Tubing

Can anyone tell me the difference between HREW & CREW?

I can't say that I have ever heard of CREW tubing. HREW is Hot Rolled Electric Weld and is first bent into square tubing, then welded and made into round tubing. As far as plate steel and sheet metal, cold rolled is very accurate when it comes to dimensions. Cold rolled also doesn't have any mill scale on it.

I would assume CREW is Cold Rolled Electric Weld. If this is true then DOM, Drawn Over Mandrel, would be essentially the same thing.

Because of DOM's accurate dimensions it can be tapped with out drilling and has no visiable weld seam. It is also somewhere around 25% stronger.

It does stand for cold rolled electric weld but I was wondering strengthwise & pricewise the difference between HREW & CREW. Thank you for your info., though.