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A Summary of 10 Years Research on Grade 91 and Grade 92 Steel
Advances in Materials Technology for Power Plants, 2019Abstract In response to the strong needs for the life assessment of various components in fossil power plants, studies on Grade 91 and Grade 92 steels have been jointly performed by EPRI and CRIEPI for a last decade. These studies have been covering the effects of load variation (creep- fatigue) and stress multiaxiality as well as the ...
Yukio Takahashi +3 more
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Creep rupture behavior of Grade 91 steel
Materials Science and Engineering: A, 2013Abstract Grade 91 steel is considered a potential structural material for advanced nuclear reactors. The creep deformation behavior of Grade 91 steel was studied in the temperature range of 600–700 °C and at stresses of 35–350 MPa. The data were analyzed in terms of Monkman-Grant relation and Larson–Miller parameter. Creep damage tolerance factor and
Triratna Shrestha +4 more
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Power Piping Grade 91 In-Service Cracks
Volume 6A: Materials and Fabrication, 2019Abstract After a power piping system has begun commercial operation, it is recommended that the initial nondestructive examination (NDE) of the welds should be developed and executed to reveal possible fabrication and early service-related material damage.
Marvin J. Cohn +5 more
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Assessment of the Tempering Behavior of Grade 91 Steel
Materials Performance and Characterization, 2013Abstract At any point in the fabrication and installation of Grade 91 components, undesirable metallurgical conditions can develop as a result of incorrect heat treatment. Industry techniques for locating and evaluating these microstructures using nondestructive methods are necessary.
Jonathan Parker +2 more
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Characterisation of the Microstructure Evolution of Aged Grade 91 Steel
Volume 6: Materials and Fabrication, 2020Abstract 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 conditions.
Chang Che +4 more
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Performance of Grade 91 Steels in Boiler Applications
CORROSION 2005, 2005Abstract Advanced steels are finding increased use in high-energy applications. These steels are metallurgically more complex than the traditional chromium-molybdenum based alloys and this complexity introduces challenges to fabricators and operators. Key issues associated with using Grade 91 steel (9% Chromium creep resistant steel) are
W. Weiss, J. Parker
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Fitness for Service of Degraded Grade 91 Pipe
Volume 6: Materials and Fabrication, Parts A and B, 2012The 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-wall thermal stresses during transient events and lower ...
Marvin J. Cohn, Steve R. Paterson
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Creep Rupture Properties of Grade 91 Weldments
Advances in Materials Technology for Power Plants, 2004Abstract The use of creep strength-enhanced ferritic alloys like Grade 91 has become popular in fossil power plants for applications at temperatures above 566°C (1050°F). Compared to Grades 11 and 22, Grade 91 offers higher stress allowables, better ramp rate tolerance, weight reduction, and lower thermal expansion coefficients at ...
Marvin J. Cohn +2 more
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Dissimilar Metal Welds in Grade 91 Steel
Advances in Materials Technology for Power Plants, 2016Abstract Unpredictable failures near the phase boundary in Grade 91 dissimilar metal welds (DMW) with nickel based filler metals represent a significant problem for the power generation industry. In order to determine the root cause for these failures, it is necessary to understand the formation of the microstructure in the weld regions ...
Michael W. Kuper +3 more
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Evaluation of Stress Rupture Factors for Grade 91 Weldments
Volume 6B: Materials and Fabrication, 2018Stress rupture factors and weld strength reduction factors for Grade 91 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 the average rupture strength of the deposited filler metal to the average rupture strength of the base metal.
Masatsugu Yaguchi, Kazuhiro Kimura
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