...Proceedings of the ASME 2022 Pressure Vessels & Piping Conference PVP2022 July 17-22, 2022, Las Vegas, Nevada, USA PVP2022-84817 EXPERIMENTAL BASIS FOR THE EXTENSION OF ELASTIC-PERFECTLY PLASTIC STRAIN LIMITS EVALUATION PROCEDURE OF ASME SECTION III, DIVISION 5 CODE CASE N-861 TO GRADE 91, ALLOY...

.... The material was added to ASME BPVC in 1983 (thru Code Case 1943) as Grade 91. Higher yield and tensile strength, in comparison to other low-Cr alloy steels (like Grade 22), allowed for fabrication of thinner component wall thickness. This in-turn reduced susceptibility to through-wall thermal stresses during...

... Abstract Grade 91 steel has high creep strength and has been used as the material of piping in 600°C USC power plants in China. The Grade 91 materials used in actual power plants are useful in estimating the changes of material properties caused by long-term aging and damage at low stress...

... 80 hours per year to 400 hours per year, the Allowance B increased creep life consumption is slightly less than the Allowance A life consumption for each of these materials. Keywords: ASME B31.1, creep, temperature variation, pressure variation, low carbon steel, Grade 11, Grade 22, Grade 91, TP304...

... in the creep regime. Factors that dominate these early service-related cracks are discussed in this paper. This paper provides a list of more than 20 historical examples of power piping Grade 91 material macrocracks (partial wall or through-wall) that were not present immediately after construction...

... Abstract Stress rupture factors and weld strength reduction factors for Grade 91 steel weldments in the codes and literatures have been reviewed. Stress rupture factors for weld metals proposed for Code Case N-47 in the mid 1980’s was defined as a ratio of average rupture strength...

... critical creep damage weldments for nondestructive examinations. high energy piping asset integrity management fitness-for-service Grade 11 Grade 22 Grade 91 ASSET INTEGRITY MANAGEMENT OF HIGH PRESSURE PIPING SYSTEMS SUBJECT TO CREEP Marvin J. Cohn, P.E. Intertek AIM 601 W. California Ave...

... The use of creep strength enhanced ferritic alloys such as Grade 91 in fossil power plants has become popular for high temperature piping applications. Since Grade 91 has higher stress allowables than Grade 22, a designer can specify thinner component wall thicknesses, resulting in lower through...