It is well known that 13% Cr steel is one of the most economic stainless steels.
It is, however, inferior to austenitic stainless steels in creep rupture strength
above 600' C.
Therefore, an attempt has been made to imprive the creep rupture, strength of
13% Cr steel. This work is principally concerned with the investigation of the
influence of the cooling rate during centrifugal casting on the creep rupture
strength of 13% Cr steel.
The results obtained are summarized as follows:
- The creep strength of 13% Cr steel is improved by increasing
cooling rate during centrifugal casting.
- The higher cooling rate promotes: large sizes of columnar structures
and fine dispersion of precipitates. These are shown to have a
beneficial effect on the creep strength of 13% steel.