GB414092A - Improvements in or relating to the case hardening of iron, steel and alloy steels - Google Patents

Improvements in or relating to the case hardening of iron, steel and alloy steels

Info

Publication number
GB414092A
GB414092A GB2714/33A GB271433A GB414092A GB 414092 A GB414092 A GB 414092A GB 2714/33 A GB2714/33 A GB 2714/33A GB 271433 A GB271433 A GB 271433A GB 414092 A GB414092 A GB 414092A
Authority
GB
United Kingdom
Prior art keywords
per cent
steel
iron
case hardening
alloy steels
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
GB2714/33A
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.)
Roessler and Hasslacher Chemical Co
Original Assignee
Roessler and Hasslacher Chemical Co
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 Roessler and Hasslacher Chemical Co filed Critical Roessler and Hasslacher Chemical Co
Publication of GB414092A publication Critical patent/GB414092A/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
    • C23C8/40—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 liquids, e.g. salt baths, liquid suspensions
    • C23C8/42—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 liquids, e.g. salt baths, liquid suspensions only one element being applied
    • C23C8/48—Nitriding
    • C23C8/50—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)
  • Chemical Treatment Of Metals (AREA)

Abstract

In a process for case hardening articles of iron, steel or alloy steels, the articles are immersed in a fused alkali salt bath containing up to 20 per cent by weight of a boron compound at least 5 per cent by weight of an alkali metal cyanide and no alkaline earth compounds or complex cyanides, the temperature of the bath being 550-860 DEG C. and preferably 790-845 DEG C. In an example, a bath contains 15 per cent of sodium cyanide, 65 of sodium chloride, 20 of potassium chloride and 1 of boron oxide. An alloy steel containing 0,8-1,1 per cent of chromium, 0,3-0,4 of carbon and 0,3-0,4 of manganese is referred to.
GB2714/33A 1932-01-27 1933-01-27 Improvements in or relating to the case hardening of iron, steel and alloy steels Expired GB414092A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US414092XA 1932-01-27 1932-01-27

Publications (1)

Publication Number Publication Date
GB414092A true GB414092A (en) 1934-07-27

Family

ID=21916367

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2714/33A Expired GB414092A (en) 1932-01-27 1933-01-27 Improvements in or relating to the case hardening of iron, steel and alloy steels

Country Status (1)

Country Link
GB (1) GB414092A (en)

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