EVALUATION OF 3NI-CR-MO STEELS.
Abstract
The extent to which nickel, vanadium, columbium, and/or tantalum would improve the hardenability, temperability, and mechanical properties of four 0.25 percent carbon and four 0.15 percent carbon 3Ni-Cr-Mo steels was investigated. The results indicated that the 0.25 percent carbon steels had just sufficient hardenability for 4-inch-thick water-quenched plates, but that the 0.15 percent carbon steels did not have sufficient hardenability. The addition of vanadiu, columbiu, and/or tantalum increased the resistance of the 0.25 and the 0.15 percent carbon steels to softening during tempering. However, these additions generally reduced the Charpy V-notch energy absorption of the 0.25 percent carbon steels but did not reduce the energy absorption of the 0.15 percent carbon steels that were cooled rapidly enough so that they fully hardened. Among the steels investigated, an 0.25 percent carbon, low-manganese (0.13%), low-silicon (0.05%) 3Ni-1.5Cr-0.9Mo steel exhibited the best combination of strength and toughness over the yieldstrength range 120 to 210 ksi, and appears promising as an HY-130/150 or an HY-180/210 steel. However, this steel has distinctly poorer tempering characteristics and weldability than the 5Ni-Cr-Mo-V steel that has been extensively evaluated as an HY-130/150 steel. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1964
- Accession Number
- AD0600934
Entities
People
- Lew F. Porter
- S. J. Manganello
Organizations
- U.S. Steel