What kind of material are the shelves in the supermarket made of?
Because the cold rolled coil relatively brittle and hard, not suitable for processing, so typically cold rolled steel demand after annealing, pickling and smooth surface will be delivered to customers, the maximum thickness of cold rolling is below 0.1 --8.0MM, the majority of factories such as cold-rolled steel plate thickness is below 4.5MM, the minimum thickness and width according to the plant equipment capacity and market demand and decision.
Different characteristics of Shenzhen shelves in the two kinds of technologies: cold rolling allows the local buckling section, which can make full use of bar buckling bearing capacity; but hot rolling does not allow local buckling, and it is very hard, it was their different advantages, use different rules, more suitable for cold rolling rack in the light shelf, and is suitable for storage of hot rolled heavy shelves using standard.(1) cold rolled steel can allow partial buckling of the cross section, so that the post buckling capacity of the member can be taken full advantage of, while the hot-rolled section steel does not allow partial buckling of the cross section.(2) the causes of residual stress in hot-rolled and cold-rolled steel are different, so there is a great difference in the distribution of sections. The residual cold-formed steel section stress distribution is curved, and hot rolled steel or steel welding section on the residual stress distribution is thin.(3) the free torsion rigidity of hot rolled steel is higher than that of cold rolled steel, so the torsion resistance of hot rolled steel is better than that of cold rolled steel.
Cold rolled steel: from ordinary hot-rolled steel by drawing more than the strain hardening stage of steel, high strength, but the shortcomings are toughness, weldability, hard and brittle.
The principle of cold rolling steel and hot rolled steel technologyHot-rolled steel is rolled by high temperature steel, although the strength is not very high, but plasticity, weldability, and therefore more commonly used;
