GB683488A - Improved method for the preparation of gas for use in case-hardening steel by means of carbon - Google Patents

Improved method for the preparation of gas for use in case-hardening steel by means of carbon

Info

Publication number
GB683488A
GB683488A GB521450A GB521450A GB683488A GB 683488 A GB683488 A GB 683488A GB 521450 A GB521450 A GB 521450A GB 521450 A GB521450 A GB 521450A GB 683488 A GB683488 A GB 683488A
Authority
GB
United Kingdom
Prior art keywords
gas
heaters
air
reaction tubes
furnace
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
GB521450A
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.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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 Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of GB683488A publication Critical patent/GB683488A/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
    • C23C8/06—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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
    • C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
    • C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
    • C01B3/346—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents using heat generated by superheated steam
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
    • C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
    • C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
    • C01B3/36—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents using oxygen or mixtures containing oxygen as gasifying agents

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Furnace Details (AREA)
  • Tunnel Furnaces (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

683,488. Gaseous mixtures. REGIENATIONALE DES USINES RENAULT. March 1, 1950 [May 5, 1949], No. 5214/50. Classes 55 (i) and 55 (ii) [Also in Group II] In a process for preparing a gaseous atmosphere for the cementation of steel such as described in Specifications 480,103, 481,797, [Group II], 489,177, wherein town gas and air are passed over charcoal heated to about 1050‹C., the gas or air or both are preheated in the furnace or an independent heater or by the sensible heat of the furnace gases. The air may be heated to 600-800‹C. and the gas to 300‹- 400‹C. The plant may comprise two reaction tubes 8, 9 in series and air heaters 4, 14, and gas heaters 13, 15 in duplicate, arranged to operate alternately under the control of valves 16 ... 19 reversing the direction of gas flow through the reaction tubes. As shown the air heaters are traversed by the furnace gases and the gas heaters comprise an electric heater 7 ; or the gas heaters may be located in the furnace flue, after the air heaters. Modifications include separate electric heaters for the reaction tubes and both air and gas heaters, gas heaters traversed by the hot cementation gas, reaction tubes operated in parallel with the gas flow continuously in the same direction and the air heaters being either electric or arranged in the furnace flue. In an example the product gas comprises CO 27.6, H<SP>2</SP> 32.9, and N<SP>2</SP> 39.5 per cent by volume.
GB521450A 1949-05-05 1950-03-01 Improved method for the preparation of gas for use in case-hardening steel by means of carbon Expired GB683488A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR985710T 1949-05-05

Publications (1)

Publication Number Publication Date
GB683488A true GB683488A (en) 1952-11-26

Family

ID=9537586

Family Applications (1)

Application Number Title Priority Date Filing Date
GB521450A Expired GB683488A (en) 1949-05-05 1950-03-01 Improved method for the preparation of gas for use in case-hardening steel by means of carbon

Country Status (3)

Country Link
DE (1) DE816860C (en)
FR (1) FR985710A (en)
GB (1) GB683488A (en)

Also Published As

Publication number Publication date
DE816860C (en) 1951-10-15
FR985710A (en) 1951-07-23

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