|
It has been claimed that during the
welding of 316L alloys, manganese evaporates
from the weld pool and redeposits
in the heat-affected zone, primarily
downstream of the weld pool, causing
corrosion. A study was performed on four
alloys to determine the corrosion behavior
of ultralow-manganese and low-manganese
316L alloys in different gaseous
environments. In addition, a weld fume
analysis was performed to determine
which elements evaporate to a significant
extent during orbital welding, and
whether it is the evaporation of manganese
that is responsible for any differences
in corrosion behavior. Results
showed that all four alloys demonstrated
very similar corrosion behavior, and they
released predominantly iron in approximately
the same amount. Thus, it is
believed that the evaporation and redeposition
of iron, not manganese, negatively
impacts the corrosion resistance of welded
low-manganese and ultralow-manganese
stainless steel alloys in chlorine
containing, moist, gaseous atmospheres. During the past 10 years, a number of
publications (referenced elsewhere [1])
have suggested that 316L stainless steel
alloys with extremely low concentrations
of manganese (referred to as ultralowmanganese
alloys, which contain less
than 0.05% Mn) are superior in corrosion
resistance as compared to more conventional
316L alloys, i.e., low-manganese
alloys (which contain less than 0.5% Mn)
and standard 316L alloys (which contain
less than 2.0% Mn).
Please login below to access the full text of this paper. If you are not currently an online member or subscriber sign-up today, it's free. For online membership, click here.
Not a member? Sign
up today, it's free.
|
