CHROMIUM-CONTAINING AUSTENITIC ALLOY

A Cr-containing austenitic alloy which has a continuous chromium oxide layer having a thickness of 5 to less than 50nm on at least one of the faces of the alloy. When the chromium oxide layer on a Cr-containing austenitic alloy is continuous, the alloy exhibits a maximum current density of 0.1µA/cm2...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	UEHIRA, AKIHIRO, HIDAKA, YASUYOSHI, MASAKI, YASUHIRO, KANZAKI, MANABU, MIYAHARA, OSAMU
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ALLOYS CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS NUCLEAR ENGINEERING NUCLEAR PHYSICS NUCLEAR POWER PLANT PHYSICS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	A Cr-containing austenitic alloy which has a continuous chromium oxide layer having a thickness of 5 to less than 50nm on at least one of the faces of the alloy. When the chromium oxide layer on a Cr-containing austenitic alloy is continuous, the alloy exhibits a maximum current density of 0.1µA/cm2 or lower as determined by a critical passivation current density method. It is preferable that the base metal has a chemical composition which contains, in mass%, up to 0.15% of C, up to 1.00% of Si, up to 2.0% of Mn, up to 0.030% of P, up to 0.030% of S, 10.0 to 40.0% of Cr, 8.0 to 80.0% of Ni, up to 0.5% of Ti, up to 0.6% of Cu, up to 0.5% of Al, and up to 0.20% of N, with the balance being Fe and impurities. L'invention concerne un alliage austénitique contenant du Cr qui a une couche continue d'oxyde de chrome ayant une épaisseur de 5 à moins de 50 nm sur au moins l'une des faces de l'alliage. Lorsque la couche d'oxyde de chrome sur un alliage austénitique contenant du Cr est continue, l'alliage présente une densité de courant maximale de 0,1 µA/cm2 ou moins telle que déterminée par un procédé de densité de courant de passivation critique. On préfère que le métal de base ait une composition chimique qui contient, en % en masse, jusqu'à 0,15 % de C, jusqu'à 1,00 % de Si, jusqu'à 2,0 % de Mn, jusqu'à 0,030 % de P, jusqu'à 0,030 % de S, 10,0 à 40,0 % de Cr, 8,0 à 80,0 % de Ni, jusqu'à 0,5 % de Ti, jusqu'à 0,6 % de Cu, jusqu'à 0,5 % d'Al et jusqu'à 0,20 % de N, le complément étant Fe et les impuretés.