The grades
In mild environment, the performance of 304, 316
and 430 was the same. In aggressive environment
such as marine environment 430 corroded more than
304 and 316. Pits propagated slowly in mild
environment but in aggressive environment pits grew
fast. Degradation rate was high.
Surface finishes
MF gave the highest resistance. HL with machine
marks in the vertical direction performed better than
in the horizontal one.
During 39 months of study, 304 MF performed better
than 316 2B and 316 HL. The chemical composition
was important for corrosion resistance but surface
finishes also played an important role on the
resistance as well.