Some differences between hot and cold rolled steel are; cold rolled has square corners, is more precise dimensionally, comes in 12 foot lengths and comes with a bright finish that is pickled and oiled, and is more expensive than hot rolled. Hot rolled has rounded corners comes with a mill finish and...

thanks, will do.

can anyone suggest what grade of aluminium to use for a utility type trailer? 6061 seems the best, but pricey.