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GB1191122A - Heat-Treatment of Iron and Steel - Google Patents

Heat-Treatment of Iron and Steel

Info

Publication number
GB1191122A
GB1191122A GB09659/67A GB1965967A GB1191122A GB 1191122 A GB1191122 A GB 1191122A GB 09659/67 A GB09659/67 A GB 09659/67A GB 1965967 A GB1965967 A GB 1965967A GB 1191122 A GB1191122 A GB 1191122A
Authority
GB
United Kingdom
Prior art keywords
steel
alkali metal
iron
salt bath
minutes
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
GB09659/67A
Inventor
Frederick David Waterfall
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries 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
Priority claimed from GB1965867A external-priority patent/GB1185640A/en
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB09659/67A priority Critical patent/GB1191122A/en
Priority to US722573A priority patent/US3615908A/en
Priority to DE19681758208 priority patent/DE1758208A1/en
Priority to FR149648A priority patent/FR94664E/en
Priority to NL6805948A priority patent/NL6805948A/xx
Priority to BE714333D priority patent/BE714333A/xx
Priority to ES353267A priority patent/ES353267A2/en
Priority to CH623868A priority patent/CH527915A/en
Publication of GB1191122A publication Critical patent/GB1191122A/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
    • C23C8/02—Pretreatment of the material to be coated
    • 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
    • C23C8/52—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 more than one element being applied in one step
    • C23C8/54—Carbo-nitriding

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

1,191,122. Case-hardening iron or steel. IMPERIAL CHEMICAL INDUSTRIES Ltd. March 27, 1968 [April 29, 1967], No. 19659/67. Headings C7A and C7U. Iron or steel containing at least 0À25% C, e.g. nodular cast iron or plain carbon or alloy steel for engine valve rockers, transmission gears or tools, is hardened by austenitizing it in a non- carburizing heating medium, e.g. a non-oxidizing atmosphere or neutral salt bath, then soaking it in a molten salt bath containing at least 5% alkali metal cyanate (calculated as NaCNO) at 700-770‹ C. for at least 3 minutes, prior to quenching e.g. in water or oil. The molten salt bath is preferably a carbonitriding bath comprising alkali metal cyanate, cyanide, carbonate and optionally chloride. For 0À9%C steels, a conventional carburizing atmosphere or salt bath containing alkali metal cyanide, but which is non-carburizing towards these steels, may be used for austenitizing. Examples are disclosed wherein discs of 0À9%C steel are austenitized in a NaCl + KCl bath at 800‹ C. for 10 minutes, then tranferred to a bath containing 26À1 or 23À0% NaCN and 13À7 or 11À3% NaCNO, balance alkali metal carbonate, at 730 or 750‹C. and holding therein for 10 minutes, prior to water quenching. Specification 1,185,640 is referred to.
GB09659/67A 1966-12-21 1967-04-28 Heat-Treatment of Iron and Steel Expired GB1191122A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
GB09659/67A GB1191122A (en) 1966-12-21 1967-04-28 Heat-Treatment of Iron and Steel
US722573A US3615908A (en) 1966-12-21 1968-04-19 Heattreatment of steel
DE19681758208 DE1758208A1 (en) 1966-12-21 1968-04-23 Process for the heat treatment of steel
FR149648A FR94664E (en) 1966-12-21 1968-04-26 Process of heat treatment of steel.
NL6805948A NL6805948A (en) 1966-12-21 1968-04-26
BE714333D BE714333A (en) 1966-12-21 1968-04-26
ES353267A ES353267A2 (en) 1966-12-21 1968-04-27 PROCEDURE FOR THE CEMENTATION OF STEELS.
CH623868A CH527915A (en) 1967-04-28 1968-04-28 Process for the heat treatment of steel

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB1965867A GB1185640A (en) 1966-12-21 1966-12-21 Process for Casehardening Steels
GB5712166 1966-12-21
GB198767 1967-01-13
GB1965767 1967-04-28
GB09659/67A GB1191122A (en) 1966-12-21 1967-04-28 Heat-Treatment of Iron and Steel

Publications (1)

Publication Number Publication Date
GB1191122A true GB1191122A (en) 1970-05-06

Family

ID=10133049

Family Applications (1)

Application Number Title Priority Date Filing Date
GB09659/67A Expired GB1191122A (en) 1966-12-21 1967-04-28 Heat-Treatment of Iron and Steel

Country Status (7)

Country Link
US (1) US3615908A (en)
BE (1) BE714333A (en)
DE (1) DE1758208A1 (en)
ES (1) ES353267A2 (en)
FR (1) FR94664E (en)
GB (1) GB1191122A (en)
NL (1) NL6805948A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1340917A (en) * 1971-03-31 1973-12-19 Lucas Industries Ltd Nitriding alloy steel parts in a fused salt bath
JPS57171624A (en) * 1981-04-14 1982-10-22 Toyota Central Res & Dev Lab Inc Production of cutlery
FR2863629B1 (en) * 2003-12-12 2006-12-08 Etudes Const Mecaniques METHOD AND DEVICE FOR CHEMICAL CHEMICAL PROCESSING OF MECHANICAL PARTS
CN111763808A (en) * 2020-07-13 2020-10-13 扬州大学 A Novel Quenching-Partitioning-Isothermal Heat Treatment Process for Surface Microstructure Gradient of Nodular Cast Iron Parts and Improving Wear Resistance
CN114962460A (en) 2021-02-25 2022-08-30 斯凯孚公司 Heat treated roller bearing ring

Also Published As

Publication number Publication date
BE714333A (en) 1968-10-28
NL6805948A (en) 1968-10-29
DE1758208A1 (en) 1971-01-28
US3615908A (en) 1971-10-26
FR94664E (en) 1969-10-03
ES353267A2 (en) 1969-10-01

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee