Influence of Columbium on the 870°C Creep Properties of 18% Chromium Ferritic Stainless Steels 810035
Ferritic stainless steels are commonly used for the structural components in automotive bead-bed catalytic converters. A laboratory investigation was conducted to characterize the elevated temperature creep properties of various ferritic steels. Results show that a significant improvement in 870°C creep strength of 18% chromium steels is achieved with the combination of approximately 0.5% free columbium and a high final annealing temperature. Such steels are shown to have short term 870°C creep properties comparable to type 304 stainless steel. The superior creep strength of columbium-bearing steels appears related to a Laves phase precipitate which forms at elevated temperatures.
Citation: Johnson, J., "Influence of Columbium on the 870°C Creep Properties of 18% Chromium Ferritic Stainless Steels," SAE Technical Paper 810035, 1981, https://doi.org/10.4271/810035. Download Citation
Author(s):
John N. Johnson
Pages: 16
Event:
SAE International Congress and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 1981Transactions-V90-A
Related Topics:
Steel
Catalytic converters
Chromium
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