GB975202A - Improvements in process for chromizing and product - Google Patents

Improvements in process for chromizing and product

Info

Publication number
GB975202A
GB975202A GB2002262A GB2002262A GB975202A GB 975202 A GB975202 A GB 975202A GB 2002262 A GB2002262 A GB 2002262A GB 2002262 A GB2002262 A GB 2002262A GB 975202 A GB975202 A GB 975202A
Authority
GB
United Kingdom
Prior art keywords
retort
chromium
gas
chromizing
source
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
GB2002262A
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.)
Alloy Surfaces Co Inc
Original Assignee
Alloy Surfaces Co Inc
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 Alloy Surfaces Co Inc filed Critical Alloy Surfaces Co Inc
Publication of GB975202A publication Critical patent/GB975202A/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C10/00Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/06Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases
    • C23C10/08Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases only one element being diffused
    • C23C10/10Chromising
    • C23C10/12Chromising of ferrous surfaces
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C10/00Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/28Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
    • C23C10/34Embedding in a powder mixture, i.e. pack cementation

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 Strip Materials And Filament Materials (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

In a process of chromizing ferrous material in a closed retort at 1500 - 2300 DEG F. a gas containing at least 2% by volume of a halogen, preferably in a hydrogen carrier, is continuously circulated through a source of chromium and the ferrous material, which is out of contact with the chromium source. The chromizing gas <PICT:0975202/C6-C7/1> is preferably hydrogen bromide, chromous bromide or bromine or a mixture of halides and the chromium source may be chromium or ferrochromium in the form of minus 1/4 inch plus 60 mesh pieces. The dew point of the exit gases from the retort should not be more than +5 DEG F. and preferably should be lower than -40 DEG F. The ferrous material treated should have a maximum carbon content of 0.03% and may be silicon steel, chromium and nickel stainless steel or steels stabilized with titanium, niobium, vanadium or tantalum. Prior to chromizing the steel may be decarburized in the retort by treating at 1300 - 1400 DEG F. with wet hydrogen. In one embodiment, Fig. 1, of a batch process, open coil steel strip 38 is supported by a grid 35 of plenum chamber 31 in a bell type furnace retort 54. The chromium source is supported in stacked trays 40 and the halogen gas is supplied via inlet 61 and circulated by fan 25 through the chromium and the coil, a series of baffles directing the gas through the coil in the direction of the arrows. The source of chromium may alternatively be in the form of a porous bell, Fig. 8 (not shown), or as a filling in the hollow core of the ferrous coil, Fig. 9 (not shown). In a continuous process shown in Fig. 4 steel strip or wire is continuously passed through perforated tubes 75 enclosed in a sealed retort 74 the space between the tubes being packed with the source of chromium 85. The circulating gas is supplied via inlet 96 and the treated wires are removed from plugs 92. In another embodiment, Fig. 6 <PICT:0975202/C6-C7/2> (not shown), a shaker hearth extends into the retort and conveys the workpieces into the retort for continuous treatment with the chromizing atmosphere and the treated pieces are then quenched directly in a quenching tank. In the batch type process the chromized work may be given a heat treatment in the same retort, the halogen gas being first purged and the heat treatment effected in hydrogen or other carrier gas. In the continuous process the heat treatment is effected in a separate furnace free of halogen gas or a non-chromizing flushing gas may be introduced into the discharge end of the continuous retort.
GB2002262A 1961-06-23 1962-05-24 Improvements in process for chromizing and product Expired GB975202A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US11908561A 1961-06-23 1961-06-23
US16076461A 1961-12-20 1961-12-20
US17223162A 1962-02-09 1962-02-09

Publications (1)

Publication Number Publication Date
GB975202A true GB975202A (en) 1964-11-11

Family

ID=27382251

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2002262A Expired GB975202A (en) 1961-06-23 1962-05-24 Improvements in process for chromizing and product

Country Status (2)

Country Link
DE (1) DE1446094A1 (en)
GB (1) GB975202A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992008821A1 (en) * 1990-11-10 1992-05-29 MTU MOTOREN- UND TURBINEN-UNION MüNCHEN GMBH Device for coating hollow workpieces by gas diffusion
GB2256876A (en) * 1991-06-18 1992-12-23 Mtu Muenchen Gmbh Aluminium gas diffusion coating using heated aluminium particles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050064095A1 (en) * 2003-09-19 2005-03-24 Deere & Company, A Delaware Corporation Method for applying wear and corrosion resistant coating to cast iron

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992008821A1 (en) * 1990-11-10 1992-05-29 MTU MOTOREN- UND TURBINEN-UNION MüNCHEN GMBH Device for coating hollow workpieces by gas diffusion
US5439525A (en) * 1990-11-10 1995-08-08 Mtu Motoren- Und Turbinen-Union Muenchen Gmbh Device for coating hollow workpieces by gas diffusion
GB2256876A (en) * 1991-06-18 1992-12-23 Mtu Muenchen Gmbh Aluminium gas diffusion coating using heated aluminium particles
GB2256876B (en) * 1991-06-18 1995-03-22 Mtu Muenchen Gmbh Method of gas diffusion coating

Also Published As

Publication number Publication date
DE1446094A1 (en) 1969-03-27

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