DE539078C - Process for bright annealing of metals - Google Patents

Process for bright annealing of metals

Info

Publication number
DE539078C
DE539078C DES73158D DES0073158D DE539078C DE 539078 C DE539078 C DE 539078C DE S73158 D DES73158 D DE S73158D DE S0073158 D DES0073158 D DE S0073158D DE 539078 C DE539078 C DE 539078C
Authority
DE
Germany
Prior art keywords
nitrogen
hydrogen
metals
protective gas
bright annealing
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
Application number
DES73158D
Other languages
German (de)
Inventor
Ulrich Aschmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Schuckertwerke AG
Siemens AG
Original Assignee
Siemens Schuckertwerke AG
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Schuckertwerke AG, Siemens AG filed Critical Siemens Schuckertwerke AG
Priority to DES73158D priority Critical patent/DE539078C/en
Application granted granted Critical
Publication of DE539078C publication Critical patent/DE539078C/en
Expired legal-status Critical Current

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

Description

Verfahren zum Blankglühen von Metallen Lm das beim Glühen von Metallen eintretende Oxv dieren zu verhindern, ist es bekannt, das Glühen in einer Schutzgasatmosphäre vorzunehmen, die aus einem neutralen Gas besteht. Als solches wird vorwiegend Wasserstoff verwendet. Dieses Gas ist jedoch teuer, und außerdem ist seine Verwendung gefährlich, da es brennbar und explosiv ist. Man versuchte bereits den billigen, unbrennbaren Stickstoff als Schutzgas zu verwenden, doch ging man davon wieder ab, da der im Handel erhältliche Stickstoff durch Sauerstoff verunreinigt ist und infolgedessen auf das Glühgut oxydierend wirkt.Method for bright annealing of metals Lm that in the annealing of metals To prevent oxv dieren occurring, it is known to glow in a protective gas atmosphere made, which consists of a neutral gas. As such it becomes predominantly hydrogen used. However, this gas is expensive, and besides, its use is dangerous, since it is flammable and explosive. The cheap, incombustible one has already been tried To use nitrogen as a protective gas, but it was abandoned again because the im Commercially available nitrogen is contaminated by oxygen and as a result has an oxidizing effect on the material to be annealed.

Die Erfindung betrifft nun ein Verfahren zur Beseitigung der oxydierenden Wirkung des handelsüblichen Stickstoffes, durch das seine Verwendung als Schutzgas beim Blankglühen von Metallen ermöglicht wird. Gemäß der Erfindung wird dies dadurch erreicht, daß dem Stickstoff Wasserstoffgas beigemengt wird. Durch diese Beimengung wird der Stickstoff neutralisiert, so daß er sich trotz des in ihm enthaltenen Sauerstoffes dem Glühgut gegenüber indifferent verhält. Am vorteilhaftesten ist eine Wasserstoffbeimengung in doppelter Höhe des prozentualen Sauerstoffgehaltes des verunreinigten Stickstoffes.The invention now relates to a method for eliminating the oxidizing Effect of the commercially available nitrogen, through which its use as a protective gas when bright annealing of metals is made possible. In accordance with the invention, this is achieved achieves that hydrogen gas is added to the nitrogen. Through this admixture the nitrogen is neutralized, so that it is in spite of the oxygen it contains behaves indifferently to the material to be annealed. It is most advantageous to add hydrogen twice the percentage oxygen content of the contaminated nitrogen.

Für den Fall, daß vom Schutzgas eine reduzierende Wirkung verlangt wird, z. B. beim Glühen von angerosteten Blechen, kann dem Stickstoff eine über das Doppelte des prozentualen Sauerstoffgehaltes hinausgehende Menge Wasserstoff beigefügt werden.In the event that the protective gas requires a reducing effect will, e.g. B. when glowing rusted metal sheets, the nitrogen can one over the amount of hydrogen exceeding twice the percentage of oxygen attached.

Da bei einem Zusatz von mehr als io "/" Wasserstoff das Schutzgas im Falle des Luftzutrittes explosiv wird, ist es zweckmäßig, den gesamten Wasserstoffzusatz unter io "/a des Stickstoffvolumens zu halten.Since with an addition of more than io "/" hydrogen the protective gas in the event that air becomes explosive, it is advisable to add all of the hydrogen to keep below io "/ a of the nitrogen volume.

Claims (3)

PATENTANSPRÜCHE: i. Verfahren zum Blankglühen von Metallen, unter Verwendung von. handelsüblichem Stickstoff als Schutzgas, dadurch gekennzeichnet, daß dem Stickstoff zur Kompensierung des Sauerstoffgehaltes Wasserstoff zugesetzt wird. PATENT CLAIMS: i. Process for bright annealing of metals, under Use of. commercial nitrogen as protective gas, characterized that hydrogen was added to the nitrogen to compensate for the oxygen content will. 2. Schutzgas nach Anspruch i, dadurch gekennzeichnet, daß der Wasserstoffzusatz den doppelten Prozentsatz des Sauerstoffgehaltes des Stickstoffes beträgt. 2. Protective gas according to claim i, characterized in that the addition of hydrogen is twice the percentage of the oxygen content of nitrogen. 3. Schutzgas nach Anspruch i für Glühung in reduzierender Atmosphäre, dadurch-gekennzeichnet, daß dem Stickstoff mehr als der doppelte Prozentsatz des Sauerstoffgehaltes an Wasserstoff zugesetzt wird. Schutzgas nach Anspruch i bis 3, dadurch gekennzeichnet, daß die gesamte Wasserstoffbeimengung io °1" des Gasvolumens nicht übersteigt.3. Inert gas according to claim i for annealing in a reducing atmosphere, characterized that the nitrogen has more than twice the percentage of the oxygen content of hydrogen is added. Protective gas according to Claims i to 3, characterized in that the total hydrogen admixture does not exceed 10 ° 1 "of the gas volume.
DES73158D 1926-02-05 1926-02-05 Process for bright annealing of metals Expired DE539078C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DES73158D DE539078C (en) 1926-02-05 1926-02-05 Process for bright annealing of metals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES73158D DE539078C (en) 1926-02-05 1926-02-05 Process for bright annealing of metals

Publications (1)

Publication Number Publication Date
DE539078C true DE539078C (en) 1931-11-27

Family

ID=7503706

Family Applications (1)

Application Number Title Priority Date Filing Date
DES73158D Expired DE539078C (en) 1926-02-05 1926-02-05 Process for bright annealing of metals

Country Status (1)

Country Link
DE (1) DE539078C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE905615C (en) * 1943-12-04 1954-03-04 Eisenwerke Muelheim Meiderich Production of a lean gas suitable for metal powder reduction and for the bright annealing process
DE931411C (en) * 1940-10-09 1955-08-08 Armco Int Corp Process to increase the cold formability with low core losses of Si steel sheets

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE931411C (en) * 1940-10-09 1955-08-08 Armco Int Corp Process to increase the cold formability with low core losses of Si steel sheets
DE905615C (en) * 1943-12-04 1954-03-04 Eisenwerke Muelheim Meiderich Production of a lean gas suitable for metal powder reduction and for the bright annealing process

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