1961 Volume 47 Issue 4 Pages 599-603
Experimental studies were made on the effect of C, Cr, Mo and V on hardness on heat treatments, mechanical properties at elevated temperature, rupture strength, microstructures and deformation ratios of 3% Cr heat-resisting steel, which is used for heat-resisting parts of aeroplane structures.
Results obtained were as follows:
(1) With increase of C contents, the hardness on heat treatment and the tensile strength at elevated temperatures were increased. But the rupture strength showed the maximum value at about 0.36% C.
(2) By further addition of Cr contents, the as quenched-and-tempered hardness below 600°C were increased. The as-tempered hardness, the tensile strength and the rupture strength in a range of high temperature above 650°C were decreased.
(3) By increase of Mo, the hardness after heat treatment was increased, but the tensile strength at elevated temperature and the rupture strength showed maximum value at about Mo content.
(4) Addition of V increased the hardness of steel on heat treatment, but the tensile strength at elevated temperatures and the rupture strength became maximum at about0.55%V content.