Cold-formed steel products produced by cold roll forming machines are widely used as important structural parts in many fields such as construction, automobile manufacturing, shipbuilding, electronics industry and machinery manufacturing. Its products types from the ordinary rails, doors and windows and other structural parts for special use, the cold-formed steel products are extremely wide. Cold section steel unit weight cross-section performance is better than hot-rolled steel products, and has a high surface finish and dimensional accuracy
The cross section performance of the unit weight of cold roll forming steel is superior to hot rolled steel. Furthermore, cold roll forming steel has a high surface finish and dimensional accuracy so it now is considered as a perfect replacement of hot-rolled steel products for it can both save steel material and energy consumption. So people put the development pf cold rolled steel into high status. It is the user constant desire for the cold-formed steel products that stimulate the cold steel forming making process.