CN104492850A - Production method of high-finish steel tube - Google Patents
Production method of high-finish steel tube Download PDFInfo
- Publication number
- CN104492850A CN104492850A CN201410720037.1A CN201410720037A CN104492850A CN 104492850 A CN104492850 A CN 104492850A CN 201410720037 A CN201410720037 A CN 201410720037A CN 104492850 A CN104492850 A CN 104492850A
- Authority
- CN
- China
- Prior art keywords
- steel tube
- production method
- adjustment
- heating
- cold
- 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.)
- Granted
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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a production method of a high-finish steel tube. A 38*3mm round billet used in the production method is made of 20# steel. The production method comprises the following steps: heating billet: heating the round billet (phi 50mm) which passes the inspection in an annular heating furnace at 1200 DEG C+/-10 DEG C, holding the temperature for 50+/-5min and tapping; punching: selecting a mandrel plug (phi 50mm) and an ejector rod ((phi 38mm), adjusting the distance of a roller of a puncher to be 40mm, the spacing of guide plates to be 48mm, the extend distance of the mandrel plug to be 31mm and rolling reduction to be 16% and adjusting other parameters, then punching, wherein the punched capillaries have the specification of phi 52*4mm. The production method has the advantages that the surface quality of the steel tube is guaranteed; the surface of the produced steel tube is smooth and high in finish and is identical to the surface of a bright steel tube without being subjected to oxidization thermal treatment and moreover the property of the steel tube is not affected; in addition, the production cost is reduced greatly.
Description
Technical field
The present invention relates to steel pipe's production field, specifically belong to a kind of production method of best bright finish steel pipe.
Background technology
Along with the development of modern technologies, more and more higher to the surface quality requirements of steel pipe.Particularly some steamless steel pipe for heat exchangers, propose very high requirement to steel tube surface fineness.After traditional solid drawn tube finished product heat treatment, oxidation is serious.And adopting non-oxidizing bright heat treatment, equipment cost is high, technical sophistication.
Summary of the invention
The object of this invention is to provide a kind of production method of best bright finish steel pipe, solve and do not using under the heat treated condition of non-oxidizing bright, make steel tube surface reach the requirement of best bright finish.Neither increase cost, reach the instructions for use of steel pipe simultaneously.
Technical scheme of the present invention is as follows:
A production method for best bright finish steel pipe, select material to be No. 20 steel, be of a size of the circular pipe blank of 38 × 3mm, include following operating procedure:
1, heating of pipe blank: φ 50mm circular pipe blank is through after the assay was approved, and circular pipe blank is sent into rotary heating furnace heating, heating-up temperature is 1200 DEG C ± 10 DEG C, is incubated after 50 ± 5 minutes and taps;
2, bore a hole: select φ 40mm top, φ 38mm push rod, adjustment piercer roll distance is the laggard eleven punch 11s of parameter such as 40mm, guide plate spacing 48mm, top head front-extending quantity 31mm, drafts 16%, and pierced shell is φ 52 × 4mm;
3, pickling, phosphatization, saponification: in adjustment pickle, sulfuric acid concentration is between 9% ~ 15%, Fe
2+≤ 200g/L, pickle temperature remains between 30 DEG C ~ 65 DEG C, by the pickling of φ 52 × 4mm hollow billet, cylinder is played after soaking 15min, rinse well with clear water, in adjustment Phosphating Solution, total acidity is between 16mol/L ~ 28mol/L, free acid is between 0.1mol/L ~ 1.0mol/L, Phosphating Solution temperature keeps 50 DEG C ~ 70 DEG C, by hollow billet phosphatization clean for pickling afterflush, cylinder is played after phosphating time 10 ~ 15min, rinse with clear water again, content of fatty acid>=1.0BN in adjustment saponification liquor, temperature is between 60 DEG C ~ 80 DEG C, by the hollow billet saponification after phosphatization, cylinder is played after saponification time 5min ~ 8min,
4, cold-drawn: select the external mold of φ 38mm and the internal mold of φ 32mm, carry out draw at the Drawing Force being no less than 36 tons, draw goes out φ 38 × 3mm hollow forging;
5, heat treatment: the normalized treatment of the φ 38 × 3mm hollow forging after cold-drawn being carried out 900 DEG C ± 10 DEG C, temperature retention time 20 ~ 30 minutes, air cooling;
6, again select φ 38mm external mold after hollow forging heat treatment, φ 32mm internal mold carries out indeformable cold-drawn, and Drawing Force is not less than 10 tons.This time draw does not change steel pipe sizes size, utilizes the interior epipolar restriction of cold drawing die to carry out oxide skin cleaning, makes steel tube surface smooth, highly polished, and do not change steel tube performance;
7, align: the production tube after heat treatment is carried out straightening processing, action≤0.2% total length after aligning; ≤ 1.5mm is bent apart from pipe end every meter;
8, cut: according to technological specification adjustment cutting machine, as requested steel pipe is cut, after cutting, cut tiltedly≤1.6mm
9, inspection warehouse-in: according to specification, outward appearance is carried out to production tube, size tests, store.
Advantage of the present invention is as follows:
Adopt the production technology after improving, ensure that the surface quality of steel pipe, steel tube surface is smooth, highly polished, consistent with the heat treated steel tube surface of non-oxidizing bright, does not affect steel tube performance again.Greatly reduce production cost.Five, the technique after improving and traditional handicraft compare the technique after improvement increase after heat treatment together with indeformable cold-drawn, make steel tube surface smooth, highly polished, and do not change steel tube performance.Traditional production technology oxidation is serious, and surface quality is poor.And adopt non-oxidizing bright heat treatment, although steel tube surface quality is good, highly polished, because equipment manufacturing cost is high, heat treatment cost is high, causes production cost significantly to improve.
Detailed description of the invention
A production method for best bright finish steel pipe, select material to be No. 20 steel, be of a size of the circular pipe blank of 38 × 3mm, include following operating procedure:
1, heating of pipe blank: φ 50mm circular pipe blank is through after the assay was approved, and circular pipe blank is sent into rotary heating furnace heating, heating-up temperature is 1200 DEG C ± 10 DEG C, is incubated after 50 ± 5 minutes and taps;
2, bore a hole: select φ 40mm top, φ 38mm push rod, adjustment piercer roll distance is the laggard eleven punch 11s of parameter such as 40mm, guide plate spacing 48mm, top head front-extending quantity 31mm, drafts 16%, and pierced shell is φ 52 × 4mm;
3, pickling, phosphatization, saponification: in adjustment pickle, sulfuric acid concentration is between 9% ~ 15%, Fe
2+≤ 200g/L, pickle temperature remains between 30 DEG C ~ 65 DEG C, by the pickling of φ 52 × 4mm hollow billet, cylinder is played after soaking 15min, rinse well with clear water, in adjustment Phosphating Solution, total acidity is between 16mol/L ~ 28mol/L, free acid is between 0.1mol/L ~ 1.0mol/L, Phosphating Solution temperature keeps 50 DEG C ~ 70 DEG C, by hollow billet phosphatization clean for pickling afterflush, cylinder is played after phosphating time 10 ~ 15min, rinse with clear water again, content of fatty acid>=1.0BN in adjustment saponification liquor, temperature is between 60 DEG C ~ 80 DEG C, by the hollow billet saponification after phosphatization, cylinder is played after saponification time 5min ~ 8min,
4, cold-drawn: select the external mold of φ 38mm and the internal mold of φ 32mm, carry out draw at the Drawing Force being no less than 36 tons, draw goes out φ 38 × 3mm hollow forging;
5, heat treatment: the normalized treatment of the φ 38 × 3mm hollow forging after cold-drawn being carried out 900 DEG C ± 10 DEG C, temperature retention time 20 ~ 30 minutes, air cooling;
6, again select φ 38mm external mold after hollow forging heat treatment, φ 32mm internal mold carries out indeformable cold-drawn, and Drawing Force is not less than 10 tons.This time draw does not change steel pipe sizes size, utilizes the interior epipolar restriction of cold drawing die to carry out oxide skin cleaning, makes steel tube surface smooth, highly polished, and do not change steel tube performance;
7, align: the production tube after heat treatment is carried out straightening processing, action≤0.2% total length after aligning; ≤ 1.5mm is bent apart from pipe end every meter;
8, cut: according to technological specification adjustment cutting machine, as requested steel pipe is cut, after cutting, cut tiltedly≤1.6mm
9, inspection warehouse-in: according to specification, outward appearance is carried out to production tube, size tests, store.
After traditional production technology Steel Pipe Heat process, namely align, cut, check warehouse-in, steel pipe is due to heat-treatment oxidation effect, and surface exists oxide skin.And adopt the heat treatment of non-oxidizing bright heat-treatment furnace, although ensure that the surface quality of steel pipe, equipment manufacturing cost is high, and production cost significantly improves.Adopt the production technology after improving to carry out indeformable cold-drawn after heat treatment, do not change steel pipe sizes size, only only pass through outer mold in cold-drawn and carry out the cleaning of oxide skin, make steel tube surface smooth, highly polished.And steel tube performance does not change.
The steel tube performance contrast table (with grade of steel for 20, specification is 38x3mm is example) that traditional processing technology and present invention process are produced.
Claims (1)
1. a production method for best bright finish steel pipe, select material to be No. 20 steel, be of a size of the circular pipe blank of 38 × 3mm, it is characterized in that, include following operating procedure:
(1), heating of pipe blank: φ 50mm circular pipe blank is through after the assay was approved, and circular pipe blank is sent into rotary heating furnace heating, heating-up temperature is 1200 DEG C ± 10 DEG C, is incubated after 50 ± 5 minutes and taps;
(2), perforation: select φ 40mm top, φ 38mm push rod, adjustment piercer roll distance is the laggard eleven punch 11s of parameter such as 40mm, guide plate spacing 48mm, top head front-extending quantity 31mm, drafts 16%, and pierced shell is φ 52 × 4mm;
(3), pickling, phosphatization, saponification: in adjustment pickle, sulfuric acid concentration is between 9% ~ 15%, Fe
2+≤ 200g/L, pickle temperature remains between 30 DEG C ~ 65 DEG C, by the pickling of φ 52 × 4mm hollow billet, cylinder is played after soaking 15min, rinse well with clear water, in adjustment Phosphating Solution, total acidity is between the mol/L of 16mol/L ~ 28, free acid is between 0.1 mol/L ~ 1.0 mol/L, Phosphating Solution temperature keeps 50 DEG C ~ 70 DEG C, by hollow billet phosphatization clean for pickling afterflush, cylinder is played after phosphating time 10 ~ 15min, rinse with clear water again, content of fatty acid>=1.0BN in adjustment saponification liquor, temperature is between 60 DEG C ~ 80 DEG C, by the hollow billet saponification after phosphatization, cylinder is played after saponification time 5min ~ 8min,
(4), cold-drawn: select the external mold of φ 38mm and the internal mold of φ 32mm, carry out draw at the Drawing Force being no less than 36 tons, draw goes out φ 38 × 3mm hollow forging;
(5), heat treatment: the normalized treatment of the φ 38 × 3mm hollow forging after cold-drawn being carried out 900 DEG C ± 10 DEG C, temperature retention time 20 ~ 30 minutes, air cooling;
(6), φ 38mm external mold is again selected after hollow forging heat treatment, φ 32mm internal mold carries out indeformable cold-drawn, Drawing Force is not less than 10 tons, this time draw does not change steel pipe sizes size, the interior epipolar restriction of cold drawing die is utilized to carry out oxide skin cleaning, make steel tube surface smooth, highly polished, and do not change steel tube performance;
(7), align: the production tube after heat treatment is carried out straightening processing, action≤0.2% total length after aligning; ≤ 1.5mm is bent apart from pipe end every meter;
(8), cutting: according to technological specification adjustment cutting machine, as requested steel pipe is cut, cut tiltedly≤1.6mm after cutting;
(9), inspection warehouse-in: according to specification, outward appearance is carried out to production tube, size tests, store.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410720037.1A CN104492850B (en) | 2014-12-02 | 2014-12-02 | A kind of production method of best bright finish steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410720037.1A CN104492850B (en) | 2014-12-02 | 2014-12-02 | A kind of production method of best bright finish steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104492850A true CN104492850A (en) | 2015-04-08 |
| CN104492850B CN104492850B (en) | 2016-08-17 |
Family
ID=52934350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410720037.1A Active CN104492850B (en) | 2014-12-02 | 2014-12-02 | A kind of production method of best bright finish steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104492850B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105834234A (en) * | 2016-03-29 | 2016-08-10 | 重庆钢铁(集团)有限责任公司 | Two-pass continuous drawing method for producing cold-drawn steel pipe |
| CN105834237A (en) * | 2016-03-29 | 2016-08-10 | 重庆钢铁(集团)有限责任公司 | Pierced billet chemical treatment method for reducing frequency of cold drawing |
| CN106216950A (en) * | 2016-07-29 | 2016-12-14 | 新昌县长城空调部件有限公司 | Gas-fired kitchen pipeline manufacturing process |
| CN107520271A (en) * | 2017-08-03 | 2017-12-29 | 常熟市异型钢管有限公司 | The production technology of the special-shaped steel high pressure seamless pipe of waste heat boiler |
| CN108127003A (en) * | 2017-12-06 | 2018-06-08 | 江苏银环精密钢管有限公司 | A kind of manufacturing method of drilling tool 23CrNi3Mo steel alloy seamless pipes |
| CN109457098A (en) * | 2018-12-28 | 2019-03-12 | 江苏建中新材料科技有限公司 | A kind of process improving mild steel steel strength |
| CN109604342A (en) * | 2018-11-14 | 2019-04-12 | 张家港华程特种材料股份有限公司 | A kind of processing method of seamless steel pipe |
| CN111041404A (en) * | 2019-12-09 | 2020-04-21 | 朗瑞(泰州)金属工具有限公司 | Heat treatment method for steel pipe plug |
| CN113618408A (en) * | 2021-08-06 | 2021-11-09 | 南京斯迈柯特种金属装备股份有限公司 | Thick-wall alloy preparation and processing technology |
| CN115572894A (en) * | 2022-09-08 | 2023-01-06 | 衢州垣发机械有限公司 | Inner tube of automobile friction shock absorber and preparation process thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003311317A (en) * | 2002-04-18 | 2003-11-05 | Sumitomo Metal Ind Ltd | Method for manufacturing seamless tube |
| CN101767114A (en) * | 2009-12-23 | 2010-07-07 | 攀枝花新钢钒股份有限公司 | Method for removing oxide skin in tube blank of seamless steel tube |
| CN102233365A (en) * | 2011-07-11 | 2011-11-09 | 徐州市全球通精密钢管有限公司 | Manufacturing process of small-diameter seamless steel tubes |
| CN102345035A (en) * | 2010-07-30 | 2012-02-08 | 宝鸡市海鹏金属材料有限公司 | Production process for titanium and nickel shape memory alloy material |
| CN203389984U (en) * | 2013-07-30 | 2014-01-15 | 无锡大金高精度冷拔钢管有限公司 | Special equipment for producing high-rigidity cold-drawn steel pipe |
| CN103691760A (en) * | 2013-12-17 | 2014-04-02 | 上海奉贤钢管厂 | Preparation process of stainless steel tube |
| CN103846304A (en) * | 2012-11-28 | 2014-06-11 | 常州盛德无缝钢管有限公司 | ND steel seamless steel pipe production process |
| CN103909111A (en) * | 2014-03-27 | 2014-07-09 | 攀钢集团成都钢钒有限公司 | Titanium alloy seamless tube and production method thereof |
-
2014
- 2014-12-02 CN CN201410720037.1A patent/CN104492850B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003311317A (en) * | 2002-04-18 | 2003-11-05 | Sumitomo Metal Ind Ltd | Method for manufacturing seamless tube |
| CN101767114A (en) * | 2009-12-23 | 2010-07-07 | 攀枝花新钢钒股份有限公司 | Method for removing oxide skin in tube blank of seamless steel tube |
| CN102345035A (en) * | 2010-07-30 | 2012-02-08 | 宝鸡市海鹏金属材料有限公司 | Production process for titanium and nickel shape memory alloy material |
| CN102233365A (en) * | 2011-07-11 | 2011-11-09 | 徐州市全球通精密钢管有限公司 | Manufacturing process of small-diameter seamless steel tubes |
| CN103846304A (en) * | 2012-11-28 | 2014-06-11 | 常州盛德无缝钢管有限公司 | ND steel seamless steel pipe production process |
| CN203389984U (en) * | 2013-07-30 | 2014-01-15 | 无锡大金高精度冷拔钢管有限公司 | Special equipment for producing high-rigidity cold-drawn steel pipe |
| CN103691760A (en) * | 2013-12-17 | 2014-04-02 | 上海奉贤钢管厂 | Preparation process of stainless steel tube |
| CN103909111A (en) * | 2014-03-27 | 2014-07-09 | 攀钢集团成都钢钒有限公司 | Titanium alloy seamless tube and production method thereof |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105834237A (en) * | 2016-03-29 | 2016-08-10 | 重庆钢铁(集团)有限责任公司 | Pierced billet chemical treatment method for reducing frequency of cold drawing |
| CN105834234A (en) * | 2016-03-29 | 2016-08-10 | 重庆钢铁(集团)有限责任公司 | Two-pass continuous drawing method for producing cold-drawn steel pipe |
| CN105834234B (en) * | 2016-03-29 | 2018-01-16 | 重庆钢铁(集团)有限责任公司 | A kind of method that two passage even pulls out production cold drawing steel tube |
| CN106216950B (en) * | 2016-07-29 | 2018-11-16 | 新昌县长城空调部件股份有限公司 | Gas-fired kitchen pipeline manufacturing process |
| CN106216950A (en) * | 2016-07-29 | 2016-12-14 | 新昌县长城空调部件有限公司 | Gas-fired kitchen pipeline manufacturing process |
| CN107520271A (en) * | 2017-08-03 | 2017-12-29 | 常熟市异型钢管有限公司 | The production technology of the special-shaped steel high pressure seamless pipe of waste heat boiler |
| CN108127003A (en) * | 2017-12-06 | 2018-06-08 | 江苏银环精密钢管有限公司 | A kind of manufacturing method of drilling tool 23CrNi3Mo steel alloy seamless pipes |
| CN109604342A (en) * | 2018-11-14 | 2019-04-12 | 张家港华程特种材料股份有限公司 | A kind of processing method of seamless steel pipe |
| CN109457098A (en) * | 2018-12-28 | 2019-03-12 | 江苏建中新材料科技有限公司 | A kind of process improving mild steel steel strength |
| CN111041404A (en) * | 2019-12-09 | 2020-04-21 | 朗瑞(泰州)金属工具有限公司 | Heat treatment method for steel pipe plug |
| CN111041404B (en) * | 2019-12-09 | 2024-03-15 | 朗瑞(泰州)金属工具有限公司 | Heat treatment method for steel pipe plug |
| CN113618408A (en) * | 2021-08-06 | 2021-11-09 | 南京斯迈柯特种金属装备股份有限公司 | Thick-wall alloy preparation and processing technology |
| CN113618408B (en) * | 2021-08-06 | 2022-07-29 | 南京斯迈柯特种金属装备股份有限公司 | Thick-wall alloy preparation and processing technology |
| CN115572894A (en) * | 2022-09-08 | 2023-01-06 | 衢州垣发机械有限公司 | Inner tube of automobile friction shock absorber and preparation process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104492850B (en) | 2016-08-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104492850A (en) | Production method of high-finish steel tube | |
| CN104759843B (en) | A kind of flange production technology | |
| CN102699103A (en) | Preparation method of 20CrMo steel pipe | |
| CN103736734B (en) | Hot rolling CPE unit prepares the technique of the super 13Cr seamless steel pipe of high-chromium alloy | |
| CN104338777A (en) | Production method of cold-drawn precision seamless steel pipes | |
| CN104338779A (en) | A method for manufacturing a high-precision cold-drawn steel pipe | |
| CN105414426B (en) | A kind of hot-swage method of kirsite small specification tube or bar | |
| CN108994247A (en) | A kind of gear shaft forging technology | |
| CN104440009A (en) | Iron sheet cutter manufacturing method | |
| CN104551669A (en) | Production method of cold-drawn high-precision seamless steel tube | |
| CN103658205A (en) | Method for processing titanium-nickel base shape memory alloy profiled bar | |
| CN102699104A (en) | Preparation method of G20CrNiMo bearing steel pipe | |
| CN107900628A (en) | Wind-powered electricity generation gear ring forging and its forging method | |
| CN105880934A (en) | Manufacturing method for high-precision cold-drawn inner-hole honed pipe | |
| CN104338778A (en) | Method for manufacturing precise inner hole honing tube | |
| CN104338781A (en) | Method for manufacturing high-hardness cold-drawn steel tube | |
| CN112718910A (en) | Manufacturing method of large-caliber TC4 titanium alloy thick-wall pipe | |
| CN104759834A (en) | Hot-rolled high-strength oil pipe manufacturing method | |
| CN105364412A (en) | Manufacturing method of cold-drawn high-strength fine-boring rolled pipe | |
| CN107755454A (en) | A kind of manufacture method of high-strength corrosion-resisting drawn tube for marine settings engineering | |
| CN104726806A (en) | Method used for preparing seamless aluminum brass tubes | |
| CN104438430B (en) | A kind of titanium alloy abnormal shape capillary tubes processing method | |
| EP2786814A1 (en) | Method for manufacturing seamless pipe | |
| CN104551540A (en) | Production method of cold-drawn precise cylinder tube | |
| CN106862879B (en) | A kind of cold-forging forming technique of the hollow output shaft with flange |
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 |