GB2018299A - Heat treatment of metal - Google Patents

Heat treatment of metal

Info

Publication number
GB2018299A
GB2018299A GB7913352A GB7913352A GB2018299A GB 2018299 A GB2018299 A GB 2018299A GB 7913352 A GB7913352 A GB 7913352A GB 7913352 A GB7913352 A GB 7913352A GB 2018299 A GB2018299 A GB 2018299A
Authority
GB
United Kingdom
Prior art keywords
heat treatment
mixture
gas
supply
conditioning
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.)
Withdrawn
Application number
GB7913352A
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.)
BOC Ltd
Original Assignee
BOC 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 BOC Ltd filed Critical BOC Ltd
Priority to GB7913352A priority Critical patent/GB2018299A/en
Publication of GB2018299A publication Critical patent/GB2018299A/en
Withdrawn legal-status Critical Current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
    • C23C8/08—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 only one element being applied
    • C23C8/24—Nitriding
    • C23C8/26—Nitriding of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere
    • 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
    • C23C8/08—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 only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

A heat treatment is performed by admitting to the working chamber of the furnace a gas mixture comprising inert gas, an oxygen- bearing medium and a hydrocarbon (typically 81% N2; 4% air and 15% natural gas). The hydrocarbon and oxygen-bearing medium react together. To ensure that the reaction is self sustaining, a conditioning gas mixture comprising inert gas and reducing gas is admitted to the chamber before the heat treatment mixture. Supply of the conditioning mixture (typically 89% N2; 7% natural gas, and 4% NH3) is continued until the oxygen potential (as indicated by a suitable meter) is reduced to a chosen value. The supply of the conditioning mixture is then stopped, and the supply of the heat treatment mixture started. The heat treatment may be carburisation, decarburisation, carbonitriding, hardening or annealing.
GB7913352A 1978-01-17 1979-04-17 Heat treatment of metal Withdrawn GB2018299A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7913352A GB2018299A (en) 1978-01-17 1979-04-17 Heat treatment of metal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB185678 1978-01-17
GB7913352A GB2018299A (en) 1978-01-17 1979-04-17 Heat treatment of metal

Publications (1)

Publication Number Publication Date
GB2018299A true GB2018299A (en) 1979-10-17

Family

ID=26237035

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7913352A Withdrawn GB2018299A (en) 1978-01-17 1979-04-17 Heat treatment of metal

Country Status (1)

Country Link
GB (1) GB2018299A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027649A1 (en) * 1979-10-23 1981-04-29 Air Products And Chemicals, Inc. Protective atmosphere process for annealing and or spheroidizing ferrous metals
EP0120373A1 (en) * 1983-03-24 1984-10-03 Linde Aktiengesellschaft Process for coating surfaces with carbon black
EP0406047A1 (en) * 1989-06-30 1991-01-02 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for heat-treating of metals
GB2233672A (en) * 1989-06-30 1991-01-16 Shell Int Research High temperature treatment of stainless steals used in high temperature reactors
EP0482992A1 (en) * 1990-10-26 1992-04-29 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for the production of a thermic treatment atmosphere
EP0603744A2 (en) * 1992-12-22 1994-06-29 Air Products And Chemicals, Inc. Heat treating atmospheres from non-cryogenically generated nitrogen
WO1999039012A1 (en) * 1998-01-29 1999-08-05 Air Products And Chemicals, Inc. Gas regulation system for blast furnace
US6464928B1 (en) 1998-01-29 2002-10-15 Airproducts And Chemicals Inc Gas regulation system for blast furnace
WO2005098056A1 (en) * 2004-04-07 2005-10-20 L'AIR LIQUIDE Société Anonyme à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation Method for the thermal treatment of metals
EP0796919B2 (en) † 1996-03-20 2006-12-20 SOL S.p.A. Process and plant for thermal treatment of metals in protecting atmosphere

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027649A1 (en) * 1979-10-23 1981-04-29 Air Products And Chemicals, Inc. Protective atmosphere process for annealing and or spheroidizing ferrous metals
EP0120373A1 (en) * 1983-03-24 1984-10-03 Linde Aktiengesellschaft Process for coating surfaces with carbon black
EP0406047A1 (en) * 1989-06-30 1991-01-02 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for heat-treating of metals
FR2649123A1 (en) * 1989-06-30 1991-01-04 Air Liquide METHOD FOR HEAT TREATING METALS
GB2233672A (en) * 1989-06-30 1991-01-16 Shell Int Research High temperature treatment of stainless steals used in high temperature reactors
US5069728A (en) * 1989-06-30 1991-12-03 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for heat treating metals in a continuous oven under controlled atmosphere
US5242509A (en) * 1990-10-26 1993-09-07 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process of the production of an atmosphere for the thermal treatment of metals and thermal treatment apparatus
FR2668584A1 (en) * 1990-10-26 1992-04-30 Air Liquide PROCESS FOR THE PREPARATION OF A HEAT TREATMENT ATMOSPHERE AND HEAT TREATMENT PLANT.
EP0482992A1 (en) * 1990-10-26 1992-04-29 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for the production of a thermic treatment atmosphere
AU643332B2 (en) * 1990-10-26 1993-11-11 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process of the production of an atmosphere for the thermal treatment of metals and thermal treatment apparatus
EP0692545A1 (en) * 1990-10-26 1996-01-17 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Heat-treatment installation
EP0603744A2 (en) * 1992-12-22 1994-06-29 Air Products And Chemicals, Inc. Heat treating atmospheres from non-cryogenically generated nitrogen
EP0603744A3 (en) * 1992-12-22 1994-10-05 Air Prod & Chem Heat treating atmospheres from non-cryogenically generated nitrogen.
EP0796919B2 (en) † 1996-03-20 2006-12-20 SOL S.p.A. Process and plant for thermal treatment of metals in protecting atmosphere
WO1999039012A1 (en) * 1998-01-29 1999-08-05 Air Products And Chemicals, Inc. Gas regulation system for blast furnace
US6464928B1 (en) 1998-01-29 2002-10-15 Airproducts And Chemicals Inc Gas regulation system for blast furnace
WO2005098056A1 (en) * 2004-04-07 2005-10-20 L'AIR LIQUIDE Société Anonyme à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation Method for the thermal treatment of metals

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)