DE662328C - The use of quenched and tempered austenitic-martensitic transition steel for structural parts - Google Patents
The use of quenched and tempered austenitic-martensitic transition steel for structural partsInfo
- Publication number
- DE662328C DE662328C DEK118810D DEK0118810D DE662328C DE 662328 C DE662328 C DE 662328C DE K118810 D DEK118810 D DE K118810D DE K0118810 D DEK0118810 D DE K0118810D DE 662328 C DE662328 C DE 662328C
- Authority
- DE
- Germany
- Prior art keywords
- austenitic
- tempered
- structural parts
- quenched
- martensite
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Description
DEUTSCHES REICHGERMAN EMPIRE
AUSGEGEBEN AM 12 JUU 1938ISSUED ON 12 JUU 1938
REICHSPATENTAMTREICH PATENT OFFICE
PATENTSCHRIFTPATENT LETTERING
JVl 662328 KLASSE 18d GRUPPE JVl 662328 CLASS 18d GROUP
Fried. Krupp Akt.-Ges. in Essen*)Fried. Krupp Akt.-Ges. in Essen *)
für Konstruktionsteilefor structural parts
Patentiert im Deutschen Reiche vom 5. Februar 1931 abPatented in the German Empire on February 5, 1931
Wie die Erfahrung lehrt, ist die bei Ventilkegeln für schnellaufende und hochbeanspruchte Verbrennungsmotoren, bei Warmmatrizen, Dornen und ähnlichen Gegenständen erforderliche Warmfestigkeit nur mit rein austenitischen Stählen zu erreichen. Der Nachteil der austenitischen Stahllegierungen besteht aber darin, daß ihre Festigkeit bei Raumtemperatur verhältnismäßig gering ist.Experience shows that valve cones are designed for high-speed and highly stressed applications Combustion engines, with hot matrices, thorns and similar objects required heat resistance only with pure austenitic steels. The disadvantage of the austenitic steel alloys is there but in that their strength is relatively low at room temperature.
Die Folge davon ist, daß ζ. B. bei Ventilkegeln in dem nicht erhitzten Schaft Dauerbrüche vorkommen und die Schäfte häufig einfressen.The consequence of this is that ζ. B. with valve cones in the unheated shaft fatigue fractures occur and often eat the shafts.
Die Erfindung bezweckt nun, Gegenstände der angegebenen Art zu schaffen, die von den angegebenen Nachteilen frei sind. Dieser Zweck wird der Erfindung gemäß dadurch erreicht, daß man für Konstruktionsteile, die nacheinander oder in ihren verschiedenenThe invention now aims to create objects of the specified type, which are used by the stated disadvantages are free. This purpose is thereby achieved in accordance with the invention achieved that one for structural parts that are consecutively or in their different
ao Teilen gleichzeitig bei verschiedenen Temperaturen arbeiten, die teils oberhalb, teils unterhalb des Umwiandlungspunktes Martensit-Austenit liegen, vergüteten austenitisch-martensitischen Übergangsstahl verwendet, dessen Umwandlungspunkt Martensit-Austenit beim Erwärmen unterhalb 7000 C liegt und dessen Martensit so anlaßbeständig ist, daß er bei einer Erwärmung bis zum Umwandlungspunkt keinen wesentlichen Zerfall erleidet.ao parts operate simultaneously at different temperatures, some of which are partly above, below of Umwiandlungspunktes martensite-austenite, tempered austenitic-martensitic transition steel used, the transformation point martensite-austenite located on heating below 700 0 C and the martensite is so resistant to tempering that it at does not undergo significant decay if it is heated up to the point of transition.
Stähle, die diesen Anforderungen entsprechen, sind aus dem Schrifttum bekannt (vgl. 'die Arbeit von Ehmcke, veröffentlicht im »Archiv für das Eisenhüttenwesen« 1930/31, S. 23 τι. ff.). Jedoch ist dort nur vorgeschlagen, diese Werkstoffe zur Herstellung von Schnelldrehstählen zu verwenden, was nicht den Gegenstand der Erfindung bilden soll. An Hand der oben angegebenen Regel können durch Versuche weitere Stähle dieser Art unschwer ermittelt werden. Gute Ergebnisse werden z. B. mit einem Stahl erzielt, der etwa 0,30/0 C, ι ο 0/0 Ni, 40/0 Cr und 180/0 W enthält. Wird aus diesem Stahl z. B. ein Ventilkegel hergestellt, so wird er so behandelt, daß er vor dem Einbau martensitisch.es Gefüge aufweist. Diese Behandlung besteht darin, daß er zunächst von etwa 1200° C abger schreckt wird, wobei er austenitisch wird, und dann auf etwa 8oo° C angelassen wird zur Erzielung des martensitischen Gefüges. Der Stahl erhält dabei eine Festigkeit von etwa 150 bis 160 kg/qmm neben großer Verschleißfestigkeit. In diesem Zustand wird der Ventilkegel in den Motor eingebaut und sein Schaft, der beim Betrieb des Motors nicht über den Umwandlungspunkt hinaus erhitzt wird, behält daher die vorstehend angegebene Festigkeit und Verschleißfestigkeit, so daß Dauer-Steels that meet these requirements are known from literature (cf. 'the work of Ehmcke, published in the »Archives for the Ironworks« 1930/31, P. 23 τι. ff.). However, it is only suggested there to use these materials for the production of high-speed steels, which is not the case Is to form the subject of the invention. Using the rule given above, further steels of this type can easily be tested be determined. Good results are e.g. B. achieved with a steel that is about 0.30 / 0 C, ι ο 0/0 Ni, 40/0 Cr and 180/0 W. If this steel z. B. produced a valve cone, it is treated so that it has a martensitic structure before installation. This treatment consists in that it is initially quenched from about 1200 ° C, whereby it is austenitic, and then it is tempered to about 8oo ° C Achieving the martensitic structure. The steel is given a strength of about 150 to 160 kg / sqmm in addition to great wear resistance. In this state, the valve cone is installed in the engine and its stem, which does not have the during operation of the engine Is heated beyond the transition point, therefore maintains the above-mentioned strength and wear resistance, so that long-term
*) Von dem Patentsucher ist als der Erfinder angegeben worden:*) The patent seeker stated as the inventor:
Or.-Ing. Victor Ehmcke in Essen-Hügel.Or.-Ing. Victor Ehmcke in Essen Hill.
brüche und Einfressen des Schaftes vermieden werden. Der Teller, der beim Betrieb des Motors über den' Umwandlvtngspiunkt hinausgehende Erwärmungen bis zu 8oo° C erfährt, nimmt, da der Umwandlungspunkt überschritten ist, austenitisches Gefüge an und besitzt daher die für seine Arbeitstemperatur vorteilhafte hohe Warmfestigkeit austenitischer Stähle.Breakages and pitting of the shaft can be avoided. The plate that when operating of the motor via the 'conversion point Exceeding warming up to 8oo ° C, takes, because the transition point is exceeded, has an austenitic structure and therefore has the for its working temperature advantageous high heat resistance of austenitic steels.
to .to.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEK118810D DE662328C (en) | 1931-02-05 | 1931-02-05 | The use of quenched and tempered austenitic-martensitic transition steel for structural parts |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEK118810D DE662328C (en) | 1931-02-05 | 1931-02-05 | The use of quenched and tempered austenitic-martensitic transition steel for structural parts |
Publications (1)
Publication Number | Publication Date |
---|---|
DE662328C true DE662328C (en) | 1938-07-12 |
Family
ID=7244182
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEK118810D Expired DE662328C (en) | 1931-02-05 | 1931-02-05 | The use of quenched and tempered austenitic-martensitic transition steel for structural parts |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE662328C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5873166A (en) * | 1995-07-06 | 1999-02-23 | Page; Thomas A. | Combination cigar cutter and money clip device |
-
1931
- 1931-02-05 DE DEK118810D patent/DE662328C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5873166A (en) * | 1995-07-06 | 1999-02-23 | Page; Thomas A. | Combination cigar cutter and money clip device |
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