Most of the client's specs I've seen specify Hot Dip Galvanized bolts to ASTM A153. for both carbon and stainless steel.
Unless there is a restriction from a process fluid point of view (i.e. corrosive for galvanized coatings). In that case you may have to investigate other type of bolt materials (A193 B8 - Austenitic Stainless Steel) or other types of coatings.
Regards,
Gabriel
From: Pisat, R. R(ahul) [mailto:Rahul.Pisat@akzonobel.com]
Sent: 04 December 2009 09:04
To: materials-welding@googlegroups.com
Subject: [MW:3787] type coated Bolts carbon steel bolts ( A193 Gr. B7 ) fo Stainless steel flanges
Hello all,
Please recommend me the type of coated carbon steel bolts ( A193 Gr. B7 ) to use with stainless steel flanges.
I am sure no to apply galvanised bolts with SS flanges.
Our construction team is worried about the rusted of the carbon steel bolts to be apply with stainless steel flanges.
Please reply your recommendation for type of coating for bolts ?
Kind regards
Rahul
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