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Hot rolled steel is just that, it was heated and rolled while hot.......it is actually a weaker metal. Cold rolled steel is still heated, but rolled when cold. It is a stronger to work with and you have less chance of it buckling for no reason. So if you are going to use a metal for say the trans tunnel, you can use hot rolled since the tunnel isn't a stress point. If you were going to use it to support a floor, you would want cold rolled steal, since it is stronger and has less of a chance of buckling under stress. Hope that helps.