In succession to the studies previously reported in the Part I, investigations were carried out on the quality variation of high strength deformed reinforcing steel bars, the effect of depth of concrete layers placed in a lift while concrete was plastic upon the bond strength of concrete with deformed bars, and the relations between the size of cracks caused on the surface of deformed bars due to the cold work of bending and rebending.
　The quality investigation was performed on the samples of 56 kinds of deformed bars taken from the nineteen harbour construction works during the fiscal year 1966, which proved them to comply satisfactorily with the requirements of Japan Industrial Standard G 3112-1964, Steel Bars for Reinforced Concrerte. The quality variation of these bars was found in general small, for example, the coefficient of variation of either yield point or tensile strength was 2 to 3 percent and that of elongation was 3 to 4 percent.
　Bond strength of concrete with defomred bars buried horizontally with different depths in 15×15cm columns of 180cm high was found to decrease considerably only at the top layer of 0 to 60cm and to be nearly constant at the deeperlayers.
　The cracks of 0.1 to 0.5mm widths caused on the surface texture of deformed bars due to the cold work of bending and rebending of 90 degree did not affect the yield point and tensile strength but the elongation decreased considerably.