B7 bolt for SS flange
B7 bolt for SS flange
(OP)
Somebody said that using B7 (without protection) bolt for external SS flange (no thermal insulation) shall be inhibited because this is a dissimmilar metal contact and galvanic corrosion could occur (because rain water could be electrolyte).
Therefore isolation kit or coating shall be applied for preventing galvanic corrosion.
However, B7 bolting has been used for SS Pressure Vessel and there is no problem until now.
How about member's opinion?
In addtion, what type of coating should be used, if I applied coating for bolting?
Therefore isolation kit or coating shall be applied for preventing galvanic corrosion.
However, B7 bolting has been used for SS Pressure Vessel and there is no problem until now.
How about member's opinion?
In addtion, what type of coating should be used, if I applied coating for bolting?





RE: B7 bolt for SS flange
in marine environments the cs bolt can suffer from galvanic corrosion.
S
Corrosion Prevention & Corrosion Control
RE: B7 bolt for SS flange
http://www.dstan.mod.uk/data/02/862/01000200.pdf
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: B7 bolt for SS flange
http://www.whitfordww.com
RE: B7 bolt for SS flange
"Carbon steel bolts in stainless steel members should be avoided because the ratio of the area of the stainless steel to the carbon steel is large and the bolts will be subject to aggressive attack"
http://www.bssa.org.uk/topics.php?article=95
mil-std on galvanic corrosion
http://www.wbdg.org/ccb/FEDMIL/std889b.pdf
S
Corrosion Prevention & Corrosion Control
RE: B7 bolt for SS flange