BOILER HEAT TRANSFER PIPE AND BOILER

PROBLEM TO BE SOLVED: To provide a boiler heat transfer pipe and a boiler for preventing fracture of a heat transfer pipe. SOLUTION: This boiler includes the boiler heat transfer pipe 10 in which fluid flows and which is composed of steel including at least Cr, and a surface-treated layer formed by...

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Hauptverfasser:	TOYOMARU MAKOTO, SHIRANE TAKAHIRO, KOMAI NOBUYOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OFGENERAL APPLICATION DIFFUSION TREATMENT OF METALLIC MATERIAL HEAT EXCHANGE IN GENERAL HEATING INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIGHTING MECHANICAL ENGINEERING METALLURGY METHODS OF STEAM GENERATION MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE STEAM BOILERS STEAM GENERATION WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a boiler heat transfer pipe and a boiler for preventing fracture of a heat transfer pipe. SOLUTION: This boiler includes the boiler heat transfer pipe 10 in which fluid flows and which is composed of steel including at least Cr, and a surface-treated layer formed by performing cold-working on an inner surface of the boiler heat transfer pipe 10, and degrees of treatment on the surface-treated layer at each of sections 11A, 11B, 11C, 11D, 12A, 12B, 12C, 12D of the inner surface are different from each other. COPYRIGHT: (C)2010,JPO&INPIT