PROTECTIVE FILM OF COOLER IN CONVERTER OFF-GAS TREATMENT FACILITY AND METHOD OF FORMING THE SAME

PROBLEM TO BE SOLVED: To provide a film-forming method whereby a protective film having no pore is formed on a cooler wall near an off-gas passage, wherein a cooler composes the off-gas passage of a converter off-gas treatment facility, so that chlorine ions or corrosive gas such as hydrogen sulfide...

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Bibliographische Detailangaben
Hauptverfasser:	KANBAYASHI TSUTOMU, SAKURA HIROBUMI
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS BLASTING CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY 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 DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE DIFFUSION TREATMENT OF METALLIC MATERIAL FERROUS OR NON-FERROUS ALLOYS FURNACES HEATING INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL KILNS LIGHTING MECHANICAL ENGINEERING METALLURGY METALLURGY OF IRON OVENS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL RETORTS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION THEIR RELEVANT APPARATUS TRANSPORTING TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a film-forming method whereby a protective film having no pore is formed on a cooler wall near an off-gas passage, wherein a cooler composes the off-gas passage of a converter off-gas treatment facility, so that chlorine ions or corrosive gas such as hydrogen sulfide contained in the off-gas cannot enter the protective film. SOLUTION: When forming the protective film on the cooler wall near the off-gas passage, wherein the cooler composes the off-gas passage which cools and safely leads the converter off-gas to a dust collector, rust on the cooler wall is removed and the wall is subjected to blast treatment. Then, self-fluxing alloy powder of Ni, Co, etc. is sprayed onto the cooler wall with a high-pressure/ultra-high-speed spraying gun at a spray rate of 780-1,200 m/s to form a film with a thickness of 0.1-1 mm. Then, the film is melted at about 1,040°C and welded onto the cooler wall. COPYRIGHT: (C)2005,JPO&NCIPI