GB942768A - Improvements in or relating to fused salt baths for carburising iron or steel - Google Patents
Improvements in or relating to fused salt baths for carburising iron or steelInfo
- Publication number
- GB942768A GB942768A GB38994/60A GB3899460A GB942768A GB 942768 A GB942768 A GB 942768A GB 38994/60 A GB38994/60 A GB 38994/60A GB 3899460 A GB3899460 A GB 3899460A GB 942768 A GB942768 A GB 942768A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alkali metal
- cyanide
- carbonate
- iron
- steel
- 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
- 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
- C23C8/40—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 liquids, e.g. salt baths, liquid suspensions
- C23C8/42—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 liquids, e.g. salt baths, liquid suspensions only one element being applied
- C23C8/44—Carburising
- C23C8/46—Carburising of ferrous surfaces
Abstract
A fused salt bath, for the carburization of iron or steel at 950-1100 DEG C., consists of by weight alkaline earth metal halide, e.g. BaCl2, 65-72%, alkaline earth metal carbonate, e.g. BaCO3, 5-15%, alkali metal cyanide, e.g. NaCN, 2-10%, and alkali metal carbonate, e.g. Na2CO3, as balance. Oxidation of cyanide to carbonate is controlled by providing the bath with a sealed hood and passing a non-oxidizing gas, such as coal gas, CO, CH4 or N2, through the hood, as disclosed in the divisional Specification 942,769. The bath is also preferably covered with a layer of graphite. A suitable regenerative composition is made up of the above constituents but without alkali metal carbonate and with cyanide 15-25%. Prior art baths are disclosed consisting of 40-55% alkaline earth metal halide such as BaCl2, 10-20% alkali metal cyanide, remainder alkali metal halide, and 20-50% alkali metal cyanide, remainder alkali metal carbonate and halide.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB38994/60A GB942768A (en) | 1960-11-14 | 1960-11-14 | Improvements in or relating to fused salt baths for carburising iron or steel |
| US151171A US3117038A (en) | 1960-11-14 | 1961-11-09 | Fused salt baths-composition and method for carburising |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB38994/60A GB942768A (en) | 1960-11-14 | 1960-11-14 | Improvements in or relating to fused salt baths for carburising iron or steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB942768A true GB942768A (en) | 1963-11-27 |
Family
ID=10406962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB38994/60A Expired GB942768A (en) | 1960-11-14 | 1960-11-14 | Improvements in or relating to fused salt baths for carburising iron or steel |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3117038A (en) |
| GB (1) | GB942768A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3507757A (en) * | 1966-04-04 | 1970-04-21 | Jacques Jean Caubet | Treatment of metal surfaces |
| US3635768A (en) * | 1969-04-29 | 1972-01-18 | Degussa | Molten salt carburizing process and replenishing salt for same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1980152A (en) * | 1931-03-05 | 1934-11-06 | Degussa | Fused salt bath for carburizing iron, steel, and the like |
| US1993204A (en) * | 1931-05-29 | 1935-03-05 | Degussa | Method of case hardening articles |
| US2095188A (en) * | 1934-03-12 | 1937-10-05 | Houghton Fabrik G M B H Deutsc | Iron and steel cementing bath composition |
| US2169008A (en) * | 1937-08-19 | 1939-08-08 | Houghton & Co E F | Cyanide salt bath |
| US2342104A (en) * | 1942-02-05 | 1944-02-22 | Du Pont | Manufacture of light armor plate |
-
1960
- 1960-11-14 GB GB38994/60A patent/GB942768A/en not_active Expired
-
1961
- 1961-11-09 US US151171A patent/US3117038A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US3117038A (en) | 1964-01-07 |
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