GB1185640A - Process for Casehardening Steels - Google Patents

Process for Casehardening Steels

Info

Publication number
GB1185640A
GB1185640A GB1965867A GB1965867A GB1185640A GB 1185640 A GB1185640 A GB 1185640A GB 1965867 A GB1965867 A GB 1965867A GB 1965867 A GB1965867 A GB 1965867A GB 1185640 A GB1185640 A GB 1185640A
Authority
GB
United Kingdom
Prior art keywords
steel
case
salt bath
alkali metal
medium
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
GB1965867A
Inventor
Robert Leslie Hewson
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
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB09659/67A priority Critical patent/GB1191122A/en
Priority to SE1750967A priority patent/SE329751B/xx
Priority to DE19671583371 priority patent/DE1583371A1/en
Priority to BE708388D priority patent/BE708388A/xx
Priority to FR1548117D priority patent/FR1548117A/fr
Priority to NL6717459A priority patent/NL6717459A/xx
Priority to CH1796367A priority patent/CH504539A/en
Priority to US722573A priority patent/US3615908A/en
Priority to DE19681758208 priority patent/DE1758208A1/en
Priority to FR149648A priority patent/FR94664E/en
Priority to BE714333D priority patent/BE714333A/xx
Priority to NL6805948A priority patent/NL6805948A/xx
Priority to ES353267A priority patent/ES353267A2/en
Publication of GB1185640A publication Critical patent/GB1185640A/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

Abstract

1,185,640. Case-hardening of steel. IMPERIAL CHEMICAL INDUSTRIES Ltd. Dec.11, 1967 [Dec.21, 1966; Jan.13, 1967; April 28, 1967 (2)], Nos.57121/66; 1987/67; 19657/67 and 19658/67. Heading C7U. Carbon or alloy case-hardening steel or medium carbon steel is carburized to a depth of at least 0À005" in a solid liquid or gaseous medium at a temperature in the range 800‹ - 950‹C. and is then soaked at 700‹ - 770‹C. for at least 3 minutes in a salt bath containing at least 5% by weight of alkali metal cyanate, calculated as sodium cyanate, and possibly also alkali metal cyanide and carbonate with or without alkali metal chloride. The steel may be transferred directly from the carburizing medium to the salt bath or may be intermediately quenched or allowed to cool and then reheated to 750‹ - 850‹C. to austenitize the case prior to the carbo-nitriding treatment. Reheating may be carried out in a muffle furnace or preferably in a salt bath containing sodium cyanide to avoid decarburization; alternatively in some circumstances the steel may be reheated by immersing it in the molten salt bath and is then held there for at least 10 minutes. The final step of any of these processes is quenching to provide the steel with a martensitic case having an overlying nitrogen-rich case which is resistant to scuffing. For the initial carburizing step an atmosphere containing hydrocarbon gas and ammonia may be used.
GB1965867A 1966-12-21 1966-12-21 Process for Casehardening Steels Expired GB1185640A (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
GB09659/67A GB1191122A (en) 1966-12-21 1967-04-28 Heat-Treatment of Iron and Steel
SE1750967A SE329751B (en) 1966-12-21 1967-12-20
DE19671583371 DE1583371A1 (en) 1966-12-21 1967-12-21 Process for the hardening of steel
BE708388D BE708388A (en) 1966-12-21 1967-12-21
FR1548117D FR1548117A (en) 1966-12-21 1967-12-21
NL6717459A NL6717459A (en) 1966-12-21 1967-12-21
CH1796367A CH504539A (en) 1966-12-21 1967-12-21 Process for heat treatment of steels
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.
BE714333D BE714333A (en) 1966-12-21 1968-04-26
NL6805948A NL6805948A (en) 1966-12-21 1968-04-26
ES353267A ES353267A2 (en) 1966-12-21 1968-04-27 Heattreatment of steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5712166 1966-12-21

Publications (1)

Publication Number Publication Date
GB1185640A true GB1185640A (en) 1970-03-25

Family

ID=10478419

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1965867A Expired GB1185640A (en) 1966-12-21 1966-12-21 Process for Casehardening Steels

Country Status (1)

Country Link
GB (1) GB1185640A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5102476A (en) * 1989-10-04 1992-04-07 Degussa Aktiengesellschaft Process for nitrocarburizing components made from steel
GB2328953A (en) * 1997-09-08 1999-03-10 Rhp Bearings Ltd A process for hardening high alloy steels
WO2012146839A1 (en) 2011-03-11 2012-11-01 H.E.F. Molten-salt bath for nitriding mechanical steel parts, and implementation method
US10053763B2 (en) 2011-06-02 2018-08-21 Aktiebolaget Skf Carbo-nitriding process for martensitic stainless steel and stainless steel article having improved corrosion resistance
CN112469842A (en) * 2018-08-31 2021-03-09 日本帕卡濑精株式会社 Method for producing surface hardening material
US11821465B2 (en) 2021-02-25 2023-11-21 Aktiebolaget Skf Heat-treated roller bearing ring

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5102476A (en) * 1989-10-04 1992-04-07 Degussa Aktiengesellschaft Process for nitrocarburizing components made from steel
GB2328953A (en) * 1997-09-08 1999-03-10 Rhp Bearings Ltd A process for hardening high alloy steels
GB2328953B (en) * 1997-09-08 2002-07-03 Nsk Rhp Europe Technology Co Ltd Improved steel hardening process
WO2012146839A1 (en) 2011-03-11 2012-11-01 H.E.F. Molten-salt bath for nitriding mechanical steel parts, and implementation method
US9611534B2 (en) 2011-03-11 2017-04-04 H.E.F. Molten-salt bath for nitriding mechanical parts made of steel, and implementation method
US10053763B2 (en) 2011-06-02 2018-08-21 Aktiebolaget Skf Carbo-nitriding process for martensitic stainless steel and stainless steel article having improved corrosion resistance
US11667999B2 (en) 2011-06-02 2023-06-06 Ues Inc. Carbo-nitriding process for martensitic stainless steel and stainless steel article having improved corrosion resistance
CN112469842A (en) * 2018-08-31 2021-03-09 日本帕卡濑精株式会社 Method for producing surface hardening material
EP3825438A4 (en) * 2018-08-31 2022-03-16 Nihon Parkerizing Co., Ltd. Method for producing surface-hardened material
US11332818B2 (en) 2018-08-31 2022-05-17 Nihon Parkerizing Co., Ltd. Method for producing surface-hardened material
US11821465B2 (en) 2021-02-25 2023-11-21 Aktiebolaget Skf Heat-treated roller bearing ring

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Legal Events

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