EP0184978A2 - Procédé pour la fabrication de tubes pour l'industrie pétrolière et du gaz naturel et pour tiges de forage - Google Patents
Procédé pour la fabrication de tubes pour l'industrie pétrolière et du gaz naturel et pour tiges de forage Download PDFInfo
- Publication number
- EP0184978A2 EP0184978A2 EP85730120A EP85730120A EP0184978A2 EP 0184978 A2 EP0184978 A2 EP 0184978A2 EP 85730120 A EP85730120 A EP 85730120A EP 85730120 A EP85730120 A EP 85730120A EP 0184978 A2 EP0184978 A2 EP 0184978A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- pipe
- welding
- connectors
- steel
- deburring
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims description 8
- 238000000034 method Methods 0.000 title claims description 5
- 239000003345 natural gas Substances 0.000 title claims description 4
- 239000003209 petroleum derivative Substances 0.000 title claims description 3
- 238000005553 drilling Methods 0.000 title description 4
- 238000003466 welding Methods 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 238000005496 tempering Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 6
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 4
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 4
- 238000010791 quenching Methods 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 239000012085 test solution Substances 0.000 claims description 4
- 230000000171 quenching effect Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/14—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
Definitions
- the invention relates to a method for producing pipes on the one hand according to the preamble of claim 1 and, on the other hand, screwable units of a drill pipe according to the preamble of claim 2.
- Pipes for the petroleum and natural gas industry and screwable units of a drill pipe are used for drilling wells in large depths or for the transmission of petroleum also in the aboveground area.
- the pipes are mainly mechanically stressed by internal pressure and longitudinal forces, the units by the mass of the drill head, their own mass and the drilling torque and bending. For this reason, only heat-treated pipes and units are used, which are coated with so-called connectors. These are flange connectors or particularly thick-walled, short pipe sections with a thread, through which the units are connected to form a drill pipe.
- the connectors were previously screwed onto the pipe ends of the units and then welded.
- it is already common to weld the pipe connectors e.g. B. friction welding to connect to the tube and deburr the weld and treat by stress relief annealing.
- Such pipes and units meet the physical properties placed on them (yield strength, elongation). In the presence of moist acid gas, they can only be loaded up to a small part of their yield strength. In particular, the transition area welding to base material in pipes of previous manufacture is extremely susceptible to stress corrosion cracking. The stress corrosion cracking resistance is tested in a hydrogen sulfide-saturated test solution according to the NACE standard TM-01-77.
- the object of the invention is to increase the corrosion resistance of the pipe and the unit and to match the physical resistance.
- the problem is solved in generic tubes and units for drill pipe in the measures according to the characterizing features of the claims.
- the claims stand side by side in that they concern the manufacture of different types of pipes.
- the claim 1 relates to pipes through which hydrogen sulfide-containing oil or natural gas is mainly passed on to the surface of the earth and also units for which protection is particularly claimed according to claim 2 and which are used for the production of boreholes and which are in a so-called acid gas-rich environment under high mechanical Stress.
- the wall thickness at the pipe ends can be thickened by axial compression in the die. The wall thickening also creates a wider welding area.
- the connectors are generally flanges or short, very thick-walled pipe sections. The latter are twisted on one side to the wall thickness of the thickened pipe ends and prepared for the thread area. These connectors also do not need to be heat treated before welding.
- connectors with a pre-turned external thread and with an internal thread, which are press-welded in pairs at the ends of the pipe.
- the protruding ridge is removed.
- the pipe and connector are made of a steel composition that is not resistant to abrasive corrosion.
- inhibitors are usually added to the drilling fluid, so that the erosive corrosion is irrelevant.
- the steel composition is adjusted so that the wall thickness in the case of water or oil quenching kung is largely hardened to the greatest possible thicknesses on the pipe and on the connectors, ie it takes on fairly uniform hardness over the full wall thickness and thus has the same strength properties.
- the pipe for the oil industry and the units of a drill pipe manufactured so far are hardened as a whole. As far as the dimensional range allows, the immersion process is used. These parts are then left on and the heat treatment ends with cooling in air.
- the temperature control to be used results from the characterizing features of claim 3.
- the parts have a uniform structure and thus the same mechanical properties over the entire length, in particular in the welding area and the area of the base material influenced by the welding heat as well as comparable corrosion resistance.
- An embodiment of the invention relates to a unit of a drill pipe and is based on the following steel composition (mass percent):
- the output tubes are made from continuous cast billets by cross rolling, stretching over a cylindrical rod in the continuous rolling mill and by reducing the stretch to the final dimension of 114.3 diameter x 9.19 mm Wall thickness rolled and cooled in still air. In a renewed heating, however, only at the ends to a length of approximately 300 mm, the wall thickness is compressed to approximately 22 mm with an outer diameter of approximately 131 mm. It is cooled again in still air.
- the connector and the outlet pipe are connected by friction welding and deburred, as described in DE-PS 31 33 181.
- the full length of the drill pipe unit is now available. So it is quench hardening and tempering a system supplied, as described in DE-PS 15 83 993. Quenching is done from a temperature of 890 ° C in oil for about 120 seconds.
- the drill pipe unit is then laid out on a grate in still air.
- the tempering temperature is 690 ° C. After cooling in air, straightening can be provided.
- the drill pipe unit now has the following physical properties
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Earth Drilling (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Arc Welding In General (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19843445371 DE3445371A1 (de) | 1984-12-10 | 1984-12-10 | Verfahren zum herstellen von rohren fuer die erdoel- und erdgasindustrie und von bohrgestaengeeinheiten |
DE3445371 | 1984-12-10 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0184978A2 true EP0184978A2 (fr) | 1986-06-18 |
EP0184978A3 EP0184978A3 (en) | 1988-08-24 |
EP0184978B1 EP0184978B1 (fr) | 1991-12-27 |
Family
ID=6252612
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85730120A Expired - Lifetime EP0184978B1 (fr) | 1984-12-10 | 1985-09-11 | Procédé pour la fabrication de tubes pour l'industrie pétrolière et du gaz naturel et pour tiges de forage |
Country Status (7)
Country | Link |
---|---|
US (1) | US4710245A (fr) |
EP (1) | EP0184978B1 (fr) |
JP (1) | JPS61140694A (fr) |
CN (1) | CN1014908B (fr) |
CA (1) | CA1245135A (fr) |
DE (1) | DE3445371A1 (fr) |
NO (1) | NO167096C (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100424195C (zh) * | 2005-12-20 | 2008-10-08 | 渤海能克钻杆有限公司 | 抗硫钻杆接头的热处理工艺 |
CN102140611A (zh) * | 2011-03-18 | 2011-08-03 | 上海海隆石油管材研究所 | 一种135钢级钻杆接头及其热处理工艺 |
Families Citing this family (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5019189A (en) * | 1989-04-13 | 1991-05-28 | Kawasaki Steel Corporation | Steel pipe and a method for welding thereof and pipeline resistant to carbon dioxide corrosion |
US5871640A (en) * | 1997-03-25 | 1999-02-16 | Gavin; Norman | Filter and housing |
US6012744A (en) * | 1998-05-01 | 2000-01-11 | Grant Prideco, Inc. | Heavy weight drill pipe |
US6148925A (en) * | 1999-02-12 | 2000-11-21 | Moore; Boyd B. | Method of making a conductive downhole wire line system |
CN1102673C (zh) * | 2000-01-25 | 2003-03-05 | 天津钢管公司 | 超稠油热采井用高强度石油套管及其生产方法 |
SE525664C2 (sv) * | 2003-05-16 | 2005-03-29 | Atlas Copco Secoroc Ab | Skarvstång samt förfarande för framställning av denna |
CN1304619C (zh) * | 2003-11-21 | 2007-03-14 | 天津钢管有限责任公司 | 石油天然气开采中深井、超深井石油套管 |
CN1329546C (zh) * | 2004-04-28 | 2007-08-01 | 宝山钢铁股份有限公司 | 高强度石油钻杆及其制造方法 |
JP4216230B2 (ja) * | 2004-07-09 | 2009-01-28 | 日産自動車株式会社 | 鍛造部品の製造方法及び自動車用サスペンションアームの製造方法 |
CN100419111C (zh) * | 2005-12-12 | 2008-09-17 | 无锡西姆莱斯石油专用管制造有限公司 | 抗硫化氢应力腐蚀油井管及其生产方法 |
EP2325435B2 (fr) | 2009-11-24 | 2020-09-30 | Tenaris Connections B.V. | Joint fileté étanche à des pressions internes et externes [extrêmement hautes] |
US9163296B2 (en) | 2011-01-25 | 2015-10-20 | Tenaris Coiled Tubes, Llc | Coiled tube with varying mechanical properties for superior performance and methods to produce the same by a continuous heat treatment |
IT1403689B1 (it) | 2011-02-07 | 2013-10-31 | Dalmine Spa | Tubi in acciaio ad alta resistenza con eccellente durezza a bassa temperatura e resistenza alla corrosione sotto tensioni da solfuri. |
US8414715B2 (en) | 2011-02-18 | 2013-04-09 | Siderca S.A.I.C. | Method of making ultra high strength steel having good toughness |
US9340847B2 (en) | 2012-04-10 | 2016-05-17 | Tenaris Connections Limited | Methods of manufacturing steel tubes for drilling rods with improved mechanical properties, and rods made by the same |
WO2014108756A1 (fr) | 2013-01-11 | 2014-07-17 | Tenaris Connections Limited | Joint d'outil de tige de forage résistant au grippage et tige de forage correspondante |
US9803256B2 (en) | 2013-03-14 | 2017-10-31 | Tenaris Coiled Tubes, Llc | High performance material for coiled tubing applications and the method of producing the same |
EP2789700A1 (fr) | 2013-04-08 | 2014-10-15 | DALMINE S.p.A. | Tuyaux en acier sans soudure trempé et revenu à paroi lourde et procédé de fabrication des tuyaux d'acier |
EP2789701A1 (fr) | 2013-04-08 | 2014-10-15 | DALMINE S.p.A. | Tuyaux en acier sans soudure trempé et revenu à paroi moyenne haute résistance et procédé de fabrication des tuyaux d'acier |
KR102368928B1 (ko) | 2013-06-25 | 2022-03-04 | 테나리스 커넥션즈 비.브이. | 고크롬 내열철강 |
DE102014102452A1 (de) | 2014-02-25 | 2015-08-27 | Vallourec Deutschland Gmbh | Verfahren zur Herstellung von warmgewalzten, nahtlosen Rohren aus umwandlungsfähigem Stahl, insbesondere für Rohrleitungen für Tiefwasseranwendungen und entsprechende Rohre |
CN104651591B (zh) * | 2014-11-21 | 2017-02-01 | 宝鸡石油钢管有限责任公司 | 一种高强度低硬度连续油管的制备方法 |
US20160305192A1 (en) | 2015-04-14 | 2016-10-20 | Tenaris Connections Limited | Ultra-fine grained steels having corrosion-fatigue resistance |
US11124852B2 (en) | 2016-08-12 | 2021-09-21 | Tenaris Coiled Tubes, Llc | Method and system for manufacturing coiled tubing |
US10434554B2 (en) | 2017-01-17 | 2019-10-08 | Forum Us, Inc. | Method of manufacturing a coiled tubing string |
GB2569790B (en) * | 2017-12-21 | 2020-10-21 | Technip France | Method of Preparing a Pipe-Section |
CN109161788B (zh) * | 2018-08-06 | 2022-03-22 | 中国石油天然气集团有限公司 | 一种注热蒸汽稠油热采井用耐高温石油套管及其制造方法 |
CN111485069A (zh) * | 2020-05-27 | 2020-08-04 | 中地装(无锡)钻探工具有限公司 | 一种钻杆及其连接处螺纹表面的处理工艺 |
CN111575450A (zh) * | 2020-06-15 | 2020-08-25 | 大冶特殊钢有限公司 | 一种无缝钢管及其制备方法 |
CN112143972B (zh) * | 2020-09-23 | 2021-12-21 | 达力普石油专用管有限公司 | 一种高强度耐热油套管材料及其制备方法 |
CN112453737B (zh) * | 2020-10-27 | 2022-09-23 | 武汉理工大学 | 一种油气运输金属管道墩头焊接方法 |
CN112780849B (zh) * | 2021-01-05 | 2022-05-13 | 中国石油大学(北京) | 具有内过渡段的不等壁厚管道的设计方法 |
CN114941071A (zh) * | 2022-04-14 | 2022-08-26 | 湘潭大学 | 一种改善低碳钢钎焊油管强度和疲劳性能的方法 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2895861A (en) * | 1957-05-28 | 1959-07-21 | Creusot Forges Ateliers | Process for improving stress corrosion cracking resistance of alloyed steel in hydrogen sulphide atmosphere |
FR2445888A1 (fr) * | 1979-01-08 | 1980-08-01 | Republic Steel Corp | Procede de fabrication d'un tubage de puits et ce tubage |
DE2935690A1 (de) * | 1979-09-04 | 1981-03-12 | Kawasaki Steel Corp., Kobe, Hyogo | Verfahren zum herstellen von roehrenstahl fuer eine oelbohrung. |
US4273159A (en) * | 1978-03-16 | 1981-06-16 | Smith International, Inc. | Earth boring apparatus with multiple welds |
EP0064730A2 (fr) * | 1981-05-08 | 1982-11-17 | Lone Star Steel Company | Tubages ayant des caractéristiques mécaniques élevées pour applications critiques dans les champs pétrolifères et procédé pour leur fabrication |
DE3344541C1 (de) * | 1983-12-09 | 1984-07-19 | Berchem & Schaberg Gmbh, 4650 Gelsenkirchen | Schweißbare Rohre für abrasive Beanspruchungen |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60141825A (ja) * | 1983-12-27 | 1985-07-26 | Ishikawajima Harima Heavy Ind Co Ltd | 二重管部を有する管体の熱処理方法 |
-
1984
- 1984-12-10 DE DE19843445371 patent/DE3445371A1/de active Granted
-
1985
- 1985-09-11 EP EP85730120A patent/EP0184978B1/fr not_active Expired - Lifetime
- 1985-10-10 CN CN85107452A patent/CN1014908B/zh not_active Expired
- 1985-10-16 JP JP60230884A patent/JPS61140694A/ja active Granted
- 1985-11-20 NO NO854641A patent/NO167096C/no unknown
- 1985-12-06 CA CA000497033A patent/CA1245135A/fr not_active Expired
- 1985-12-09 US US06/806,764 patent/US4710245A/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2895861A (en) * | 1957-05-28 | 1959-07-21 | Creusot Forges Ateliers | Process for improving stress corrosion cracking resistance of alloyed steel in hydrogen sulphide atmosphere |
US4273159A (en) * | 1978-03-16 | 1981-06-16 | Smith International, Inc. | Earth boring apparatus with multiple welds |
FR2445888A1 (fr) * | 1979-01-08 | 1980-08-01 | Republic Steel Corp | Procede de fabrication d'un tubage de puits et ce tubage |
DE2935690A1 (de) * | 1979-09-04 | 1981-03-12 | Kawasaki Steel Corp., Kobe, Hyogo | Verfahren zum herstellen von roehrenstahl fuer eine oelbohrung. |
EP0064730A2 (fr) * | 1981-05-08 | 1982-11-17 | Lone Star Steel Company | Tubages ayant des caractéristiques mécaniques élevées pour applications critiques dans les champs pétrolifères et procédé pour leur fabrication |
DE3344541C1 (de) * | 1983-12-09 | 1984-07-19 | Berchem & Schaberg Gmbh, 4650 Gelsenkirchen | Schweißbare Rohre für abrasive Beanspruchungen |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100424195C (zh) * | 2005-12-20 | 2008-10-08 | 渤海能克钻杆有限公司 | 抗硫钻杆接头的热处理工艺 |
CN102140611A (zh) * | 2011-03-18 | 2011-08-03 | 上海海隆石油管材研究所 | 一种135钢级钻杆接头及其热处理工艺 |
Also Published As
Publication number | Publication date |
---|---|
CA1245135A (fr) | 1988-11-22 |
DE3445371A1 (de) | 1986-06-12 |
US4710245A (en) | 1987-12-01 |
DE3445371C2 (fr) | 1987-12-10 |
NO167096C (no) | 1991-10-02 |
NO854641L (no) | 1986-06-11 |
JPH0534558B2 (fr) | 1993-05-24 |
CN1014908B (zh) | 1991-11-27 |
CN85107452A (zh) | 1986-05-10 |
EP0184978A3 (en) | 1988-08-24 |
EP0184978B1 (fr) | 1991-12-27 |
NO167096B (no) | 1991-06-24 |
JPS61140694A (ja) | 1986-06-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0184978B1 (fr) | Procédé pour la fabrication de tubes pour l'industrie pétrolière et du gaz naturel et pour tiges de forage | |
EP1109637B1 (fr) | Vis autotaraudeuse en alliage leger et son procede de production | |
EP0205828B1 (fr) | Procédé et utilisation d'un acier pour la fabrication de tubes en acier à haute résistance aux gaz acides | |
WO2015128282A1 (fr) | Procédé de fabrication de tubes laminés à chaud sans cordon en acier transformable, notamment pour des conduites tubulaires destinées à des applications en eau profonde, et tubes correspondants | |
DE1508416A1 (de) | Verfahren zur Herstellung von Stahlteilen | |
EP3389887B1 (fr) | Procédé de fabrication d'un tube haute pression | |
EP0172544B2 (fr) | Procédé de traitement thermique d'aciers laminés à chaud sous forme de barres ou de fils pour béton précontraint | |
AT392802B (de) | Verfahren zur herstellung von spannungsrisskorrosionsbestaendigen rohrfoermigen koerpern, insbesondere nichtmagnetisierbaren schwerstangen aus austenitischen staehlen | |
DE102009016079B4 (de) | Kugelzapfen aus einem Stahl mit bainitischem Gefüge und Verfahren zur Herstellung derartiger Kugelzapfen | |
DE102017101931B4 (de) | Hochfeste Schraube mit einem enthärteten Gewindeende | |
DE3311606C2 (fr) | ||
DE3631928C2 (de) | Verfahren zur Herstellung von Walzstahlerzeugnissen | |
DD149380A5 (de) | Verfahren zur herstellung von walzstahlerzeugnissen mit erhoehter streckgrenze | |
DE2146308A1 (de) | Gegen Wasserstoffversprödung resistente Stahlrohre hoher Streckgrenze und Stähle zur Herstellung solcher Rohre | |
DE10000796A1 (de) | Verfahren und Vorrichtung zur Autofrettage von fertig gebogenen oder sonst umgeformten Rohleitungen | |
DE3633058C1 (de) | Verfahren und Vorrichtung zur Herstellung einer Schraubenfeder | |
EP3460078B1 (fr) | Pièce de raccordement à un corps de base métallique destinée à visser des tuyaux et son procédé de fabrication | |
DE102007019171B4 (de) | Vorrichtung und Verfahren zur Wärmebehandlung eines Rohrkörpers eines Förderrohrs | |
DE1433719A1 (de) | Verfahren zur Verbesserung der Korrosionsfestigkeit von Metallen | |
DE1483022C2 (de) | Verfahren zur Herstellung von Drehstäben | |
DE1558004C2 (de) | Verfahren zur Wärmebehandlung von Schweißnähten | |
DE69225065T2 (de) | Rostfreies nicht-magnetisches Stahl mit hohem Mangan- und Chromgehalt, mit hohe Widerstandsfähigkeit gegen Spannungskorrosion und verwendbar für Bohrausrüstungen sowie Verfahren zur Herstellung von Stangen aus diesen Stahl | |
DE102017003200A1 (de) | Verfahren zur Herstellung plattierter Rundstäbe | |
DE2935690C2 (de) | Verfahren zum Herstellen von Röhrenstahl | |
EP3532645B1 (fr) | Procédé d'élaboration d'une crémaillère et crémaillère ainsi obtenue |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): BE FR GB IT NL SE |
|
17P | Request for examination filed |
Effective date: 19861216 |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): BE FR GB IT NL SE |
|
17Q | First examination report despatched |
Effective date: 19900622 |
|
ITF | It: translation for a ep patent filed | ||
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE FR GB IT NL SE |
|
ET | Fr: translation filed | ||
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19930812 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19930813 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19930816 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19930817 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19930930 Year of fee payment: 9 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19940911 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19940912 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Effective date: 19940930 |
|
EAL | Se: european patent in force in sweden |
Ref document number: 85730120.4 |
|
BERE | Be: lapsed |
Owner name: MANNESMANN A.G. Effective date: 19940930 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19950401 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19940911 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19950531 |
|
EUG | Se: european patent has lapsed |
Ref document number: 85730120.4 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |