Effect of Carbon on the Hardenability and Mechanical Properties of 5ni-Cr-Mo-V Steel

摘要

Seven Laboratory 5Ni-Cr-Mo-V steels containing 0.05 to 0.27 percent carbon were evaluated to establish the carbon-ordering range for the 5Ni-Cr-Mo-V steel as an HY-130/150 steel and to determine the potential of the 5Ni-Cr-Mo-V steel as an HY-180/210 steel. The results showed that an average yield strength of about 140 ksi should be obtained in 1/2-inch-thick water-quenched production plates at a carbon content of about 0.045 percent, but that a minimum carbon content of about 0.085 percent should be specified to obtain similar properties at the midthickness of 4-inch-thick water-quenched plates. Therefore, an ordering range of 0.08 to 0.13 percent carbon is recommended for the 5Ni-Cr-Mo-V steel to insure the desired strength, toughness, and weldability for an HY-130/150 steel. In the tempering range 900 to 1200 F, none of the steels investigated exhibited a yield strength of 180 ksi. The high-carbon steels urom the present study and other experimental steels are being evaluated at lower tempering temperatures to determine their potential as HY-180/210 steels.