Use of Hot Rolled Steel Sheet
Hot rolled steel plate is made of continuous casting billet or initial rolling billet, heated by a step-type heating furnace, descaled by high-pressure water and then enters the rough rolling mill. The rough rolled material passes through the head and tail, and then enters the finishing mill for controlled rolling. After the final rolling, it is cooled by laminar flow (computer controls the cooling speed) and coiled by the coiler to become a straight roll.
The difference between hot rolled steel and cold rolled steel:
1. Cold rolled steel plate has high hardness and is relatively difficult to process, but it is not easy to deform and has high strength. Hot rolled steel plate has relatively low strength and poor surface quality (oxidation and low finish), but good plasticity, generally medium and thick plates, cold rolled steel plate: high strength, high hardness, high surface finish, generally thin plates, can be used as punching plates.
2. The mechanical properties of hot rolled steel plate are far inferior to cold processing, inferior to forging, but its toughness and ductility are better. Cold rolled steel plate has a certain degree of work hardening, low toughness, but can achieve a good yield strength ratio. It can be used for cold bending spring leaves and other parts. At the same time, the yield point is close to the tensile strength, so there is a certain risk in use. When the load exceeds the allowable load, unforeseen accidents are likely to occur.
