Stainless fasteners in carbon steel - wet environment 1

[CrazyJ]

I've installed equipment where the supplier gave 8.8 bolting for carbon steel to carbon steel. The application is wet. Now I know enough to say that A2-70 and A2-80 are not quite up to the yield strength of an 8.8 fastener. However, I'd like to change out the fasteners to stainless steel, but is there any benefit here? If we paint them, is there any benefit to installing a stainless fastener in this application?

I would worry enough about the yield strength in this application to say the new fastener would need at least equivalent, or very close.

I see that B6 threaded rod is roughly equivalent, but why is there so little information on B6, where B7 and B8 seem to get 'all the press'. Is there some application where all they use is B7 or B8?

 

[desertfox]

Hi crazyJ

I'd be concerned about galvanic corrosion between stainless and carbon steel.

desertfox

 

[desertfox]

Hi Again

Have a look at this link. its all about stainless fasteners and depending on your grade there's not many have the yield stress of an 8.8

http://www.ssina.com/view_a_file/fasteners.pdf

desertfox

 

[TVP]

Bulten Stainless offers stainless steel fasteners in 8.8 and 10.9 property classes. The first several links from this Google search provide more information:

http://www.google.com/search?q=Bumax+8.8+filetype:pdf&hl=en&num=10&lr=&ft=i&cr=&safe=images&tbs=

 

[EdStainless]

You may be better off just using coated CS bolts. There are many sources for good coated bolts.

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