EP1122331A1 - Procédé pour la nitruration et/ou carbonitruration d' acier fortement allié - Google Patents
Procédé pour la nitruration et/ou carbonitruration d' acier fortement allié Download PDFInfo
- Publication number
- EP1122331A1 EP1122331A1 EP00102359A EP00102359A EP1122331A1 EP 1122331 A1 EP1122331 A1 EP 1122331A1 EP 00102359 A EP00102359 A EP 00102359A EP 00102359 A EP00102359 A EP 00102359A EP 1122331 A1 EP1122331 A1 EP 1122331A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- workpieces
- ammonia
- gas atmosphere
- temperature
- nitriding
- 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
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005121 nitriding Methods 0.000 title claims description 30
- 229910000831 Steel Inorganic materials 0.000 title description 6
- 239000010959 steel Substances 0.000 title description 6
- 238000005256 carbonitriding Methods 0.000 title 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 63
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 239000007800 oxidant agent Substances 0.000 claims abstract description 15
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 6
- 239000001569 carbon dioxide Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 claims description 4
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 2
- 229930195733 hydrocarbon Natural products 0.000 claims description 2
- 150000002430 hydrocarbons Chemical class 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 238000010791 quenching Methods 0.000 claims description 2
- 239000000956 alloy Substances 0.000 abstract description 7
- 229910045601 alloy Inorganic materials 0.000 abstract description 6
- 150000004767 nitrides Chemical class 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 13
- 239000012495 reaction gas Substances 0.000 description 7
- 239000002344 surface layer Substances 0.000 description 4
- 239000011651 chromium Substances 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 238000002161 passivation Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 229910021398 atomic carbon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910001337 iron nitride Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 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
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 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
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 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
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Images
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
- C23C8/06—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
- C23C8/08—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 only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
-
- 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 heat treatment of metallic Workpieces, especially for nitriding or nitrocarburizing alloyed Ferrous materials, such as higher alloy steels.
- the invention further relates on the use of a device for performing such a method.
- thermochemical heat treatment To create defined workpiece properties, such as a high one Wear resistance or sufficient corrosion resistance metallic workpieces are subjected to a thermochemical heat treatment.
- the result of the heat treatment is, for example, nitriding or nitrocarburizing Enriching the edge layer of the workpieces with nitrogen and / or Carbon in order to achieve the required mechanical and to impart chemical properties on the surface and in the edge area.
- the surface layer is enriched with nitrogen by the ammonia (NH 3 ) contained in a reaction gas at temperatures of generally over 500 ° C under the catalytic effect of the surface of the workpieces to be nitrided breaks down into nitrogen (N) and hydrogen (H).
- the ammonia molecule is adsorbed and gradually degraded on the workpiece surface, releasing the required nitrogen in atomic form and making it available for solution in iron and for the formation of iron nitride (Fe x N).
- the surface layer is simultaneously enriched with carbon.
- Atomic carbon (C) diffuses in an analogous manner through the workpiece surface into the boundary layer.
- the surface layer which, in addition to hexagonal ⁇ -nitride (Fe 2-3 N), also face-centered cubic ⁇ '-nitride (Fe 4 N) and also nitrides of nitride-forming alloy elements, such as chromium, molybdenum, manganese, titanium, niobium, tungsten, vanadium or aluminum nitride.
- the invention has for its object to provide a method for the heat treatment of metallic workpieces, in which a largely uniform nitriding layer can be achieved even with workpieces consisting of higher alloyed iron materials.
- Such a procedure embraces the surprising finding that a largely uniform nitriding layer can be achieved if the Workpieces before the actual heat treatment in process step d, for example, nitriding or nitrocarburizing, initially only in one ammonia-containing gas atmosphere warmed and then in an additional one Gas atmosphere containing oxidizing agent to the treatment temperature,
- the nitriding temperature, heated and then for a certain Duration may be kept at this temperature with the result that possibly in the case of high-alloy materials, existing passive layers are eliminated or something that be converted into a uniform diffusion of nitrogen into the Material is favored.
- the temperature at which in each Process steps is heated, and the length of time for which the workpieces in the respective gas atmospheres are based on the Composition of the reaction gas and the material to be treated Workpieces and the desired treatment success.
- the ratio of the amounts of ammonia and the oxidizing agent in the gas atmosphere is expediently between 1: 1 and 5: 1 if air is used as the oxidizing agent and between 1: 0.1 and 1: 1 if carbon dioxide, water vapor or nitrogen dioxide Oxidizing agents are used.
- a particularly advantageous procedure is also given when the Time period when the workpieces are kept in an ammonia or Ammonia and the carbon-donating gas atmosphere in Dependence on the desired thickness of the surface layer to be enriched is chosen.
- Procedural management may also be useful as carbon donor substance carbon dioxide, carbon monoxide or Hydrocarbons can be used individually or as a mixture.
- the workpieces in one reducing or neutral gas atmosphere for example from an endogas or nitrogen, or in a liquid quenching medium Room temperature can be cooled to an economically beneficial Ensure procedure.
- the first workpiece sample shown in FIG. 1 was preheated to a temperature of approximately 450 ° C. in an endogas-containing gas atmosphere and then in a reaction gas consisting of 50 vol.% Ammonia (NH 3 ) and 50 vol.% Endogas the nitriding temperature of approx. 580 ° C warmed. After approximately 240 minutes, during which the workpiece sample was exposed to the gas atmosphere at this temperature, the workpiece sample was cooled to room temperature in an endogenous gas atmosphere.
- a reaction gas consisting of 50 vol.% Ammonia (NH 3 ) and 50 vol.% Endogas the nitriding temperature of approx. 580 ° C warmed.
- the second workpiece sample shown in Fig. 2 was first preheated in an ammonia-containing gas atmosphere to a temperature of about 450 ° C and then in an ammonia-containing reaction gas, the air as an oxidizing agent in a ratio of 3.5 (ammonia): 1 (air ) was added, heated to the nitriding temperature of approx. 580 ° C. The workpiece sample was then held at this temperature and in this gas atmosphere for a period of about 1.5 hours. The gas atmosphere was then exchanged and the workpiece sample was exposed at 580 ° C.
- the comparison of the micrographs shown in the drawing shows that the 1, structure of the first produced by conventional nitriding Workpiece sample in the range from 0 ⁇ m to 40 ⁇ m from the edge uneven nitriding layer, while that after the last Methodically generated nitriding layer of the second workpiece sample is evenly formed.
- Iron materials such as stainless steels
- their high corrosion resistance is inextricably linked to surface passivation, on proportionate achieve better treatment results in a simple way.
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)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE50001540T DE50001540D1 (de) | 2000-02-04 | 2000-02-04 | Verfahren zum Nitrieren und/oder Nitrocarburieren von höher legierten Stählen |
| EP00102359A EP1122331B1 (fr) | 2000-02-04 | 2000-02-04 | Procédé pour la nitruration et/ou carbonitruration d' acier fortement allié |
| AT00102359T ATE235581T1 (de) | 2000-02-04 | 2000-02-04 | Verfahren zum nitrieren und/oder nitrocarburieren von höher legierten stählen |
| US09/562,695 US6328819B1 (en) | 2000-02-04 | 2000-04-28 | Method and use of an apparatus for the thermal treatment, in particular nitriding treatment, of metal workpieces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP00102359A EP1122331B1 (fr) | 2000-02-04 | 2000-02-04 | Procédé pour la nitruration et/ou carbonitruration d' acier fortement allié |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1122331A1 true EP1122331A1 (fr) | 2001-08-08 |
| EP1122331B1 EP1122331B1 (fr) | 2003-03-26 |
Family
ID=8167773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00102359A Expired - Lifetime EP1122331B1 (fr) | 2000-02-04 | 2000-02-04 | Procédé pour la nitruration et/ou carbonitruration d' acier fortement allié |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6328819B1 (fr) |
| EP (1) | EP1122331B1 (fr) |
| AT (1) | ATE235581T1 (fr) |
| DE (1) | DE50001540D1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014002120A1 (fr) * | 2012-06-26 | 2014-01-03 | Cavina Fulvio Fabrizio | Procédé et usine de traitement antioxydant de surfaces de pièces en acier |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6929757B2 (en) * | 2003-08-25 | 2005-08-16 | General Motors Corporation | Oxidation-resistant magnetorheological fluid |
| US7622197B2 (en) * | 2006-11-20 | 2009-11-24 | Ferroxy-Aled, Llc | Seasoned ferrous cookware |
| ITMI20110366A1 (it) * | 2011-03-10 | 2012-09-11 | Sol Spa | Procedimento per il trattamento di acciai. |
| RU2519356C2 (ru) * | 2012-05-24 | 2014-06-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский автомобильно-дорожный государственный технический университет (МАДИ)" | Способ циклического газового азотирования штампов из сталей для горячего деформирования |
| DE102013226090A1 (de) | 2013-12-16 | 2015-06-18 | Robert Bosch Gmbh | Verfahren zum Gasnitrocarburieren |
| DE102013226091A1 (de) | 2013-12-16 | 2015-06-18 | Robert Bosch Gmbh | Zylindertrommel einer hydrostatischen Axialkolbenmaschine mit einer Verschleißschutzschicht |
| DE102016221891A1 (de) | 2016-11-08 | 2018-05-09 | Robert Bosch Gmbh | Verfahren zur Wärmebehandlung eines aus einem hochlegierten Stahl bestehenden Werkstücks |
| JP6930738B2 (ja) * | 2018-08-03 | 2021-09-01 | 錦見鋳造株式会社 | 調理器具の製造方法 |
| EP4018010A1 (fr) | 2019-08-23 | 2022-06-29 | Elos Medtech Pinol A/S | Durcissement de surface pour implant dentaire |
| JP7753196B2 (ja) | 2019-08-23 | 2025-10-14 | エロス・メドテック・パイノール・エー／エス | チタンの低温硬化 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD119822A1 (fr) * | 1975-06-20 | 1976-05-12 | ||
| US4131492A (en) * | 1976-04-08 | 1978-12-26 | Nissan Motor Company, Ltd. | Steel article having a nitrided and partly oxidized surface and method for producing same |
| US4496401A (en) * | 1981-10-15 | 1985-01-29 | Lucas Industries | Corrosion resistant steel components and method of manufacture thereof |
| GB2153855A (en) * | 1984-01-27 | 1985-08-29 | Procedyne Corp | Stainless steel case hardening process |
| EP0655512A1 (fr) * | 1993-11-18 | 1995-05-31 | Ipsen Industries International Gesellschaft Mit Beschränkter Haftung | Procédé pour la formation de couches d'oxydes unitaires sur des substrats métalliques et dispositif pour réaliser le procédé |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1351234A (en) * | 1970-07-21 | 1974-04-24 | Nissan Motor | Process for forming a soft nitride layer in a metal surface |
| FR2524006B1 (fr) * | 1982-03-23 | 1985-10-11 | Air Liquide | Procede de durcissement superficiel de pieces metalliques |
| US5037491A (en) * | 1986-02-28 | 1991-08-06 | Fox Patrick L | Shallow case hardening and corrosion inhibition process |
| DE3718240C1 (de) * | 1987-05-30 | 1988-01-14 | Ewald Schwing | Verfahren zur Waermebehandlung von metallischen Werkstuecken in einer gasdurchstroemten Wirbelschicht |
-
2000
- 2000-02-04 EP EP00102359A patent/EP1122331B1/fr not_active Expired - Lifetime
- 2000-02-04 DE DE50001540T patent/DE50001540D1/de not_active Expired - Lifetime
- 2000-02-04 AT AT00102359T patent/ATE235581T1/de active
- 2000-04-28 US US09/562,695 patent/US6328819B1/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD119822A1 (fr) * | 1975-06-20 | 1976-05-12 | ||
| US4131492A (en) * | 1976-04-08 | 1978-12-26 | Nissan Motor Company, Ltd. | Steel article having a nitrided and partly oxidized surface and method for producing same |
| US4496401A (en) * | 1981-10-15 | 1985-01-29 | Lucas Industries | Corrosion resistant steel components and method of manufacture thereof |
| GB2153855A (en) * | 1984-01-27 | 1985-08-29 | Procedyne Corp | Stainless steel case hardening process |
| EP0655512A1 (fr) * | 1993-11-18 | 1995-05-31 | Ipsen Industries International Gesellschaft Mit Beschränkter Haftung | Procédé pour la formation de couches d'oxydes unitaires sur des substrats métalliques et dispositif pour réaliser le procédé |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014002120A1 (fr) * | 2012-06-26 | 2014-01-03 | Cavina Fulvio Fabrizio | Procédé et usine de traitement antioxydant de surfaces de pièces en acier |
Also Published As
| Publication number | Publication date |
|---|---|
| DE50001540D1 (de) | 2003-04-30 |
| ATE235581T1 (de) | 2003-04-15 |
| EP1122331B1 (fr) | 2003-03-26 |
| US6328819B1 (en) | 2001-12-11 |
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