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Pu castor cold rolled and hot rolled what are the difference

by:Dajin caster     2020-04-30
What are the difference between pu castor cold rolled and hot rolled, castor hot rolled plate hardness is low, easy processing, good extensibility. Castor strength of hot rolled plate is relatively low, the surface quality (nearly With low oxidation, finish) , but the plastic is good, generally for medium plate, caster manufacture: high strength, high hardness high surface finish, generally for sheet, can be a drawing board. Caster manufacture high hardness, processing is relatively difficult, but it is not easy deformation, high strength. Hot rolled steel plate, the mechanical properties of far less cold, also is inferior to the forging processing, but has good toughness and ductility. Cold rolled steel sheet due to a certain degree of strain hardening, toughness is low, but can reach better showed, used for cold bending spring pieces and parts, at the same time due to the yield point is close to the tensile strength, so no foresight to danger, in use process in the load exceeds allowable load are prone to accidents. By definition, ingot and billet at room temperature is very difficult to deformation, not easy processing, general rolling heating to 1100 ~ 1250 ℃, the rolling technology called hot rolled. Most of the steel rolling in hot rolling way. But because the surface of the steel at high temperatures generated easily oxidized iron, rough surface of hot rolled steel, size volatile, so the surface is bright and clean, precise size and good mechanical properties of steel, hot-rolled semi-finished or finished products as raw materials to production in cold rolling way. At room temperature rolling, general understanding for the cold rolled, from the point of view of metallography, cold rolling and hot rolling line should be distinguished by recrystallization temperature. Namely below the recrystallization temperature rolling for cold rolling, above the recrystallization temperature of rolling for hot rolling. Steel recrystallization temperature of 450 ~ 600 ℃. Hot rolled, as the name suggests, the temperature of the rolled piece is high, so the deformation resistance is small, can realize the large deformation. In the steel rolling, for example, the general casting billet thickness of about 230 mm, and after roughing and finishing, the final thickness of 1 ~ 20 mm. At the same time, due to the generous than small steel plate, relatively low dimensional accuracy requirements, it is not easy to strip shape problems, give priority to in order to control the crown. For organizations have requirements, generally by controlled rolling cold, open rolling by control of the finishing temperature, finishing temperature and coiling temperature to control the microstructure and mechanical properties of strip steel. Cold rolled, generally is not heated before the rolling process. However, due to the strip thickness is small, easy to strip shape problems. And, after the cold rolling of the finished product, therefore, in order to control the strip size accuracy and surface quality, adopted a lot of tedious process. Long cold rolling production line, equipment, process complex. What are the difference between pu castor cold rolled and hot rolled, more news and information about pu castor please click: hynews / 170. html
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