CN2675286Y - U-shape seamless stainless steel pipe for water heating device - Google Patents
U-shape seamless stainless steel pipe for water heating device Download PDFInfo
- Publication number
- CN2675286Y CN2675286Y CN 200320131577 CN200320131577U CN2675286Y CN 2675286 Y CN2675286 Y CN 2675286Y CN 200320131577 CN200320131577 CN 200320131577 CN 200320131577 U CN200320131577 U CN 200320131577U CN 2675286 Y CN2675286 Y CN 2675286Y
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- stainless steel
- pipe
- shaped
- steel tube
- gapless stainless
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- 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.)
- Expired - Lifetime
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 49
- 239000010935 stainless steel Substances 0.000 title claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 title description 24
- 238000005097 cold rolling Methods 0.000 claims description 26
- 238000007789 sealing Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 27
- 238000000034 method Methods 0.000 description 19
- 230000008569 process Effects 0.000 description 15
- 229910000831 Steel Inorganic materials 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- 238000004140 cleaning Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 10
- 238000012545 processing Methods 0.000 description 9
- 239000011265 semifinished product Substances 0.000 description 9
- 238000005554 pickling Methods 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 239000004744 fabric Substances 0.000 description 6
- 239000000835 fiber Substances 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 229920001187 thermosetting polymer Polymers 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 238000002161 passivation Methods 0.000 description 4
- 238000005482 strain hardening Methods 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000007669 thermal treatment Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The utility model discloses a U-shaped seamless stainless steel pipe for feed water heater. The utility model is radially compressed and formed by the cold reducing and interference of a raw material pipe via a groove mould, the cross section of every part of the U-shaped seamless stainless steel pipe is uniformly in sealed annular shape, wherein the thickness of a wall if between 0. 8 millimeters and 2. 11 millimeters, and the external diameter of the pipe is between the 15. 9 millimeters and 25. 4 millimeters. The length of the spread U-shaped seamless stainless steel pipe is between 24 meters and 30 meters.
Description
Technical field
The utility model relates to the U-shaped gapless stainless steel tube that a kind of feed-water heater is used.
Background technology
Fast development along with the in short supply and power industry of electric power, make also fast development of feed-water heater in the power station steam turbine subsidiary engine, thereby the demand that causes being mainly used in the U-shaped steel pipe of feed-water heater constantly increases, and the austenitic stainless steel U-shaped pipe that is mainly used in feed-water heater at present mostly adopts SA-688M " U " the shape welded tube of import, this U-shaped welded tube not only exists because of import and causes cost too high, problems such as the haul-cycle time is long, and because it is to be welded behind pipe crimping by stainless steel band, even adopt best solder technology, also the existence because of weld seam in use has certain risk, and the specification requirement to welding is too high, further causes cost high.
Manufacturer's desire of part feed-water heater adopts seamless U-shaped stainless steel tube to substitute present employed U-shaped welded tube for this reason, but at present the U-shaped gapless stainless steel tube of making by cold-drawn, cold rolling processing technology is because tube wall is blocked up, caliber is thick, length reaches problems such as U-shaped curved arc part is accurate inadequately inadequately and can not reach the required requirement of feed-water heater, therefore how to provide a kind of have speciality, thin-walled and bend part be U-shaped gapless stainless steel tube that the feed-water heater of semi arch transition uses be in the utility model the creator grind wound motivation place.
In view of this, creator in the utility model relies on it to be engaged in the experience and the practice of relevant industries for many years, and, design finally and a kind ofly have the thin and bend part of speciality, wall and be the U-shaped gapless stainless steel tube that the feed-water heater of semi arch transition is used through concentrating on studies and developing.
Summary of the invention
Main purpose of the present utility model is to solve the problem that is not applicable to the U-shaped gapless stainless steel tube of feed-water heater at present.
U-shaped gapless stainless steel tube in the utility model is cold rolling through annular distance pattern tool by mother tube, interference press molding radially, this U-shaped gapless stainless steel tube cross section everywhere all is the ring-type of sealing, and wall thickness is between 0.8 to 2.11 millimeter, external diameter of pipe is between 15.9 to 25.4 millimeters, and the length after described U-shaped pipe launches is between 24 to 30 meters.
Best, the wall thickness of described U-shaped gapless stainless steel tube is 0.9 ± 0.1 millimeter, and diameter is 16 ± 0.1 millimeters, and the length after the expansion is between 26 to 28 meters.
Best, described U-shaped gapless stainless steel tube cross section everywhere all is the circular of sealing.
U-shaped gapless stainless steel tube in the utility model is mainly used in the feed-water heater in the power station steam turbine subsidiary engine, have small-bore, speciality, tube wall is thin and evenly reach bend part is features such as semi arch transition, not only improve pipe quality, and met the instructions for use of feed-water heater fully.
The utility model is owing to adopted the cold-rolling mill of lengthening and special annular distance pattern tool, and the cold rolling finished-product straight pipe that goes out to have speciality, the thin feature of wall, and through multiple tracks deoil, after the heat treatment, pickling processes again through bend pipe mould and adopt interference radially pressurization be bent into the U-shaped gapless stainless steel tube, this U-shaped gapless stainless steel tube has inwall cleaning, non-oxidation, bend part does not have cold working stress and the remaining chloride of surfaces externally and internally is no more than 10.7mg/m
2Etc. advantage.
Description of drawings
Fig. 1 is the process chart of U-shaped gapless stainless steel tube in the utility model;
Fig. 2 is the structural representation of U-shaped gapless stainless steel tube in the utility model;
Fig. 3 is the structural representation of U-shaped gapless stainless steel tube annular distance pattern tool in the cold-rolling process process in the utility model;
Fig. 4 is the cross-sectional schematic of U-shaped gapless stainless steel tube annular distance pattern tool in the cold-rolling process process in the utility model;
Fig. 5 is the seamless structural representation that shows rust steel pipe bend pipe mould in the bent tube technique process of U-shaped in the utility model;
Fig. 6 is the seamless cross-sectional schematic of showing rust steel pipe bend pipe mould in the bent tube technique process of U-shaped in the utility model.
The specific embodiment
The specific embodiment of the utility model is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 2, U-shaped gapless stainless steel tube 1 is mainly used in feed-water heater in the utility model, and the wall thickness after it is shaped is between 0.8 to 2.11 millimeter, and external diameter of pipe is between 15.9 to 25.4 millimeters, and the length after described U-shaped pipe launches is between 24 to 30 meters.
And the wall thickness that adopts more accurate technology to make to be shaped back U type gapless stainless steel tube is between 0.9 to 1.8 millimeter, and external diameter of pipe is between 16 to 19 millimeters, and the length after described U-shaped pipe launches is between 25 to 30 meters.Also can make wall thickness between 0.9 to 1.0 millimeter, external diameter of pipe is between 16 to 17 millimeters, and the length after described U-shaped pipe launches is between 26 to 28 meters.But preferably wall thickness is 0.9 ± 0.1 millimeter, and external diameter of pipe is 16 ± 0.1 millimeters, launches small-bore, thin-walled, the speciality straight tube of back length between 26 to 28 meters.
It is that 16 ± 0.1mm, wall thickness are 0.9 ± 0.1mm, launch small-bore, thin-walled, the speciality U-shaped gapless stainless steel tube of back length between 26 to 28 meters that desire is made diameter in the utility model, can adopt following various embodiments to finish.
Embodiment one
As shown in Figure 1, make small-bore, thin-walled, speciality U-shaped gapless stainless steel tube comprises the following steps:
1) pipe of φ 80 * 6.5 is bored a hole and the pickling de-scaling is handled, make mother tube;
2) by cold-rolling equipment mother tube is cold-rolled to the intermediate blank pipe that diameter is 38 ± 4mm, the wall thickness of this intermediate blank pipe is 2.5 ± 0.5mm;
3) to the intermediate blank pipe with modes such as deoiling in the present cold-rolling process, intermediate heat-treatment, aligning and pickling deoil, intermediate heat-treatment and pickling processes;
4) further utilize LG60 or LG30 cold-rolling mill with step 2) in the intermediate blank pipe finished to be cold-rolled to diameter be 26 ± 1mm, wall thickness is the middle semi-finished product of 1.6 ± 0.2mm;
5) to middle semifinished tube with modes such as deoiling in the present cold-rolling process, intermediate heat-treatment, aligning and pickling deoil, intermediate heat-treatment and pickling processes;
6) it is that 16 ± 0.1mm, thickness are 0.9 ± 0.1mm, the finished-product straight pipe of length between 24 meters to 30 meters that will be through step 4) cold rolling and after step 5) is handled middle semi-finished product repeatedly back and forth is cold-rolled to diameter via annular distance pattern tool and cold-rolling equipment, and the percentage elongation in this step between middle semi-finished product and the finished-product straight pipe reaches more than 2.5;
7) utilize multifrequency time pressure wiping technology that the finished-product straight pipe of finishing in the step 6) is deoiled and cleaning, this deoils and the cleaning process adopts hairbrush and fiber cloth, and advance hairbrush and fiber cloth to pass finished-product straight pipe inside by means of the water under high pressure of pressure between 1.1 to 1.6MPa, after repeatedly (can be twice) repeats, can wipe the greasy dirt of finished-product straight pipe inside, guarantee high cleanliness requirement small-bore, speciality pipe inside pipe wall;
8) in the step 7) through deoil and cleaning after finished-product straight pipe carry out the molten processing of protective atmosphere thermosetting, the molten processing of this protective atmosphere thermosetting is to adopt ammonia to decompose back nitrogen to be approximately 1: 3 mist with the hydrogen volume ratio, has guaranteed the brightness of steel pipe surfaces externally and internally;
9) utilize bent pipe mold and adopt interference radially pressurization the finished-product straight pipe after the protective atmosphere solution heat treatment in the step 8) is curved speciality, thin-walled, seamless U-shaped stainless steel tube;
10) bend part to the U-shaped gapless stainless steel tube after handling through the step 9) bend pipe carries out solution heat treatment, this solution heat treatment adopts intermediate frequency contact firing equipment (to adopt commercially available equipment, as model is RCWE) local solution heat treatment is carried out at the return bend position, because this solution heat treatment is to bend the cold working stress that produces when being shaped in order to eliminate steel pipe, therefore general only the need handled the less U-shaped gapless stainless steel tube of bending radius, and in order to reduce the electric arc burn rate of contact position, the general temperature of handling is controlled between 1040 ℃ to 1100 ℃, simultaneously during heating and cooling, tube cavity feeds argon gas, to prevent the oxidation of the tube wall thermal treatment zone, the performance of protection steel pipe;
11) bend part to the U-shaped gapless stainless steel tube after the molten processing of step 10) thermosetting carries out the acid wash passivation processing, adopt during this acid wash passivation is handled that concentration of nitric acid is 12%, hydrofluoric acid concentration is 5% mixed liquor, and in temperature is to carry out under 50 ℃ to the 60 ℃ conditions, the oxidation that outer surface produces during with the heat treatment of removing bend part, thus make finished product.
In this embodiment one, step 1) to step 5) all adopts the technology of existing stainless steel tube cold-rolling treatment.
The cold-rolling equipment that step 6) adopts in the present embodiment is existing LG30 cold-rolling mill, but the support of cold-rolling mill rear portion feeder and loading and unloading has been made lengthening to be improved, because this technology can just can realize without any creative work to those skilled in the art, no longer this cold-rolling equipment is elaborated for this reason.As shown in Figure 3 and Figure 4, the mould that is used for cold rolling finished-product straight pipe adopts annular distance pattern tool, this annular distance pattern tool includes one group of opposed roll 20 and can penetrate the middle plug (not shown) of middle semi-finished product, wherein be provided with the perforation 21 that is connected with cold-rolling equipment in the middle of the roll 20, be used to roll the groove 22 that is set to the product straight tube and be provided with one in the wheel periphery, when fastening, 2 pairs of postpones of two rolls, two grooves 22 are a circle, and the groove diameter in finished-product straight pipe exit is the external diameter of pipe of finished-product straight pipe, and the working position of plug is a taper, minimum diameter is the bore of finished-product straight pipe, and wherein an end of plug is directly fixed on the cold-rolling equipment when mounted.Wherein the diameter of plug and roll further groove all reduces by a certain percentage in proper order, and this annular distance pattern tool carries out reciprocating type cold rolling to steel pipe.
As shown in Figure 5 and Figure 6, in the present embodiment interference radially pressurization adopt the mode of clod wash, afterwards produce the phenomenon that wrinkle and collapsible tube appear in bounce-back and short-radius bend inboard in order to prevent to bend, mould 3 is made the radius of radius of circle less than the back bend part that is shaped, and when being shaped, adopt pressuring method, produce predeformation before making steel tube bending, with being of the required size of assurance pipe bounce-back back bend part, and the pipe that forms that bends has advantages such as surface flatness is good, wrinkle resistant line after adopting this mould and pressuring method.
Embodiment two
Make small-bore, thin-walled, speciality U-shaped gapless stainless steel tube comprises the following steps:
1) pipe of φ 65 * 6 is bored a hole and the pickling de-scaling is handled, make mother tube;
2) by cold-rolling equipment mother tube is cold-rolled to the intermediate blank pipe that diameter is 40 ± 5mm, the wall thickness of this intermediate blank pipe is 2.3 ± 0.5mm;
3) further utilize drawbench with step 2) in the intermediate blank pipe finished be cold drawing to diameter between 25 to 27mm, the middle semi-finished product of wall thickness between 1.4 to 1.6mm;
4) will be cold-rolled to diameter via annular distance pattern tool and cold-rolling equipment through the middle semi-finished product after the step 3) cold-drawn is that 16 ± 0.1mm, thickness are 0.9 ± 0.1mm, the finished-product straight pipe of length between 24 meters to 30 meters, and the percentage elongation in this step between middle semi-finished product and the finished-product straight pipe reaches more than 2.5;
5) utilize multifrequency time pressure wiping technology that the finished-product straight pipe of finishing in the step 4) is deoiled and cleaning, this deoils and the cleaning process adopts hairbrush and fiber cloth, and advance hairbrush and fiber cloth to pass finished-product straight pipe inside by means of the water under high pressure of pressure between 1.1 to 1.6MPa, after repeatedly (can be twice) repeats, can wipe the greasy dirt of finished-product straight pipe inside, guarantee high cleanliness requirement small-bore, the speciality inside pipe wall;
6) to deoil through step 5) and cleaning after finished-product straight pipe carry out the molten processing of protective atmosphere thermosetting, the molten processing of this protective atmosphere thermosetting is to adopt ammonia to decompose back nitrogen to be approximately 1: 3 mist with the hydrogen volume ratio, has guaranteed the brightness of steel pipe surfaces externally and internally;
7) utilize bent pipe mold and adopt interference radially pressurization the finished-product straight pipe after the atmosphere solution heat treatment in the step 6) is curved speciality, thin-walled, seamless U-shaped stainless steel tube;
8) bend part to the U-shaped gapless stainless steel tube after handling through the step 7) bend pipe carries out solution heat treatment; intermediate frequency contact firing equipment is adopted in this solution heat treatment; because this solution heat treatment is to bend the cold working stress that produces when being shaped in order to eliminate steel pipe; therefore general only the need handled the less U-shaped gapless stainless steel tube of bending radius; and in order to reduce the electric arc burn rate of contact position; the general temperature of handling is controlled between 1040 ℃ to 1100 ℃; simultaneously during heating and cooling; tube cavity feeds argon gas; to prevent the oxidation of the tube wall thermal treatment zone, the performance of protection steel pipe.
Embodiment three
As shown in Figure 1, make small-bore, thin-walled, speciality U-shaped gapless stainless steel tube comprises the following steps:
Step 1) to 5) identical with embodiment one;
Step 6) is that middle semi-finished product cold rolling through step 4) and after step 5) is handled is cold-rolled to diameter via annular distance pattern tool and cold-rolling equipment is that 16 ± 0.1mm, thickness are 0.9 ± 0.1mm, the finished-product straight pipe of length between 24 meters to 30 meters, and the percentage elongation in this step between middle semi-finished product and the finished-product straight pipe reaches more than 2.5;
Step 7) utilizes multifrequency time pressure wiping technology that the finished-product straight pipe of finishing in the step 6) is deoiled and cleaning, this deoils and the cleaning process adopts hairbrush and fiber cloth, and advance hairbrush and fiber cloth to pass finished-product straight pipe inside by means of the water under high pressure of pressure between 1.1 to 1.6MPa, after repeatedly (can be twice) repeats, can wipe the greasy dirt of finished-product straight pipe inside, guarantee high cleanliness requirement small-bore, speciality pipe inside pipe wall;
Step 8) utilize bent pipe mold and adopt interference radially pressurization with in the step 7) through deoil and cleaning after finished-product straight pipe curve speciality, thin-walled, seamless U-shaped stainless steel tube;
Step 9) is carried out solution heat treatment to the bend part of the U-shaped gapless stainless steel tube after handling through the step 8) bend pipe, this solution heat treatment adopts intermediate frequency contact firing equipment that local solution heat treatment is carried out at the return bend position, because this solution heat treatment is to bend the cold working stress that produces when being shaped in order to eliminate steel pipe, therefore general only the need handled the less U-shaped gapless stainless steel tube of bending radius, and in order to reduce the electric arc burn rate of contact position, the general temperature of handling is controlled between 1040 ℃ to 1100 ℃, simultaneously during heating and cooling, tube cavity feeds argon gas, to prevent the oxidation of the tube wall thermal treatment zone, the performance of protection steel pipe;
Step 10) is carried out the acid wash passivation processing to the bend part of the U-shaped gapless stainless steel tube after the molten processing of step 9) thermosetting, adopt during this acid wash passivation is handled that concentration of nitric acid is 12%, hydrofluoric acid concentration is 5% mixed liquor, and in temperature is to carry out under 50 ℃ to the 60 ℃ conditions, the oxidation that outer surface produces during with the heat treatment of removing bend part.
In sum, the U-shaped gapless stainless steel tube through adopting above-mentioned technology to make meets the instructions for use of feed-water heater, and has more performance.
In addition; though above-mentioned a plurality of preferred embodiments in the utility model are described; but can not be as protection domain of the present utility model; promptly should be understood that to those skilled in the art; do not breaking away from variation and the modification that to make equivalence under the design spirit of the present utility model to it; therefore, every not breaking away from the equivalence variation of having done under the design spirit of the present utility model and modification, all should think to fall into protection domain of the present utility model.
Claims (3)
1. U-shaped gapless stainless steel tube that feed-water heater is used, it is characterized in that:, interference cold rolling through annular distance pattern tool by mother tube be the U-shaped gapless stainless steel tube of press molding radially, this U-shaped gapless stainless steel tube cross section everywhere all is the ring-type of sealing, and wall thickness is between 0.8 to 2.11 millimeter, external diameter of pipe is between 15.9 to 25.4 millimeters, and the length after described U-shaped pipe launches is between 24 to 30 meters.
2. the U-shaped gapless stainless steel tube of using according to the feed-water heater described in the claim 1, it is characterized in that: the wall thickness of described U-shaped gapless stainless steel tube is 0.9 ± 0.1 millimeter, and diameter is 16 ± 0.1 millimeters, the length after the expansion is between 26 to 28 meters.
3. the U-shaped gapless stainless steel tube of using according to the feed-water heater described in the claim 1, it is characterized in that: described U-shaped gapless stainless steel tube cross section everywhere all is the circular of sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320131577 CN2675286Y (en) | 2003-12-26 | 2003-12-26 | U-shape seamless stainless steel pipe for water heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320131577 CN2675286Y (en) | 2003-12-26 | 2003-12-26 | U-shape seamless stainless steel pipe for water heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2675286Y true CN2675286Y (en) | 2005-02-02 |
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ID=34477503
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320131577 Expired - Lifetime CN2675286Y (en) | 2003-12-26 | 2003-12-26 | U-shape seamless stainless steel pipe for water heating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2675286Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202011051457U1 (en) | 2011-09-16 | 2011-11-04 | Hongwei Jin | Elektroerhitzereinrichtung technology |
-
2003
- 2003-12-26 CN CN 200320131577 patent/CN2675286Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202011051457U1 (en) | 2011-09-16 | 2011-11-04 | Hongwei Jin | Elektroerhitzereinrichtung technology |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20060405 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20081212 Address after: Jiangsu Province, Yixing City Economic Development Zone, Bian Zhuang, zip code: 214203 Patentee after: Jiangsu Yinhuan Steel Tube Co., Ltd. Address before: Jiangsu city of Yixing province Beijiao Bian Zhuang, zip code: 214200 Patentee before: Zhuang Jianxin |
|
| ASS | Succession or assignment of patent right |
Owner name: JIANGSU YINHUAN PRECISION STEEL TUBE CO., LTD. Free format text: FORMER OWNER: ZHUANG JIANXIN Effective date: 20081212 |