GB443524A - Improvements in and relating to the process of case-hardening iron or steel or alloyed steel articles - Google Patents

Improvements in and relating to the process of case-hardening iron or steel or alloyed steel articles

Info

Publication number
GB443524A
GB443524A GB713535A GB713535A GB443524A GB 443524 A GB443524 A GB 443524A GB 713535 A GB713535 A GB 713535A GB 713535 A GB713535 A GB 713535A GB 443524 A GB443524 A GB 443524A
Authority
GB
United Kingdom
Prior art keywords
steel
articles
case
relating
ammonia
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
GB713535A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB713535A priority Critical patent/GB443524A/en
Publication of GB443524A publication Critical patent/GB443524A/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

Abstract

Iron, steel, or alloy steel articles are case-hardened by exposing them to a mixture of ammonia and hydrocarbon gas other than acetylene within a mixing range of between (1) one volume of hydrocarbon gas and five volumes of ammonia and (2) one volume of ammonia and three volumes of hydrocarbon gas, the articles being maintained at a temperature of 1300-1450 DEG F., preferably at 1350 DEG F. The duration of the exposure of the heated articles may be from two to three minutes or twenty to thirty minutes. The treated articles may then be quenched.
GB713535A 1935-03-07 1935-03-07 Improvements in and relating to the process of case-hardening iron or steel or alloyed steel articles Expired GB443524A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB713535A GB443524A (en) 1935-03-07 1935-03-07 Improvements in and relating to the process of case-hardening iron or steel or alloyed steel articles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB713535A GB443524A (en) 1935-03-07 1935-03-07 Improvements in and relating to the process of case-hardening iron or steel or alloyed steel articles

Publications (1)

Publication Number Publication Date
GB443524A true GB443524A (en) 1936-03-02

Family

ID=9827275

Family Applications (1)

Application Number Title Priority Date Filing Date
GB713535A Expired GB443524A (en) 1935-03-07 1935-03-07 Improvements in and relating to the process of case-hardening iron or steel or alloyed steel articles

Country Status (1)

Country Link
GB (1) GB443524A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2472320A (en) * 1941-02-05 1949-06-07 Ford Motor Co Method of heat-treating steel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2472320A (en) * 1941-02-05 1949-06-07 Ford Motor Co Method of heat-treating steel

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