Abstract Scope |
In the construction of a power plant or process unit, it is common to use Chromium-Molybdenum steels for high temperature and oxidation resistance. Different grades of Chromium-Molybdenum steel are used for different service conditions within the unit. When these different grades of Chromium-Molybdenum steels are joined together, consideration has to be given to the differences in post weld heat treatment temperature requirements and the resulting effect on the properties of the weldment, as well as the possibility of carbon migration due to the differences in Chromium content. The design also includes different grades of austenitic steels, which will also require connection to the Chromium-Molybdenum steels, which introduces another set of considerations.
This presentation will explore the filler metal selection criteria for dissimilar metal welds in Chromium-Molybdenum steels and the means to mitigate the common problems associated with them. |