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Pine Beach, NJ

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Stainless steel resistance to corrosion by chlorides

Q. I am designing a blending system to process a 36% NaCl solution at temperatures up to 80F. Could anyone give more information on the risk / tolerances of corrosion of stainless steel 316L by chlorides at that concentration and temperature?

Thanks,

Giuliano Hofling
Food Processing Equipment - Vernon Hills, Illinois, USA
2003

A. As you apparently already know, chlorides are one of the worst things you can put on stainless steel. 316L, if properly passivated is pretty resistant to NaCl at this temperature. Long term you probably could develop some problems. If you still have an option, you might want to consider a better alloy like 318 or 904, if suitable for your application.

Lee Kremer
Stellar Solutions, Inc.

McHenry, Illinois

2003

A. Type 316 stainless steel has only marginal resistance to pitting in seawater. The chloride concentration in your application is much to high for this grade. You will need to consider higher performance alloys, possibly nickel-based alloys. You can find a great deal of information on corrosion of stainless steels and nickel alloys at the Nickel Development Institute website.

Toby Padfield
Automotive module supplier - Michigan
2003

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