1956 Volume 25 Issue 12 Pages 696-702
Generally when steel sheets are hot rolled, it is a well established fact that if the temperature of the finish rolled sheets becomes lower at a certain range without having any effect of cold working, then better notch toughness is obtainable.
The authors have succeeded in obtaining sheets of 22mm thick which we manifested high notch toughness just by regulating finish roll temperature.
Summaries were obtained as follows ;
(1) All steels (A, B, C, D and E) comply with German HSB50 steel standard in the mechanical and DVM impact value at 0°C
(2) Especially Steel "C" (finished at 740°C), "D" (700°C), and "E" (650°C) show the satisfactory result in the notch toughness after strain aged and comply with HSB 50A steel standard.