A Practical Perspective On Grade 91 & Grade 92 Creep Strength Enhanced Ferritic Alloys For Power Generation Applications

Creep strength-enhanced ferritic (CSEF) alloys such as Grade 91 and, to a lesser extent, Grade 92 have been widely used since the mid-1980s in North America for applications in the power generation and petrochemical industry, mainly due to their outstanding creep strength. Since then, numerous service failures associated with these materials have led to a flurry of research to identify and mitigate the causes. 

The paper focuses on a practical approach to ensure safe and reliable pressure systems by taking a hard look at the existing requirements, or lack there-of, in the ASME Code and engineering design, and the best practices to be implemented, maintained, and controlled during material procurement, fabrication, and installation.