| Abstract Scope |
The recently completed A-USC ComTest program, funded by the US Department of Energy, Office of Fossil Energy, demonstrated the domestic capability to make full-scale pipes, bends and forged fittings for A-USC coal-fired power plants. The program concluded with limited mechanical property and dimensional acceptance testing that showed that the test articles met ASME B&PV Code case 2702 and applicable ASTM specifications. Since the conclusion of the program an instrumented bend test was conducted on a 28-inch OD by 2-inch wall pipe. Supplementary mechanical property tests including stress-rupture and fatigue have been conducted. In thick section alloy 740H auto-ages during cooling from solution treatment to near full aged hardness. A coarser grain and gamma prime size resulted in lower yield and fatigue strength but higher long time stress rupture strength. This paper presents the most recent findings and discusses the readiness of the alloy for A-USC construction. |