The hard rolling plate is low, easy to process, and the extension performance is good.
The cold rolled sheet has a high hardness and is relatively difficult to process, but it is not easy to deform, and the strength is high.
The strength of the hot rolled sheet is relatively low, the surface quality is almost (low degree of oxidation), but the plasticity is good, generally a medium thick plate, cold rolled sheet: high strength hardness, high surface finish, generally a thin plate, can be used as stamping Plate.
Hot rolled steel plate, mechanical properties are far from cold processing, also forging processing, but has good toughness and ductility
Cold rolled steel sheets have a certain degree of processing hardening, low toughness, but can achieve a better reflexive ratio, used for cold bending springs, etc., because the yield point is closer to the tensile strength, the danger is not Predictivity, easy accidents when the load exceeds the load
Hot rolling is a steel sheet having a relatively thin-point temperature of a higher temperature of the steel plate; cold rolling is rolled under normal temperature conditions.
Generally, hot rolling is performed first, and then cold rolling. When the steel sheet is thick, it can only be hot rolled, and after rolling is thinned, cold rolling is performed. The hot rolled steel sheet is divided into two types of thick plates (thickness greater than 4 mm) and sheets (thickness of 0.35 ~ 4mm); the cold rolled steel sheet is only a sheet (0.2 to 4 mm thickness).
The termination temperature of the hot rolling is generally 800 to 900 ° C, and it is generally cooled in the air, so that the hot rolled state corresponds to the normal treatment. The metal material of the hot rolled state delivery is due to the surface covering a layer of oxide film, thereby having certain corrosion resistance, the requirements of the storage and transportation storage are not as strict, such as large, medium-sized steel, The medium and thick steel plate can be stored after the open air field or the sip.
Compared with the hot rolled state, the metal material of the cold-rolled state is high, the surface quality is good, the surface roughness is low, and has high mechanical properties. But it is easy to suffer from corrosion or rust, its packaging, storage and transportation has more stringent requirements, need to be kept in the warehouse and pay attention to the temperature and humidity control in the warehouse.
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