Abstract
The strength evaluation of ductile and brittle fracture characteristics of high pressure steel tubes have to be comfirmed for the hydraulic pressure tests. The elastic-plastic fracture tough-ness;Jin tests were carried out with the small size arc-shape specimens from 2 kinds of steel tubes of different materials. The new tubes were made in several years before, and used tubes were made in 30 years before. (STBA 12, the chemical compositions are different from each other and used tubes might have the creep damage under 480°C, 2×105 hours in boiler super heater). And Jin characteristics were discussed on these rusults of elastic-plastic fracture toughness test.
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