CN1554892A - U-shaped seamless stainless steel pipe and its preocessing process - Google Patents
U-shaped seamless stainless steel pipe and its preocessing process Download PDFInfo
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- CN1554892A CN1554892A CNA2003101131007A CN200310113100A CN1554892A CN 1554892 A CN1554892 A CN 1554892A CN A2003101131007 A CNA2003101131007 A CN A2003101131007A CN 200310113100 A CN200310113100 A CN 200310113100A CN 1554892 A CN1554892 A CN 1554892A
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Abstract
The U-shaped seamless stainless steel pipe is used mainly in water heater, and is produced with material pipe and through cold rolling in ring hole mold and radial interference pressing. The U-shaped seamless stainless steel pipe has cross section in closed ring, and has water thickness of 0.8-2.11 mm, outer diameter of 15.9-25.4 mm and expanded length of 24-30 m.
Description
Technical field
The present invention relates to a kind of steel pipe and processing technology thereof, more particularly, relate to a kind of U-shaped gapless stainless steel tube and processing technology thereof that is mainly used in feed water preheater.
Background technique
Fast development along with the in short supply and power industry of electric power, make also fast development of feed water preheater 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 preheater constantly increases, and the Austenitic Stainless Steel U-shaped pipe that is mainly used in feed water preheater 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 welding technique, also the existence because of weld seam in use has certain risk, and the technical requirements to welding is too high, further causes cost high.
The MANUFACTURER desire of part feed water preheater 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 preheater, therefore how to provide a kind of have speciality, thin-walled and bend part be the U-shaped gapless stainless steel tube of semi-circle transition and processing technology thereof be among the present invention the creator grind wound motivation place.
In view of this, creator among the present invention relies on it to be engaged in the experience and the practice of relevant industries for many years, and, design a kind of U-shaped gapless stainless steel tube and processing technology thereof that the thin and bend part of speciality, wall is the semi-circle transition that have finally through concentrating on studies and developing.
Summary of the invention
Main purpose of the present invention is to solve the problem that is not applicable to the U-shaped gapless stainless steel tube of feed water preheater at present.
Another object of the present invention is to solve the problem that does not have to process the U-shaped gapless stainless steel tube that is applicable to feed water preheater at present.
U-shaped gapless stainless steel tube among the present invention 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 circular of sealing or approximate circle ring-type, 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.
The processing technology of U-shaped gapless stainless steel tube among the present invention includes the following step:
1) preparation of mother tube;
2) by cold-rolling equipment with mother tube be cold-rolled to diameter between 32 to 45mm, the intermediate blank pipe of wall thickness between 1.8 to 3mm;
3) utilize cold-drawn or cold-rolling equipment with step 2) in the further cold-drawn of intermediate blank pipe finished or be cold-rolled to diameter between 26 to 27mm, the middle semi-finished product of wall thickness between 1.4 to 1.8mm;
4) middle semi-finished product of finishing in the step 3) is cold-rolled to wall thickness between 0.8 to 2.11 millimeter via annular distance pattern tool and cold-rolling equipment, external diameter of pipe is between 15.9 to 25.4 millimeters, the finished-product straight pipe of length between 24 to 30 meters, the specific 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;
6) utilize bent pipe mold with in the step 5) through deoil and cleaning after finished-product straight pipe curve speciality, thin-walled, seamless U-shaped Stainless Steel Tube;
7) bend part to the U-shaped gapless stainless steel tube after handling through step 6) carries out solution heat treatment.
In addition, utilize bent pipe mold in the described step 6) and adopt interference radially pressurization make through step 5) deoil and cleaning after finished-product straight pipe curve the U-shaped pipe, and be the semi-circle transition at bend part.
In addition, to deoil through described step 5) and cleaning after finished-product straight pipe carry out the molten processing of shielding gas atmosphere thermosetting, the molten processing of this shielding gas atmosphere thermosetting is adopted ammonia to decompose back nitrogen and is approximately 1: 3 mixed gas with the hydrogen volume ratio.
In addition, in the described step 5) deoil and cleaning is to adopt hairbrush and fibre cloth, and the repeatedly wiping technology that advances hairbrush and fibre cloth to pass finished-product straight pipe inside by means of the pressure of high pressure water.
In addition, described U type gapless stainless steel tube carries out acid wash passivation to elbow part after step 7) handles, and adopts promptly that concentration of nitric acid is about 12%, hydrofluoric acid concentration be about 5% mixed solution in temperature is that 50 ℃ to 60 ℃ conditions are carried out acid wash passivation and handled.
In addition, in described step 2) with step 3) after all to described intermediate blank pipe, middle straight base pipe deoil, the molten processing of thermosetting and pickling processes.
In addition, in described step 5), also can carry out solution heat treatment to finished-product straight pipe.
U-shaped gapless stainless steel tube among the present invention is mainly used in the feed water preheater 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-circle transition, not only improve pipe quality, and met the usage requirement of feed water preheater fully.
The present invention 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 inner and outer surface is no more than 10.7mg/m
2Etc. advantage.
Description of drawings
Fig. 1 is the process flow diagram of U-shaped gapless stainless steel tube among the present invention;
Fig. 2 is the structural representation of U-shaped gapless stainless steel tube among the present invention;
Fig. 3 is the structural representation of U-shaped gapless stainless steel tube annular distance pattern tool in the cold-rolling process process among the present invention;
Fig. 4 is the cross-sectional schematic of U-shaped gapless stainless steel tube annular distance pattern tool in the cold-rolling process process among the present invention;
Fig. 5 is the seamless structural representation that shows rust steel pipe bend pipe mould in the bent tube technique process of U-shaped among the present invention;
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 among the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment among the present invention is described in further detail.
As shown in Figure 2, U-shaped gapless stainless steel tube 1 is mainly used in feed water preheater among the present invention, 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 adopt week more accurate technology can make the back U type gapless stainless steel tube that is shaped wall thickness between 0.9 to 1.8 millimeter, external diameter of pipe is between 16 to 19 millimeters, 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 among the present invention, 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 specific 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 fibre cloth, and advance hairbrush and fibre cloth to pass finished-product straight pipe inside by means of the high pressure water 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 inner tube wall;
8) in the step 7) through deoil and cleaning after finished-product straight pipe carry out the molten processing of shielding gas atmosphere thermosetting, the molten processing of this shielding gas atmosphere thermosetting is to adopt ammonia to decompose back nitrogen to be approximately 1: 3 mixed gas with the hydrogen volume ratio, has guaranteed the photometric brightness of steel pipe inner and outer surface;
9) utilize bent pipe mold and adopt interference radially pressurization the finished-product straight pipe after the shielding gas 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-type heating plant (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 contacting point, 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 tube wall heating-up 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 solution, 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 outlet port 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 circle radius 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 160.1mm, thickness are 0.9 ± 0.1mm, the finished-product straight pipe of length between 24 meters to 30 meters, and the specific 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 fibre cloth, and advance hairbrush and fibre cloth to pass finished-product straight pipe inside by means of the high pressure water 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 inner tube wall;
6) to deoil through step 5) and cleaning after finished-product straight pipe carry out the molten processing of shielding gas atmosphere thermosetting, the molten processing of this shielding gas atmosphere thermosetting is to adopt ammonia to decompose back nitrogen to be approximately 1: 3 mixed gas with the hydrogen volume ratio, has guaranteed the photometric brightness of steel pipe inner and outer surface;
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-type heating plant 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 contacting point; 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 tube wall heating-up 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 specific 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 fibre cloth, and advance hairbrush and fibre cloth to pass finished-product straight pipe inside by means of the high pressure water 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 inner tube 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-type heating plant 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 contacting point, 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 tube wall heating-up 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 solution, 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 usage requirement of feed water preheater, and has more performance.
In addition; though above-mentioned a plurality of preferred embodiments among the present invention are described; but can not be as protection scope of the present invention; 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 invention to it; therefore, every not breaking away from the equivalence variation of having done under the design spirit of the present invention and modification, all should think to fall into protection scope of the present invention.
Claims (12)
1. U-shaped gapless stainless steel tube, 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 circular of sealing or approximate circle ring-type, 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. according to the U-shaped gapless stainless steel tube 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, and the length after the expansion is between 26 to 28 meters.
3. the processing technology of a U-shaped gapless stainless steel tube includes the following step:
1) preparation of mother tube;
2) by cold-rolling equipment with mother tube be cold-rolled to diameter between 32 to 45mm, the intermediate blank pipe of wall thickness between 1.8 to 3mm;
3) utilize cold-drawn or cold-rolling equipment with step 2) in the further cold-drawn of intermediate blank pipe finished or be cold-rolled to diameter between 26 to 27mm, the middle semi-finished product of wall thickness between 1.4 to 1.8mm;
4) with the middle semi-finished product direct cold rolling finished in the step 3) to wall thickness between 0.8 to 2.11 millimeter, external diameter of pipe is between 15.9 to 25.4 millimeters, the finished-product straight pipe of length between 24 to 30 meters, the specific 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;
6) utilize bent pipe mold with in the step 5) through deoiling and the finished-product straight pipe of cleaning curves speciality, thin-walled, seamless U-shaped Stainless Steel Tube;
7) bend part to the U-shaped gapless stainless steel tube after handling through step 6) carries out solution heat treatment.
4. according to the processing technology of the U-shaped gapless stainless steel tube described in the claim 3, it is characterized in that: utilize bent pipe mold in the described step 6) and adopt interference radially pressurization make through step 5) deoil and cleaning after finished-product straight pipe curve the U-shaped pipe, and be the semi-circle transition at bend part.
5. according to the processing technology of the U-shaped gapless stainless steel tube described in the claim 3, it is characterized in that: in the described step 4) by annular distance pattern tool and cold-rolling equipment is repeatedly cold rolling repeatedly forms.
6. according to the processing technology of any described U-shaped gapless stainless steel tube in the claim 3 to 5; it is characterized in that: to deoil through described step 5) and cleaning after finished-product straight pipe carry out the molten processing of shielding gas atmosphere thermosetting, the molten processing of this shielding gas atmosphere thermosetting is adopted ammonia to decompose back nitrogen and is approximately 1: 3 mixed gas with the hydrogen volume ratio.
7. according to the processing technology of any described U-shaped gapless stainless steel tube in the claim 3 to 5, it is characterized in that: in the described step 5) deoil and cleaning is to adopt hairbrush and fibre cloth, and the repeatedly wiping technology that advances hairbrush and fibre cloth to pass finished-product straight pipe inside by means of the pressure of high pressure water.
8. according to the processing technology of the U-shaped gapless stainless steel tube described in the claim 7, it is characterized in that: the pressure of described high pressure water is between 1.1 to 1.6MPa.
9. according to the processing technology of any described U-shaped gapless stainless steel tube in the claim 3 to 5, it is characterized in that: described U type gapless stainless steel tube carries out acid wash passivation to bend part after step 7) handles, and adopts promptly that concentration of nitric acid is 12%, hydrofluoric acid concentration be 5% mixed solution in temperature is that 50 ℃ to 60 ℃ degree conditions are carried out acid wash passivation and handled.
10. a feed water preheater is characterized in that: used the U-shaped gapless stainless steel tube described in the claim 1.
11. a feed water preheater is characterized in that: used and utilized the U-shaped gapless stainless steel tube that technology makes described in the claim 3.
12. the U-shaped gapless stainless steel tube according to described in the claim 1 is characterized in that: described U-shaped gapless stainless steel tube is used for the heat transmission equipment of industries such as petrochemical industry, chemical industry.
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| CN 200310113100 CN1249368C (en) | 2003-12-26 | 2003-12-26 | U-shaped seamless stainless steel pipe and its preocessing process |
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| CN 200310113100 CN1249368C (en) | 2003-12-26 | 2003-12-26 | U-shaped seamless stainless steel pipe and its preocessing process |
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| CN1249368C CN1249368C (en) | 2006-04-05 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100374241C (en) * | 2005-04-18 | 2008-03-12 | 宝钢集团上海五钢有限公司 | OOCr22Ni5MO3N high-nitrogen steel seamless steel pipe manufacturing method |
| CN101372020A (en) * | 2008-10-06 | 2009-02-25 | 江苏银环精密钢管股份有限公司 | Method for preparing U-shaped seamless steel pipe of high-pressure feedwater heater |
| CN102690939A (en) * | 2011-03-25 | 2012-09-26 | 上海凯科管业有限公司 | Production process of stainless steel seamless bend |
| CN103551812A (en) * | 2013-11-11 | 2014-02-05 | 国家电网公司 | Cold bending processing method for austenitic stainless steel |
| CN104646932A (en) * | 2013-11-16 | 2015-05-27 | 无锡大金高精度冷拔钢管有限公司 | Manufacturing method for high-precision cold-drawing welded pipe |
| CN111451315A (en) * | 2020-06-01 | 2020-07-28 | 江苏银环精密钢管有限公司 | Processing technology of U-shaped seamless stainless steel pipe and stainless steel pipe |
-
2003
- 2003-12-26 CN CN 200310113100 patent/CN1249368C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100374241C (en) * | 2005-04-18 | 2008-03-12 | 宝钢集团上海五钢有限公司 | OOCr22Ni5MO3N high-nitrogen steel seamless steel pipe manufacturing method |
| CN101372020A (en) * | 2008-10-06 | 2009-02-25 | 江苏银环精密钢管股份有限公司 | Method for preparing U-shaped seamless steel pipe of high-pressure feedwater heater |
| CN102690939A (en) * | 2011-03-25 | 2012-09-26 | 上海凯科管业有限公司 | Production process of stainless steel seamless bend |
| CN102690939B (en) * | 2011-03-25 | 2014-02-26 | 上海凯科管业有限公司 | Production process of stainless steel seamless bend |
| CN103551812A (en) * | 2013-11-11 | 2014-02-05 | 国家电网公司 | Cold bending processing method for austenitic stainless steel |
| CN104646932A (en) * | 2013-11-16 | 2015-05-27 | 无锡大金高精度冷拔钢管有限公司 | Manufacturing method for high-precision cold-drawing welded pipe |
| CN111451315A (en) * | 2020-06-01 | 2020-07-28 | 江苏银环精密钢管有限公司 | Processing technology of U-shaped seamless stainless steel pipe and stainless steel pipe |
| CN111451315B (en) * | 2020-06-01 | 2021-04-09 | 江苏银环精密钢管有限公司 | Processing technology of U-shaped seamless stainless steel pipe and stainless steel pipe |
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| Publication number | Publication date |
|---|---|
| CN1249368C (en) | 2006-04-05 |
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