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RE: STEEL: Galvanizing of High-Strength Bolting

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Title: STEEL: Galvanizing of High-Strength Bolting
Galvanizing temperatures are significantly lower that temperatures required for heat treatment of steel. Galvanizing should not effect heat treatment.
-----Original Message-----
From: Polhemus, Bill [mailto:bill.polhemus(--nospam--at)]
Sent: Tuesday, June 07, 2005 2:57 PM
To: seaint(--nospam--at)
Subject: STEEL: Galvanizing of High-Strength Bolting

Years ago the claim arose that mechanical galvanizing of A325 bolts was the only acceptable method, that hot-dip galvanizing tended to cause problems with (er, "grain growth?" or something?).

This may be why there are no longer A325 Type 2 bolts, I dunno.

What is the current thinking? I haven't thought about this for some time, and in typical structural engineery fashion I just keep putting "mechanical galvanizing only" on the drawings and specs.

I'd like to know what you all are doing.

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