冷轧钢板与热轧板的对比（Comparison of cold rolled steel sheet and hot rolled plate）.doc

冷轧钢板与热轧板的对比（Comparison of cold rolled steel sheet and hot rolled plate） Hot rolled plate and cold rolled plate Hot rolled steel sheets are much less mechanical and less ductile, but have better toughness and ductility Due to work hardening of cold rolled steel plate, a certain degree of toughness is low, but can yield better than that used to cold spring piece parts, at the same time as the yield point is close to the tensile strength, so the use of risk is not predictable, prone to accidents in the load exceeds the allowable load 1) cold plate used in cold rolling surface nonscale, good quality. With hot plate hot processing surface oxide skin thickness is poor. 2) the toughness and surface roughness of hot rolled plate are bad, the price is lower, and the cold rolled plate has good extensibility and toughness, but the price is more expensive 3) the rolling is divided into cold rolling and hot rolling, with recrystallization temperature as the regional point 4) cold rolling: cold rolling is generally used to produce strip, and its rolling speed is higher, Hot rolling: the temperature of hot rolling is similar to that of forging 5) hot plate surface plating black brown, plating cold rolled plate surface is grey. After plating from the surface smoothness to distinguish, smoothness is higher than that of cold rolled hot plate. 6) hot-rolled plate strength is relatively low, the surface quality almost (oxidation \ smooth finish low), but the plasticity is good, generally for the plate, cold rolled plate: high strength / high hardness, surface finish is high, generally for sheet, can be used as stamping plate 7) hot-rolled steel plate is divided into thick plate (thickness greater than 4mm) and sheet (thickness of 0.35~4mm) two kinds; cold-rolled steel sheet only (thickness of 0.2 ~ 4mm) a kind. Hot rolled coil and cold rolled coil Cold rolled coil is made of hot-rolled coil, which is rolled under recrystallization, but it is generally understood to be rolled by rolling