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Abstract - DWTT (Drop Weigh Tearing Test) is one critical method that can exhibit the fracture properties of line pipe steel, since it estimates the properties with real pipe steel. In this study, the ductile portion, inverse fracture ratio and absorbed energy of API X65 and X70 line pipe steels were estimated with temperature variation. Both steels showed that the ratio of ductile area and absorbed energy were decreased with respect to decreasing the test temperature. However, while the ductile fracture behavior exhibited until -40 ℃ for the X70 steel, but it showed until -30℃ for the X65 steel. The fracture properties were discussed with respect to test temperatures.Key words : linepipe steel, DWTT, absorbed energy † I.     ,            [1-8].      (  LNG  )    (line † :jsphb@hanbat.ac.krpipesteels)    . ,      ,     ,        [1,7,9].       .  ,     ,        ,           .KIGAS Vol. 16, No. 3, June, 2012(Journal of the Korean Institute of Gas)

Estimation of fracture toughness of X65 and X70 steels by DWTT