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1. WO1991000929 - PROCESS FOR CASE-HARDENING ROLLER BEARING COMPONENTS OF LOW-ALLOY NICKEL STEEL

Publication Number WO/1991/000929
Publication Date 24.01.1991
International Application No. PCT/EP1989/000787
International Filing Date 07.07.1989
Chapter 2 Demand Filed 21.05.1990
IPC
C21D 1/78 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
78Combined heat-treatments not provided for above
C21D 3/06 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
3Diffusion processes for extraction of non-metals; Furnaces therefor
02Extraction of non-metals
06Extraction of hydrogen
C21D 9/40 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
40for rings; for bearing races
C23C 8/80 2006.01
CCHEMISTRY; METALLURGY
23COATING 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
CCOATING 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
8Solid 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
80After-treatment
CPC
C21D 1/78
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
78Combined heat-treatments not provided for above
C21D 3/06
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
3Diffusion processes for extraction of non-metals; Furnaces therefor
02Extraction of non-metals
06Extraction of hydrogen
C21D 9/40
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
40for rings; for bearing races
C23C 8/80
CCHEMISTRY; METALLURGY
23COATING 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
CCOATING 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
8Solid state diffusion of only non-metal elements into metallic material surfaces
80After-treatment
F16C 33/64
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
33Parts of bearings; Special methods for making bearings or parts thereof
30Parts of ball or roller bearings
58Raceways; Race rings
64Special methods of manufacture
Applicants
  • AGA AB [SE/SE]; S-181 81 Lidingö, SE
Inventors
Agents
  • DELFS, Klaus ; Glawe, Delfs, Moll und Partner Liebherrstrasse 20 D-80538 München, DE
Priority Data
Publication Language German (DE)
Filing Language German (DE)
Designated States
Title
(DE) VERFAHREN ZUM EINSATZHÄRTEN VON WÄLZLAGERELEMENTEN AUS NIEDRIGLEGIERTEM, NICKELHALTIGEM STAHL
(EN) PROCESS FOR CASE-HARDENING ROLLER BEARING COMPONENTS OF LOW-ALLOY NICKEL STEEL
(FR) PROCEDE DE CEMENTATION D'ELEMENTS DE PALIERS A ROULEMENT EN ACIER AU NICKEL FAIBLEMENT ALLIE
Abstract
(DE)
Bei einem Verfahren zum Einsatzhärten von Wälzlagerelementen aus niedriglegiertem, nickelhaltigem Stahl werden die Wälzlagerelemente in einem dissoziierenden Aufkohlungsgas aufgekohlt, abgekühlt, auf Härtetemperatur erwärmt, in der Aufkohlungsschicht austenitisiert und schließlich abgeschreckt. Damit beim Aufkohlen keine Versprödung der Wälzlagerelemente durch dissoziierten Wasserstoff des Aufkohlungsgases erfolgt, werden die Wälzlagerelemente von der Aufkohlungshitze bis auf etwa 300°C in bewegtem Inertgas abgekühlt und anschließend bei dieser Temperatur gehalten, so daß genügend dissoziierter Wasserstoff aus der Aufkohlungsschicht der Wälzlagerelemente entweicht. Das anschließende Erwärmen der Wälzlagerelemente auf Härtetemperatur oder auf Zwischenglühtemperatur erfolgt vorteilhafterweise unmittelbar nach dem Halten auf 300°C.
(EN)
In a process for case-hardening roller bearing components of low-alloy nickel steel, the roller bearing components are carburised under a dissociating gas, cooled, heated to hardening temperature, austenitised in the carburising layer and finally quenched. To prevent the embrittlement of the roller bearing components through dissociated hydrogen from the carburising gas, they are cooled from the carburising temperature to about 300°C under a moving inert gas and then maitained at this temperature so that adequately dissociated hydrogen is released from the carburised layer of the components. The subsequent heating of the roller bearing components to hardening temperature or intermediate annealing temperature is preferably performed directly after their maintenance at 300°C.
(FR)
Dans un procédé de cémentation d'éléments de paliers à roulement en acier au nickel faiblement allié, lesdits éléments sont cémentés dans un gaz de cémentation dissocié, refroidis, réchauffés à la température de trempe, austénitisés dans la couche de cémentation et, finalement, trempés. Afin qu'il ne se produise, lors de la cémentation, aucune fragilisation des éléments de paliers à roulement, par l'hydrogène dissocié du gaz de cémentation, lesdits éléments de paliers à roulement sont refroidis, à partir de la température de cémentation jusqu'à environ 300°C, dans un gaz inerte en mouvement, puis maintenus à cette température, de façon que suffisamment d'hydrogène dissocié s'échappe de la couche de cémentation desdits éléments. Le réchauffage subséquent de ces éléments, pour les porter à la température de trempe ou à une température de recuit intermédiaire, s'effectue avantageusement immédiatement après maintien à 300°C.
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