DE2133284A1 - Heat treatment of steel and cast iron in a gas atmosphere - Google Patents
Heat treatment of steel and cast iron in a gas atmosphereInfo
- Publication number
- DE2133284A1 DE2133284A1 DE19712133284 DE2133284A DE2133284A1 DE 2133284 A1 DE2133284 A1 DE 2133284A1 DE 19712133284 DE19712133284 DE 19712133284 DE 2133284 A DE2133284 A DE 2133284A DE 2133284 A1 DE2133284 A1 DE 2133284A1
- Authority
- DE
- Germany
- Prior art keywords
- steel
- cast iron
- gas atmosphere
- heat treatment
- ammonia
- 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.)
- Granted
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
Description
3 Hannover. Abb-». * Dr.j/K.3 Hanover. Fig- ». * Dr.j / K.
Meine Akte: 2023My file: 2023
IABRICA DE UTILAJE SI PIESE DE SCHIMB METAIOTEHNICA Str. Gh. Doja nr. 155, Tirgu-Mures - RumänienIABRICA DE UTILAJE SI PIESE DE SCHIMB METAIOTEHNICA Str. Gh. Doja nr. 155, Tirgu-Mures - Romania
Wärmebehandlung von Stahl und Gusseisen in GasatmosphäreHeat treatment of steel and cast iron in gas atmosphere
Die vorliegende Erfindung bezieht sich auf ein Verfahren zur Weichnitrierung (Karbonitrierung bei tiefen Temperaturen) von Stahl und Gusseisen in Schutzgas.The present invention relates to a method for soft nitriding (carbon nitriding at low temperatures) of steel and cast iron in protective gas.
Die Weiohnitrierung von Werkteilen aus Stahl und Gusseisen wird in herkömmlichen Verfahren in Salzbädern mit alkalischem Cyanat und Cyanid durchgeführt. Die Arbeitstemperatur dieser Salzbäder beträgt 570+10° C (d. h. un-ter der Phasenumwandlungstemperatur des ?e-N Systems). DurchWhite nitriding of parts made of steel and cast iron is carried out in conventional processes in salt baths with alkaline cyanate and cyanide. The working temperature of these salt baths is 570 + 10 ° C (i.e. below the phase transition temperature of the? e-N system). By
- 2 209809/1049 - 2 209809/1049
diese Wärmebehandlung wird eine Oberflächenschicht erzielt, welche aus zwei Zonen zusammengesetzt ist: einer Verbindungszone und einer Diffusionszone. Die erhöhte Festigkeit bei Gleitverschleiss ist durch die Verbindungszone (Weisseschicht) gewährleistet, wobei die Diffusionszone eine Trägerschicht darstellt.this heat treatment creates a surface layer which is composed of two zones: a connection zone and a diffusion zone. The increased strength with sliding wear is due to the Connection zone (white layer) ensured, whereby the diffusion zone represents a carrier layer.
Diese Verfahren weisen gewisse Nachteile auf, da eine kontinuierliche Kontrolle des Verfahrens nicht möglich ist - die einzige Kontrollmöglichkeit ist durch chemi-™ sehe Analysen gewährleistet.These processes have certain disadvantages, since continuous control of the process is not possible is - the only control option is guaranteed by chemical ™ analyzes.
Es ist auch ein Verfahren zum Nitrieren und Karbonitrieren in Gasatmosphäre von Endo-gas und Ammoniak bekannt. Dieses Verfahren hingegen ist an einen kostspieligen Gasgenerator gebunden.A method for nitriding and carbonitriding in a gas atmosphere of endo-gas and ammonia is also known. This method, however, is tied to an expensive gas generator.
Die Erfindung beseitigt die oben genannten Nachteile duroh Erzielen einer gleichförmigen und kontrollierbaren Wärmebehandlung zum Nitrieren bei einer Temperatur von 570+10° 0 in einer Gas atmosphäre von Ammoniak, Methan und Sauerstoff, in welcher folgende Verhältnisse bestehen: CH./NH5=I und (CH.+NH5)/O2=25-3O. Der Dissoziationsgrad des Ammoniaks liegt zwischen 38-40 $> und die Behandlungsdauer zwischen 1 und 10 Stunden.The invention eliminates the above-mentioned disadvantages by achieving a uniform and controllable heat treatment for nitriding at a temperature of 570 + 10 ° 0 in a gas atmosphere of ammonia, methane and oxygen, in which the following ratios exist: CH./NH 5 = I and (CH. + NH 5 ) / O 2 = 25-3O. The degree of dissociation of the ammonia is between 38-40 $> and the duration of the treatment is between 1 and 10 hours.
Im folgenden ist ein Ausführungsbeispiel der Erfindung zum Weichnitrieren von Werkstücken aus Stahl OLC 35 (Werkstoffnummer: 1.0501) beschrieben:The following is an embodiment of the invention for soft nitriding of workpieces made of steel OLC 35 (material number: 1.0501):
- 3 209809/1049 - 3 209809/1049
Die Wärmebehandlung wird in einer Atmosphäre mit folgender Zusammensetzung durchgeführt: NH,/GH.=1 mit einem Säuerstoffzusatz im Verhältnis NH5+CEL/O2=25-30. Die Arbeitstemperatur beträgt 57O+_1O° G. Die Ammoniakmenge wird für einen. Dissoziationsgrad von 35-40 $ geregelt. Nach einer 3stündigen Behandlung werden folgende Resultate erzielt:The heat treatment is carried out in an atmosphere with the following composition: NH, / GH. = 1 with an addition of oxygen in the ratio NH 5 + CEL / O 2 = 25-30. The working temperature is 57O + _1O ° G. The amount of ammonia is for one. Degree of dissociation regulated from $ 35-40. After 3 hours of treatment, the following results are achieved:
probe Härte p robe hardness
^rope HB HV1 HY3 HV5 HV10 HV3CT^ rope HB HV1 HY3 HV5 HV10 HV3CT
Unbehandelt 200-207 Badnitriert GasnitriertUntreated 200-207 Bath nitrided Gas nitrided
Eine metallographische Analyse ergab folgende Ergebnisse:A metallographic analysis showed the following results:
- Stärke der weissen Schicht: 10-15 /*n- Thickness of the white layer: 10-15 / * n
- Mikrohärte der weissen Schicht: 870-920 MHV- Micro hardness of the white layer: 870-920 MHV
- Tiefe der Diffusionszone: 0,35-0,5 mm.- Depth of the diffusion zone: 0.35-0.5 mm.
Durch Experimentieren wurden folgende Schlussfolgerungen bezüglich der Parameter für optimale Resultate gezogen:Through experimentation, the following conclusions were drawn regarding the parameters for optimal results:
a) Temperatur: 570+10° Ca) Temperature: 570 + 10 ° C
b) Zusammensetzung der Gasteile: NH,/CH,=1 und NH5+GH4/02=25-30b) composition of the gas components: NH, / CH, NH = 1 and GH 5 + 4/0 2 = 25-30
c) Dissoziationsgrad des Ammoniaks: 38-40 $> c) Degree of dissociation of ammonia: 38-40 $>
d) Die Dauer der Behandlung liegt zwischen 60 Minuten und 10 Stunden in Abhängigkeit der behandelten Werkteile.d) The duration of the treatment is between 60 minutes and 10 hours depending on the treated Movement parts.
- 4 209809/1049 - 4 209809/1049
Die Vorteile des neuen Verfahrens sind folgende:The advantages of the new process are as follows:
- metallisch-reine Oberflächen- pure metallic surfaces
- Möglichkeit einer kontinuierlichen und genauen Kontrolle der technologischen Parameter der Verfahren.- Possibility of continuous and precise control of the technological parameters of the Procedure.
209809/1049209809/1049
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RO6386470 | 1970-07-09 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE2133284A1 true DE2133284A1 (en) | 1972-02-24 |
| DE2133284B2 DE2133284B2 (en) | 1975-04-24 |
| DE2133284C3 DE2133284C3 (en) | 1975-11-27 |
Family
ID=20087940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2133284A Expired DE2133284C3 (en) | 1970-07-09 | 1971-07-05 | Process for soft nitriding steel and cast iron |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3705058A (en) |
| DE (1) | DE2133284C3 (en) |
| FR (1) | FR2098281B1 (en) |
| GB (1) | GB1351162A (en) |
| HU (1) | HU163105B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1471880A (en) * | 1973-10-26 | 1977-04-27 | Air Prod & Chem | Furnace atmosphere for the heat treatment of ferrous metal |
| US4035203A (en) * | 1973-12-21 | 1977-07-12 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Method for the heat-treatment of steel and for the control of said treatment |
| US4108693A (en) * | 1974-12-19 | 1978-08-22 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Method for the heat-treatment of steel and for the control of said treatment |
| US4049473A (en) * | 1976-03-11 | 1977-09-20 | Airco, Inc. | Methods for carburizing steel parts |
| US4366008A (en) * | 1979-02-09 | 1982-12-28 | Kabushiki Kaisha Fujikoshi | Method for hardening steel |
| JP4500708B2 (en) * | 2005-02-25 | 2010-07-14 | 住友金属工業株式会社 | Non-tempered steel nitrocarburized parts |
| WO2015136917A1 (en) * | 2014-03-13 | 2015-09-17 | 新日鐵住金株式会社 | Nitriding method, and nitrided component manufacturing method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB395337A (en) * | 1930-11-01 | 1933-07-13 | Krupp Ag | Improvements in processes for hardening iron, steel, and cast iron, alloys by nitrogenising |
-
1971
- 1971-07-05 DE DE2133284A patent/DE2133284C3/en not_active Expired
- 1971-07-07 US US160523A patent/US3705058A/en not_active Expired - Lifetime
- 1971-07-08 FR FR7125038A patent/FR2098281B1/fr not_active Expired
- 1971-07-09 GB GB3242871A patent/GB1351162A/en not_active Expired
- 1971-07-09 HU HUFA893A patent/HU163105B/hu unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE2133284B2 (en) | 1975-04-24 |
| DE2133284C3 (en) | 1975-11-27 |
| HU163105B (en) | 1973-06-28 |
| FR2098281B1 (en) | 1975-10-10 |
| US3705058A (en) | 1972-12-05 |
| GB1351162A (en) | 1974-04-24 |
| FR2098281A1 (en) | 1972-03-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C3 | Grant after two publication steps (3rd publication) | ||
| E77 | Valid patent as to the heymanns-index 1977 | ||
| 8339 | Ceased/non-payment of the annual fee |