What are the major differences ?

 

most steel products are the result of hot rolling. The difference between hot rolled steel and cold rolled steel is the mechanical and chemical properties imparted to the steel. This in turn depends on the customer's application for the steel and what properties they want in the product they are buying.

Rails, structurals, concrete reinforcing bars, wire rod, plates, and sheet and strip are all examples of hot rolled products. The plates, sheet and strip products could be used to manufacture pipes and tubes, construction materials (such as steel building cladding and decking) and body panels and stampings for the appliance and automotive industries. Wire, sheet and strip are examples of products that can be cold rolled. Wire is often used to manufacture cold formed or cold headed fasteners (eg. screws, bolts) while cold rolled sheet and strip are increasingly being demanded by the appliance and automotive industry for exterior applications due to their superior surface finish particularily as galvanized outer body panels on automobiles.

cold roll has much finer grain. smoother and less porous surface

hope it helps

 

So hot rolled is stronger ?

 

Hot colled is cheaper than cold as well.

 

go with cold..