The study of the load・change of a Ni・Cr steel(SNC2)under the impact bending load was carried out in the transition temperature range from ductile to brittle fracture、 At the test, standard Charpy impact testing machine was used and the load acting on the specimen was measured by the use of strain gauge and a cathode・ray osillograph. The results in this investigation were summarized as follows: (1)The load・time curves in the range from ductile to brittle fracture were classified into eight

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... (2) By the load−time curves the quan titative analysis of energies for the crack initiation and propagation have been made. (3) It was found that the energy obtained by the load・time curves apProximately coincides with the one by standard Charpy impact test.