GB415846A - Improvements in and relating to the hardening of steels - Google Patents
Improvements in and relating to the hardening of steelsInfo
- Publication number
- GB415846A GB415846A GB11158/33A GB1115833A GB415846A GB 415846 A GB415846 A GB 415846A GB 11158/33 A GB11158/33 A GB 11158/33A GB 1115833 A GB1115833 A GB 1115833A GB 415846 A GB415846 A GB 415846A
- Authority
- GB
- United Kingdom
- Prior art keywords
- steels
- bath
- hardening
- compounds
- oxides
- 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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/46—Salt baths
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
A bath for the hardening of steels, especially tool steels, comprises one or more alkaline or alkaline earth halides which are stable at 1000 DEG C., an amount not exceeding 10 per cent of one or more metal oxides such as magnesium or aluminium oxide or compounds adapted to form such oxides at the working temperatures of the bath, e.g. 730-1400 DEG C. and one or more boron or like compounds adapted to facilitate the solution of the metal oxides and their action at the surface of the steels, such as borax in cyrstalline form, pyrophosphates, fluorine compounds and tungstates. Examples of compounds which are reduced to oxides are magnesium carbonate and pure or natural cerium chloride. The temperatures used for the hardening are between 730 DEG C. and 1400 DEG C. and the steels after being heated in the bath are quenched and then, if desired, annealed. In an example, the bath for tool steel comprises 71 parts of barium chloride, 20 of sodium chloride, 8 of borax and 1 of magnesium oxide.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE415846X | 1932-04-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB415846A true GB415846A (en) | 1934-09-06 |
Family
ID=6448516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11158/33A Expired GB415846A (en) | 1932-04-14 | 1933-04-13 | Improvements in and relating to the hardening of steels |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB415846A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2793147A (en) * | 1954-10-07 | 1957-05-21 | Albert Erdmann & Co | Salt bath for heat treating carbon alloyed steel |
-
1933
- 1933-04-13 GB GB11158/33A patent/GB415846A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2793147A (en) * | 1954-10-07 | 1957-05-21 | Albert Erdmann & Co | Salt bath for heat treating carbon alloyed steel |
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