Hot Rolled vs. Cold Rolled steel

[GeneStoner]

What is the difference between Hot and Cold rolled steel?

[Mike W]

There is a recent post about that. Hot rolled has the mill scale on it. Cold has a smooth finish and more precise dimensions. It will also tend to warp like crazy due to internal stresses if you try to machine it.

[MadMax]

Cold rolled is typically harder, and hot rolled is a bit more malleable. I have found cold rolled easier to weld. Also, cold rolled is a bit better structurally.

-Max

[TOMWELDS]

Cold rolled is typically harder, and hot rolled is a bit more malleable. I have found cold rolled easier to weld. Also, cold rolled is a bit better structurally.

-Max

Max, i think its the other way around. Cold rolled is easier to machine but i find it rust a hundred times more than HR. Try turning HR on a lathe and you'll see what i mean.

[MadMax]

Max, i think its the other way around. Cold rolled is easier to machine but i find it rust a hundred times more than HR. Try turning HR on a lathe and you'll see what i mean.

I know . But see which one is easier to form (ie fender, gastank etc.) Hot rolled is 'softer' which would give it worse machining propertys, but make it more malleable. As far as rust, I don't know, but it would make sense that Coldrolled rusts easier, since it has NO protection.

-Max

[TOMWELDS]

I'll try this tomorrow. I used to work in a factory were all we did was form CRS in punch press's. But then again we were after a good finish too, which HR wouldnt give us.