EP0710731A2 - Utilisation d'un alliage ferreux contenant de l'azote pour pièces de machine soumises à une friction de surface coulissante - Google Patents
Utilisation d'un alliage ferreux contenant de l'azote pour pièces de machine soumises à une friction de surface coulissante Download PDFInfo
- Publication number
- EP0710731A2 EP0710731A2 EP95890181A EP95890181A EP0710731A2 EP 0710731 A2 EP0710731 A2 EP 0710731A2 EP 95890181 A EP95890181 A EP 95890181A EP 95890181 A EP95890181 A EP 95890181A EP 0710731 A2 EP0710731 A2 EP 0710731A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- iron
- max
- based alloy
- pref
- alloy according
- 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.)
- Ceased
Links
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 33
- 239000000956 alloy Substances 0.000 title claims abstract description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 38
- 229910052742 iron Inorganic materials 0.000 title claims description 19
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 title 1
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 10
- 238000002485 combustion reaction Methods 0.000 claims abstract description 4
- 238000006073 displacement reaction Methods 0.000 claims abstract description 4
- 150000004767 nitrides Chemical class 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 30
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 238000005121 nitriding Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000005229 chemical vapour deposition Methods 0.000 claims 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract 4
- 239000012535 impurity Substances 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 238000005452 bending Methods 0.000 description 5
- 239000011651 chromium Substances 0.000 description 5
- 238000000137 annealing Methods 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910002065 alloy metal Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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 the use of an iron-based alloy according to the Preamble of claim 1. Furthermore, the invention relates to a Plunger and / or a piston ring.
- Machine parts that function as high or main Stress caused by sliding friction, especially surface friction are preferably made of cast materials.
- Cast parts have the advantage that they are essentially isometric Experience changes in shape when the temperature changes, therefore in practice Use does not look bad, a largely undirected structure have a homogeneous microhard particle distribution, for example Carbide distribution, and have such a soft matrix configuration.
- Such a structure has a particularly advantageous effect on friction surfaces reduces the frictional forces as well as the material removal in particular inadequate or low and / or imperfect lubricant deposits Surface.
- plain bearings, cylinder liners, piston rings and similar machine parts that are subjected to high stress Exposed to sliding friction, mainly from cast or sintered Materials, especially iron-based alloys.
- deformed material i.e. materials, who may have a line-shaped deformation structure.
- deformed parts i.e. those with a micro-texture, mostly corresponded at least partially the requirements placed on them in practical operation; at the manufacture, however, involves a large number of complex process steps necessary for a shape or dimension required for the use and set the desired material properties.
- Piston rings made of deformed materials can be manufactured be by essentially after rolling and optionally drawing of a profile wire, this is tempered and wound into a spiral or cold-formed becomes. It is advantageous if at least after a necessary annealing partial reduction of the cold forming stresses or hardening of them spiral preform of the profile wire to a piston ring spiral, if necessary with smaller radius adapted to the respective piston ring diameter, is wrapped or further deformed, whereupon, preferably after another Relaxation treatment or annealing, a slicing, essentially in Direction of a generator, which may be out of round spiral and the individual rings formed are then processed.
- a slicing essentially in Direction of a generator, which may be out of round spiral and the individual rings formed are then processed.
- An out of round Shape of the piston rings in the relaxed state can be chosen to in their Working position in the cylinder pressed radially inwards on all sides around an inside substantially equal specific contact pressure of the outer ring surface to the Reach cylinder wall.
- the piston rings should have a hardness of 35 HRC to 45 HRC, especially over 40 HRC.
- the invention aims to overcome the disadvantages of the materials used to date for the production of machine parts that function as high Avoid exposure to sliding surface friction and the use of an alloy, which is high hardness and high Bending toughness with improved performance properties and great Propose economy in the manufacture of the parts.
- the invention is also based on the object of being corrosion-resistant Plunger and piston rings with improved properties in the to create practical use.
- This goal is achieved by using an iron based alloy containing the Elements carbon, silicon, manganese, nitrogen, chromium, molybdenum and vanadium and optionally aluminum, cobalt, nickel, tungsten, niobium and titanium Provided that the sum of the concentration of carbon and nitrogen one Value of at least 0.5 and at most 1.2, preferably at least 0.61, but at most 0.95, results, the rest iron and melting-related Additives for the production of machine parts that function as a exposed to high stresses caused by sliding surface friction.
- the advantages achieved by the invention can be seen essentially in the fact that by alloying an iron base alloy with both carbon and Nitrogen in a certain ratio and within a certain Concentration range the performance characteristics of a manufactured Machine part, especially with regard to high stress sliding surface friction, are surprisingly significantly improved synergistically.
- a high material hardness is due to both elements, i.e. carbon and Nitrogen causes so that the absolute carbon content of the proposed Alloy lowered and thereby the bending toughness are increased. Is natural this also reduces the carbide content, in particular the Cr carbide content, which increases the Cr concentration in the matrix and the corrosion resistance of the material can be significantly improved. Due to the nitrogen content also causes a special fine grain structure and grain growth largely hindered even at high temperatures.
- the Iron-based alloy used according to the invention at least partially with a Surface nitriding layer is provided.
- Nitriding the finished part to Example of a piston ring can be done during a tempering treatment and is therefore particularly economical to carry out. It is convenient if the Alloy contains aluminum because this promotes nitriding layer formation. Nitriding causes an increase in volume of the Material, which causes the tensile stresses on the surface of the bend stressed part reduced, reduced or converted into compressive stresses and the risk of crack initiation is largely eliminated.
- the Friction surface of the part with at least a depth of 0.05 mm, preferably of greater than 0.2 mm, nitrided or carbonitrided, high surface hardness and also achieved extremely low sliding friction values.
- a plunger in particular for the displacement of corrosive media characterized in that it is made of an iron-based alloy according to claim 1 and consists of a layer applied by the PVD or CVD process Carbide and / or nitride of the elements Al and / or Ti carries.
- a piston ring according to the invention in particular for internal combustion engines, is characterized in that it is made of an iron-based alloy Claim 1 is formed and optionally at least partially, in particular of the surface mainly exposed to friction, a nitriding layer with a Thickness of at least 0.05 mm, preferably greater than 0.2 mm.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0205194A AT402224B (de) | 1994-11-04 | 1994-11-04 | Verwendung einer eisenbasislegierung sowie plungerkolben und kolbenring |
| AT2051/94 | 1994-11-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0710731A2 true EP0710731A2 (fr) | 1996-05-08 |
| EP0710731A3 EP0710731A3 (fr) | 1996-11-27 |
Family
ID=3526724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95890181A Ceased EP0710731A3 (fr) | 1994-11-04 | 1995-10-11 | Utilisation d'un alliage ferreux contenant de l'azote pour pièces de machine soumises à une friction de surface coulissante |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5916517A (fr) |
| EP (1) | EP0710731A3 (fr) |
| AT (1) | AT402224B (fr) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19924515A1 (de) * | 1999-05-28 | 2000-11-30 | Edelstahl Witten Krefeld Gmbh | Sprühkompaktierter Stahl, Verfahren zu seiner Herstellung und Verbundwerkstoff |
| EP1304393A1 (fr) * | 2000-07-17 | 2003-04-23 | Kabushiki Kaisha Riken | Segment de piston presentant une resistance elevee a l'erosion, a la fissuration et a la fatigue, procede permettant de produire ce segment et combinaison segment de piston et bloc-cylindres |
| DE19808276C2 (de) * | 1998-02-27 | 2003-12-24 | Stahlwerk Ergste Westig Gmbh | Stahllegierung für Gleitelemente |
| DE102006007148A1 (de) * | 2006-02-16 | 2007-08-30 | Volkswagen Ag | Kolben für Verbrennungsmotoren und Verfahren zur Herstellung eines Kolbens für Verbrennungsmotoren |
| EP2810737A4 (fr) * | 2012-01-31 | 2016-03-23 | Kobe Steel Ltd | Pièce mécanique soudée par un matériau de recouvrement de soudure et un métal de recouvrement de soudure |
| DE102019120611A1 (de) * | 2019-07-31 | 2020-05-28 | Schaeffler Technologies AG & Co. KG | Hebelartiger Nockenfolger und dessen Verwendung |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW477821B (en) * | 1998-12-24 | 2002-03-01 | Nisshin Steel Co Ltd | An abrasion-resistant steel and a weaving machine member make of an abrasion-resistant |
| DE10014515C2 (de) * | 2000-03-23 | 2003-03-13 | Federal Mogul Burscheid Gmbh | Kolbenring mit Verschleißschutzschicht sowie Verschleißschutzschicht für einen Kolbenring |
| US6485026B1 (en) | 2000-10-04 | 2002-11-26 | Dana Corporation | Non-stainless steel nitrided piston ring, and method of making the same |
| DE20104270U1 (de) * | 2001-03-13 | 2002-07-18 | Bosch Gmbh Robert | Verbindung zweier koaxial hintereinander angeordneter Elemente einer Kraftstoffversorgungsanlage einer Brennkraftmaschine |
| JP4427790B2 (ja) * | 2004-06-04 | 2010-03-10 | 大同特殊鋼株式会社 | マルテンサイト系ステンレス鋼 |
| CN106636895A (zh) * | 2016-11-30 | 2017-05-10 | 重庆材料研究院有限公司 | 特种轴承钢及其制造方法 |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3990892A (en) * | 1972-03-28 | 1976-11-09 | Kabushiki Kaisha Fujikoshi | Wear resistant and heat resistant alloy steels |
| US3969109A (en) * | 1974-08-12 | 1976-07-13 | Armco Steel Corporation | Oxidation and sulfidation resistant austenitic stainless steel |
| US4150978A (en) * | 1978-04-24 | 1979-04-24 | Latrobe Steel Company | High performance bearing steels |
| JPS55134159A (en) * | 1979-04-06 | 1980-10-18 | Daido Steel Co Ltd | Vortex combustion chamber member for diesel engine and mouthpiece material thereof |
| AT392485B (de) * | 1985-05-21 | 1991-04-10 | Boehler Gmbh | Werkstoff zur herstellung von stanz- und gegenplatten |
| EP0295111B1 (fr) * | 1987-06-11 | 1994-11-02 | Aichi Steel Works, Ltd. | Acier présentant une résistance élevée à l'usure |
| JPH0577308A (ja) * | 1991-04-24 | 1993-03-30 | Hitachi Metals Ltd | 合成樹脂成形用スクリユ |
| DE4212966C2 (de) * | 1992-04-18 | 1995-07-13 | Ver Schmiedewerke Gmbh | Verwendung eines martensitischen Chrom-Stahls |
| JPH0665639A (ja) * | 1992-08-19 | 1994-03-08 | Nippon Steel Corp | 均一微細な炭化物組織を有し衝撃靭性に優れた高炭素含有ステンレス鋼帯の製造方法 |
| FR2708939B1 (fr) * | 1993-08-11 | 1995-11-03 | Sima Sa | Acier martensitique à l'azote à faible teneur en carbone et son procédé de fabrication. |
| AT401387B (de) * | 1994-06-29 | 1996-08-26 | Boehler Ybbstalwerke | Korrosionsbeständige legierung und verfahren zur herstellung korrosionsbeständiger schneidwaren |
-
1994
- 1994-11-04 AT AT0205194A patent/AT402224B/de not_active IP Right Cessation
-
1995
- 1995-10-11 EP EP95890181A patent/EP0710731A3/fr not_active Ceased
- 1995-11-06 US US08/553,870 patent/US5916517A/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| None |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19808276C2 (de) * | 1998-02-27 | 2003-12-24 | Stahlwerk Ergste Westig Gmbh | Stahllegierung für Gleitelemente |
| DE19924515A1 (de) * | 1999-05-28 | 2000-11-30 | Edelstahl Witten Krefeld Gmbh | Sprühkompaktierter Stahl, Verfahren zu seiner Herstellung und Verbundwerkstoff |
| EP1304393A1 (fr) * | 2000-07-17 | 2003-04-23 | Kabushiki Kaisha Riken | Segment de piston presentant une resistance elevee a l'erosion, a la fissuration et a la fatigue, procede permettant de produire ce segment et combinaison segment de piston et bloc-cylindres |
| EP1304393A4 (fr) * | 2000-07-17 | 2005-08-03 | Riken Kk | Segment de piston presentant une resistance elevee a l'erosion, a la fissuration et a la fatigue, procede permettant de produire ce segment et combinaison segment de piston et bloc-cylindres |
| DE102006007148A1 (de) * | 2006-02-16 | 2007-08-30 | Volkswagen Ag | Kolben für Verbrennungsmotoren und Verfahren zur Herstellung eines Kolbens für Verbrennungsmotoren |
| EP2810737A4 (fr) * | 2012-01-31 | 2016-03-23 | Kobe Steel Ltd | Pièce mécanique soudée par un matériau de recouvrement de soudure et un métal de recouvrement de soudure |
| DE102019120611A1 (de) * | 2019-07-31 | 2020-05-28 | Schaeffler Technologies AG & Co. KG | Hebelartiger Nockenfolger und dessen Verwendung |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0710731A3 (fr) | 1996-11-27 |
| ATA205194A (de) | 1996-07-15 |
| AT402224B (de) | 1997-03-25 |
| US5916517A (en) | 1999-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE60122164T2 (de) | Kolbenring mit ausgezeichneter beständigkeit gegen reibung, rissbildung und ermüdung und herstellungsverfahren dafür und kombination von kolbenriing und zylinderblock | |
| DE3922720C2 (fr) | ||
| DE10020118B4 (de) | Wälzlagerbauteil | |
| EP2411708B1 (fr) | Composition de matériau à base d'acier apte à être nitrurée pour fabriquer des segments de piston et des chemises de cylindre | |
| EP1837415B1 (fr) | Alliages pour palier à roulement | |
| DE19654893A1 (de) | Gußeisenlegierung für die Herstellung von Kolbenringen von Verbrennungskraftmaschinen | |
| DE112012001018T5 (de) | Kolbenring | |
| AT402224B (de) | Verwendung einer eisenbasislegierung sowie plungerkolben und kolbenring | |
| AT505699B1 (de) | Verfahren zur herstellung eines sintergehärteten bauteils | |
| DE3041565C2 (fr) | ||
| EP3536812A1 (fr) | Vis composée de deux métaux à acier marténsitique thermodurcissable | |
| DE19908407A1 (de) | Hochfeste Ventilfeder und Verfahren zu ihrer Herstellung | |
| DE10319828B4 (de) | Gesintertes Kettenrad und Verfahren zur Herstellung hierfür | |
| EP1274872B1 (fr) | Procede de production d'un acier allie a l'azote, compacte par pulverisation | |
| DE19852734A1 (de) | Feder mit verbesserter Korrosionsermüdungsbeständigkeit | |
| DE19960235B4 (de) | Wälzlager | |
| DE102006041902A1 (de) | Bauteile aus Ultrahochkohlenstoffhaltigen Stählen mit reduzierter Dichte und hoher Zunderbeständigkeit | |
| DE19836360B4 (de) | Kolbenringmaterial mit hervorragender Bearbeitbarkeit und Resistenz gegen Fressen sowie Kolbenring hieraus | |
| DE60027355T2 (de) | Selbstschmierendes Kolbenringmaterial für Verbrennungsmotoren und Kolbenring | |
| DE19629970C1 (de) | Gußeisenlegierung für die Herstellung von Kolbenringen von Verbrennungskraftmaschinen | |
| EP2052096B1 (fr) | Segment de piston en acier | |
| EP1143025A1 (fr) | Segment de piston et méthode de fabrication | |
| DE4001392A1 (de) | Nockenwelle und verfahren zu deren herstellung | |
| DE102006024414B4 (de) | Kolbenringe und Zylinderlaufbuchsen | |
| DE69909940T2 (de) | Teile aus martensitischem rostfreiem Stahl und Verfahren zu ihrer Herstellung |
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): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE |
|
| AX | Request for extension of the european patent |
Free format text: LT PAYMENT 951019;SI PAYMENT 951019 |
|
| RAX | Requested extension states of the european patent have changed |
Free format text: LT PAYMENT 951019;SI PAYMENT 951019 |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE |
|
| AX | Request for extension of the european patent |
Free format text: LT PAYMENT 951019;SI PAYMENT 951019 |
|
| 17P | Request for examination filed |
Effective date: 19970124 |
|
| 17Q | First examination report despatched |
Effective date: 19971001 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
| 18R | Application refused |
Effective date: 19990218 |