GB380428A - Improvements in or relating to the preparation of gaseous enveloping atmospheres foruse in metallurgical operations - Google Patents
Improvements in or relating to the preparation of gaseous enveloping atmospheres foruse in metallurgical operationsInfo
- Publication number
- GB380428A GB380428A GB6917/31A GB691731A GB380428A GB 380428 A GB380428 A GB 380428A GB 6917/31 A GB6917/31 A GB 6917/31A GB 691731 A GB691731 A GB 691731A GB 380428 A GB380428 A GB 380428A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gas
- temperature
- furnace
- content
- chamber
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
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)
Abstract
380,428. Annealing; cementation. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London.-(Assignees of Wilson, F. P. ; 1100, Union Street, Schenectady, New York, U.S.A.) March 5, 1931, No. 6917. Convention date, March 6, 1930. [Class 72.] A gaseous atmosphere for a metallurgical and like furnace is prepared by passing a fuel gas such as towns gas, through a heated zone, the temperature of which is so controlled that the fuel gas is rendered carburizing, neutral, or decarburizing with respect to the metal. Steam is preferably mixed with the gas in such proportions that the carbon freed in the heated zone will be completely reacted upon by the steam to form hydrogen and carbon monoxide. and in the apparatus shown the supply of steam to a mixing chamber 2 is automaticafly controlled by a temperature-responsive device 5. The mixture passes through a heat-interchanger 7a to header 11, from which tubes 15 depend into a firebrick-lined chamber having nickelchromium heating-resisters 14. The gas passes from the chamber to the furnace 17 through the pipe 16. The temperature maintained within the reaction chamber will vary according to the temperature and other conditions in the furnace, and may be between 700-1100‹ C. The gas supplied to the furnace will preferably contain a preponderant proportion of hydrogen, a smaller proportion of carbon monoxide, a minor content of nitrogen or carbon dioxide, and a small content of methane, ethane, propane or butane. Carbon monoxide is present in such proportion that it will be in chemical equilibrium with the carbon dioxide in the furnace. When the gas is to be used in a brazing furnace such as that described in Specification 265,950, [Class 51 (ii), Furnaces and kilns for applying &c.], the hydrogen and methane should be in chemical equilibrium, and the mixture should be in equilibrium with the carbon content of the steel at the operating temperature. A slightly decarbonizing atmosphere is produced by increasing the steam content or the reaction temperature, and the carbonizing effect can be increased by reducing the temperature, until at 700‹ C. the methane content may be 15 per cent. At high temperatures the hydrocarbon content of the gas may be completely cracked. When it is desired that the atmosphere should contain a substantial proportion of inactive gas such as nitrogen, some of the fuel gas may be incompletely burnt with air, and in this case a combustion chamber is fitted in the fuel gas supply line. When operating at high temperatures a combustion chamber may be used instead of the reaction chamber shown.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US380428XA | 1930-03-06 | 1930-03-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB380428A true GB380428A (en) | 1932-09-05 |
Family
ID=21897793
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6917/31A Expired GB380428A (en) | 1930-03-06 | 1931-03-05 | Improvements in or relating to the preparation of gaseous enveloping atmospheres foruse in metallurgical operations |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB380428A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1111659B (en) * | 1954-08-11 | 1961-07-27 | Steirische Gussstahlwerke | Process for annealing steels in a vacuum |
-
1931
- 1931-03-05 GB GB6917/31A patent/GB380428A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1111659B (en) * | 1954-08-11 | 1961-07-27 | Steirische Gussstahlwerke | Process for annealing steels in a vacuum |
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