GB816051A - Improvements in or relating to a process for preparing a gas suitable for the case hardening of steel - Google Patents
Improvements in or relating to a process for preparing a gas suitable for the case hardening of steelInfo
- Publication number
- GB816051A GB816051A GB34800/55A GB3480055A GB816051A GB 816051 A GB816051 A GB 816051A GB 34800/55 A GB34800/55 A GB 34800/55A GB 3480055 A GB3480055 A GB 3480055A GB 816051 A GB816051 A GB 816051A
- Authority
- GB
- United Kingdom
- Prior art keywords
- vapours
- furnace
- case hardening
- gas suitable
- treatment 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)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
A gas suitable for case hardening steel or for the protection of steels from oxidation or decarburization is prepared in the furnace or treatment chamber at working temperatures, by introducing into the chamber a mixture of nitrogen and the vapour of one or mode oxygen-containing organic compounds, preferably by bubbling commercial nitrogen through the liquid compounds or mixtures thereof. Typical liquids used are methyl alcohol, ethyl alcohol, formaldehyde, acetaldehyde, acetone, ethyl methyl ketone or diethyl ketone. Further vapours, such as those of hydrocarbons, e.g. butane, ammonia amines, amides or nitriles may also be added. The conduit leading the vapours into the furnace or treatment chamber is preferably pre-heated to a temperature high enough to avoid condensation. The organic liquid is maintained at a constant temperature. When operating with more than one organic liquid substantially azeotropic mixtures are used.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR816051X | 1954-12-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB816051A true GB816051A (en) | 1959-07-08 |
Family
ID=9267597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34800/55A Expired GB816051A (en) | 1954-12-18 | 1955-12-05 | Improvements in or relating to a process for preparing a gas suitable for the case hardening of steel |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB816051A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0027649A1 (en) * | 1979-10-23 | 1981-04-29 | Air Products And Chemicals, Inc. | Protective atmosphere process for annealing and or spheroidizing ferrous metals |
| EP0031034A1 (en) * | 1979-12-20 | 1981-07-01 | Maag-Zahnräder und -Maschinen Aktiengesellschaft | Process for the adjustable carburizing or heating in a protective gas of steel work pieces |
| EP0040094A1 (en) * | 1980-05-12 | 1981-11-18 | Air Products And Chemicals, Inc. | Carburizing process utilizing atmospheres generated from nitrogen-ethanol based mixtures |
| US4386972A (en) * | 1973-10-26 | 1983-06-07 | Air Products And Chemicals, Inc. | Method of heat treating ferrous metal articles under controlled furnace atmospheres |
| CN102676752A (en) * | 2012-05-08 | 2012-09-19 | 无锡宏达热处理锻造有限公司 | Thermal treatment process for die steel H13 of automobile forged piece |
-
1955
- 1955-12-05 GB GB34800/55A patent/GB816051A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4386972A (en) * | 1973-10-26 | 1983-06-07 | Air Products And Chemicals, Inc. | Method of heat treating ferrous metal articles under controlled furnace atmospheres |
| EP0027649A1 (en) * | 1979-10-23 | 1981-04-29 | Air Products And Chemicals, Inc. | Protective atmosphere process for annealing and or spheroidizing ferrous metals |
| EP0031034A1 (en) * | 1979-12-20 | 1981-07-01 | Maag-Zahnräder und -Maschinen Aktiengesellschaft | Process for the adjustable carburizing or heating in a protective gas of steel work pieces |
| EP0040094A1 (en) * | 1980-05-12 | 1981-11-18 | Air Products And Chemicals, Inc. | Carburizing process utilizing atmospheres generated from nitrogen-ethanol based mixtures |
| US4317687A (en) | 1980-05-12 | 1982-03-02 | Air Products And Chemicals, Inc. | Carburizing process utilizing atmospheres generated from nitrogen-ethanol based mixtures |
| CN102676752A (en) * | 2012-05-08 | 2012-09-19 | 无锡宏达热处理锻造有限公司 | Thermal treatment process for die steel H13 of automobile forged piece |
| CN102676752B (en) * | 2012-05-08 | 2014-01-29 | 无锡宏达热处理锻造有限公司 | Thermal treatment process for die steel H13 of automobile forged piece |
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