CN104259242B - Technology for manufacturing cold-drawing seamless tube for oxygen bottle - Google Patents
Technology for manufacturing cold-drawing seamless tube for oxygen bottle Download PDFInfo
- Publication number
- CN104259242B CN104259242B CN201410391157.1A CN201410391157A CN104259242B CN 104259242 B CN104259242 B CN 104259242B CN 201410391157 A CN201410391157 A CN 201410391157A CN 104259242 B CN104259242 B CN 104259242B
- Authority
- CN
- China
- Prior art keywords
- tube
- steel pipe
- cold
- steel
- pickling
- 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.)
- Expired - Fee Related
Links
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
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- 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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to a technology for manufacturing a cold-drawing seamless tube for an oxygen bottle. According to the technology for manufacturing the cold-drawing seamless tube for the oxygen bottle, a hot-rolling seamless tube made of 30 CrMo and with the specification of 140*4.5 is selected, factory inspection, acid pickling lubricating treatment and two times of cold drawing are carried out on the hot-rolling seamless tube, and therefore a finished product with the specification of 108*2.8 is obtained; and finishing and inspection are carried out on the steel tube, and the finished product steel tube is obtained. The high-quality hot-rolling seamless tube (the specification of phi 114*4.5, and the material of 30 CrMo) is adopted, and the cold-drawing finished product tube with the specification of phi 108*2.8 is obtained through two times of cold drawing. The tube has the advantages of being high in surface quality, high in geometric dimensioning precision, excellent in mechanical property and the like; the performance index of the tube comprehensively meets the requirement of GB18248-2008 the seamless steel tube for the oxygen bottle and the requirement of the user-signed technical protocol RDZT-001-2010 the cold-drawing seamless tube for a gas bottle/inner container; the quality is reliable, the good user reputation is achieved, and the technology has the wide market prospect.
Description
Technical field
The invention belongs to Metallic Materials Held In Shanghai technical field, is related to manufacture the oxygen cylinder dived under water with big diameter-wall-rate, especially
Which is a kind of oxygen cylinder cold-drawing seamless pipe manufacturing process.
Background technology
With the winged development of science and technology, diving operation is more and more, and the demand of the oxygen cylinder dived under water gradually increases.Mesh
Before, the oxygen cylinder of diving mostly adopts substitute, does not have special diving oxygen cylinder.As diving oxygen cylinder is special
Articles for use, needs bear higher pressure, therefore it is required that the surface quality of diving oxygen cylinder is high, dimensional accuracy is good, combination property
It is excellent.But the oxygen cylinder for substituting still adopts existing medical oxygen cylinder, there is larger security risk.
By retrieval, not yet find and identical patent document of the present invention.
The content of the invention
It is an object of the invention in place of overcoming the deficiencies in the prior art, there is provided a kind of surface quality is good, dimensional accuracy is high,
The oxygen cylinder of high comprehensive performance cold-drawing seamless pipe manufacturing process.
The purpose of the present invention is achieved through the following technical solutions：
A kind of oxygen cylinder cold-drawing seamless pipe manufacturing process, the selection material of the cold-drawing seamless pipe be 30CrMo, 140 ×
The hot seamless tube of 4.5 specifications, through incoming test, pickling lubricated and two passage cold-drawns to trimmed size 108 × 2.8,
Qualified fished pipe is obtained through steel-tube finishing, steel pipe detection again, specific processing step is：
(1) mother tube incoming test：
(2) pickling lubricating process：
(1) qualified to incoming test hot rolling mother tube carries out pickling：Using chlorohydric acid pickling, concentration 28%-30%, 40 DEG C-
45 DEG C, soak time 3-4 hour, by hot rolling mother tube surfaces externally and internally oxide skin all acid wash clean, entering clean water tank after pickling will
The dirt for remaining in surface is cleaned；
(2) phosphatization：Phosphating Solution is configured to total acidity 20-25 point, free acid 2.0-2.5 points, 40 DEG C -45 DEG C of temperature, immersion
Minute time 30-40, the steel tube surface after phosphatization form the jade-green phosphating coat of a thin layer；
(3) saponification：Saponification liquor is configured to 50 g/l of aliphatic acid ＞, 80 DEG C -85 DEG C of temperature, soak time 6-8 minute, saponification
Steel tube surface afterwards has one layer of uniform saponification film；
(3) cold-drawing technology：
(1) the mother tube for pickling having been lubricated carries out twice time draw on 100 tons of hydraulic pressure cold drawing machines：
The first passages of a：Φ 113 × 3.5 is pulled out by Φ 140 × 4.5；
Slubbing external mold size is Φ 110.5- Φ 111.83mm, internal model：101.56-103.21mm, the first passage is pulled out
Return to pretreatment procedure in product pipe and enter saponification liquor saponification process again, that what is handled well returns to 100 tons in product pipe and pulls out
The second passage draw is carried out at machine；
The second passages of b：108 × 2.8 trimmed sizes of Φ are pulled out by Φ 113 × 3.5；
The external mold size Φ 107.4- Φ 108.81mm in two roads, internal model：101.56-103.21mm；
(2) during draw, the control of inside and outside die clearance amount will be adjusted flexibly, and the wall thickness control of final finished is in 2.80-
3.31mm, external diameter are controlled in 107.46-108.54mm.
(4) steel-tube finishing：
(1) will be in the enterprising pedestrian's work aligning of gag straightener to the steel pipe of trimmed size, it is ensured that the flexibility of steel pipe≤
1.5mm/m, total length flexibility are not more than the 0.12% of total length；
(2) artificial surface inspection is carried out to aligning qualified steel pipe, survey wall thickness and external diameter；Artificial ultrasound wave inspection, to flaw detection
Mark to be carried out in unqualified and disqualified upon inspection position；
(3) crop, back-end crop being carried out to steel pipe on band sawing machine, cutting off tagged unqualified position, 4m is more than to length
Normal delivery, be cut into multiple length on request less than 4m；
(4) the steel pipe end surface after cutting is vertical with steel pipe axis.The burr of port will cut off totally；
(5) steel pipe detection.
And, the step of the mother tube incoming test it is：
(1) visual inspection steel pipe inside and outside surface quality：Surface be not allow for crackle, fold, scab, absciss layer, these defects must
Jing is removed, and the wall thickness at removing is required not less than steel pipe minimum wall thickness (MINI W.)；
(2) thickness of steel pipe and outside diameter ovality, flexibility 15 are inspected by random samples；Wall thickness range 10%- 15%S, 4.05-
5.17mm, external diameter ± 1%D, 112.86-115.14mm；
The 70% of ovality≤outer diameter tolerance；
Flexibility≤1.5m/m；
(3) extracting 15 steel pipes per stove carries out ultrasonic examination, performs by GB/T5777-2008L2 levels standard；
(4) extracting 1 sample per stove carries out chemical composition analysis, and randomly selecting 2 samples carries out nonmetal inclusion quality testing
Test.
Advantages of the present invention and good effect are：
1st, the present invention adopts the hot seamless tube (114 × 4.5 specification materials of Φ are for 30CrMo) of high-quality, two passage cold-drawns of Jing
Obtain 108 × 2.8 specification cold-drawn production tubes of Φ.The product has surface quality good, and geometric accuracy is high, good mechanical performance
The features such as property indices meet GB18248-2008 comprehensively《Seamless steel pipe for gas cylinder》And the technical protocol signed with user
RDZT-001-2010《Gas cylinder/inner bag solid drawn tube》Require, reliable in quality, by user's favorable comment, with wide city
Field prospect.
2nd, the surface quality of product of the present invention is good, dimensional accuracy is high, high comprehensive performance, with big diameter-wall-rate, specially
For manufacturing the oxygen cylinder of diving, be suitable to manufacture diving oxygen cylinder for export, product adds up to produce nearly kiloton, quality compared with
User's favorable comment is subject to stably.
Specific embodiment
With reference to specific embodiment, the invention will be further described, and following examples are descriptive, is not limit
Qualitatively, it is impossible to which protection scope of the present invention is limited with this.
A kind of oxygen cylinder cold-drawing seamless pipe manufacturing process, the selection material of the cold-drawing seamless pipe is 30CrMo, 140 ×
The hot seamless tube of 4.5 specifications, through incoming test, pickling lubricated and two passage cold-drawns to trimmed size 108 × 2.8,
Qualified fished pipe is obtained through steel-tube finishing, steel pipe detection again.
Specifically processing step is：
First, mother tube incoming test
(1) visual inspection steel pipe inside and outside surface quality：Surface be not allow for crackle, fold, scab, absciss layer, these defects must
Jing is removed, and the wall thickness at removing is required not less than steel pipe minimum wall thickness (MINI W.)；
(2) thickness of steel pipe and outside diameter ovality, flexibility 15 are inspected by random samples；Wall thickness range (10%- 15%S), 4.05-
5.17mm, external diameter (± 1%D), 112.86-115.14mm；
Ovality (the 70% of≤outer diameter tolerance), i.e. ,≤1.43mm；
Flexibility≤1.5m/m.
(3) extracting 15 steel pipes per stove carries out ultrasonic examination, performs by GB/T5777-2008L2 levels standard；
(4) extracting 1 sample per stove carries out chemical composition analysis, and randomly selecting 2 samples carries out nonmetal inclusion quality testing
Test.
2nd, pickling lubricating process
(1) qualified to incoming test hot rolling mother tube carries out pickling：Using chlorohydric acid pickling, concentration 28%-30%, 40 DEG C-
45 DEG C, soak time 3-4 hour, by hot rolling mother tube surfaces externally and internally oxide skin all acid wash clean, entering clean water tank after pickling will
The dirt for remaining in surface is cleaned；
(2) phosphatization：Phosphating Solution is configured to total acidity 20-25 point, free acid 2.0-2.5 points, 40 DEG C -45 DEG C of temperature, immersion
Minute time 30-40, the steel tube surface after phosphatization form the jade-green phosphating coat of a thin layer；
(3) saponification：Saponification liquor is configured to 50 g/l of aliphatic acid ＞, 80 DEG C -85 DEG C of temperature, soak time 6-8 minute, saponification
Steel tube surface afterwards has one layer of uniform saponification film.
3rd, cold-drawing technology
(1) the mother tube for pickling having been lubricated carries out twice time draw on 100 tons of hydraulic pressure cold drawing machines：
The first passages of a：Φ 113 × 3.5 is pulled out by Φ 140 × 4.5；
Slubbing external mold size is Φ 110.5- Φ 111.83mm, internal model：101.56-103.21mm, the first passage is pulled out
Return to pretreatment procedure in product pipe and enter saponification liquor saponification process again, that what is handled well returns to 100 tons in product pipe and pulls out
The second passage draw is carried out at machine；
The second passages of b：108 × 2.8 trimmed sizes of Φ are pulled out by Φ 113 × 3.5；
The external mold size Φ 107.4- Φ 108.81mm in two roads, internal model：101.56-103.21mm, notes interior during draw
Outer mould surface is smooth, without scratching, foreign；
(2) during draw, the control of inside and outside die clearance amount will be adjusted flexibly, and the wall thickness control of final finished is in 2.80-
3.31mm, external diameter are controlled in 107.46-108.54mm.
4th, steel-tube finishing
(1) will be in the enterprising pedestrian's work aligning of gag straightener to the steel pipe of trimmed size, it is ensured that the flexibility of steel pipe≤
1.5mm/m, total length flexibility are not more than the 0.12% of total length, firmly appropriate during aligning, prevent steel pipe from rectifying flat；
(2) artificial surface inspection is carried out to aligning qualified steel pipe, survey wall thickness and external diameter；Artificial ultrasound wave inspection, to flaw detection
Mark to be carried out in unqualified and disqualified upon inspection position；
(3) crop, back-end crop being carried out to steel pipe on band sawing machine, cutting off tagged unqualified position, 4m is more than to length
Normal delivery, be cut into multiple length on request less than 4m；
(4) the steel pipe end surface after cutting is vertical with steel pipe axis.The burr of port will cut off totally.
5th, steel pipe detection
(1) according to GB18248-2008《Seamless steel pipe for gas cylinder》With technical protocol RDZT-001-2010, by steel pipe
Carry out external diameter, wall thickness, flexibility and surface quality testing.Guarantee that every steel pipe all meets technical protocol and national standard is required.
(2) according to GB/T241-2008《The ultrasonic flaw detecting of seamless steel pipe method of inspection》L2 levels carry out ultrasound by propping up to steel pipe
Wave inspection, it is ensured that steel pipe all meets the requirements.
(3) according to GB/T7735-2004《The Steel Pipe Eddy Detection method of inspection》Grade A, carries out vortex spy by steel pipe
Wound, it is ensured that steel pipe meets the requirements.
(4) the physicochemical property inspection of steel pipe
According to the chemical composition of corresponding technical standard and technical protocol to steel pipe, mechanical property, non-metallic inclusion are entered
Inspection is gone, assay is as follows：
Steel pipe chemical composition (mass fraction) %
| Classification | C | Si | Mu | P | S | Cr | Mo | Ni | Cu |
| Mother tube | 0.28 | 0.26 | 0.55 | 0.004 | 0.002 | 0.94 | 0.16 | 0.06 | 0.08 |
| Production tube | 0.31 | 0.27 | 0.57 | 0.003 | 0.002 | 0.96 | 0.17 | 0.06 | 0.08 |
| Protocol requirement | 0.26-0.34 | 0.17-0.35 | 0.40-0.70 | ≤0.020 | ≤0.020 | 0.90-1.10 | 0.15-0.25 | ≤0.18 | ≤0.20 |
In the present invention described in upper table, in chemical composition, S, P content and residual elements (Ni, Cu) equal size are all much low
Require in technical protocol, this is highly beneficial to the combination property for ensureing steel pipe.
Steel pipe sample is quenched, the vertical mixing coefficient such as following table after temper
Steel pipe vertical mixing coefficient
The Technology for Heating Processing that sample blanks is adopted for：
880 DEG C of insulations, 40 minutes oil quenchings, 610 DEG C of insulations, 60 minutes air coolings.
The examination of nonmetallic inclusion result of steel pipe
Claims (1)
1. a kind of oxygen cylinder cold-drawing seamless pipe manufacturing process, it is characterised in that：The selection material of the cold-drawing seamless pipe is
The hot seamless tube of 30CrMo, Φ 140 × 4.5mm specifications, through incoming test, pickling lubricated and two passage cold-drawns to into
Product 108 × 2.8mm of specification Φ, then qualified fished pipe, specific processing step is obtained through steel-tube finishing, steel pipe detection
For：
(1) mother tube incoming test：
(2) pickling lubricating process：
(1) qualified to incoming test hot rolling mother tube carries out pickling：Using chlorohydric acid pickling, concentration 28%-30%, 40 DEG C -45
DEG C, soak time 3-4 hour, by hot rolling mother tube surfaces externally and internally oxide skin all acid wash clean, entering clean water tank after pickling will be residual
The dirt for staying in surface is cleaned；
(2) phosphatization：Phosphating Solution is configured to total acidity 20-25 point, free acid 2.0-2.5 points, 40 DEG C -45 DEG C of temperature, soak time
30-40 minutes, the steel tube surface after phosphatization form the jade-green phosphating coat of a thin layer；
(3) saponification：Saponification liquor is configured to 50 g/l of aliphatic acid ＞, 80 DEG C -85 DEG C of temperature, and soak time 6-8 minute, after saponification
Steel tube surface has one layer of uniform saponification film；
(3) cold-drawing technology：
(1) the mother tube for pickling having been lubricated carries out twice time draw on 100 tons of hydraulic pressure cold drawing machines：
The first passages of a：113 × 3.5mm of Φ are pulled out by 140 × 4.5mm of Φ；
Slubbing external mold size is Φ 110.5- Φ 111.83mm, internal model：Φ 101.56- Φ 103.21mm, the first passage are pulled out
Product pipe return to pretreatment procedure and enter saponification liquor saponification process again, the product pipe handled well returns to 100 tons of hydraulic colds
The second passage draw is carried out at drawing machine；
The second passages of b：Φ 108 × 2.8mm trimmed sizes are pulled out by 113 × 3.5mm of Φ；
The external mold size Φ 107.4- Φ 108.81mm in two roads, internal model：Φ101.56-Φ103.21mm；
(2) during draw, the control of inside and outside die clearance amount will be adjusted flexibly, the wall thickness control of final finished in 2.80-3.31mm, outward
Footpath is controlled in Φ 107.46- Φ 108.54mm；
(4) steel-tube finishing：
(1) will be in the enterprising pedestrian's work aligning of gag straightener to the steel pipe of trimmed size, it is ensured that the flexibility≤1.5mm/m of steel pipe,
Total length flexibility is not more than the 0.12% of total length；
(2) artificial surface inspection is carried out to aligning qualified steel pipe, survey wall thickness and external diameter；Artificial ultrasound wave inspection, does not conform to flaw detection
Mark will be carried out in lattice and disqualified upon inspection position；
(3) crop, back-end crop is carried out to steel pipe on band sawing machine, cut off tagged unqualified position, to length more than 4m just
Often deliver goods, be cut into multiple length on request less than 4m；
(4) the steel pipe end surface after cutting is vertical with steel pipe axis；The burr of port will cut off totally；
(5) steel pipe detection；
The step of mother tube incoming test is：
(1) visual inspection steel pipe inside and outside surface quality：Surface be not allow for crackle, fold, scab, absciss layer, these defects must be clear
Remove, the wall thickness at removing is required not less than steel pipe minimum wall thickness (MINI W.)；
(2) 15 thickness of steel pipe and outside diameter ovality, flexibility are inspected by random samples；Wall thickness range 10%- 15%S：4.05-5.175mm,
External diameter is ± 1%D：138.6-141.4mm；
The 70% of ovality≤outer diameter tolerance；
Flexibility≤1.5mm/m；
(3) extracting 15 steel pipes per stove carries out ultrasonic examination, performs by GB/T5777-2008L2 levels standard；
(4) extracting 1 sample per stove carries out chemical composition analysis, and randomly selecting 2 samples carries out the examination of nonmetallic inclusion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410391157.1A CN104259242B (en) | 2014-08-11 | 2014-08-11 | Technology for manufacturing cold-drawing seamless tube for oxygen bottle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410391157.1A CN104259242B (en) | 2014-08-11 | 2014-08-11 | Technology for manufacturing cold-drawing seamless tube for oxygen bottle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104259242A CN104259242A (en) | 2015-01-07 |
| CN104259242B true CN104259242B (en) | 2017-03-22 |
Family
ID=52150887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410391157.1A Expired - Fee Related CN104259242B (en) | 2014-08-11 | 2014-08-11 | Technology for manufacturing cold-drawing seamless tube for oxygen bottle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104259242B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109759478B (en) * | 2019-01-22 | 2020-10-27 | 德新钢管（中国）有限公司 | Manufacturing method of seamless steel tube for large-volume gas cylinder |
| CN111495984A (en) * | 2020-05-10 | 2020-08-07 | 江苏联峰实业有限公司 | Production method of reducing round bar rolled steel |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02251313A (en) * | 1989-03-23 | 1990-10-09 | Kawasaki Steel Corp | Manufacture of high damping steel pipe |
| DE4105701A1 (en) * | 1990-03-08 | 1991-09-12 | Mannesmann Ag | METHOD FOR PRODUCING A METAL, THICK-WALLED HIGH-PRESSURE PIPE |
| JPH08174051A (en) * | 1994-12-26 | 1996-07-09 | Sumitomo Metal Ind Ltd | Method for producing double tube with excellent interfacial bondability |
| CN101885009A (en) * | 2010-08-06 | 2010-11-17 | 天津润德中天钢管有限公司 | Manufacturing method of cold-drawing seamless steel tube for oxygen supplying bottles |
| CN101885010A (en) * | 2010-08-06 | 2010-11-17 | 天津润德中天钢管有限公司 | Method for manufacturing cold-drawing gas cylinder tube for medical oxygen cylinder |
| CN101890441A (en) * | 2010-08-06 | 2010-11-24 | 天津润德中天钢管有限公司 | Method for manufacturing cold-drawing seamless tube used for diving oxygen cylinder |
| CN101890442A (en) * | 2010-08-06 | 2010-11-24 | 天津润德中天钢管有限公司 | Manufacturing method for cold drawn gas bottle pipe for inert gas |
| CN101890440A (en) * | 2010-08-06 | 2010-11-24 | 天津润德中天钢管有限公司 | Method for manufacturing cold-drawing seamless steel tube for firefighting bottle |
| JP5333401B2 (en) * | 2010-10-04 | 2013-11-06 | 新日鐵住金株式会社 | Metal double pipe manufacturing method |
-
2014
- 2014-08-11 CN CN201410391157.1A patent/CN104259242B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN104259242A (en) | 2015-01-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102632094B (en) | Method for improving surface quality of titanium and titanium alloy pipes and drawing die | |
| CN106938285B (en) | A kind of manufacturing method of stainless steel square tube | |
| CN103276297B (en) | A kind of self-joining type high strength cord is cored the manufacture method of drilling rod weldless steel tube | |
| CN110052792B (en) | Manufacturing method of cylinder barrel for hydraulic cylinder | |
| CN102500619B (en) | Seamless titanium welded pipe and manufacturing method thereof | |
| CN104259242B (en) | Technology for manufacturing cold-drawing seamless tube for oxygen bottle | |
| CN102233365A (en) | Manufacturing process of small-diameter seamless steel tubes | |
| CN103624095B (en) | A kind of production technology of fine diamond turning | |
| CN103624102B (en) | The processing method of cold drawing oil earthen pipe | |
| CN101885009A (en) | Manufacturing method of cold-drawing seamless steel tube for oxygen supplying bottles | |
| CN104624713B (en) | A kind of preparation method of precision titanium alloy thin-walled seamless tube | |
| CN115647106A (en) | A kind of production method of small-diameter thick-walled titanium alloy seamless pipe | |
| CN101885010A (en) | Method for manufacturing cold-drawing gas cylinder tube for medical oxygen cylinder | |
| CN103934304B (en) | A kind of forming method of the accurate small-diameter thick-walled high temperature alloy pipes of aviation | |
| CN101890441A (en) | Method for manufacturing cold-drawing seamless tube used for diving oxygen cylinder | |
| CN108517478A (en) | A kind of manufacturing process of the small-bore accurate pipe of 718 alloy | |
| CN101786112A (en) | Manufacturing method of gas cylinder steel tube for long-tube trailer | |
| CN105382499A (en) | Precise stainless steel bright annealing pipe production technology | |
| CN104438429B (en) | A kind of forming method that does not wait the special-shaped stainless-steel pipe of wall reducing | |
| CN104107845A (en) | Production technology of stainless steel pipe | |
| CN104148440A (en) | Process for manufacturing cold-drawing seamless tube for large-volume gas cylinder | |
| CN101890440A (en) | Method for manufacturing cold-drawing seamless steel tube for firefighting bottle | |
| CN104007177A (en) | Method for detecting microporous defect at heart part of cold-drawn seamless steel tube | |
| CN103543154A (en) | Method for judging defect formation process of cold-drawn steel pipe | |
| CN114210760A (en) | A kind of smoke pipe manufacturing process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170322 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |