450 Stainless Steel and Salt Water

I have an application that is notorious for breaking bolts. It's a carbon steel guard fastened to a carbon steel housing. The current fastener are 316SS. I am weighing the option of using high strength fasteners. If they were metric the obvious choice would be A4-80 but that is not so easily found in SAE. I can get 450 stainless fasteners. Crevice corrosion should not be an issue. Any thoughts or experience with 450 SS in submerged saltwater applications?

I presume that you mean Custom 450 PH stainless.
And I presume that you can preclude crevice corrosion by sealing the threads.
It may rust but it shouldn't crack
I would favor the H1000 or H1050 condition over the H900 because they have so much higher ductility.
I have used similar bolts in oilwell applications.

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P.E. Metallurgy, consulting work welcomed

We don't experience crevice corrosion where stainless fasteners are in contact with carbon steel.

Looking for a yellow book solution if you know what I mean.


Everything I read mentions salt water exposure in air and that these fasteners have good performance in that application. I guess that immersed is a less demanding exposure.

looks good to me

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P.E. Metallurgy, consulting work welcomed