GB2018299A - Heat treatment of metal - Google Patents
Heat treatment of metalInfo
- 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- Withdrawn
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
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.
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)
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 |
-
1979
- 1979-04-17 GB GB7913352A patent/GB2018299A/en not_active Withdrawn
Cited By (17)
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) |