EP0421236B1 - Procédé pour la nitrocarburisation de pièces en acier - Google Patents

Procédé pour la nitrocarburisation de pièces en acier Download PDF

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Publication number
EP0421236B1
EP0421236B1 EP90118366A EP90118366A EP0421236B1 EP 0421236 B1 EP0421236 B1 EP 0421236B1 EP 90118366 A EP90118366 A EP 90118366A EP 90118366 A EP90118366 A EP 90118366A EP 0421236 B1 EP0421236 B1 EP 0421236B1
Authority
EP
European Patent Office
Prior art keywords
nitrocarburizing
stage
minutes
treatment
carried out
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
Application number
EP90118366A
Other languages
German (de)
English (en)
Other versions
EP0421236A1 (fr
Inventor
Georg Dipl.-Ing. Wahl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Houghton Durferrit degussa-Huels AG GmbH
Original Assignee
Degussa GmbH
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Filing date
Publication date
Application filed by Degussa GmbH filed Critical Degussa GmbH
Priority to AT90118366T priority Critical patent/ATE89333T1/de
Publication of EP0421236A1 publication Critical patent/EP0421236A1/fr
Application granted granted Critical
Publication of EP0421236B1 publication Critical patent/EP0421236B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C23C8/40—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 liquids, e.g. salt baths, liquid suspensions
    • C23C8/52—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 liquids, e.g. salt baths, liquid suspensions more than one element being applied in one step
    • C23C8/54—Carbo-nitriding
    • C23C8/56—Carbo-nitriding of ferrous surfaces

Definitions

  • the invention relates to a method for nitrocarburizing steel components in cyanate- and cyanide-containing molten salts at temperatures of 560 to 700 o C.
  • molten salts from mixtures of alkali cyanides, alkali cyanates and alkali carbonates are used, which are usually operated at temperatures of 560 to 590 o C.
  • Such salt baths are known for example from DE-PS 1 149 035.
  • nitrocarburizing salt baths that work at higher temperatures up to 700 oC .
  • the workpieces are exposed to the action of the molten salt for some time, with nitrogen and carbon diffusing into the workpieces and iron carbonitride phases being formed in the surface layers. These phases particularly increase the wear resistance and corrosion resistance of the components.
  • the nitrogen and carbon supply of the molten salt, the treatment temperature and the treatment time influence the structure, the thickness and the quality of the nitrocarburizing layer.
  • nitrocarburizing treatment is carried out in the salt baths containing cyanate and cyanide, for example at 580 o C, components are obtained which have very good properties with regard to wear and corrosion resistance.
  • the reason for this is the formation of a monophase ⁇ -iron carbonitride layer.
  • 580 o C relatively long periods of time are necessary, which are normally several hours.
  • the nitrocarburizing treatment is carried out in a first stage at 600 to 700 o C and in a second stage at 560 to 590 o C, the Nitrocarburizing times of the two stages can range from 20: 1 to 1:15.
  • the treatment is preferably carried out in the first stage at 610 to 650 ° C. for 10 to 120 minutes and in the second stage at 570 to 590 ° C. for 10 to 90 minutes.
  • connection layer With this two-stage treatment, a sufficiently thick connection layer can be achieved in a relatively short time, which surprisingly has the same properties as a connection layer that is formed in considerably longer periods at temperatures of 560 to 590 ° C. This makes it possible to shorten the nitrocarburizing time considerably without deteriorating the quality of the treated components with regard to wear, corrosion, fatigue strength and others.
  • Figures 1 and 2 show a graphical representation of the corrosion behavior (Fig. 1) and the wear resistance (Fig. 2) of samples made of steel CK 45 after treatment in a molten salt with 2.8% by weight cyanide and 37.4% by weight. % Cyanate at different temperatures.
  • Fig. 1 compares the corrosion resistance of cylindrical samples after nitrocarburizing. In all cases the treatment was carried out so that a connecting layer thickness of about 15 ⁇ m was present.
  • the left bar shows the corrosion resistance of piston rods that were nitrocarburized for 90 minutes at 580 o C.
  • the middle bar shows the resistance of the parts after 30 minutes nitrocarburizing at 630 o C and the right bar shows the resistance of samples, the first 20 minutes at 630 o and then 20 minutes at 580 o C have been nitrocarburized.
  • the wear behavior is also favorably influenced by the two-stage treatment according to the invention.
  • the result of an Amsler test is shown in Figure 2.
  • Curve 1 corresponds to the normal treatment of samples made of material C45, 90 minutes at 580 o C;
  • curve 2 was determined on samples which had been nitrocrubbed for 30 minutes at 630 o C and the result of the two-stage nitrocarburization, 20 minutes 630 o C and 20 minutes 580 o C, shows curve 3.
  • the wear behavior of a component that lasted 20 minutes at 630 o C and then treated for 20 minutes at 580 o is comparable to that of a component that was nitrocarburized for 90 minutes at 580 o C.
  • the treatment time is thus more than halved with the method according to the invention.

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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Heat Treatment Of Steel (AREA)
  • Artificial Fish Reefs (AREA)
  • Catalysts (AREA)
  • Fire-Extinguishing Compositions (AREA)
  • Bulkheads Adapted To Foundation Construction (AREA)
  • Investigating And Analyzing Materials By Characteristic Methods (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)

Claims (2)

  1. Procédé de nitrocarburation de pièces de construction en acier dans des bains de sels en fusion contenant des cyanates et des cyanures à des températures de 560 à 700°C,
       caractérisé
       - en ce que le traitement de nitrocarburation est exécuté dans une première étape entre 600 et 700°C et dans une deuxième étape de 560 à 590°C, les temps de nitrocarburation des deux étapes pouvant se développer dans le rapport de 20:1 à 1:15.
  2. Procédé selon la revendication 1,
       caractérisé
       - en ce que le traitement dans la première étape de 610 à 650°C est exécuté pendant 10 à 120 minutes et dans la deuxième étape de 570 à 590 °C pendant 10 à 90 minutes.
EP90118366A 1989-10-04 1990-09-25 Procédé pour la nitrocarburisation de pièces en acier Expired - Lifetime EP0421236B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90118366T ATE89333T1 (de) 1989-10-04 1990-09-25 Verfahren zum nitrocarburieren von bauteilen aus stahl.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3933053 1989-10-04
DE3933053A DE3933053C1 (fr) 1989-10-04 1989-10-04

Publications (2)

Publication Number Publication Date
EP0421236A1 EP0421236A1 (fr) 1991-04-10
EP0421236B1 true EP0421236B1 (fr) 1993-05-12

Family

ID=6390773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90118366A Expired - Lifetime EP0421236B1 (fr) 1989-10-04 1990-09-25 Procédé pour la nitrocarburisation de pièces en acier

Country Status (15)

Country Link
US (1) US5102476A (fr)
EP (1) EP0421236B1 (fr)
JP (1) JP3001949B2 (fr)
AT (1) ATE89333T1 (fr)
BR (1) BR9004967A (fr)
CA (1) CA2026902C (fr)
CS (1) CS9004790A3 (fr)
DE (2) DE3933053C1 (fr)
DK (1) DK0421236T3 (fr)
ES (1) ES2055263T3 (fr)
PT (1) PT95496B (fr)
RU (1) RU1833436C (fr)
TR (1) TR24861A (fr)
YU (1) YU183690A (fr)
ZA (1) ZA907704B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6093303A (en) * 1998-08-12 2000-07-25 Swagelok Company Low temperature case hardening processes
US6165597A (en) * 1998-08-12 2000-12-26 Swagelok Company Selective case hardening processes at low temperature

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5525165A (en) * 1994-06-06 1996-06-11 National Science Council Method of surface modification of titanium alloy
DE4442328C1 (de) * 1994-11-29 1995-09-21 Durferrit Thermotechnik Gmbh Verfahren zur Vorbehandlung von Stahlteilen vor dem Salzbadnitrieren
FR2731232B1 (fr) * 1995-03-01 1997-05-16 Stephanois Rech Procede de traitement de surfaces ferreuses soumises a des sollicitations elevees de frottement
US6547888B1 (en) 2000-01-28 2003-04-15 Swagelok Company Modified low temperature case hardening processes
US8099364B2 (en) * 2001-05-31 2012-01-17 Contentguard Holdings, Inc. Digital rights management of content when content is a future live event
US6656293B2 (en) 2001-12-10 2003-12-02 Caterpillar Inc Surface treatment for ferrous components
US20030155045A1 (en) * 2002-02-05 2003-08-21 Williams Peter C. Lubricated low temperature carburized stainless steel parts
DE102004022248B4 (de) * 2004-05-04 2007-06-14 Zf Friedrichshafen Ag Verfahren zur Herstellung von Kugeln oder Kugelsegmenten, sowie danach hergestelltes Kugelelement für zweiteilige Kugelzapfen
US7556699B2 (en) * 2004-06-17 2009-07-07 Cooper Clark Vantine Method of plasma nitriding of metals via nitrogen charging
US20060048857A1 (en) * 2004-09-09 2006-03-09 Cooper Clark V Method for processing alloys via high-current density ion implantation
US7695573B2 (en) * 2004-09-09 2010-04-13 Sikorsky Aircraft Corporation Method for processing alloys via plasma (ion) nitriding
WO2006071502A2 (fr) * 2004-12-23 2006-07-06 United Technologies Corporation Composition et processus permettant de renforcer les proprietes de composants ferreux
EP2881492B1 (fr) 2013-12-06 2017-05-03 Hubert Stüken GMBH & CO. KG Procédé de carburation d'un article thermoformé ou d'un article plié-découpé à partir d'acier inoxydable austénitique
EP2881493B1 (fr) 2013-12-06 2016-08-24 Hubert Stüken GMBH & CO. KG Procédé de nitrocarburation d'un article thermoformé ou d'un article plié-découpé à partir d'acier inoxydable austénitique
CN106741205A (zh) * 2016-12-27 2017-05-31 北京新能源汽车股份有限公司 发动机罩锁及发动机罩锁的制造方法
CN109338280B (zh) * 2018-11-21 2021-11-05 中国航发哈尔滨东安发动机有限公司 一种三代渗碳钢渗碳后氮化方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1893077A (en) * 1930-09-26 1933-01-03 Garweg August Hardening medium and process for hardening tools of iron or steel
FR971798A (fr) * 1947-09-19 1951-01-22 United Western Corp Procédé pour la formation de couches de nitrure sur le fer et sur l'acier
GB1185640A (en) * 1966-12-21 1970-03-25 Ici Ltd Process for Casehardening Steels

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6093303A (en) * 1998-08-12 2000-07-25 Swagelok Company Low temperature case hardening processes
US6165597A (en) * 1998-08-12 2000-12-26 Swagelok Company Selective case hardening processes at low temperature

Also Published As

Publication number Publication date
PT95496A (pt) 1991-06-25
DE59001435D1 (de) 1993-06-17
ES2055263T3 (es) 1994-08-16
JP3001949B2 (ja) 2000-01-24
ZA907704B (en) 1992-03-25
CA2026902A1 (fr) 1991-04-05
RU1833436C (ru) 1993-08-07
YU183690A (sh) 1992-12-21
CS275177B2 (en) 1992-02-19
ATE89333T1 (de) 1993-05-15
PT95496B (pt) 1997-09-30
TR24861A (tr) 1992-07-01
DK0421236T3 (da) 1993-10-11
CS9004790A3 (en) 1992-02-19
JPH03177559A (ja) 1991-08-01
DE3933053C1 (fr) 1990-05-03
CA2026902C (fr) 1998-12-01
BR9004967A (pt) 1991-09-10
EP0421236A1 (fr) 1991-04-10
US5102476A (en) 1992-04-07

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