EP0043742B1 - Procédé de chromisation des aciers par voie gazeuse - Google Patents

Procédé de chromisation des aciers par voie gazeuse Download PDF

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Publication number
EP0043742B1
EP0043742B1 EP81400804A EP81400804A EP0043742B1 EP 0043742 B1 EP0043742 B1 EP 0043742B1 EP 81400804 A EP81400804 A EP 81400804A EP 81400804 A EP81400804 A EP 81400804A EP 0043742 B1 EP0043742 B1 EP 0043742B1
Authority
EP
European Patent Office
Prior art keywords
steels
case
hardening agent
carbon content
gas
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
Application number
EP81400804A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0043742A1 (fr
Inventor
Robert Leveque
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.)
Creusot Loire SA
Original Assignee
Creusot Loire SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Creusot Loire SA filed Critical Creusot Loire SA
Priority to AT81400804T priority Critical patent/ATE6675T1/de
Publication of EP0043742A1 publication Critical patent/EP0043742A1/fr
Application granted granted Critical
Publication of EP0043742B1 publication Critical patent/EP0043742B1/fr
Expired 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
    • C23C12/00—Solid state diffusion of at least one non-metal element other than silicon and at least one metal element or silicon into metallic material surfaces

Definitions

  • the present invention relates to an improvement in chromium plating by gas of steels with more than 0.2% carbon, more especially structural steels and tool steels.
  • the coatings consist essentially of chromium carbonitride Cr 2 (C, N), of which the very high chromium content (Cr between 75 and 85%) , the high level of hardness, between 2000 and 2500 Vickers (under 50 grams) and the hexagonal structure with the base plane of the mesh directed parallel to the surface of the substrate, make it a particularly interesting compound for all problems where l 'We are looking for good resistance to corrosion, friction and wear.
  • the aim of the present invention is to produce single-phase layers of Cr 2 (C, N) by reducing the surface supply of chromium.
  • the subject of the invention is an improvement to the gas chromium-plating process for steels with more than 0.2% carbon, consisting of the three successive treatments according to document EP-A-0 010 484, namely: ionic nitriding of a surface layer of thickness between 100 and 350 micrometers, carried out in an atmosphere constituted by a mixture of nitrogen and hydrogen, at a temperature between 450 ° C and 650 ° C, for a period between 5 and 40 hours, so as to obtain between 1.5% and 2.5% of nitrogen in the nitrided layer; gas chromization, lasting between 5 and 30 hours, and carried out at temperatures between 850 ° and 1100 ° C; a heat treatment comprising an oil quenching of the chromized part followed by tempering at a temperature between 600 ° and 650 ° C, for a duration between 30 minutes and 10 hours; this improvement relating to a gas chromization treatment using a powdered cement based on halide and ferro-chromium at
  • the halide of the cement consists of a powder of chloride of ammonium, at a concentration between 0.5% and 1.5% in said cement.
  • the halide of the cement consists of a powder of magnesium chloride or fluoride d 'ammonium, at a concentration between 0.5% and 1.5% in said cement.
  • the main improvement introduced by the present invention with respect to the prior patent consists in using only ferro-chromium whose carbon content is between 1% and 3%, and is preferably close to 2% .
  • This presence of ferro-chromium carbon makes it possible to obtain, in gas chromization, a perfectly single-phase layer of chromium carbonitrides Cr 2 (C, N), and to avoid the formation of carbides M zs C e (M denoting a metal such as iron (Fe), chromium (Cr), nickel (Ni), etc.).
  • a secondary improvement according to the present invention compared to the previous patent consists, for steels with a carbon content of between 0.20% and 0.35%, while preserving ammonium chloride as halide, to use it at a slightly increased concentration, between 0.5% and 1.5%, instead of 0.4% to 1%.
  • Another improvement according to the present invention with respect to the prior patent consists, for steels with a carbon content greater than 0.35%, of replacing the ammonium chloride either with magnesium chloride or with ammonium fluoride, which are more stable halides than ammonium chloride.
  • the first example relates to a chromium-molybdenum-vanadium steel, of the 32 CDV 13 type, therefore with 0.32% carbon.
  • This steel underwent the first sequence of ionic nitriding under the conditions defined above and more precisely between 520 and 530 ° C, for 30 hours, under a partial nitrogen pressure of between 10 and 50 Pascals, the working pressure being between 250 and 800 Pascals. Under these conditions, the average nitrogen content of the steel between 50 and 200 micrometers deep reaches 2.1% and the nitrided layer does not contain iron nitrides or chromium nitrides.
  • the second example relates to a chromium-molybdenum-vanadium steel of type 40 CDV 12, therefore with 0.40% carbon.
  • This steel underwent the first sequence of ionic nitriding under the conditions which were specified during the description of the first example.
  • the 40 CDV 12 steel sample thus nitrided is introduced into a case hardening box where the second phase of the treatment will take place, which is a gas chromization.
  • the cementing agent consists of 99% ferrochrome with 65/70% chromium and 2% carbon with an average particle size of around 2.7 mm (range: 0.5 and 4 mm), and 1% of magnesium chloride, which, when the temperature rises, will decompose to give the active vapor of chromium chloride CrC1 2 .
  • the enclosure is brought to an average temperature of 950 ° C for a period of 15 hours and the subsequent heat treatment of the steel part is carried out immediately after the chromization phase.

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)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
EP81400804A 1980-05-29 1981-05-21 Procédé de chromisation des aciers par voie gazeuse Expired EP0043742B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81400804T ATE6675T1 (de) 1980-05-29 1981-05-21 Verfahren zum inchromieren von staehlen ueber die gasphase.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8011950 1980-05-29
FR8011950A FR2483468A2 (fr) 1980-05-29 1980-05-29 Perfectionnement dans la chromisation des aciers par voie gazeuse

Publications (2)

Publication Number Publication Date
EP0043742A1 EP0043742A1 (fr) 1982-01-13
EP0043742B1 true EP0043742B1 (fr) 1984-03-14

Family

ID=9242474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400804A Expired EP0043742B1 (fr) 1980-05-29 1981-05-21 Procédé de chromisation des aciers par voie gazeuse

Country Status (7)

Country Link
US (1) US4357182A (xx)
EP (1) EP0043742B1 (xx)
JP (1) JPS5719373A (xx)
AT (1) ATE6675T1 (xx)
DE (1) DE3162611D1 (xx)
FR (1) FR2483468A2 (xx)
ZA (1) ZA812835B (xx)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0264448B1 (en) * 1985-06-17 1990-02-07 Kabushiki Kaisha Toyota Chuo Kenkyusho Method of treating the surface of iron alloy materials
JPS61291962A (ja) * 1985-06-17 1986-12-22 Toyota Central Res & Dev Lab Inc 鉄合金材料の表面処理方法
GB2204327B (en) * 1987-05-01 1991-07-31 Nii Tekh Avtomobil Promy Deposition of diffusion carbide coatings on iron-carbon alloy articles
JPH0248397A (ja) * 1988-08-09 1990-02-19 Kayaba Ind Co Ltd 自動平衡型の昇降装置
US6162513A (en) * 1996-04-19 2000-12-19 Korea Institute Of Science And Technology Method for modifying metal surface
US6083567A (en) 1996-08-30 2000-07-04 University Of Maryland, Baltimore County Sequential ion implantation and deposition (SIID) technique
JP4488840B2 (ja) * 2004-08-30 2010-06-23 本田技研工業株式会社 硬質窒化物層の形成方法、並びにこの形成方法により得られたローラーチェーン及びサイレントチェーン
DE102011119087B3 (de) 2011-11-22 2013-03-14 Märkisches Werk GmbH Verfahren zum Erzeugen einer Chrom-Schutzschicht und ihre Verwendung

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1001856A (fr) * 1949-12-08 1952-02-28 Diffusion Alloys Ltd Procédé de fabrication d'outils de haute qualité
US3190772A (en) * 1960-02-10 1965-06-22 Berghaus Bernhard Method of hardening work in an electric glow discharge
US3249456A (en) * 1962-11-09 1966-05-03 Union Carbide Corp Diffusion coating process
US3282746A (en) * 1963-11-18 1966-11-01 Formsprag Co Method of hardening wear surfaces and product
CH519588A (de) * 1970-02-13 1972-02-29 Berghaus Elektrophysik Anst Verfahren zur Bearbeitung eines Werkstückes mittels einer Glimmentladung und Apparatur zur Durchführung des Verfahrens
JPS5120017B2 (xx) * 1971-11-16 1976-06-22
JPS552721A (en) * 1978-06-19 1980-01-10 Toyota Central Res & Dev Lab Inc Surface-treating method for iron alloy material
FR2439824A1 (fr) * 1978-10-25 1980-05-23 Creusot Loire Perfectionnement dans la chromisation des aciers par voie gazeuse

Also Published As

Publication number Publication date
ATE6675T1 (de) 1984-03-15
EP0043742A1 (fr) 1982-01-13
JPS5719373A (en) 1982-02-01
DE3162611D1 (de) 1984-04-19
FR2483468B2 (xx) 1982-07-16
FR2483468A2 (fr) 1981-12-04
ZA812835B (en) 1982-04-28
US4357182A (en) 1982-11-02
JPS6145700B2 (xx) 1986-10-09

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