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DE711381C - Method of preventing oxide bloom - Google Patents

Method of preventing oxide bloom

Info

Publication number
DE711381C
DE711381C DEH151856D DEH0151856D DE711381C DE 711381 C DE711381 C DE 711381C DE H151856 D DEH151856 D DE H151856D DE H0151856 D DEH0151856 D DE H0151856D DE 711381 C DE711381 C DE 711381C
Authority
DE
Germany
Prior art keywords
preventing oxide
oxide bloom
bloom
preventing
aluminum
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
DEH151856D
Other languages
German (de)
Inventor
Dr-Ing Werner Hessenbruch
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.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Heraeus Vacuumschmelze 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 Heraeus Vacuumschmelze AG filed Critical Heraeus Vacuumschmelze AG
Priority to DEH151856D priority Critical patent/DE711381C/en
Application granted granted Critical
Publication of DE711381C publication Critical patent/DE711381C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium

Landscapes

  • Chemical & Material Sciences (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)

Description

Verfahren zum Verhüten von Oxydausblühungen Im Patent 686 244 ist ein Verfahren zum Verhüten von Oxydausblühungen auf Gegenständen aus hochhitzebeständigen Stählen mit 2 bis I6% Aluminium und gegebenenfalls Chrom bis 400/0, insbesondere' Drähten für Heizelemente, beschrieben, das darin besteht, daß die Gegenstände von Temperaturen über 700' C in öl abgeschreckt werden.Method for preventing oxide efflorescence In the patent 686 244 a method for preventing oxide efflorescence on objects made of heat-resistant steels with 2 to 16% aluminum and optionally chromium up to 400/0, in particular 'wires for heating elements, is described, which consists in that the objects be quenched from temperatures above 700 ° C in oil.

Beispielsweise wird in der Beschreibung des Hauptpatents die Abschrecktemperatur von 7 5 0' C angegeben sowie als Glühtemperatur, von der aus das Abschrecken erfolgen kann, 6oo bis 8oo° C.For example, in the description of the main patent, the quenching temperature is given as 75 ° C. and the annealing temperature from which the quenching can take place is 600 to 8oo ° C.

Die weiteren Versuche des Erfinders haben nun ergeben, daß es vorteilhaft ist, mit dieser Abschrecktemperatur auch in manchen Fällen noch höher zu gehen. Die obere Grenze der Abschrecktemperatur ist dadurch bedingt, daß das Korn der Legierungen gerade noch nicht anfangen darf zu wachsen. Eine Kornvergröberung tritt aber bei manchen Legierungen, insbesondere bei Chrom - Eisen - Aluminium-Legierungen, erst bei etwa IIoo° C ein, so daß man die Abschrecktemperatur bis in die Gegend von IIoo°C steigern kann und sie mit Sicherheit bis auf 9oo bis Iooo°C treiben kann. Durch diese Abschreckung werden Oxydausblühungen vermieden, welche auf hochhitzebeständigen ferritischen Stählen mit 2 bis I6% Aluminium und gegebenenfalls bis zu 400/0 Chrom gelegentlich auftreten.The inventor's further experiments have now shown that it is advantageous is to go even higher with this quenching temperature in some cases. The upper limit of the quenching temperature is due to the fact that the grain of the alloys just not allowed to start growing. A grain coarsening occurs, however some alloys, especially chromium - iron - aluminum alloys at about 100 ° C, so that the quenching temperature is in the region of 100 ° C can increase and it can certainly drive up to 9oo to Iooo ° C. By this deterrent prevents oxide efflorescence, which occurs on highly heat-resistant ferritic steels with 2 to 16% aluminum and possibly up to 400/0 chromium Occasionally occur.

Claims (1)

PATENTANSPRUCH: Verfahren zum Verhüten von Oxydaus-
2 bis 160,1o Aluminium und gegebenenfalls bis zu 4o% Chrom, insbesondere Drähten für Heizelemente, nach Patent 686244, ,dadurch gekennzeichnet, daß die Gegenstände von Temperaturen über 8oo bis IIoo°C, vorzugsweise bis Iooo°C, in Öl abgeschreckt werden.PATENT CLAIM: Method for preventing oxide build-up
2 to 160.1o aluminum and optionally up to 40% chromium, in particular wires for heating elements, according to patent 686244, characterized in that the objects are quenched in oil at temperatures above 800 to 100 ° C, preferably up to 100 ° C.
DEH151856D 1937-06-03 1937-06-03 Method of preventing oxide bloom Expired DE711381C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEH151856D DE711381C (en) 1937-06-03 1937-06-03 Method of preventing oxide bloom

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH151856D DE711381C (en) 1937-06-03 1937-06-03 Method of preventing oxide bloom

Publications (1)

Publication Number Publication Date
DE711381C true DE711381C (en) 1941-09-30

Family

ID=7181271

Family Applications (1)

Application Number Title Priority Date Filing Date
DEH151856D Expired DE711381C (en) 1937-06-03 1937-06-03 Method of preventing oxide bloom

Country Status (1)

Country Link
DE (1) DE711381C (en)

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