炭素鋼(STS42)の破壊靭性値と試験基準

This paper describes an apparent difference in the fracture toughnesses obtaind by using JSME S 001 and ASTM E 813 test standards, and its influence on a fracture load prediction of carbon steel pipes. Fracture tougnhness tests were conducted in air at room temperature on 1CT specimens prepared from a carbon steel pipe STS 42 (20 B, sch. 100) for LWR plants. Using these fracture toughnesses, analyses were carried out to evaluate the fracture loads of a carbon steel pipe with a circumferential through-wall crack. It is noted that the predicted fracture loads for the two pipes with same geometry are almost the same in spite of large difference in the fracture toughnesses.