Cold rolled aluminum plate to take the hot rolled aluminum plate is not the same: the aluminum rolling at room temperature as usual know as cold rolled, from the viewpoint of metalism, below the crystallization temperature of the rolling for cold rolling. Hot rolling, is to slab (mainly for continuous casting billet) as raw material, after heating by the fine rolling unit and finishing unit made of strip.
Cold rolled aluminum plate: hot rolled steel coil as raw material, after pickling to remove the oxide skin held cold rolling, the finished product for the rolled hard volume, due to continuous cold deformation inspired by cold softening of the rolled hard volume of strength, hardness rise, toughness and plastic target reduction, stamping performance will deteriorate, can only be used for brief deformation of the parts. Rolled hard volume can be used as raw materials for hot-dip galvanizing plant, because hot-dip galvanizing units are set up to retreat from the outpost. Rolling hard coil weight is usually 6 ~ 13.5 tons, the steel coil is at room temperature, the hot-rolled pickling volume to hold a continuous rolling.
Cold rolled is being processed by the hot rolled plate at room temperature, although the process of rolling will also make the steel plate warming, but nevertheless called cold rolled. Cold rolled aluminum plate, is being rolled out of the basic processing of hot rolled coil, as usual to say is hot rolled – pickling – cold rolled such as the process.
Briefly, a piece of steel billet is heated (that is, the kind of burning white hot steel in the TV) fine over a few rolling, and then cut the edge, corrected to become a steel plate, which is called hot-rolled. Because there is no annealing treatment, its hardness is very high (hrb greater than 90), machining performance is very good, can only hold a brief bias less than 90 degrees of bending processing (perpendicular to the roll taking bias).
Due to the hot rolled aluminum plate after continuous cold transformation into cold rolled, being mechanical properties are comparatively good, the hardness is too high. Must be annealed to restore its mechanical properties, no annealed called rolled hard volume. Rolled hard volume as usual is used to do without bending, stretching products, 1.0 thickness rolled hard luck on two or four sides of the bending.
