WEAR RESISTANT DOUBLE LAYERED STEEL PIPE FOR BOILER AND ITS PRODUCTION

PURPOSE:To provide wear resistant double layered steel pipe for boilers which is necessary for coal firing fluidized bed boilers and is constituted by forming its outside surface layer of a hard layer having excellent wear resistance to collision of unburned coal fine powder, coal burning ashes, etc...

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Bibliographische Detailangaben
1. Verfasser:	HIRAISHI NOBUSHIGE
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS BLASTING 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 HEATING INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIGHTING MECHANICAL ENGINEERING METALLURGY METHODS OF STEAM GENERATION STEAM BOILERS STEAM GENERATION SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS
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Beschreibung
Zusammenfassung:	PURPOSE:To provide wear resistant double layered steel pipe for boilers which is necessary for coal firing fluidized bed boilers and is constituted by forming its outside surface layer of a hard layer having excellent wear resistance to collision of unburned coal fine powder, coal burning ashes, etc. CONSTITUTION:The inside layer is a steel pipe for a boiler heat exchanger and the outside layer contains, by weight %, 0.1 to 1.2 C, 0.1 to 1.5 Si, 0.1 to 1.5 Mn, 6 to 20 Cr, 0.1 to 10 Mo 0.1 to 4 V 0.1 to 3 Nb and 0 1 to 3 Al and the balance Fe with inevitable impurities. The steel for precipitation hardening type nitriding contg. the impurities consisting of