AT162875B - Process for the production of unalloyed or alloyed sintered steel bodies with a carbon content of 0¨4 to 0¨9% - Google Patents
Process for the production of unalloyed or alloyed sintered steel bodies with a carbon content of 0¨4 to 0¨9%Info
- Publication number
- AT162875B AT162875B AT162875DA AT162875B AT 162875 B AT162875 B AT 162875B AT 162875D A AT162875D A AT 162875DA AT 162875 B AT162875 B AT 162875B
- Authority
- AT
- Austria
- Prior art keywords
- unalloyed
- carbon content
- production
- steel bodies
- sintered steel
- Prior art date
Links
Description
<Desc/Clms Page number 1>
Verfahren zum Herstellen von unlegierten oder legierten Sinterstahlkörpern mit einem
Kohlenstoffgehalt von 0. 4 bis 0. 9%
EMI1.1
Das Ergebnis dieser Massnahme ist eine wesentliche Verbesserung der Bearbeitbarkeit der Sinterkörper durch spanabhebende Werkzeuge, wie Bohrer, Fräser od. dgl. Die mechanischen Eigenschaften der Körper ändern sich in der Weise, dass die Dehnung heraufgesetzt wird, u. zw. um etwa 100%, während die Festigkeit um etwa 5 bis 10% zurückgeht, verglichen mit solchen Körpern, die ohne Anwendung der abschliessenden Wärmebehandlung hergestellt worden sind. Wesentlich ist, dass diese verbesserten mechanischen Eigenschaften gleichmässig für einen gesamten Pulveransatz erreicht werden und bei gleichbleibender Pulverzusammensetzung auch bei weiteren Chargen leicht wiederholbar eingehalten werden können.
Es ist vielfach auch üblich, bei der Herstellung von Sinterstahlkörpem eine sogenannte Doppelsinterung durchzuführen. Diese besteht darin, dass der durch Pressen in der Kälte geformte Körper bei 700 bis 1000 0 C vorgesintert und sodann durch Pressen in Formgesenken nachverdichtet wird ; nach diesem zweiten Pressen wird die Fertigsinterung bei 1150 bis 1300 C vor- genommen. Auch diese Stahlkörper haben die Nachteile, dass sie schwer bearbeitbar sind und die Gleichmässigkeit der mechanischen Eigenschaften zu wünschen übrig lässt. Sie können bezüglich der Bearbeitbarkeit und der Güte der mechanischen Eigenschaften ebenfalls verbessert werden, wenn an die Doppelsinterung die Wärmenachbehandlung gemäss der Erfindung angeschlossen wird.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
<Desc / Clms Page number 1>
Process for producing unalloyed or alloyed sintered steel bodies with a
Carbon content from 0.4 to 0.9%
EMI1.1
The result of this measure is a significant improvement in the machinability of the sintered body by cutting tools such as drills, milling cutters or the like. The mechanical properties of the body change in such a way that the elongation is increased, u. between about 100%, while the strength is reduced by about 5 to 10%, compared with those bodies which have been produced without applying the final heat treatment. It is essential that these improved mechanical properties are achieved uniformly for an entire powder batch and, with the powder composition remaining the same, can be maintained easily and repeatedly for further batches.
It is also common practice to carry out what is known as double sintering in the production of sintered steel bodies. This consists in the fact that the body formed by pressing in the cold is pre-sintered at 700 to 1000 ° C. and then re-compacted by pressing in molding dies; After this second pressing, the final sintering is carried out at 1150 to 1300 C. These steel bodies also have the disadvantages that they are difficult to machine and that the uniformity of the mechanical properties leaves something to be desired. They can also be improved with regard to the machinability and the quality of the mechanical properties if the double sintering is followed by the heat treatment according to the invention.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT162875T | 1946-03-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT162875B true AT162875B (en) | 1949-04-25 |
Family
ID=3651913
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT162875D AT162875B (en) | 1946-03-04 | 1946-03-04 | Process for the production of unalloyed or alloyed sintered steel bodies with a carbon content of 0¨4 to 0¨9% |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT162875B (en) |
-
1946
- 1946-03-04 AT AT162875D patent/AT162875B/en active
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