CH251936A - Process for the production of heat and long-term resistant steels by wind freshening. - Google Patents

Process for the production of heat and long-term resistant steels by wind freshening.

Info

Publication number
CH251936A
CH251936A CH251936DA CH251936A CH 251936 A CH251936 A CH 251936A CH 251936D A CH251936D A CH 251936DA CH 251936 A CH251936 A CH 251936A
Authority
CH
Switzerland
Prior art keywords
wind
freshening
production
long
heat
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellschaft Gebr Boe Co
Original Assignee
Boehler & Co Ag Geb
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 Boehler & Co Ag Geb filed Critical Boehler & Co Ag Geb
Publication of CH251936A publication Critical patent/CH251936A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Ceramic Products (AREA)

Description

  

      Verfahren    zur Herstellung warm- und     dauerstandfester        Stähle    durch     Windfrischen.       Es ist     bekannt,    dass Stähle, die nach  einem     Windfrischverfahren    in     der    Birne     her-          gestellt    worden sind, :einen um     0,0'1%    .gele  genen     Sti@ckgtoffgehalt,        herrühTeii#d    von der       beim        Frischen        zugeführten    Luft, aufweisen.  



  Es wurde nun     überraschenderweise    gefun  den, dass     durch    die     Anwesenheit        von    gerin  gen Mengen an im     Stahl        schwerlöslichen          Nitriden    von     Elementen,der    3. und 4.

   Gruppe  des periodischen Systems die nach einem       Windfrisahverfahren,hergeistellten    Stähle die       Eigenschaften    der     Warmf        esstigkeit    und       Dauerstandfestigkeiterhailten.        DieseErkennt-          nis    macht es möglich,

   auf     einfachem    und bil  ligem Wege     warmfeste        Stähle    im grossen  unter Ersparung der bisher     hiefür    verwen  deten     kostspieligen    und schwer zu     beschaf-          fenden        Zusatzmetalle,    von denen überdies  noch     verhältnismässig        grosse    Mengen erfor  derlich waren, herstellen zu können. Beson  ders wirksam     sind        hierfür        Zirkon    und Titan.  Im geringen     Masse    wirkt auch Aluminium.

    Der Zusatz -dieser     Metalle        erfolgt    am besten  in     derselben    Weise, wie. man beim     Zusatz    von       Desogydatione-    und     Denitrierungsmitteln    vor  geht.

       Die    für die     Erreichung        der        Warm-          festigkeit        und        Dauerstandfestigkeit        erfor-          *derlichen    Mengen an     sohwerlösliche        Nitride     bildenden     Elementen    sind     ausserordentlich     gering.

   Um eine     erhebliche    Wirkung zu er  reichen, genügen     schon    die im     Wiudfrisch-          staöhl    an     sich    vorhandenen     Stickstoffgehalte.          Vorzub        .weise    beträgt der an die schwerlös-         hohen        Nitride        .gebundene    Stickstoffgehalt       0,00,20,1    %.

   Auf     diese    Weise     gelingt        es,     den     Stickstoff    der     Windfrischstähle    zu einem       nützl'ich.en    Legierungselement zu     machen.     Es     ist    möglich, auf     diese    Weise     Dauer-          standfestigkeiten    zu erreichen, die, nach  dem     DVM-Verfahren    bei     5-0,0     C     gemessen,     20     kg/mrm'    betragen können.



      Process for the production of heat and long-term resistant steels by wind freshening. It is known that steels which have been manufactured in the pear by a wind-freshening process: have a metal content of around 0.0-1%, which is partly due to the air supplied during freshening.



  It has now been found, surprisingly, that due to the presence of small amounts of nitrides of elements that are sparingly soluble in steel, the 3rd and 4th

   Group of the periodic table, the steels manufactured by a wind frisehing process, the properties of the hot strength and creep strength. This realization makes it possible

   to be able to manufacture heat-resistant steels on a large scale in a simple and inexpensive way while saving the expensive and difficult to obtain additional metals previously used for this purpose, of which relatively large quantities were also required. Zirconium and titanium are particularly effective for this. Aluminum also has a minor effect.

    The addition of these metals is best done in the same way as. one proceeds when adding desogydation and denitration agents.

       The quantities of insoluble nitride-forming elements necessary to achieve the heat resistance and creep strength are extremely small.

   In order to achieve a considerable effect, the nitrogen contents already present in the freshly made steel are sufficient. As a preliminary step, the nitrogen content bound to the nitrides, which are difficult to dissolve, is 0.00.20.1%.

   In this way it is possible to turn the nitrogen in the wind-fresh steels into a useful alloying element. It is possible in this way to achieve fatigue strengths which, measured according to the DVM method at 5-0.0 C, can amount to 20 kg / mrm '.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung warm- und dauerstandfester Stähle -durch Windfrischen, dadurch gekennzelchnet, dass mindestens ein im Stahl echwerlösliches Nitrid von Elemen ten der 3. und 4. Gruppe des, periodischen Systems gebildet wird. PATENT CLAIM: Process for the production of high-temperature and long-term resistant steels -by wind freshening, characterized in that at least one nitride that is sparingly soluble in the steel is formed by elements of the 3rd and 4th group of the periodic system. UNTERANSPRÜCHE: 1. Verfahrnen nach Patentanspruch, da- dureh gekennzeichnet"d@ass der an die schwer löslichen Nitride gebundene Stickstoffgehalt 0,002-0,170 beträgt. 2. Verfahren nach Patenitanssprwch, da durch gekennzeiühnet, dass Titannitrid gebil det wird. 3. SUB-CLAIMS: 1. Method according to patent claim, characterized in that "that the nitrogen content bound to the sparingly soluble nitrides is 0.002-0.170. 2. Method according to the patent claim, as it indicates that titanium nitride is formed. 3. Verfahren nach Patentanspruch, da .durch gekennzeichnet, dass Zirkonnitrid ge bildet wird. 4. Verfahren nach Patentanspruch, da- durch gekennzeichnet, dass Aluminiumnitrid .gebildet wird. Method according to patent claim, characterized in that zirconium nitride is formed. 4. The method according to claim, characterized in that aluminum nitride is formed.
CH251936D 1944-05-22 1944-11-15 Process for the production of heat and long-term resistant steels by wind freshening. CH251936A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE251936X 1944-05-22

Publications (1)

Publication Number Publication Date
CH251936A true CH251936A (en) 1947-11-30

Family

ID=5945482

Family Applications (1)

Application Number Title Priority Date Filing Date
CH251936D CH251936A (en) 1944-05-22 1944-11-15 Process for the production of heat and long-term resistant steels by wind freshening.

Country Status (1)

Country Link
CH (1) CH251936A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1076161B (en) * 1955-11-02 1960-02-25 Roechlingsche Eisen & Stahl Use of a steel for electromagnetically stressed objects with low coercive force, e.g. B. Pole shoes and relay parts

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1076161B (en) * 1955-11-02 1960-02-25 Roechlingsche Eisen & Stahl Use of a steel for electromagnetically stressed objects with low coercive force, e.g. B. Pole shoes and relay parts

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