GB872008A - Improvements in the heat treatment of ferrous metals - Google Patents
Improvements in the heat treatment of ferrous metalsInfo
- Publication number
- GB872008A GB872008A GB85559A GB85559A GB872008A GB 872008 A GB872008 A GB 872008A GB 85559 A GB85559 A GB 85559A GB 85559 A GB85559 A GB 85559A GB 872008 A GB872008 A GB 872008A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bath
- parts
- sulphurizing
- alkali metal
- 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
-
- 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
- C23C8/02—Pretreatment of the material to be coated
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)
Abstract
Medium carbon alloy steels are surface hardened by quenching the austenitized steel into a sulphurizing bath, held at above 500 DEG C. and containing alkali metal cyanide, alkali metal cyanate, active sulphur and, where necessary an inert diluent such as alkali metal chloride, soaking in the bath for long enough to produce the desired degree of surface hardness, and allowing to cool. The steel may be austenitized in a neutral or carburizing salt bath, or in a muffle or induction furnace, and then held for 1-2 hours in the sulphurizing bath at 560-580 DEG C. during which the austenite transforms to bainite, martensite, or a mixture of the two, the composition of the steel being chosen so that it does not transform into undesirable products at the working temperature of the bath. The treated articles may be cooled in air, gas, or warm water. The Specification includes an example of a sulphurizing bath made up by mixing 40 parts NaCN, 55 parts KCl and 40 parts Na2CO3, melting and bringing to 570 DEG C. and then adding 45 parts of sodium sulphite. After ageing for several days it contained 8.5% NaCN and 0.2% sulphur. Specifications 640,536 and 782,263 are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB85559A GB872008A (en) | 1959-01-09 | 1959-01-09 | Improvements in the heat treatment of ferrous metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB85559A GB872008A (en) | 1959-01-09 | 1959-01-09 | Improvements in the heat treatment of ferrous metals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB872008A true GB872008A (en) | 1961-07-05 |
Family
ID=9711670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB85559A Expired GB872008A (en) | 1959-01-09 | 1959-01-09 | Improvements in the heat treatment of ferrous metals |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB872008A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998029577A1 (en) * | 1997-01-03 | 1998-07-09 | Exxon Research And Engineering Company | Corrosion resistant carbon steel |
-
1959
- 1959-01-09 GB GB85559A patent/GB872008A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998029577A1 (en) * | 1997-01-03 | 1998-07-09 | Exxon Research And Engineering Company | Corrosion resistant carbon steel |
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