EP2203575B1 - Procédé de carburation de pièces, et son utilisation - Google Patents

Procédé de carburation de pièces, et son utilisation Download PDF

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Publication number
EP2203575B1
EP2203575B1 EP08804176.9A EP08804176A EP2203575B1 EP 2203575 B1 EP2203575 B1 EP 2203575B1 EP 08804176 A EP08804176 A EP 08804176A EP 2203575 B1 EP2203575 B1 EP 2203575B1
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EP
European Patent Office
Prior art keywords
hydrocarbon
carburizing
workpiece
hydrocarbons
carburized
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Not-in-force
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EP08804176.9A
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German (de)
English (en)
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EP2203575A2 (fr
Inventor
Lothar Foerster
Jochen Schwarzer
Thomas Waldenmaier
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • 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
    • C23C8/20—Carburising
    • C23C8/22—Carburising 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
    • C23C8/08—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
    • C23C8/20—Carburising
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/166—Selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9038—Coatings

Definitions

  • the invention relates to a method for carburizing workpieces made of steel with external and internal surfaces, according to the preamble of claim 1. Furthermore, the invention relates to a use of the method.
  • Processes for carburizing steel workpieces are used to harden the surface of the workpieces.
  • the edge layer of a low-carbon steel is enriched with carbon for workpieces made of steel, before hardening of the workpiece takes place.
  • the carburizing takes place for example as Unterdruckaufkohlen.
  • the workpieces are introduced in a vacuum oven having a process chamber for carrying out the carburizing.
  • the process chamber is traversed by a carbon-emitting process gas to enrich the edge region of the workpieces with carbon.
  • the process gases are generally pulsed during the individual process steps, the process chamber being alternately evacuated and / or subjected to nitrogen purge.
  • Such a method is for example off DE-A 102 09 382 known.
  • the volume flow of the carburizing medium is regulated and controlled in such a way during a pressure pulse that a uniform carburization of a workpiece to be carburized is achieved.
  • the surface of the workpiece may have different hardnesses. This is for example like in DE-A 35 36 452 described in fuel injectors for internal combustion engines of the case.
  • the areas of the valve seat has a lower hardness than the outer area.
  • the different hardness is achieved in that, after carburizing or after nitriding or nitrocarburizing, a partial layer of the carburized or nitrided or nitrocarburized outer wall region is first removed before the workpiece is hardened.
  • the WO 2004/035853 A1 shows a method of carburizing steel workpieces having external and internal surfaces, wherein the workpiece is maintained at a temperature in the range of 850 to 1050 ° C in a gaseous hydrocarbon-containing atmosphere. At least two different gaseous hydrocarbons are used.
  • WO 2007/062008 A2 shows a carburizing process of metallic components using various gas mixtures of hydrocarbons for carburizing. It also describes a mixture of a saturated and an unsaturated hydrocarbon gas.
  • the WO 87/00889 A1 shows a nozzle body of injectors, which is carburized for the purpose of high hardness.
  • inventive method is specified in claim 1.
  • Particular embodiments of the method according to the invention are specified in the claims 2-8.
  • a use of the method according to the invention is specified in claim 9.
  • a reduction in the carburization of internal surfaces is achieved, in particular, by the fact that the duration of a carburizing pulse in which the workpiece is held in the atmosphere containing the gaseous hydrocarbon is not more than 30 seconds.
  • the duration of a carburizing pulse of a maximum of 30 seconds is particularly preferred when carburizing takes place under reduced pressure.
  • the gaseous hydrocarbon is injected into a furnace chamber in which the workpiece to be carburized is contained.
  • the furnace chamber is purged with an inert gas.
  • the oven chamber is purged, it is preferably nitrogen. Advantage of purging with nitrogen versus over the evacuation of the furnace chamber is that when flushing a faster removal of the gaseous hydrocarbon from the furnace chamber is possible.
  • pulses with a duration of less than 30 seconds As well as longer pulses.
  • the outer surface of the workpiece is carburized, and during the longer pulses, all surfaces of the workpiece are carburized. This leads to a weaker carburizing of the inner surfaces and a stronger carburizing of the outer surfaces.
  • the at least two different hydrocarbons are contained simultaneously in the atmosphere containing the gaseous hydrocarbon.
  • the different hydrocarbons are used successively.
  • the different gaseous hydrocarbons are contained simultaneously in the gaseous hydrocarbon-containing atmosphere, it is possible to expose the workpiece to be carburized in only one processing step of the gaseous hydrocarbon-containing atmosphere.
  • a plurality of carburizing pulses are performed.
  • the carburizing pulses allow the material properties to be set even more precisely than by the simultaneous use of the at least two different hydrocarbons.
  • the partial pressure of the hydrocarbon in the gaseous hydrocarbon-containing atmosphere is different for at least two successive carburizing pulses. Due to the different partial pressure of the hydrocarbon in the gaseous hydrocarbon It is also possible to carburize external surfaces more strongly than interior surfaces. The greater carburization of the outer surfaces is achieved by increasing the partial pressure of the hydrocarbon. Accordingly, by lowering the partial pressure of the hydrocarbon in the atmosphere containing the gaseous hydrocarbon, internal surfaces are less strongly carburized.
  • the lowering of the partial pressure of the hydrocarbon in the atmosphere containing the gaseous hydrocarbon can be carried out, for example, by admixing an inert gas at a constant total pressure.
  • a suitable inert gas is for example nitrogen.
  • Other suitable inert gases are helium or argon. However, nitrogen is particularly preferred as the inert gas.
  • the partial pressure by adding another hydrocarbon at a constant pressure. This is possible in particular when different hydrocarbons are to be used for carburizing.
  • the lowering of the partial pressure is preferably carried out in this case with a hydrocarbon, by which particular external surfaces of the workpiece are carburized.
  • the hydrocarbon is unsaturated.
  • the hydrocarbon is diunsaturated.
  • a diunsaturated hydrocarbon penetrates even better, e.g. into holes as a monounsaturated hydrocarbon.
  • saturated hydrocarbons it is also possible to carburize internal surfaces of the workpiece with unsaturated hydrocarbons, in particular diunsaturated hydrocarbons.
  • unsaturated hydrocarbons in particular diunsaturated hydrocarbons.
  • At least one hydrocarbon is saturated and at least one hydrocarbon is unsaturated or preferably at least one Hydrocarbon diunsaturated and at least one hydrocarbon monounsaturated.
  • the saturated or monounsaturated hydrocarbon so mainly external surfaces of the workpiece are carburized and by the single or preferably diunsaturated hydrocarbon both external and internal surfaces.
  • the partial pressure of the unsaturated or monounsaturated hydrocarbon makes it possible to adjust the degree of carburization of the internal surfaces.
  • carburizing of the workpiece is carried out with carburizing pulses, so it is possible for a duration of carburizing pulses of a maximum of 30 seconds, regardless of the hydrocarbon used, especially carburizing external surfaces.
  • carburizing of the outer surfaces is promoted and carburizing of the inner surfaces is prevented when saturated hydrocarbons are used.
  • unsaturated, preferably diunsaturated hydrocarbons it is preferable to use unsaturated, preferably diunsaturated hydrocarbons in combination with carburizing pulses whose duration exceeds 30 seconds.
  • the saturated hydrocarbon used for the carburization is preferably a C 1 to C 6 alkane.
  • the saturated hydrocarbon is particularly preferably methane, ethane or propane.
  • the unsaturated hydrocarbon is preferably a C 2 to C 6 alkene or C 2 to C 6 alkyne. Particularly preferably, the unsaturated hydrocarbon is ethene or ethyne or a mixture thereof.
  • ethyne as a hydrocarbon for carburizing workpieces made of steel, that this good carburization of internal surfaces, for example, allows for drilling.
  • the method according to the invention makes it possible, for example by using different hydrocarbons and / or short carburizing pulses, to carburize external surfaces of the workpiece more strongly than internal surfaces.
  • the steel workpiece After carburizing, the steel workpiece is usually hardened. For this purpose, there is a quenching of the workpiece, in which the workpiece, which has the quenching temperature is suddenly cooled. Quench temperature is understood to mean the temperature at which a workpiece is quenched.
  • Quenching takes place, for example, in an oil bath. However, especially under vacuum carburizing, gas quenching is performed. This results in a higher retained austenite content in the more carburized areas.
  • the method is thus particularly suitable for the production of workpieces in which areas of greater hardness and areas with lower hardness are desired. Areas of lower hardness have a lower retained austenite content or have almost no retained austenite. This is particularly desirable where particularly high demands are placed on dimensional and dimensional stability. This is because the retained austenite is softer than martensite. In addition, a subsequent transformation of the retained austenite into martensite during operation leads to a change in the volume of the microstructure.
  • the method is used for carburizing a nozzle body of an injection valve, in particular a fuel injection valve.
  • a nozzle body comprises a region for a valve seat, a guide for a valve member and an outer surface.
  • the outer surface and the guide of the valve member are more strongly carburized and the area of the valve seat is lightly carburized. This results in the subsequent quenching that the outer surface and the guide for the valve member have a greater hardness than the region of the valve seat.
  • the nozzle body due to the different carburization of the nozzle body, a higher retained austenite content on the outer surface and the guidance of the valve member and a lower retained austenite content in the region of the valve member. Due to the low content of retained austenite in the region of the valve seat, the required high dimensional and dimensional stability requirements can be met here.
  • the high demands on dimensional and dimensional stability in the region of the valve seat are particularly due to the fact that at the high pressures, especially in self-igniting Combustion engines occur, a tight closure of the injection valve must be made possible so that no fuel can enter through the injection valve in the combustion chamber of the internal combustion engine when the injection valve is closed.
  • nozzle bodies for injection valves can be hardened by a vacuum carburization so that almost no residual austenite is present in the region of the valve seat, whereby the required dimensional and dimensional stability can be fulfilled while in the region of the guide of the valve member and on the outer surface the nozzle body, a maximum surface hardness is achieved with a correspondingly high content of retained austenite.
  • FIG. 1 are the pressure and temperature gradients as a function of time for the inventive method shown.
  • the process of carburizing steel workpieces is generally carried out under vacuum.
  • the pressure during the carburizing of the workpiece is generally in the range of 1 to 30 mbar.
  • the pressure is in the range of 4 to 10 mbar.
  • the time t is plotted on the abscissa 1, the temperature T on a first ordinate 3 and the pressure p on a second ordinate 5.
  • the workpiece in a first step 7, is heated to the carburizing temperature.
  • the carburizing temperature is generally in the range of 880 to 1050 ° C, preferably in the range of 900 to 1000 ° C.
  • the carburization temperature is the temperature at which the workpiece is exposed to a carburizing atmosphere.
  • the workpiece After heating to the operating temperature, the workpiece is warmed through in a first holding phase 9 to the carburizing temperature.
  • the carburizing temperature 11 is maintained substantially constant throughout the carburization process.
  • carburizing pulses 13 take place. Each carburizing pulse 13 is followed by a diffusion phase 15.
  • the partial pressure of the hydrocarbon used in the carburizing pulses 13 is 10 mbar.
  • the partial pressure of the hydrocarbon during the carburization pulses 13 is in the range from 1 to 30 mbar, preferably in the range from 4 to 10 mbar.
  • the process gas contains the hydrocarbon used for carburizing. Furthermore, it is possible that the process gas also contains inert constituents.
  • hydrocarbon preferably a C 2 to C 6 alkene or C 2 to C 6 alkyne, preferably ethene or ethyne
  • a mixture of a plurality of different hydrocarbons it is also possible to use saturated hydrocarbons, preferably C 1 -C 6 -alkanes, in addition to the unsaturated hydrocarbon.
  • saturated hydrocarbons are methane, ethane or propane.
  • first three carburizing pulses are performed. After the three carburizing pulses a longer diffusion phase takes place. After the longer diffusion phase 15 again three carburizing pulses 13 are performed.
  • the diffusion phases 15 may have the same length after each carburizing pulse 13 or for a diffusion phase 15 of different lengths to be carried out after each carburizing pulse 13.
  • the duration of the diffusion phases 15 is in each case selected such that the carbon content desired after the carburizing pulse 13 is set at the surface of the workpiece to be carburized.
  • the process gas that is, the hydrocarbon-containing gas
  • the oven chamber in which the carburizing is carried out, after each carburizing pulse 13 is purged with an inert gas. It is also possible that during the diffusion phase 15 at the same time a pumping out of the process gas and a purging of the chamber.
  • a pure hydrocarbon or hydrocarbon mixture is injected into the furnace chamber.
  • a mixture of hydrocarbons and inert gases it is also possible to use a mixture of hydrocarbons and inert gases.
  • Suitable inert gases are, for example, nitrogen and noble gases.
  • the same hydrocarbon or the same hydrocarbon mixture can be used in all carburizing pulses 13 or different hydrocarbons or hydrocarbon mixtures are used with different carburizing pulses 13.
  • any inert gas is suitable for purging the chamber after the carburizing pulses 13.
  • any inert gas is suitable for purging the chamber after the carburizing pulses 13.
  • the same inert gas is used for rinsing as that used during the carburizing pulses 13.
  • the last carburizing pulse 13 is adjoined by a final diffusion phase 17, the duration of which is selected so as to be on the surface of the workpiece to be carburized sets the desired carbon content.
  • the temperature of the workpiece can be lowered to hardening temperature. This is shown by reference numeral 19.
  • the hardening temperature is preferably in the range of 800 to 950 ° C, in particular in the range of 820 to 900 ° C.
  • the workpiece is hardened by quenching 21.
  • quenching for example, the workpiece is immersed in an oil bath. In the oil bath there is a sudden cooling of the workpiece. Preferably, however, a gas quench is performed.
  • an unsaturated hydrocarbon preferably ethene or ethyne, more preferably a diunsaturated hydrocarbon, especially ethyne
  • a mixture of saturated and unsaturated hydrocarbons for example Mixture of ethane and ethyne or preferably a mixture of mono- and diunsaturated hydrocarbons, in particular ethene and ethyne, or even saturated hydrocarbons use.
  • exterior surfaces of the workpiece are carburized with both the saturated and unsaturated hydrocarbons, while internal surfaces, for example, surfaces within bores are carburized primarily by the unsaturated hydrocarbon, especially a diunsaturated hydrocarbon.
  • the concentration of carbon on both interior surfaces and exterior surfaces is generally comparable.
  • the surface concentration on internal surfaces can also be controlled. The concentration depends on when a hydrocarbon is used for carburizing internal surfaces and how long it diffuses afterwards.
  • Suitable covering devices or covering means are, for example, masking pastes.
  • FIG. 2 a nozzle body of an injection valve is shown.
  • an injection port 33 is formed in a nozzle body 31 for a fuel injection valve.
  • fuel is injected into a combustion chamber of an internal combustion engine via the injection opening 33. So that fuel is injected only at desired times in the combustion chamber, the injection port 33 is closed by means of a valve member, not shown here.
  • the valve member is placed with a sealing edge in a valve seat 35.
  • the valve seat 35 is formed conically in the embodiment shown here.
  • valve member tightly seals the injection opening 33 even at the high fuel pressures occurring during the injection process, very high demands are placed on the dimensional stability of the valve seat 35.
  • the low carburization depth is achieved by the method according to the invention, in which internal surfaces, such as the valve seat 35, are only lightly carburized by using the short carburization pulses and / or the unsaturated hydrocarbons.
  • the outer surface 37 of the nozzle body 31 is strongly carburized to achieve greater hardness. Due to the greater hardness on the outer surface 37, the wear resistance is reduced by abrasion on the outer surface 37. It is also desired that the portion of the guide of the valve member 39 is carburized more, so as to minimize the wear and metal abrasion due to the friction due to the movement of the valve member.
  • the method according to the invention makes it possible to strongly carburize the guide of the valve member 35 and the outer surface 37 of the nozzle body 31 and to carburize the valve seat 35 only slightly. As a result, in the region of the valve seat 35, a low residual austenite content during curing, which follows the carburizing, achieved. In contrast, the retained austenite content on the outer surface 37 and in the region of the guide of the valve member 35 is higher.
  • the method according to the invention is also suitable, for example, for carburizing piston bores, i. long holes, which must have good dimensional and dimensional stability, in order to avoid a so-called “seizure", in which each inner surface is only slightly or not carburized and external surfaces are heavily carburized.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Claims (9)

  1. Procédé de carburation de pièces en acier comportant des surfaces situées à l'extérieur et à l'intérieur, dans lequel on maintient la pièce à une température dans la plage de 850 à 1050°C dans une atmosphère contenant de l'hydrocarbure gazeux, dans lequel on maintient la pièce en alternance pendant une impulsion de carburation (13) dans l'atmosphère contenant un hydrocarbure gazeux et pendant une phase de diffusion (15, 17) dans une atmosphère qui est exempte d'hydrocarbure, caractérisé en ce que l'on choisit la longueur de l'impulsion de carburation de telle manière que des surfaces de la pièce situées à l'extérieur soient plus fortement carburées que des surfaces situées à l'intérieur.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on maintient la pièce pendant au maximum 30 s dans l'atmosphère contenant l'hydrocarbure gazeux.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que lesdits au moins deux hydrocarbures différents sont contenus en même temps dans l'atmosphère contenant l'hydrocarbure gazeux.
  4. Procédé selon la revendication 1 ou 2, caractérisé en ce que, dans au moins deux impulsions de carburation successives (13), respectivement au moins un hydrocarbure différent est contenu dans l'atmosphère contenant des hydrocarbures gazeux.
  5. Procédé selon la revendication 1 ou 2, caractérisé en ce que, dans au moins deux impulsions de carburation successives (13), la pression partielle de l'hydrocarbure dans l'atmosphère contenant des hydrocarbures gazeux est différente.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'hydrocarbure contenu dans l'atmosphère gazeuse est insaturé, de préférence doublement insaturé.
  7. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que, lors de l'emploi d'au moins deux hydrocarbures différents, au moins un hydrocarbure est saturé et au moins un hydrocarbure est insaturé ou au moins un hydrocarbure est doublement insaturé et au moins un hydrocarbure est simplement insaturé.
  8. Procédé selon la revendication 6 ou 7, caractérisé en ce que l'hydrocarbure saturé est un alcane C2 à C6, de préférence le propane et l'hydrocarbure insaturé est un alcène C2 à C6 ou un alcyne C2 à C6, de préférence l'éthène, l'éthyne, le propyne ou un mélange de ceux-ci.
  9. Utilisation du procédé selon l'une quelconque des revendications 1 à 8 pour la carburation d'un corps d'ajutage (31) d'un injecteur, en particulier d'un injecteur de carburant, comprenant une zone pour un siège de soupape (35), un guide pour un élément de soupape (39) et une surface extérieure (37), de telle manière que la surface extérieure (37) et le guide pour l'élément de soupape (39) soient plus fortement carburés et que la zone du siège de soupape (35) soit faiblement carburée, la surface extérieure (37) et le guide pour l'élément de soupape (39) présentant ainsi une plus grande dureté que la zone du siège de soupape (35).
EP08804176.9A 2007-10-01 2008-09-15 Procédé de carburation de pièces, et son utilisation Not-in-force EP2203575B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007047074A DE102007047074A1 (de) 2007-10-01 2007-10-01 Verfahren zur Aufkohlung von Werkstücken sowie Verwendung
PCT/EP2008/062215 WO2009047084A2 (fr) 2007-10-01 2008-09-15 Procédé de carburation de pièces, et son utilisation

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EP2203575A2 EP2203575A2 (fr) 2010-07-07
EP2203575B1 true EP2203575B1 (fr) 2014-11-12

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US (1) US8828150B2 (fr)
EP (1) EP2203575B1 (fr)
JP (1) JP2010540777A (fr)
CN (1) CN101809184B (fr)
BR (1) BRPI0818290A2 (fr)
DE (1) DE102007047074A1 (fr)
WO (1) WO2009047084A2 (fr)

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JP6543208B2 (ja) * 2016-03-17 2019-07-10 株式会社日本テクノ ガス浸炭方法およびガス浸炭装置
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PL422596A1 (pl) * 2017-08-21 2019-02-25 Seco/Warwick Spółka Akcyjna Sposób nawęglania podciśnieniowego (LPC) elementów wykonanych ze stopów żelaza i innych metali
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CN113502449A (zh) * 2021-06-04 2021-10-15 中航力源液压股份有限公司 一种15Cr14Co12Mo5Ni2VW高强度不锈钢低压渗碳热处理方法
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EP2203575A2 (fr) 2010-07-07
DE102007047074A1 (de) 2009-04-02
US8828150B2 (en) 2014-09-09
JP2010540777A (ja) 2010-12-24
WO2009047084A3 (fr) 2010-04-29
BRPI0818290A2 (pt) 2015-04-14
CN101809184A (zh) 2010-08-18
WO2009047084A2 (fr) 2009-04-16
CN101809184B (zh) 2012-12-12

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