The 10Ni-Cr-Mo-Co Steel Weldment -- Its Fabricability and Structural Suitability for Ultraservice Applications

摘要

Research was conducted to define effects of residual elements on properties of high-yield-strength steels, to study and develop optimum strengthening mechanisms, and to implement extensive base-metal and filler-metal alloy-development programs. As a result of this work, a 10Ni-Cr-Mo-Co steel weldment system has recently been developed that exhibits, at a minimum-yield-strength level of 180 ksi, the excellent toughness, weldability, and stress-corrosion resistance needed for critical hydrospace applications. This report describes the development of the 10Ni-Cr-Mo-Co steel weldment system, with particular emphasis on results of studies of fabrication variables and on evaluation of structural suitability of weldments fabricated by joining heavy-gage plates from production-scale heats. The results of fabricability studies include descriptions of effects of cold and hot forming, heat treating, and welding. The mechanical properties of weldments fabricated by using conventional gas-tungsten-arc (GTA), hot-wire GTA, and electron-beam welding processes are described.