EP0812929B1 - Verfahren zum Nitrieren und/oder Nitrocarburieren metallischer Werkstücke - Google Patents
Verfahren zum Nitrieren und/oder Nitrocarburieren metallischer Werkstücke Download PDFInfo
- Publication number
- EP0812929B1 EP0812929B1 EP96109451A EP96109451A EP0812929B1 EP 0812929 B1 EP0812929 B1 EP 0812929B1 EP 96109451 A EP96109451 A EP 96109451A EP 96109451 A EP96109451 A EP 96109451A EP 0812929 B1 EP0812929 B1 EP 0812929B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nitriding
- furnace
- atmosphere
- precarburisation
- nitrocarburising
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005121 nitriding Methods 0.000 title claims abstract description 27
- 238000005256 carbonitriding Methods 0.000 title abstract 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 17
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 24
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 6
- 239000011651 chromium Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 5
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 4
- 238000002161 passivation Methods 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 229910000851 Alloy steel Inorganic materials 0.000 abstract 1
- 239000010935 stainless steel Substances 0.000 abstract 1
- 238000005255 carburizing Methods 0.000 description 11
- 238000006396 nitration reaction Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000004992 fission Effects 0.000 description 2
- 229910000480 nickel oxide Inorganic materials 0.000 description 2
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical class [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910000669 Chrome steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- UOUJSJZBMCDAEU-UHFFFAOYSA-N chromium(3+);oxygen(2-) Chemical class [O-2].[O-2].[O-2].[Cr+3].[Cr+3] UOUJSJZBMCDAEU-UHFFFAOYSA-N 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/02—Pretreatment of the material to be coated
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/34—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in more than one step
Definitions
- the invention relates to a method for nitriding or nitrocarburizing Workpieces made of alloyed steels, especially corrosion-resistant Steels with more than 13% by weight of chromium, preferably in a gaseous form ammonia-containing nitriding or nitrocarburizing atmosphere, in which the Workpieces are previously pretreated.
- DD-A-296 967 also describes a process for the pretreatment of Iron material surfaces are known, in which the nickel or chromium oxides passivated surfaces by a mixture of derivatives of Melamins and carbonates and / or hydrocarbonates are activated. This known method is also from the point of view of environmental protection problematic and requires controlled and complex disposal of waste.
- US Pat. No. 2,851,387 discloses a process for the depassivation of high chromium-containing steels prior to nitriding, in which fluorocarbons are added during the heating of the furnace in the presence of an NH 3 atmosphere. This is intended to reduce the formation of dioxide on the workpiece surface and to prepare the workpiece for the nitriding process. With this known method, a depassivation of the surface can be achieved.
- the invention is based on the object , while avoiding the disadvantages mentioned, of improving a method of the type described at the outset in such a way that nitriding layers or nitrocarburizing layers with an increased layer thickness are achieved with the same nitriding or nitrocarburizing conditions, which are the same have high uniformity.
- the object is achieved in that the workpieces in front nitriding or nitrocarburizing in a heated furnace with the addition of a Alcohol, especially methanol, as a cleavable carbon carrier Be subjected to pre-carburizing as a pre-treatment.
- a Alcohol especially methanol
- the process temperature prevailing in the furnace causes it to enter the furnace atmosphere entered carbon carrier with formation of intermediate radicals cleaved, which consists of chromium and nickel oxides, the passive layer which inhibits nitration or nitrocarburization Surprisingly depassivating workpieces and thus the workpiece surface ideal for the subsequent nitration or nitrocarburization to prepare.
- intermediate radicals cleaved which consists of chromium and nickel oxides
- the passive layer which inhibits nitration or nitrocarburization
- the pre-carburization in the Nitrocarburizing temperature especially at temperatures between 500 ° C and 600 ° C, because on the one hand at these temperatures the Alcohols are slow and incomplete with increased formation of Intermediate radicals are split and on the other hand the furnace for the subsequent nitriding or nitrocarburizing not cooled again or must be conditioned.
- the ratio of methanol and nitrogenous gas in the pre-carburizing atmosphere about 1: 1 is advantageously. So the uses of Gas mixtures for the pre-carburization of 50% NH3 and 50% methanol pre-carburizing, preferably at temperatures of around 570 ° C.
- the duration of the pre-carburization depending on this, it is preferably between 10 minutes and 70 minutes between 30 minutes and 60 minutes. It is advisable that the carbon carrier in the nitriding or nitrocarburizing cycle - and not in a separate process - added to the furnace atmosphere is, the furnace atmosphere necessary for the pre-carburizing after the Pre-carburize as quickly as possible, for example by opening the furnace door removed from the oven without interrupting the cycle.
- Such a sudden Change of the furnace atmosphere from the pre-carburization to the subsequent one Nitration or nitrocarburization is advantageous so that the Pre-carburizing carbon products produced by the for the Nitriding or nitrocarburizing does not require the ammonia to be split can hinder or delay.
- the method according to the invention is preferably used on high-alloys Steels with a high tendency to surface passivation, such as Workpieces made of 42CrMo4 or X40CrMoV51, however, the application on low-alloy steels, as C15 should not be excluded, because advantageous effects can also be achieved there with the teaching of the invention.
- the metallic workpieces to be treated are placed in a heat treatment furnace and this is then heated to the necessary process temperature for the nitration or nitrocarburization.
- the fissile carbon carrier is introduced into the furnace atmosphere.
- the carbon carrier is split with the formation of intermediate radicals.
- These fission products activate the passive layer of the metallic workpieces consisting of oxides, in particular chromium and / or nickel oxides.
- the overall effect of this furnace atmosphere created by the addition of the fissile carbon carrier consists on the one hand in the depassivation of the workpiece surfaces and on the other hand in a very strong and brief carburizing effect due to the split carbon carrier.
- This brief carburization is associated with only a small amount of carbon transferred, which is not sufficient for carburizing hardening, but has the effect that, in the subsequent nitration or nitrocarburization, the nitrogen obtained as a result of the ammonia splitting of the nitriding or nitrocarburizing atmosphere is uniform and is quickly absorbed by the workpiece surface to form the desired boundary layers.
- the pre-carburizing which preferably lasts 30 to 60 minutes
- the pre-carburizing atmosphere is removed from methane and methane fission products and replaced by the nitriding or nitrocarburizing atmosphere by opening the furnace door or by flushing with, for example, N 2 , preferably at a constant temperature.
- the nitration or nitrocarburization is then carried out in a manner known per se.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Description
Voraufkohlung in Methanol + Ammoniak | Nitrocarburieren | Dicke der Verbindungsschicht (µm) | Diffusionsschicht (µm) | ||||||
Behandl. Nummer | T (min) | T (°C) | T(h) | T(°C) | Gasmischung | C15 | 42CrMo4 | X40Cr MoV51 | X90Cr MoV18 |
1 | --- | --- | 6 | 570 | 50% NH3 + 50% Endogas | 9-15 | 6-8 | 4-6 | 0-40 |
2 | 60 | 570 | 5 | 570 | 50% NH3 + 50% Endogas | 18-25 | 7-9 | 5-7 | 60-70 |
3 | 30 | 580 | 6 | 580 | 50% NH3 + 5% CO2 (Rest N2) | 12-18 | 22-28 | 9-12 | 75-85 |
Claims (8)
- Verfahren zum Nitrieren oder Nitrocarburieren von Werkstücken aus legierten Stählen, insbesondere korrosionsbeständigen Stählen mit größer 13 Gew.% Chrom, in einer gasförmigen vorzugsweise ammoniakhaltigen Nitrier- bzw. Nitrocarburieratmosphäre, bei dem die Werkstücke zuvor einer Vorbehandlung unterworfen werden,
dadurch gekennzeichnet,
daß die Werkstücke vor dem Nitrieren bzw. Nitrocarburieren im aufgeheizten Ofen unter Zugabe eines Alkohols, insbesondere Methanol, als spaltbarem Kohlenstoff-Träger einer Voraufkohlung als Vorbehandlung unterzogen werden. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Voraufkohlung bei Nitrier- bzw. Nitrocarburiertemperatur, insbesondere bei Temperaturen zwischen 500° C und 600° C durchgeführt wird.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Verhältnis von Methanol und stickstoffhaltigem Gas in der Voraufkohlungs-Atmosphäre etwa 1:1 beträgt, wobei die stickstoffhaltige Atmosphäre vorzugsweise aus Ammoniak besteht.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Voraufkohlung bei Temperaturen von etwa 570 bis 580° C durchgeführt wird.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Kohlenstoff-Träger während der Aufheizphase des Ofens in die Ofenatmosphäre gegeben wird.
- Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß der Kohlenstoff-Träger im Zyklus der Nitrierung oder Nitrocarburierung - und nicht in einem getrennten Vorgang - der Ofenatmosphäre zugegeben wird, wobei die für die Voraufkohlung notwendige Ofenatmosphäre nach dem Voraufkohlen möglichst schnell, zum Beispiel durch Öffnen der Ofentür, aus dem Ofen ohne Zyklusunterbrechung entfernt wird.
- Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Dauer der Voraufkohlung zwischen 10 Minuten und 70 Minuten, vorzugsweise zwischen 30 Minuten und 60 Minuten beträgt.
- Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß es an hochlegierten Stählen mit großer Neigung zur Oberflächenpassivierung, wie Werkstücken aus 42CrMo4 oder X40CrMoV51 angewendet wird.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96109451A EP0812929B1 (de) | 1996-06-13 | 1996-06-13 | Verfahren zum Nitrieren und/oder Nitrocarburieren metallischer Werkstücke |
ES96109451T ES2142519T3 (es) | 1996-06-13 | 1996-06-13 | Procedimiento para la nitruracion y/o la nitrocarburacion de piezas metalicas. |
AT96109451T ATE188513T1 (de) | 1996-06-13 | 1996-06-13 | Verfahren zum nitrieren und/oder nitrocarburieren metallischer werkstücke |
DE59604119T DE59604119D1 (de) | 1996-06-13 | 1996-06-13 | Verfahren zum Nitrieren und/oder Nitrocarburieren metallischer Werkstücke |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96109451A EP0812929B1 (de) | 1996-06-13 | 1996-06-13 | Verfahren zum Nitrieren und/oder Nitrocarburieren metallischer Werkstücke |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0812929A1 EP0812929A1 (de) | 1997-12-17 |
EP0812929B1 true EP0812929B1 (de) | 2000-01-05 |
Family
ID=8222892
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96109451A Expired - Lifetime EP0812929B1 (de) | 1996-06-13 | 1996-06-13 | Verfahren zum Nitrieren und/oder Nitrocarburieren metallischer Werkstücke |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0812929B1 (de) |
AT (1) | ATE188513T1 (de) |
DE (1) | DE59604119D1 (de) |
ES (1) | ES2142519T3 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1131338C (zh) * | 1998-06-15 | 2003-12-17 | 张秋英 | 齿轮二段碳氮共渗工艺 |
DE10118494C2 (de) * | 2001-04-04 | 2003-12-11 | Aichelin Gesmbh Moedling | Verfahren zur Niederdruck-Carbonitrierung von Stahlteilen |
CN112159951B (zh) * | 2020-10-26 | 2022-12-09 | 杭州汽轮动力集团股份有限公司 | 一种汽轮机钛合金叶片的防水蚀层的制备工艺 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH163070A (fr) * | 1932-07-18 | 1933-07-31 | Thos Firth & John Brown Limite | Procédé de durcissement en surface d'alliages d'acier inoxydables et alliage d'acier inoxydable, durci en surface par ce procédé. |
US2851387A (en) * | 1957-05-08 | 1958-09-09 | Chapman Valve Mfg Co | Method of depassifying high chromium steels prior to nitriding |
US3140205A (en) * | 1962-07-26 | 1964-07-07 | Chapman Division Crane Co | Process for nitriding steels of the low, medium and high alloy types by first removing the passive oxide surface film |
DE1933439A1 (de) * | 1968-07-01 | 1970-01-15 | Gen Electric | Nitrierverfahren |
SU681113A1 (ru) * | 1977-10-06 | 1979-08-28 | Предприятие П/Я А-7697 | Способ азотировани инструментальных сталей |
JPS6059060A (ja) * | 1983-09-09 | 1985-04-05 | Fujitsu Ltd | 浸炭窒化の炉気制御方法 |
JPH0713294B2 (ja) * | 1985-08-07 | 1995-02-15 | マツダ株式会社 | クロム含有鋼部材の浸炭窒化処理方法 |
JP2724456B2 (ja) * | 1987-02-25 | 1998-03-09 | マツダ株式会社 | 鋼部材の浸炭窒化方法 |
JPH01201458A (ja) * | 1988-02-04 | 1989-08-14 | Sanyo Special Steel Co Ltd | 高クロム鋼部品の浸炭方法 |
JP3196304B2 (ja) * | 1992-03-12 | 2001-08-06 | マツダ株式会社 | クロム含有鋼部材の浸炭焼入れ方法 |
-
1996
- 1996-06-13 DE DE59604119T patent/DE59604119D1/de not_active Expired - Fee Related
- 1996-06-13 ES ES96109451T patent/ES2142519T3/es not_active Expired - Lifetime
- 1996-06-13 EP EP96109451A patent/EP0812929B1/de not_active Expired - Lifetime
- 1996-06-13 AT AT96109451T patent/ATE188513T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ATE188513T1 (de) | 2000-01-15 |
ES2142519T3 (es) | 2000-04-16 |
DE59604119D1 (de) | 2000-02-10 |
EP0812929A1 (de) | 1997-12-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE3486037T2 (de) | Korrosionsgeschuetzte werkstuecke aus stahl und verfahren zu ihrer herstellung. | |
DE2417179A1 (de) | Verfahren zur aufkohlung hochlegierter staehle | |
DE3923999A1 (de) | Verfahren zum aufkohlen und vergueten von stahlteilen | |
DE2658174A1 (de) | Verfahren zum nitrierhaerten martensitischer staehle | |
DE2135763C3 (de) | 31 08 70 Japan 45 76202 Verfahren zur Behandlung von Eisen- und Stahlgegenstanden zur Bildung einer Nitrid schicht | |
DE3800838C1 (de) | ||
EP0627019B1 (de) | Verfahren zur thermochemisch-thermischen behandlung von einsatzstählen | |
DE102004053935B4 (de) | Verfahren zur Wärmebehandlung eines Bauteils aus einem durchhärtenden warmfesten Stahl und Bauteil aus einem durchhärtenden warmfesten Stahl | |
DE4327440C2 (de) | Verfahren zur thermochemisch-thermischen Behandlung von Einsatzstählen, Vergütungsstählen und Wälzlagerstählen | |
DE69619725T2 (de) | Verfahren zum Nitrieren von Stahl | |
EP0812929B1 (de) | Verfahren zum Nitrieren und/oder Nitrocarburieren metallischer Werkstücke | |
DE69103114T2 (de) | Schraube aus austenitischem rostfreien Stahl und Verfahren zu seiner Herstellung. | |
EP1333105B1 (de) | Verfahren zur Wärmebehandlung metallischer Werkstücke sowie wärmebehandeltes Werkstück | |
EP1122331B1 (de) | Verfahren zum Nitrieren und/oder Nitrocarburieren von höher legierten Stählen | |
DE2527026C3 (de) | Verfahren zum Herstellen eines Bauteils hoher Lebensdauer | |
DE2449237A1 (de) | Verfahren zur induktiven oberflaechenhaertung von verzahnten werkstuecken | |
DE10118029C1 (de) | Verfahren zur thermochemischen Vorbehandlung von metallischen Werkstücken und Anwendung des Verfahrens | |
EP0890656B1 (de) | Verfahren zum Aufsticken der Randschicht metallischer Werkstücke | |
WO2018188686A1 (de) | Carbonitrieren von spanlos hergestellten wälzlagern | |
DE69802525T2 (de) | Verfahren zum kontinuierlichen herstellen von stahlband mit verbesserten oberflächeneigenschaften zum tiefziehen | |
EP0908530B1 (de) | Blatt für eine Säge oder ein Messer und Herstellungsverfahren | |
EP0545069A1 (de) | Verfahren zur Behandlung von Stählen und Refraktärmetallen | |
EP0034761B1 (de) | Verfahren zur Oberflächenvergütung von Maschinenteilen und Schneidwerkzeugen aus Eisenlegierungen | |
DE2947799A1 (de) | Verfahren zum lokalen schutz von eisen- und stahlteilen bei waermebehandlungen | |
DD215335A1 (de) | Verfahren zur einstellung rand-kern-spezifischer eigenschaftskombinationen in eisenwerkstoffen |
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: A1 Designated state(s): AT CH DE ES FR GB IT LI |
|
17P | Request for examination filed |
Effective date: 19980528 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
17Q | First examination report despatched |
Effective date: 19990430 |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT CH DE ES FR GB IT LI |
|
REF | Corresponds to: |
Ref document number: 188513 Country of ref document: AT Date of ref document: 20000115 Kind code of ref document: T |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: NV Representative=s name: E. BLUM & CO. PATENTANWAELTE Ref country code: CH Ref legal event code: EP |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 20000106 |
|
REF | Corresponds to: |
Ref document number: 59604119 Country of ref document: DE Date of ref document: 20000210 |
|
ITF | It: translation for a ep patent filed | ||
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2142519 Country of ref document: ES Kind code of ref document: T3 |
|
ET | Fr: translation filed | ||
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 | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20030530 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20030611 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20030617 Year of fee payment: 8 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040613 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040614 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20040613 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20050228 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050613 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20040614 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 20060615 Year of fee payment: 11 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 20060616 Year of fee payment: 11 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20060815 Year of fee payment: 11 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PFA Owner name: IPSEN INTERNATIONAL GMBH Free format text: IPSEN INTERNATIONAL GMBH#FLUTSTRASSE 78#47533 KLEVE (DE) -TRANSFER TO- IPSEN INTERNATIONAL GMBH#FLUTSTRASSE 78#47533 KLEVE (DE) |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070613 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070630 Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080101 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070630 |