  Tube processing and aging effects in FeCrAl ODS steels are investigated in
four mechanical alloyed ferritic ODS steels, Fe15Cr (SP2), Fe15Cr5Al (SP4),
Fe15Cr7Al (SP7) and Fe18Cr7Al (SP11). These steels were made into 0.3mm thick
plates by simulated tube processing (STP). Strengthening after partial
recrystallization was achieved after the last cold rolling and heat treatment
step. However, the ductility reduced about one third of the as-extruded steels.
The STPed steels were aged at 475{\deg}C in sealed vacuum tubes up to 2000 hrs
and 10000 hrs, respectively. The yield stress and elongation were investigated
by tensile tests. The results revealed that all the STPed steels fractured in a
ductile manner irrespective of aging conditions. Aging hardening and ductility
reduction in STPed steels are similar to as-extruded ones. The STPed ODS steels
showed similar ageing embrittlement resistance as as-extruded steels, but much
higher than the non-ODS steels. The aging hardening based on cut-through and
bow-pass mechanisms were discussed. The time dependent hardening of overaged
steel (beta prime only) was analyzed as well.
