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Subject: Black coating on new steel flat bar stock?


Author:
Brad
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Date Posted: 12:25:45 12/23/02 Mon
 When I buy steel at my local steel supplier, it seems to have some type of very thin black coating on it. It is pretty tough and a wire brush will barley make a dent in it. I can’t tell if it’s something the manufacturer puts on the steel to keep it from rusting or if it is some type black rust or what.

What is it? And do I need to remove it before MIG welding it?

Any help is appreciated.

Brad
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Replies:
Subject Author Date
Re: Black coating on new steel flat bar stock?Jerry13:28:14 12/24/02 Tue

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