GB1510158A - Nitriding of steel - Google Patents

Nitriding of steel

Info

Publication number
GB1510158A
GB1510158A GB4259475A GB4259475A GB1510158A GB 1510158 A GB1510158 A GB 1510158A GB 4259475 A GB4259475 A GB 4259475A GB 4259475 A GB4259475 A GB 4259475A GB 1510158 A GB1510158 A GB 1510158A
Authority
GB
United Kingdom
Prior art keywords
nitriding
steel
gas
phase
controlled rate
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
GB4259475A
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.)
Bentley Motors Ltd
Original Assignee
Rolls Royce Motors Ltd
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 Rolls Royce Motors Ltd filed Critical Rolls Royce Motors Ltd
Priority to GB4259475A priority Critical patent/GB1510158A/en
Publication of GB1510158A publication Critical patent/GB1510158A/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
    • C23C8/06—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

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

1510158 Gas-nitriding steel ROLLS-ROYCE MOTORS Ltd 9 July 1976 [17 Oct 1975] 42594/75 Heading C7U Steel is nitrided by heating to 490-560‹C in a mixture of nitrogen and ammonia, the nitriding potential of which is maintained over a major part of the cycle by holding the ammonia content of the gas stream leaving the furnace at a fixed value within the range 20 to 40%. Preferably the cycle includes a heating phase during which the temperature is raised at a controlled rate to the nitriding level, a nitriding phase, and a controlled rate cooling phase. The ammonia content of the effluent gas may be initially increased to 90% to purge air, and then reduced to the operating level before the nitriding temperature is reached.
GB4259475A 1976-07-09 1976-07-09 Nitriding of steel Expired GB1510158A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4259475A GB1510158A (en) 1976-07-09 1976-07-09 Nitriding of steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4259475A GB1510158A (en) 1976-07-09 1976-07-09 Nitriding of steel

Publications (1)

Publication Number Publication Date
GB1510158A true GB1510158A (en) 1978-05-10

Family

ID=10425128

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4259475A Expired GB1510158A (en) 1976-07-09 1976-07-09 Nitriding of steel

Country Status (1)

Country Link
GB (1) GB1510158A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3017531A1 (en) * 1980-05-08 1981-11-12 Kali-Chemie Ag, 3000 Hannover METHOD FOR IMPROVING THE THERMAL STABILITY OF FLUORINE CHLORINE HYDROCARBONS
EP0485686A1 (en) * 1990-11-15 1992-05-20 Degussa Aktiengesellschaft Method of nitriding steel articles under pressure
US9506389B2 (en) 2015-03-05 2016-11-29 Caterpillar Inc. System and method for nitriding components of aftertreatment system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3017531A1 (en) * 1980-05-08 1981-11-12 Kali-Chemie Ag, 3000 Hannover METHOD FOR IMPROVING THE THERMAL STABILITY OF FLUORINE CHLORINE HYDROCARBONS
EP0485686A1 (en) * 1990-11-15 1992-05-20 Degussa Aktiengesellschaft Method of nitriding steel articles under pressure
US9506389B2 (en) 2015-03-05 2016-11-29 Caterpillar Inc. System and method for nitriding components of aftertreatment system

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee