process for bimetal alloy steel composite pipe Download PDFInfo
- Publication number
- CN113305166B CN113305166B CN202110385729.5A CN202110385729A CN113305166B CN 113305166 B CN113305166 B CN 113305166B CN 202110385729 A CN202110385729 A CN 202110385729A CN 113305166 B CN113305166 B CN 113305166B
- Authority
- CN
- China
- Prior art keywords
- extrusion
- bimetal
- inner layer
- tube blank
- temperature
- 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
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/22—Making metal-coated products; Making products from two or more metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/005—Continuous extrusion starting from solid state material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/003—Cooling or heating of work
Abstract
A diameter-expanding hot extrusion process for a bimetal alloy steel composite pipe belongs to the technical field of seamless steel pipe forming, and is characterized by comprising the following process steps: 1) normalizing the bimetal as-cast tube blank; 2) expanding and hot extruding the bimetal cast-state tube blank: the extrusion temperature is determined by the inner surface temperature of the inner layer of the tube blank, the extrusion ratio is determined by the wall thickness ratio of the inner layer and the outer layer of the tube blank, and the extrusion speed is determined by the length of the pipe fitting; 3) and (3) quenching and tempering the hot extrusion composite pipe fitting. The invention has the advantages of improving the capability of coordinating plastic deformation of the inner layer and the outer layer, improving the bonding strength of the bonding interface of the inner layer and the outer layer and obtaining the composite pipe fitting with the increased caliber after hot extrusion.
Description
Technical Field
The invention belongs to the technical field of seamless steel pipe forming, and particularly relates to a diameter-expanding hot extrusion process for a bimetal alloy steel composite pipe.
Background
The bimetal alloy steel seamless pipe is a pipe compounded by two different metals, can exert respective performance characteristics, such as high strength, high toughness, wear resistance, corrosion resistance and the like, is a key component in the field of major equipment such as petrochemical industry, nuclear power and thermal power, transportation and the like, is generally manufactured by adopting a hot extrusion process at present, a pipe blank before hot extrusion can be in two tissue states of a forging state and a casting state, when the two pipe blanks before extrusion are in the forging state, the pipe blank is manufactured through the working procedures of upsetting, punching and the like, the tissue compactness is higher, the two pipe blanks in the forging state are embedded and assembled and then extruded to form a composite pipe fitting, the extrusion process mainly ensures the appearance size of the pipe fitting, the process parameter is relatively easy to control, but the process flow is long, the material and energy waste is serious, and the investment of equipment for the upsetting and punching working procedures is huge; when the two pipe blanks before extrusion are in an as-cast state, the hollow as-cast state pipe blanks are respectively manufactured by a centrifugal casting or sand casting method, the tissue compactness is poor, the two as-cast state pipe blanks are embedded and assembled and then extruded into a composite pipe fitting, the extrusion process not only ensures the overall dimension of the pipe fitting, but also more importantly improves the tissue uniformity and the mechanical property, and the process has the outstanding advantages of short manufacturing flow, material and energy conservation, equipment investment conservation and the like.
The Chinese patent application number '201010141598.8' discloses a 20/321H corrosion-resistant bimetal composite pipe and a manufacturing process thereof, and the manufacturing process comprises the following process steps: 1) centrifugally casting to obtain a bimetal composite pipe blank, starting to cast the metal liquid of the 321H inner stainless steel when the temperature of the inner surface of the outer layer 20 steel is cooled to 50-80 ℃ of the melting point of the metal liquid of the outer layer, 2) carrying out hot extrusion on the bimetal composite pipe blank to obtain a pierced billet, 3) carrying out softening treatment on the pierced billet, carrying out cold machining on the pierced billet, and carrying out heat treatment to obtain a finished pipe; the inner layer and the outer layer of the invention are completely metallurgically fused, and are not easy to delaminate in the using process. The Chinese patent application No. 200910222747.0 discloses a method for preparing a bimetallic seamless steel tube for an alkali recovery boiler, which comprises the following process steps: 1) selecting a metallurgically combined bimetallic centrifugal casting composite pipe blank, carrying out primary annealing treatment at the temperature of 1000-1100 ℃, keeping the temperature for 20-30h, 2) extruding the blank at the temperature of 1180-1220 ℃ before extrusion, under the condition that the extrusion ratio is more than 10, 3) carrying out secondary annealing treatment at the temperature of 780-800 ℃, keeping the temperature for 2-3h, and then carrying out air cooling; the outer layer metal of the composite pipe prepared by the method is resistant to alkali corrosion, the inner layer is resistant to high pressure, and the two layers of metal cannot be layered after being flattened and bent.
When the method is adopted to manufacture the bimetal alloy steel pipe, shear friction exists at the contact part of the extrusion cylinder and the pipe blank in the hot extrusion forming process, the performance of the inner-layer and outer-layer combined interface is weak, metal deformation is severe, and the segregation of coarse oxide particles or alloy elements can cause the damage of tissues, so that the interface bonding strength performance is reduced, the extrusion ratio and the extrusion speed in the hot extrusion process are often determined according to experience, the process parameters have important influences on the coordinated plastic deformation capacity of the inner layer and the outer layer of the pipe blank and the performance quality of the pipe after hot extrusion, and the prior art cannot meet the requirement of high-performance accurate manufacturing of the diameter-expanding hot extrusion of the bimetal composite pipe.
Disclosure of Invention
The invention aims to provide a diameter-expanding hot extrusion process for a bimetal alloy steel composite pipe, which can effectively overcome the defects in the prior art.
The invention is realized in such a way, and is characterized by comprising the following process steps:
(1) normalizing the bimetal as-cast tube blank: the normalizing temperature is 880-900 ℃, and the preset heat preservation time t is reached 1 After miningAir-cooling to room temperature with a blower t 1 From the outer layer wall thickness b of the tube blank 01 And inner layer wall thickness b 02 Determination of t 1 ＝(2.2～2.8)×(b 01 +b 02 )，t 1 Unit is min, b 01 And b 02 The unit is mm;
(2) expanding and hot extruding the bimetal cast-state tube blank: as shown in fig. 2, 3 is an outer layer of the bimetal pipe forging, 4 is an inner layer of the bimetal pipe forging, 5 is an extrusion rod, 6 is an extrusion cylinder, 7 is an extrusion convex die, the extrusion temperature T is determined by the inner surface temperature of the inner layer of the pipe blank, the extrusion is started when the temperature T is 1180-1220 ℃, the extrusion ratio lambda is determined by the ratio of the wall thickness of the inner layer and the outer layer of the pipe blank, and lambda is (15-18) x b 01 /b 02 (ii) a The extrusion speed v is determined by the length L of the pipe, and v is (1.1-1.8) multiplied by 10 -2 xL, L is mm; after extrusion, air cooling to room temperature is carried out, and the expanded diameter hot extruded bimetal composite pipe fitting is obtained, as shown in figure 3;
(3) thermal refining treatment of the hot extrusion composite pipe fitting: the quenching temperature is 850-870 ℃, and the quenching heat preservation time t 2 From the wall thickness b of the outer layer of the pipe 1 And inner layer wall thickness b 2 Determination of t 2 ＝(4.2～4.8)×(b 1 +b 2 ) To reach t 2 Cooling the mixture to room temperature by water; the tempering temperature is 580-600 ℃, and the tempering heat preservation time t 3 From b 1 And b 2 Determination of t 3 ＝(5.5～7.5)×(b 1 +b 2 ) To reach t 3 Post air cooling to room temperature t 2 And t 3 Units are min, b 1 And b 2 The unit is mm;
the invention has the advantages and beneficial effects that: the extrusion temperature, the extrusion ratio and the extrusion speed in the hot extrusion process are quickly and accurately determined according to the geometric dimension of the tube blank, and meanwhile, the extrusion temperature is determined according to the inner surface temperature of the inner layer of the tube blank and the large extrusion ratio is adopted, so that the coordinated plastic deformation capacity of the inner layer and the outer layer can be improved, and the bonding strength performance of the bonding interface of the inner layer and the outer layer is improved.
Drawings
FIG. 1 is a dimension identification drawing of a bimetallic as-cast tube blank;
FIG. 2 is a schematic view of expanding hot extrusion of a bimetallic as-cast tube blank;
FIG. 3 is a dimension identification diagram of a hot extruded bimetallic composite pipe forging;
in the figure: 1, a bimetal tube blank outer layer 2, a bimetal tube blank inner layer 3, a bimetal tube forging outer layer 4, a bimetal tube forging inner layer 5, an extrusion rod 6, an extrusion cylinder 7 and an extrusion convex die;
D 0 outside diameter of bimetallic tube blank, d 0 Internal diameter of bimetallic tube 0 Length of bimetallic tube blank, b 01 Outer wall thickness of bimetallic tube blank, b 02 -the inner wall thickness of the bimetallic tube blank, D-the outer diameter of the bimetallic tube forging, D-the inner diameter of the bimetallic tube forging, L-the length of the bimetallic tube forging, b 1 Outer wall thickness of bimetallic pipe forgings, b 2 Inner wall thickness of the bimetallic pipe forging.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
Fig. 1 is a dimension identification diagram of a bimetal as-cast tube blank, and fig. 3 is a dimension identification diagram of a bimetal composite pipe forging after expanding hot extrusion, namely the bimetal composite expanding hot extrusion pipe of the invention.
Example 1
The embodiment provides an expanding hot extrusion process of a bimetal alloy steel composite pipe, wherein an outer layer is pipeline steel X65, an inner layer is stainless steel 304L, and the size of a bimetal cast-state pipe blank is as follows: 820mm in outside diameter D, 60mm in inside diameter D, 700mm in length L, and thickness b of outer layer 01 200mm, inner layer wall thickness b 02 180 mm; the hot extrusion bimetal composite pipe fitting has the following dimensions: 1200mm outside diameter D, 900mm inside diameter D, 790mm length L, outer layer wall thickness b 1 Inner layer thickness b of 40% 2 35 mm; the forming process comprises the following steps:
(1) normalizing the bimetal as-cast tube blank: the normalizing temperature is 880 ℃, and the preset heat preservation time t is reached 1 Cooling to room temperature by a blower after 2.2 (200+180) 836 min;
(2) expanding and hot extruding the bimetal cast-state tube blank: as shown in fig. 2, 3 is twoThe outer layer of the metal pipe forging, 4 is the inner layer of the bimetal pipe forging, 5 is the extrusion rod, 6 is the extrusion cylinder, 7 is the extrusion convex die, the extrusion temperature is determined by the inner surface temperature of the inner layer of the pipe blank, T is 1180 ℃, the extrusion ratio lambda is 15 multiplied by 200/180 is 16.7, the extrusion speed v is 1.1 multiplied by 10 -2 The x 790 is 8.69mm/s, air cooling is carried out to room temperature after extrusion is finished, and the dimension of the bimetal composite expanding hot extrusion pipe is obtained, wherein the outer diameter D is 1200mm, the inner diameter D is 900mm, the length L is 790mm, and the outer layer wall thickness b 1 Inner layer thickness b of 40% 2 35mm as shown in figure 3;
(3) thermal refining treatment of the hot extrusion composite pipe fitting: the quenching temperature is 850 ℃, and the quenching heat preservation time t 2 4.2 × (40+35) ═ 315min, until t 2 Cooling with water to room temperature, tempering at 580 deg.C, and maintaining for t 3 5.5 × (40+35) ═ 412min, t is reached 3 Then air-cooling to room temperature.
Example 2
The embodiment provides an expanding hot extrusion process of a bimetal alloy steel composite pipe, wherein an outer layer is pipeline steel X65, an inner layer is stainless steel 304L, and the size of a bimetal cast-state pipe blank is as follows: 820mm in outside diameter D, 60mm in inside diameter D, 700mm in length L, and thickness b of outer layer 01 200mm, inner layer wall thickness b 02 180 mm; the hot extrusion bimetal composite pipe fitting has the following dimensions: 1200mm outer diameter D, 900mm inner diameter D, 790mm length L, outer layer wall thickness b 1 Inner layer thickness b of 40% 2 35 mm; the forming process comprises the following steps:
(1) normalizing the bimetal as-cast tube blank: the normalizing temperature is 890 ℃, and the preset heat preservation time t is reached 1 After 2.5 (200+180) 950min, air-cooling to room temperature by a blower;
(2) expanding and hot extruding the bimetal cast-state tube blank: as shown in fig. 2, 3 is an outer layer of the bimetal pipe forging, 4 is an inner layer of the bimetal pipe forging, 5 is an extrusion rod, 6 is an extrusion cylinder, 7 is an extrusion punch, the extrusion temperature is determined by the inner surface temperature of the inner layer of the pipe blank, T is 1200 ℃, the extrusion ratio lambda is 16 × 200/180 is 17.7, and the extrusion speed v is 1.5 × 10 -2 X 790 is 11.85mm/s, air cooling is carried out to room temperature after extrusion is finished, and the dimension of the bimetal composite expanded-diameter hot extrusion pipe fitting is obtained, wherein the outer diameter D is 1200mm, and the inner diameter D isDiameter d 900mm, length L790 mm, outer layer wall thickness b 1 40, inner layer thickness b 2 35mm as shown in figure 3;
(3) thermal refining treatment of the hot extrusion composite pipe fitting: the quenching temperature is 860 ℃, and the quenching heat preservation time t 2 4.5 × (40+35) ═ 337min, to t 2 Cooling with water to room temperature at 590 deg.C, and keeping the temperature for t 3 487min (6.5 × (40+35) ×, reached t 3 Then air cooling to room temperature.
Example 3
The embodiment provides an expanding hot extrusion process of a bimetal alloy steel composite pipe, wherein an outer layer is pipeline steel X65, an inner layer is stainless steel 304L, and the size of a bimetal cast-state pipe blank is as follows: 820mm in outside diameter D, 60mm in inside diameter D, 700mm in length L, and thickness b of outer layer 01 200mm, inner layer wall thickness b 02 180 mm; the hot extrusion bimetal composite pipe fitting has the following dimensions: 1200mm outside diameter D, 900mm inside diameter D, 790mm length L, outer layer wall thickness b 1 40, inner layer thickness b 2 35 mm; the forming process comprises the following steps:
(1) normalizing the bimetal as-cast tube blank: the normalizing temperature is 900 ℃, and the preset heat preservation time t is reached 1 After 2.8 (200+180) 1064min, air-cooling to room temperature by using a blower;
(2) expanding and hot extruding the bimetal as-cast tube blank: as shown in fig. 2, 3 is an outer layer of the bimetal pipe forging, 4 is an inner layer of the bimetal pipe forging, 5 is an extrusion rod, 6 is an extrusion cylinder, 7 is an extrusion punch, the extrusion temperature is determined by the inner surface temperature of the inner layer of the pipe blank, T is 1220 ℃, the extrusion ratio λ is 18 × 200/180 is 20, and the extrusion speed v is 1.8 × 10 -2 The x 790 is 14.22mm/s, air cooling is carried out to room temperature after extrusion is finished, and the dimension of the bimetal composite expanding hot extrusion pipe is obtained, wherein the outer diameter D is 1200mm, the inner diameter D is 900mm, the length L is 790mm, and the outer layer wall thickness b 1 40, inner layer thickness b 2 35mm as shown in figure 3;
(3) thermal refining treatment of the hot extrusion composite pipe fitting: the quenching temperature is 870 ℃, and the quenching heat preservation time t 2 4.8 (40+35) 360min, t 2 Cooling with water to room temperature, tempering at 600 deg.C, and holding for t 3 7.5 × (40+35) ═ 562min, until t 3 Then air-cooling to room temperature.
Claims (1)
1. A diameter-expanding hot extrusion process for a bimetal alloy steel composite pipe is characterized by comprising the following process steps:
(1) normalizing the bimetal as-cast tube blank: the normalizing temperature is 880-900 ℃, and the preset heat preservation time t is reached 1 Then air-cooled to room temperature by a blower t 1 From the outer wall thickness b of the tube blank 01 And inner layer wall thickness b 02 Determination of t 1 ＝(2.2～2.8)×(b 01 +b 02 )，t 1 Unit is min, b 01 And b 02 The unit is mm;
(2) expanding and hot extruding the bimetal cast-state tube blank: the extrusion temperature T is determined by the inner surface temperature of the inner layer of the tube blank, the extrusion is started when T is 1180-1220 ℃, the extrusion ratio lambda is determined by the ratio of the wall thickness of the inner layer and the wall thickness of the outer layer of the tube blank, and lambda is (15-18) x b 01 /b 02 (ii) a The extrusion speed v is determined by the length L of the pipe, and v is (1.1-1.8) multiplied by 10 -2 The unit of the L is mm, and the bimetal composite pipe fitting is subjected to air cooling to room temperature after extrusion is finished to obtain an expanded-diameter hot-extruded bimetal composite pipe fitting;
(3) thermal refining treatment of the hot extrusion composite pipe fitting: the quenching temperature is 850-870 ℃, and the quenching heat preservation time t 2 From the wall thickness b of the outer layer of the pipe 1 And inner layer wall thickness b 2 Determination of t 2 ＝(4.2～4.8)×(b 1 +b 2 ) To reach t 2 Cooling the mixture to room temperature by water; the tempering temperature is 580-600 ℃, and the tempering heat preservation time t 3 B is formed by 1 And b 2 Determination of t 3 ＝(5.5～7.5)×(b 1 +b 2 ) To reach t 3 Post air cooling to room temperature t 2 And t 3 Units are min, b 1 And b 2 In mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110385729.5A CN113305166B (en) | 2021-04-10 | 2021-04-10 | Diameter-expanding hot extrusion process for bimetal alloy steel composite pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110385729.5A CN113305166B (en) | 2021-04-10 | 2021-04-10 | Diameter-expanding hot extrusion process for bimetal alloy steel composite pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113305166A CN113305166A (en) | 2021-08-27 |
| CN113305166B true CN113305166B (en) | 2022-09-27 |
Family
ID=77372077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110385729.5A Active CN113305166B (en) | 2021-04-10 | 2021-04-10 | Diameter-expanding hot extrusion process for bimetal alloy steel composite pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113305166B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5263349A (en) * | 1992-09-22 | 1993-11-23 | E. I. Du Pont De Nemours And Company | Extrusion of seamless molybdenum rhenium alloy pipes |
| CN102553961A (en) * | 2010-12-14 | 2012-07-11 | 张皓 | Compound pipe manufacturing technology for metallurgically bonding anti-corrosion special alloy lining with pipeline steel outer sleeve |
| CN109454121A (en) * | 2018-12-21 | 2019-03-12 | 崇州天智轻量化制造有限公司 | The hot extrusion shaping mold of metal composite pipe and the method for preparing metal composite pipe |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101558177B (en) * | 2006-12-13 | 2012-03-28 | 住友轻金属工业株式会社 | High-strength aluminum-base alloy products and process for production thereof |
| US8365568B2 (en) * | 2007-04-20 | 2013-02-05 | Halcor Metal Works S.A. | Seamless multilayer composite pipe |
| ES2602129T3 (en) * | 2008-06-13 | 2017-02-17 | Nippon Steel & Sumitomo Metal Corporation | Process to produce a high alloy seamless tube |
| CN101915273A (en) * | 2010-08-13 | 2010-12-15 | 新兴铸管股份有限公司 | Novel bearing ring material and production process thereof |
| CN102672438B (en) * | 2012-06-04 | 2014-12-31 | 新兴铸管股份有限公司 | Process for producing metallurgical composite double metal seamless steel pipe |
| CN103481033B (en) * | 2013-09-25 | 2015-07-22 | 新兴铸管股份有限公司 | Manufacturing method for double-metal seamless steel pipe through machining, assembling and extruding |
| CN106269948B (en) * | 2016-08-18 | 2018-07-06 | 太原科技大学 | Large-sized heavy-wall tube hot extrusion extrusion angle of die and strand method for determining size |
| CN106825110B (en) * | 2017-03-17 | 2018-10-02 | 郑州大学 | A kind of method for processing forming of intravascular stent kirsite thin footpath thin-walled capillary tubing |
| CN109423571B (en) * | 2017-08-28 | 2019-11-12 | 中国石油天然气集团公司 | A kind of X80 steel-grade seam-less T-joint and its manufacturing method |
| CN109332561A (en) * | 2018-09-21 | 2019-02-15 | 桂林理工大学 | A kind of determination method of the hot rolling blank dimension of centrifugal casting bi-metal double ring |
| CN109746279A (en) * | 2018-12-27 | 2019-05-14 | 桂林理工大学 | A kind of aluminium alloy pipe casting extrusion-rolling combined shaping method |
| CN112008031B (en) * | 2020-08-25 | 2023-06-16 | 无锡继平新材料科技有限公司 | Forging and heat treatment process of valve body for shale gas exploitation |
-
2021
- 2021-04-10 CN CN202110385729.5A patent/CN113305166B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5263349A (en) * | 1992-09-22 | 1993-11-23 | E. I. Du Pont De Nemours And Company | Extrusion of seamless molybdenum rhenium alloy pipes |
| CN102553961A (en) * | 2010-12-14 | 2012-07-11 | 张皓 | Compound pipe manufacturing technology for metallurgically bonding anti-corrosion special alloy lining with pipeline steel outer sleeve |
| CN109454121A (en) * | 2018-12-21 | 2019-03-12 | 崇州天智轻量化制造有限公司 | The hot extrusion shaping mold of metal composite pipe and the method for preparing metal composite pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113305166A (en) | 2021-08-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106583491B (en) | A kind of manufacturing method of Cr-Ni-Mo-Nb nickel-base alloy seamless pipe | |
| CN103522007B (en) | Method for manufacturing TC25 titanium alloy ring piece | |
| CN103934303B (en) | A kind of preparation method of high-performance copper/aluminium composite pipe | |
| CN102873512B (en) | The manufacture method of thick-walled seamless steel pipes in used in nuclear power station heavy caliber | |
| CN109093048B (en) | Large-scale machine brake type forging die and forging method | |
| JP2022511697A (en) | New hollow shaft manufacturing method | |
| US20140053623A1 (en) | Hot extrusion method for producing a metal part, extrusion tool for implementation it and landing gear rod thus produced | |
| CN102294456A (en) | Manufacturing method for oblique rolling of bimetallic compound seamless steel pipe by centrifugal blank | |
| CN106425317A (en) | Preparation method of Ti-B19 high-strength titanium alloy large-caliber thick wall pipe | |
| CN101934341A (en) | Forging technology of TC4 titanium alloy cylindrical part | |
| CN104338882B (en) | The forming method of generation Ⅲ nuclear power cooling medium pump motor casing forging | |
| CN103231209A (en) | Method for producing vacuum-embedded metallurgical composite bimetal seamless tube | |
| CN105033132A (en) | Hollow forging piece profiling forging method of overlong-asymmetric-pipe-mouth-contained reactor coolant piping | |
| CN111037244A (en) | Hollow shaft and manufacturing method thereof | |
| CN109175175B (en) | Precise hot-working forming method for automobile steering ball joint | |
| CN113976789A (en) | Hollow reducing extrusion forming process method for titanium alloy thin-wall super-large cone angle special-shaped ring forging with inner and outer flange structures | |
| CN113305166B (en) | Diameter-expanding hot extrusion process for bimetal alloy steel composite pipe | |
| CN107282854B (en) | A kind of manufacturing process of nuclear power retaining ring | |
| CN107186444A (en) | A kind of hubbed flange processing technology | |
| CN108044315A (en) | A kind of manufacturing method of heavy caliber bimetallic composite corrosion proof seamless tubular goods | |
| CN113510205A (en) | Die forging and roll forming method for high-temperature alloy special-shaped section flange disc-shaped part | |
| CN114523061B (en) | Sectional extrusion forming method for single-layer thick-wall cylinder of high-pressure container and container | |
| CN102658361B (en) | Preparation method for thermal-erosion-resistant composite metal pipe | |
| CN112642947B (en) | Hot-pressing bulging tool and method for hot-pressing bulging thin-wall cylindrical part with necking structure | |
| CN111375717B (en) | Forging process of besides-star wheel with handle |
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 | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20210827 Assignee: Guilin Jianhong Mold Manufacturing Co.,Ltd. Assignor: GUILIN University OF TECHNOLOGY Contract record no.: X2022450000061 Denomination of invention: A kind of expanding hot extrusion process for bimetal alloy steel composite pipe Granted publication date: 20220927 License type: Common License Record date: 20221118 |
|
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20210827 Assignee: Nanning Richong Technology Co.,Ltd. Assignor: GUILIN University OF TECHNOLOGY Contract record no.: X2022450000635 Denomination of invention: A hot extrusion process for expanding the diameter of bimetal alloy steel composite pipe Granted publication date: 20220927 License type: Common License Record date: 20221230 |
|
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20210827 Assignee: GUANGXI SHENGWEI ENERGY TECHNOLOGY Co.,Ltd. Assignor: GUILIN University OF TECHNOLOGY Contract record no.: X2022450000524 Denomination of invention: A hot extrusion process for expanding the diameter of bimetal alloy steel composite pipe Granted publication date: 20220927 License type: Common License Record date: 20221230 |