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RE: Stainless steel bolting

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The harder steels are less susceptible to galling.  You can select stainless steel bolts from the ASTM A193 family of steels.  They will still be a type 316.

There are some lubricants and anti galling compounds that will not wash off with water.  Check out Synergistic Coatings, Neverseez, or Loctite.  Synergistic Coatings, Neverseez, and Loctite are also anticorrodents.  Some are fluorcabons, some are metallic oxides with petroleum vehicles, and some are epoxies.  Get some samples, and product literature and see what strikes your fancy.

Other factors are the operating temperature, pretension load, and reuse (not advisable).  Take care in specifying installation guidelines.

Harold Sprague, PE
Krawinkler, Luth & Assoc.


-----Original Message-----
From:	Horning, Dick/CVO [SMTP:dhorning(--nospam--at)CH2M.com]
Sent:	Wednesday, August 05, 1998 4:15 PM
To:	'seaint(--nospam--at)seaint.org'
Subject:	Stainless steel bolting

Has anyone found a good solution to the problem with galling of the
threads for stainless steel fasteners?  This specific application is
under water, so a coating may not work.  Also, the water is high in
chloride and sulfate ions, so galvanic corrosion of dissimilar metals is
likely.  Our contractor has suggested making the bolts a 400-series
stainless and furnishing 316 stainless nuts as specified.

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