Hot Rolled vs. Cold Rolled

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Instead of asking a bunch of questions that might be asked incorrectly what are the differences between the two types (mild, SS, whatever alloys) in relation to welding, workability, final strength, machining, ect., ect. Thanks, jwr2200.
Reply:The only welding difference between hot rolled and cold rolled is the presence or absence of mill scale on the surface.  The mill scale on the hot rolled should be removed prior to welding.http://www.spaco.org/hrvscr.htmhttp://en.wikipedia.org/wiki/Hot_rollingLast edited by pulser; 07-25-2007 at 01:03 PM.
Reply:Hot rolled steel is put through the rollers HOT, and typically has mill scale on it.Cold rolled steel is put through the rollers cold (relatively speaking), and typically does not have mill scale on it.  Cold rolled steel -may- have a little better dimensional tolerance on it from the mill than hot rolled steel.  Neither 'raw' form is going to be high-precision though.Cold rolled steel often will have residual stresses in it (from the cold working/rolling process) that -may- cause it to warp or distort more when 'doing things' to it.  Like welding or machining.
Reply:I prefer my metal HOT...like my women. John -  fabricator extraordinaire, car nut!-  bleeding Miller blue! http://www.weldfabzone.com
Reply:not being picky, but cold rolled is actually rolled or formed hot it is just rolled till it cools to a certain temp therefore the closer tolerances and lack of mill scaleBTS Welding