| 摘要 |
PROBLEM TO BE SOLVED: To fix a structural element made of ferritic perlite cast material where high temperature gas passes with high reliability by making a profile clamp of martensite steel having a specified coefficient of thermal expansion lower than that of the ferritic cast material at a specified ambient temperature. SOLUTION: This profile clamp comprises a substantially semicircular fastening band 1, bolts 2-4, a flat washer 5, a substantially semicircular annular ring 6, and preferably plural reinforcement materials of a thin sheet metal strip 8 shape. The steel used in the fastening band 1 and the annular part 6 is martensite having a coefficient of thermal expansion lower than that of the ferritic cast material at least by 0.3×10<-6> m/m deg.C at the ambient temperature of 20 deg.C-750 deg.C. This profile clamp has lower expansion than structural elements joined to each other by the clamp at a temperature of 750 deg.C or less. Accordingly, at least 750 deg.C or below, these structural elements can be stopped surely and firmly.
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