CONVEYING ROLL AND HEARTH ROLL FOR CONTINUOUS ANNEALING FURNACE

• Main Author: KURISU YASUSHI
• Format: Patent
• Language: English
• Published: 21.04.2005
• Edition: 7
• Subjects: 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; 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; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

PROBLEM TO BE SOLVED: To provide a conveying roll and a hearth roll for a continuous annealing furnace which have a thermal-spray film applied on their surfaces in order to simultaneously solve such problems as slippage, meandering, dust-sticking and build-up of a steel sheet. SOLUTION: This conveying roll has the thermal-spray film having a ratio R/R' of ≥4 on the surface, wherein R represents a roughness parameter measured by setting a cut-off value to an initial value according to JIS B 0633, and R' represents a roughness parameter measured by setting the cut-off value to 1/10 of the initial value. The roughness parameter R is one of Ra, Rq, Rp, Rv, and Rz. The hearth roll has the roughness parameter Ra measured by setting the cut-off value to 2.5 mm of ≥2 μm. The thermal-spray film desirably consists of ceramics, cermet or heat-resistant alloy having 20 to 300 μm thickness. COPYRIGHT: (C)2005,JPO&NCIPI