GB1034270A - Case-hardening processes - Google Patents

Case-hardening processes

Info

Publication number
GB1034270A
GB1034270A GB22540/65A GB2254065A GB1034270A GB 1034270 A GB1034270 A GB 1034270A GB 22540/65 A GB22540/65 A GB 22540/65A GB 2254065 A GB2254065 A GB 2254065A GB 1034270 A GB1034270 A GB 1034270A
Authority
GB
United Kingdom
Prior art keywords
case
bath
molten
urea
salt
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
GB22540/65A
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.)
Motors Liquidation Co
Original Assignee
Motors Liquidation 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 Motors Liquidation Co filed Critical Motors Liquidation Co
Publication of GB1034270A publication Critical patent/GB1034270A/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)
  • Heat Treatment Of Articles (AREA)
  • Lubricants (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

Ferrous alloy articles, such as mild steel gears or crankshafts, are case-hardened by immersing the article, for a time and at a temperature sufficient to form a nitride case on the article e.g. for 1-5 hours at 850-1, 100 DEG F., in a fused salt bath containing at least one cyanate produced in sity by adding urea, e.g. in the form of a prepared salt containing urea or in molten form, to one or more of the salts, preferably as a molten bath, alkali or alkaline earth metal cyanides and/or carbonates. During the addition of urea, the molten salt bath may be agitated by bubbling dry air through it. The fused salt bath may also contain one or more alkali or alkaline earth metal chlorides. The concentration of cyanate salt is preferably between 10 and 60% by weight of the bath. After water or oil quenching or air cooling, the resulting case may consist of iron nitride with some iron carbide.
GB22540/65A 1964-06-15 1965-05-27 Case-hardening processes Expired GB1034270A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US375373A US3303063A (en) 1964-06-15 1964-06-15 Liquid nitriding process using urea

Publications (1)

Publication Number Publication Date
GB1034270A true GB1034270A (en) 1966-06-29

Family

ID=23480637

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22540/65A Expired GB1034270A (en) 1964-06-15 1965-05-27 Case-hardening processes

Country Status (2)

Country Link
US (1) US3303063A (en)
GB (1) GB1034270A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2206131A (en) * 1985-02-25 1988-12-29 Lucas Ind Plc Interstitial-free steel component
GB2173513B (en) * 1985-02-25 1989-06-14 Lucas Ind Plc Making of steel component
GB2280204A (en) * 1993-07-23 1995-01-25 Degussa Method for the preparation of a hardening salt in lump form
CN111979512A (en) * 2020-08-04 2020-11-24 蚌埠艾普压缩机制造有限公司 Salt bath composition for salt bath nitriding treatment of compressor blade and treatment method

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2208004A1 (en) * 1972-11-29 1974-06-21 Ctre Stephanois Rech Surface treating ferrous metals - with molten salt bath contg carbonate, cyanate, lithium, potassium, and sodium ions
BE795015A (en) * 1972-02-18 1973-05-29 Stephanois Rech Mec PROCESS FOR TREATING FERROUS METAL PARTS TO INCREASE THEIR RESISTANCE TO WEAR AND SEIZURE
US4019928A (en) * 1973-03-05 1977-04-26 Duetsche Gold- Und Silber-Scheideanstalt Vormals Roessler Process for nitriding iron and steel in salt baths regenerated with triazine polymers
ES437450A1 (en) * 1974-05-17 1976-12-01 Stephanois Rech Mec Method of maintaining at very low values the content of cyanide in salt baths containing cyanates
US4119444A (en) * 1976-06-07 1978-10-10 Ford Motor Company Pack nitriding process for low alloy steel
US4268323A (en) * 1979-04-05 1981-05-19 Kolene Corp. Process for case hardening steel
DD156877A3 (en) * 1980-06-10 1982-09-29 Ulrich Baumgart REGENERATIVE FOR NITRIERSALZBAEDER
EP0059803B1 (en) * 1981-03-05 1986-02-05 Kolene Corporation A process for case hardening steel
DE3300488A1 (en) * 1983-01-08 1984-07-12 Degussa Ag, 6000 Frankfurt REGENERATION AGENT FOR CARBON SALT BATHS AND METHOD FOR THE PRODUCTION THEREOF
TW557330B (en) * 2000-11-29 2003-10-11 Parker Netsushori Kogyo Kk Improved salt bath nitrogenating method for corrosion-resistant iron material and iron units
US6746546B2 (en) * 2001-11-02 2004-06-08 Kolene Corporation Low temperature nitriding salt and method of use
AU2012362827B2 (en) 2011-12-30 2016-12-22 Scoperta, Inc. Coating compositions
CA2887726A1 (en) 2012-10-11 2014-04-17 Scoperta, Inc. Non-magnetic metal alloy compositions and applications
CA2931842A1 (en) 2013-11-26 2015-06-04 Scoperta, Inc. Corrosion resistant hardfacing alloy
US11130205B2 (en) 2014-06-09 2021-09-28 Oerlikon Metco (Us) Inc. Crack resistant hardfacing alloys
WO2016014851A1 (en) 2014-07-24 2016-01-28 Scoperta, Inc. Hardfacing alloys resistant to hot tearing and cracking
CA2956382A1 (en) 2014-07-24 2016-01-28 Scoperta, Inc. Impact resistant hardfacing and alloys and methods for making the same
CN107532265B (en) 2014-12-16 2020-04-21 思高博塔公司 Ductile and wear resistant iron alloy containing multiple hard phases
MX2018002635A (en) 2015-09-04 2019-02-07 Scoperta Inc Chromium free and low-chromium wear resistant alloys.
WO2017044475A1 (en) 2015-09-08 2017-03-16 Scoperta, Inc. Non-magnetic, strong carbide forming alloys for power manufacture
US10954588B2 (en) 2015-11-10 2021-03-23 Oerlikon Metco (Us) Inc. Oxidation controlled twin wire arc spray materials
CN109312438B (en) 2016-03-22 2021-10-26 思高博塔公司 Fully readable thermal spray coating
WO2020086971A1 (en) 2018-10-26 2020-04-30 Oerlikon Metco (Us) Inc. Corrosion and wear resistant nickel based alloys

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB339220A (en) * 1929-04-10 1930-12-04 Degussa Improvements in or relating to the preparation of cyanates
BE386308A (en) * 1931-02-09
US2049806A (en) * 1933-03-10 1936-08-04 Du Pont Carburization of ferrous metals
US2801154A (en) * 1953-12-31 1957-07-30 Ethyl Corp Preparation of metal cyanates
US2875095A (en) * 1956-10-06 1959-02-24 Gold Und Silber Scheldeanstalt Method of producing surface layers resistant to wear
US3022204A (en) * 1961-03-20 1962-02-20 Kolene Corp Process for nitriding metals
US3208885A (en) * 1962-07-12 1965-09-28 Kolene Corp Apparatus for nitriding of metals

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2206131A (en) * 1985-02-25 1988-12-29 Lucas Ind Plc Interstitial-free steel component
GB2206131B (en) * 1985-02-25 1989-05-24 Lucas Ind Plc Steel component
GB2173513B (en) * 1985-02-25 1989-06-14 Lucas Ind Plc Making of steel component
GB2280204A (en) * 1993-07-23 1995-01-25 Degussa Method for the preparation of a hardening salt in lump form
GB2280204B (en) * 1993-07-23 1996-09-04 Degussa Method for the preparation of a hardening salt in lump form
CN111979512A (en) * 2020-08-04 2020-11-24 蚌埠艾普压缩机制造有限公司 Salt bath composition for salt bath nitriding treatment of compressor blade and treatment method

Also Published As

Publication number Publication date
US3303063A (en) 1967-02-07

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