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303 Stainlees steel in sea water: best plating

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csinct

csinct

Mechanical
Oct 8, 2003
2
I'm currently using a 303 Stainless Steel pin on a mechanical sensor that is submerged in sea water. The 303 is a free cutting grade that has shown signs of significant rusting over time in the salt water (5-6 months). I can get this same pin off the shelf with several different finishes. Is their a reference on the internet for how well different finishes hold up in sea water? The choices are limited to Zinc, Cadmium, Zinc Chromate or Cadmium Chromate. Any help would be greatly appreciated.

Thanks in advance!
 
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None of those finishes will withstand sea water for long periods. Is it possible to change the pin to something more suitable for seawater service? What mech. properties does it need, and how much machining?
 
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I'm press fitting a 303ss center cut pin at 1/16" OD into a 316ss cam. This pin is a catalog item and I've tested it to a shear strength of 540lbs. I only require 150lbs. I can't find the same size pin in 316ss so I've been talking to few coating suppliers for some ideas but their data is based on a salt spray test, I'm looking for submergence information.
 
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You can get bare, 1/16" diameter SS weld rod in alloys 308, 310, 316L, etc. All better than 303 re corrosion.
 
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It seems many times people stay away from 304 and 316 because of machinability. There is a mill that has enhanced the machinability of stainless over and above what is available domestically. The mill is Ugine and the materials are from the Ugima product line. I have been able to single point machine the Ugima 304 at 950 SFPM, .007 ipr, .040 DOC, using coated ceramics. I could have gone faster but just ran out of machine speed.

You may want to try these alloys as the replacement for 303.

 
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