DE1243222B - Process for the heat treatment of alloyed case-hardened steels - Google Patents
Process for the heat treatment of alloyed case-hardened steelsInfo
- Publication number
- DE1243222B DE1243222B DE1966D0049609 DED0049609A DE1243222B DE 1243222 B DE1243222 B DE 1243222B DE 1966D0049609 DE1966D0049609 DE 1966D0049609 DE D0049609 A DED0049609 A DE D0049609A DE 1243222 B DE1243222 B DE 1243222B
- Authority
- DE
- Germany
- Prior art keywords
- zone
- hardening
- minutes
- heat treatment
- case
- 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.)
- Pending
Links
Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
Description
Verfahren zur Wärmebehandlung von legierten Einsatzstählen Das Einsatzhärten der legierten Einsatzstähle, wie z. B. 16 MnCrS, 20 MnCr5, 15 CrNis usw., umfaßt im allgemeinen ein Aufkohlen in Pulver oder in Gasaufkohlungstopföfen bei einer Temperatur von etwa 900 bis 930° C, ein anschließendes langsames Abkühlen im Einsatzkasten oder im Gasaufkohlungstopf bis auf Raumtemperatur, ein Wiedererwärmen auf Härtetemperatur, .d. h. in den austenitischen Bereich, sowie das anschließende Härten. Es sind hierbei also zwei getrennte Arbeitsvorgänge erforderlich, die ein zweimaliges Erwärmen der zu härtenden Werkstücke bedingen.Process for the heat treatment of alloyed case hardening steels Case hardening the alloyed case-hardening steels, such as B. 16 MnCrS, 20 MnCr5, 15 CrNis and so on generally carburizing in powder or in gas carburizing pot furnaces at one Temperature of about 900 to 930 ° C, followed by slow cooling in the insert box or in the gas carburizing pot up to room temperature, reheating to hardening temperature, .d. H. in the austenitic area, as well as the subsequent hardening. There are here so two separate operations are required, which require two heating of the condition to be hardened workpieces.
Die bekannten Gasaufkohlungs-Durchlauföfen dienen im allgemeinen zur Behandlung von molybdänlegierten sogenannten Direkthärtestählen, wie z. B. 20 MoCr4, 25 MoCr4, 20 NiCrMo" usw., die direkt von der Einsatztemperatur ausgehend abgeschreckt werden. Eine Wiedererwärmung von Raumtemperatur auf Härtetemperatur ist hierbei also nicht erforderlich.The known gas carburizing continuous furnaces are generally used for Treatment of molybdenum alloyed so-called direct hardening steels, such as B. 20 MoCr4, 25 MoCr4, 20 NiCrMo "etc., which are quenched directly from the operating temperature will. A reheating from room temperature to hardening temperature is here so not required.
Es ist auch bereits bekannt, legierte Einsatzstähle in Gasaufkohlungs-Durchlauföfen zu behandeln. Bei den dazu verwendeten Durchlauföfen wurde zwischen Aufkohlungszone und Härtezone eine Glühzone zur Perlitbildung angeordnet. Da die Abkühlung in dieser Zone jedoch ungesteuert erfolgte, wiesen die so behandelten Einsatzstähle ein umwandlungsträges Verhalten beim anschließenden Härtevorgang auf, so daß die optimale Kernfestigkeit nicht erreicht und die Gefügeausbildung nicht einwandfrei wurde.It is also already known to use alloyed case-hardening steels in continuous gas carburizing furnaces to treat. In the case of the continuous furnaces used for this purpose, between the carburizing zone and hardening zone, an annealing zone for pearlite formation is arranged. As the cooling in this Zone, however, was uncontrolled, the case-hardened steels treated in this way were slow to transform Behavior during the subsequent hardening process, so that the optimal core strength not achieved and the structure formation was not flawless.
Versuche haben nun ergeben, daß durch eine gesteuerte Abkühlung in der Perlitisierungszone eines Gasaufkohlungs-Durchlaufofens optimale Kernfestigkeitswerte und eine einwandfreie Gefügeausbildung nachdem Härten auch bei legierten Einsatzstählen erreicht werden können.Experiments have now shown that controlled cooling in the pearlitization zone of a continuous gas carburizing furnace has optimal core strength values and perfect microstructure formation after hardening, even with alloyed case-hardened steels can be achieved.
Gemäß vorliegender Erfindung wird deshalb vorgeschlagen, bei der Behandlung von Einsatzstählen in Gasaufkohlungs-Durchlauföfen, die eine Aufkohlungszone, eine Perlitisierungszone und eine Härtezone aufweisen, die Abkühlungsgeschwindigkeit in der Perlitisierungszone so zu steuern, daß sich die Abkühlung von etwa 900 bis 930° C auf etwa 600° C über eine Zeit von mindestens 40 Minuten erstreckt und im wesentlichen gleichmäßig erfolgt, derart, daß nach 10 Minuten etwa 800° C, nach 20 Minuten etwa 730° C und nach 30 Minuten etwa 660° C erreicht sind.According to the present invention it is therefore proposed in the treatment of case-hardening steels in gas carburizing continuous furnaces, which have a carburizing zone, a Perlitization zone and a hardening zone, the cooling rate to control in the pearlitization zone so that the cooling from about 900 to 930 ° C to about 600 ° C over a period of at least 40 minutes and im takes place substantially uniformly, such that after 10 minutes about 800 ° C, after 20 minutes approx. 730 ° C and after 30 minutes approx. 660 ° C are reached.
In dem Diagramm ist eine erfindungsgemäße Abkühlungskurve dargestellt, die nach unten, :d. h. in Richtung .auf schnellere Abkühlung, nicht unterschritten werden sollte.A cooling curve according to the invention is shown in the diagram, the down,: d. H. in the direction of faster cooling, not below should be.
In dem Diagramm ist die Temperatur in ° C (in linearem Maßstab) über der Zeit in Minuten (in logarithmischem Maßstab) aufgetragen.In the diagram the temperature is in ° C (on a linear scale) above the time in minutes (on a logarithmic scale).
Durch das erfindungsgemäße Verfahren wird es möglich, legierte Einsatzstähle im Durchlaufverfahren zu behandeln und so eine wesentliche Kosteneinsparung gegenüber dem bisher üblichen Verfahren zu erzielen. Außerdem werden den Einsatzstählen Anwendungsgebiete zugänglich gemacht, die bisher den Direkthärtestählen vorbehalten waren.The method according to the invention makes it possible to produce alloyed case-hardening steels to be treated in a continuous process and thus a significant cost saving compared to to achieve the previously usual method. In addition, the case hardening steels are used made accessible that were previously reserved for direct hardening steels.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1966D0049609 DE1243222B (en) | 1966-03-16 | 1966-03-16 | Process for the heat treatment of alloyed case-hardened steels |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1966D0049609 DE1243222B (en) | 1966-03-16 | 1966-03-16 | Process for the heat treatment of alloyed case-hardened steels |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1243222B true DE1243222B (en) | 1967-06-29 |
Family
ID=7052018
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1966D0049609 Pending DE1243222B (en) | 1966-03-16 | 1966-03-16 | Process for the heat treatment of alloyed case-hardened steels |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1243222B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3828635A1 (en) * | 1988-08-24 | 1990-03-08 | Daimler Benz Ag | METHOD FOR PRODUCING CUPS FOR LIFTING PISTON MACHINES |
-
1966
- 1966-03-16 DE DE1966D0049609 patent/DE1243222B/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3828635A1 (en) * | 1988-08-24 | 1990-03-08 | Daimler Benz Ag | METHOD FOR PRODUCING CUPS FOR LIFTING PISTON MACHINES |
US4993150A (en) * | 1988-08-24 | 1991-02-19 | Daimler-Benz Ag | Process for producing cup tappets for reciprocating-piston machines |
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