GB975202A - Improvements in process for chromizing and product - Google Patents
Improvements in process for chromizing and productInfo
- 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
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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/06—Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases
- C23C10/08—Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases only one element being diffused
- C23C10/10—Chromising
- C23C10/12—Chromising of ferrous surfaces
-
- 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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
- C23C10/34—Embedding 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.
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)
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)
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 |
-
1962
- 1962-05-24 GB GB2002262A patent/GB975202A/en not_active Expired
- 1962-06-22 DE DE19621446094 patent/DE1446094A1/en active Pending
Cited By (4)
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 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2257668A (en) | Formation of protective layers on iron and steel articles | |
GB975202A (en) | Improvements in process for chromizing and product | |
US1979820A (en) | Heat treatment | |
US2998303A (en) | Method for purifying hydrogen contaminated with methane | |
US2389497A (en) | Production of electrical silicon steel | |
US2032963A (en) | Method of coloring and hardening steel | |
US5783000A (en) | Method for heat treatment of steel, and products of steel | |
US1901039A (en) | Process of bright annealing steels and alloys | |
US2229642A (en) | Process of making electrical sheets | |
US3183888A (en) | Apparatus for surface coating of strip metal or the like | |
ES256253A1 (en) | Improvements relating to heat treatment furnaces | |
ES8106762A1 (en) | Process for treating metals using recycled gases | |
US3470035A (en) | Heat treatment of metal | |
GB742063A (en) | Improvements in and relating to the manufacture of tungsten filaments | |
JPS5760018A (en) | Heat treatment installation for metal | |
Nicoloff et al. | Localized breakage by 2, 3, 5-Tris-ethylenimino-1, 4-benzoquinone in barley chromosomes | |
US3353806A (en) | Apparatus for annealing continuous metal bands in a vacuum | |
US2307522A (en) | Bright-finish metal-treating furnace | |
US3353936A (en) | Chromized ferrous article | |
GB801463A (en) | Process for annealing steel in a vacuum | |
US3668022A (en) | Method of treating an alloy steel for enameling | |
GB833925A (en) | A process and apparatus for the vacuum treatment of steel or steel alloy | |
US2417558A (en) | Method of and apparatus for manufacturing nitrogen | |
JPS5992020A (en) | Non-oxidative heat treatment apparatus | |
SU105665A1 (en) | Protective atmosphere for heat treatment of products from nickel-based superalloys |