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GB711848A - Improved method for surface hardening by carbo-nitriding at low temperatures - Google Patents

Improved method for surface hardening by carbo-nitriding at low temperatures

Info

Publication number
GB711848A
GB711848A GB3036/51A GB303651A GB711848A GB 711848 A GB711848 A GB 711848A GB 3036/51 A GB3036/51 A GB 3036/51A GB 303651 A GB303651 A GB 303651A GB 711848 A GB711848 A GB 711848A
Authority
GB
United Kingdom
Prior art keywords
carbo
nitriding
temperature
low temperatures
improved method
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
GB3036/51A
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.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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 Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of GB711848A publication Critical patent/GB711848A/en
Expired legal-status Critical Current

Links

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
    • C23C8/80—After-treatment

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)

Abstract

A method of carbo-nitriding ferrous metal comprises the following steps:- (a) carbo-nitriding at a temperature between the Ae1 and Ae3 temperatures of the metal; (b) cooling to a temperature between the Ae1 temperature of the core and the Ae3 temperature of the carbo-nitrided layer; (c) maintaining at this temperature until the austenite of the core is converted to ferrite and cementite; (d) quenching to transform the carbo-nitrided layer to martensite. The carbo-nitriding may be carried out in an atmosphere consisting mainly of carbon monoxide and hydrogen with the addition of a hydrocarbon gas and ammonia or with the addition of acetonitrile only. Specifications 696,688 and 711,845 are referred to.
GB3036/51A 1950-05-02 1951-02-07 Improved method for surface hardening by carbo-nitriding at low temperatures Expired GB711848A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR711848X 1950-05-02

Publications (1)

Publication Number Publication Date
GB711848A true GB711848A (en) 1954-07-14

Family

ID=9077425

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3036/51A Expired GB711848A (en) 1950-05-02 1951-02-07 Improved method for surface hardening by carbo-nitriding at low temperatures

Country Status (1)

Country Link
GB (1) GB711848A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136664A (en) * 1959-12-15 1964-06-09 Sedis Transmissions Mec Steel transmission chain
DE3235807A1 (en) * 1981-10-01 1983-04-21 Kabushiki Kaisha Komatsu Seisakusho, Tokyo SURFACE TREATMENT OF STEEL THROUGH HEAT TREATMENT

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136664A (en) * 1959-12-15 1964-06-09 Sedis Transmissions Mec Steel transmission chain
DE3235807A1 (en) * 1981-10-01 1983-04-21 Kabushiki Kaisha Komatsu Seisakusho, Tokyo SURFACE TREATMENT OF STEEL THROUGH HEAT TREATMENT

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