DE539481C - Process for hardening steel and cast iron alloys in a nitrogen-releasing atmosphere - Google Patents
Process for hardening steel and cast iron alloys in a nitrogen-releasing atmosphereInfo
- Publication number
- DE539481C DE539481C DEK112735D DEK0112735D DE539481C DE 539481 C DE539481 C DE 539481C DE K112735 D DEK112735 D DE K112735D DE K0112735 D DEK0112735 D DE K0112735D DE 539481 C DE539481 C DE 539481C
- Authority
- DE
- Germany
- Prior art keywords
- nitriding
- nitrogen
- cast iron
- iron alloys
- hardening steel
- 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
- 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
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Description
Verfahren zum Härten von Stahl- und Gußeisenlegierungen in einer Stickstoff abgebenden Atmosphäre Die Erfindung bezieht sich auf Verfahren zum Härten von Stahl- und Gußeisenlegierungen in einer Stickstoff abgebenden Atmosphäre (die sogenannte Nitrierhärtung) und bezweckt, ein Verfahren zu finden, bei dessen Anwendung unter sonst gleichen Umständen in einer bestimmten Zeit eine größere Nitriertiefe erreicht wird als bei den bekannten Verfahren. Dieser Zweck wird der Erfindung gemäß dadurch erreicht, daß deni den Nitrierbehälter langsam, z. B. in etwa 2 bis 3 Stunden, durchströmenden Gase durch einen Propeller eine lebhafte Wirbelbewegung erteilt wird.Process for hardening steel and cast iron alloys in a nitrogen emitting atmosphere The invention relates to a method for hardening steel and cast iron alloys in a nitrogen-releasing atmosphere (the so-called Nitriding) and the aim is to find a method that can be used under otherwise under the same circumstances, a greater nitriding depth is achieved in a certain time is used as with the known method. This purpose is thereby achieved in accordance with the invention achieved that deni the nitriding slowly, z. B. in about 2 to 3 hours flowing through A lively vortex motion is given to gases by a propeller.
Das den Gegenstand der Erfindung bildende Verfahren kann z. B. in folgender Weise ausgeübt werden.The method forming the subject of the invention can, for. Am be exercised in the following manner.
Die durch Nitrierung zu härtenden Werkstücke aus zum Nitrieren geeigneten Stahl-oder Gußeisenlegierungen werden in einen fest verschlossenen Behälter gepackt und in diesem Behälter in den auf Nitriertemperatur erhitzten Ofen eingesetzt. lii den Behälter wird durch ein Einlaßrohr Ammoniak eingeleitet. Dem in den Behälter eingetretenen Ammoniak wird nun im Behälter eine solche Wirbelbewegung erteilt, daß eine möglichst große Gasmenge mit den zu nitrierenden Oberflächen der Werkstücke in Berührung kommt. Am Behälter befindet sich noch ein Auslaßrohr, durch das das Gas, nachdem es einen Teil seines Stickstoffs abgegeben hat, den Behälter verlassen kann.The workpieces to be hardened by nitriding made of suitable for nitriding Steel or cast iron alloys are packed in a tightly closed container and placed in this container in the furnace heated to nitriding temperature. lii Ammonia is introduced into the container through an inlet pipe. That in the container If ammonia has entered, such a vortex movement is now given in the container, that the largest possible amount of gas with the surfaces to be nitrided of the workpieces comes into contact. There is also an outlet pipe on the container through which the Gas, after releasing some of its nitrogen, leave the container can.
Die lebhafte Wirbelbewegung des im Behälter befindlichen Gases hat zur Folge, daß möglichst viel Gas mit den zu nitrierenden Oberflächen in Berührung kommt und daß daher eine intensivere Nitrierung vor" sich geht, als wenn das Gas, wie das bisher üblich war, den Behälter in ganz langsamem Lauf durchströmt.The lively swirling motion of the gas in the container has As a result, as much gas as possible comes into contact with the surfaces to be nitrided and that a more intensive nitration takes place than when the gas as has been the norm up to now, the container flows through very slowly.
Die dem Ammoniak im Behälter zu erteilende lebhafte Bewegung wird nach der vorliegenden Erfindung mittels eines Propellers erzielt, der in den Nitrierbehälter eingebaut ist.The vigorous agitation to be imparted to the ammonia in the container becomes achieved according to the present invention by means of a propeller, which in the nitriding tank is built in.
Die ständige Durchwirbelung der den Nitrierbehälter langsam, in etwa 2 bis 3 Stunden, durchströmenden Gasmenge - der Nitriervorgang selbst dauert z. B. 5 bis zoo Stunden - bewirkt, daß sich an den Oberflächen der zu nitrierenden Stücke keine Schichten bilden können, die aus zersetztem Gas bestehen. was, namentlich bei sehr großen Nitrierbehältern, besonders in toten Winkeln des Behälters sonst leicht eintreten kann; es kommen vielmehr ständig andere Gasteilchen mit jedem Teil der Oberfläche der zu nitrierenden Stücke zusammen, so daß' unter sonst gleichen Verhältnissen eine gleichaäßige -und im- übrigen -größere Nitriertiefe in einer bestimmten Zeit erzielt wird.The constant vortexing of the nitriding tank slowly, roughly 2 to 3 hours, amount of gas flowing through - the nitriding process itself takes z. B. 5 to zoo hours - causes the surfaces to be nitrided Pieces cannot form layers made up of decomposed gas. what, by name with very large nitriding tanks, especially in blind spots of the tank otherwise can easily enter; rather, other gas particles are constantly coming with each part the surface of the too nitriding pieces together so that 'under otherwise the same conditions have an equal - and otherwise - greater nitriding depth is achieved in a certain time.
Es war bereits bekannt, kaltes Ammoniakgas auf die zwecks Rostsicherheit zu verstickenden Gegenstände aufzublasen. Dieses vorbekannte, wegen des hohen Gasverbrauchs an sich schon unwirtschaftliche Verfahren eignet sich aber zum Härten durch Versticken schon deshalb nicht, weil das Aufblasen des kalten Ammoniaks die Temperatur des zu härtenden Stückes in der 5 bis iooStunden dauernden Nitrierzeit unzulässig verringern würde (im Nitrierbehälter der Erfindung schwankt die Temperatur höchstens um -f- io° C).It was already known to use cold ammonia gas to prevent rust Inflate items to be embroidered. This previously known, because of the high gas consumption Processes, which are already uneconomical in themselves, are, however, suitable for hardening by embroidering if only because the inflation of the cold ammonia increases the temperature of the to be hardened in the nitriding time of 5 to 100 hours would (in the nitriding vessel of the invention the temperature fluctuates by no more than -f- io ° C).
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEK112735D DE539481C (en) | 1928-12-21 | 1928-12-21 | Process for hardening steel and cast iron alloys in a nitrogen-releasing atmosphere |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEK112735D DE539481C (en) | 1928-12-21 | 1928-12-21 | Process for hardening steel and cast iron alloys in a nitrogen-releasing atmosphere |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE539481C true DE539481C (en) | 1931-11-26 |
Family
ID=7242562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEK112735D Expired DE539481C (en) | 1928-12-21 | 1928-12-21 | Process for hardening steel and cast iron alloys in a nitrogen-releasing atmosphere |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE539481C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE898451C (en) * | 1941-09-17 | 1953-11-30 | Siemens Ag | Method and device for the partial nitriding of elongated bodies |
| DE1226394B (en) * | 1959-09-15 | 1966-10-06 | To A Kako Kabushiki Kaisha | Rapid nitriding process |
-
1928
- 1928-12-21 DE DEK112735D patent/DE539481C/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE898451C (en) * | 1941-09-17 | 1953-11-30 | Siemens Ag | Method and device for the partial nitriding of elongated bodies |
| DE1226394B (en) * | 1959-09-15 | 1966-10-06 | To A Kako Kabushiki Kaisha | Rapid nitriding process |
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