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Letter 4055
Passivation of 420 Stainless
Steel
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Can nitric-acid passivation process make 420 Stainless steel as
corrosion resistant as 316? Please comment. Many thanks.
Kwok-wai CHOOK
- Hong Kong, China
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Yes, and it can make silk purses out of sow's ears.
-- The Society for the
Preservation of Barnyard Metaphors
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No, Mr. Chook, it won't work. 316 is a very high grade of
chemically resistant stainless steel. Passivation of 420 will help
deter flash rusting, but it won't turn 420 into 316.

Ted Mooney, P.E. - finishing.com - Brick, NJ
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I was a surgical instrument repair/maker for over 20 years.The
industry used 410 and 420 series for cutting tools due it's ability
to hold an edge, and 316 series to make rods and screws for putting
people back together. Just pull out a chart showing the difference in
composition of both and the reason is quite apparent.
Best wishes,
al mullins
- Fayetteville, Georgia
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