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RV: High Temp in Bolted Joints

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Title: Mensaje
 ( this mail was sent before  with a wrong Ref. ..sorry )
Somewhere I read the following specs. ". . .bolted joints subjected
to temperatures higher than 80º C ( 176º F ),shall be design with
A490 bolts, and with diameters not less than 1"...."
Is there any reason to prevent A325 bolts being used with a high 
temp. environement ?  ( paint protected bolts, bolts in black or galvanized bolts ? ).
Appreciate some enlightenment on this issue. 
Raul Labbé S.E.