Slow notch bend tests with semi-killed, killed and HT 52 high tensile steels were performed. Fracture appearance transition temperatures Tii and energy transition temperatures are nearly the same, and transition temperatures in ductility criterion Ti, those in low energy level TrLE (10 kg-m/cm²) and those in reduction in thickness Trφ (4 %) and also nearly the same for three kinds of steels. Results of slow bend tests are compared with the results of Charpy and Tipper tests in same steels. As to fracture appearance transition temperature, slow bend test is most sensitive and Tipper test is the next.