GB621553A - Case hardening ferrous articles - Google Patents

Case hardening ferrous articles

Info

Publication number
GB621553A
GB621553A GB682748A GB682748A GB621553A GB 621553 A GB621553 A GB 621553A GB 682748 A GB682748 A GB 682748A GB 682748 A GB682748 A GB 682748A GB 621553 A GB621553 A GB 621553A
Authority
GB
United Kingdom
Prior art keywords
gas
case hardening
articles
ferrous articles
hardening ferrous
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
GB682748A
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.)
Wild Barfield Electric Furnaces Ltd
Original Assignee
Wild Barfield Electric Furnaces 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 Wild Barfield Electric Furnaces Ltd filed Critical Wild Barfield Electric Furnaces Ltd
Priority to GB682748A priority Critical patent/GB621553A/en
Publication of GB621553A publication Critical patent/GB621553A/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
    • C23C8/28—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 more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-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

In a method of case hardening ferrous articles to give a directly useful case, the articles are heated between 850 and 950 DEG C. in an atmosphere consisting of a carburizing and a nitriding gas, the nitriding gas being 2 1/2 to 5 per cent of the total volume. The carburizing gas may be raw or prepared towns gas and the nitriding gas cracked ammonia. Specification 588,547, [Group III], is referred to.
GB682748A 1947-03-26 1947-03-26 Case hardening ferrous articles Expired GB621553A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB682748A GB621553A (en) 1947-03-26 1947-03-26 Case hardening ferrous articles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB682748A GB621553A (en) 1947-03-26 1947-03-26 Case hardening ferrous articles

Publications (1)

Publication Number Publication Date
GB621553A true GB621553A (en) 1949-04-11

Family

ID=9821477

Family Applications (1)

Application Number Title Priority Date Filing Date
GB682748A Expired GB621553A (en) 1947-03-26 1947-03-26 Case hardening ferrous articles

Country Status (1)

Country Link
GB (1) GB621553A (en)

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