Black back cold-rolled strip steel major consideration user processing, cold-rolled strip steel after by customers for use by all soft (annealed), semi-soft, chilled state, since the mechanical properties provide the product according to user requirements , ease of processing into a flat, shaped springs and other metal parts, the user can according to their own requirements for machined parts further processing. Users can choose to use according to its processing requirements. Strip thickness dimension accuracy up to less than 0.01mm, the user can choose according to the precision requirements into product needs. Average thickness of cold rolled strip production company for 0.2 ~ 2.0mm, width of 660mm or less; are hot-rolled strip steel as raw material, at room temperature after cold rolling mill rolling timber. Cold-rolled strip steel with smooth surface, smooth, high dimensional accuracy and good mechanical properties, etc., most of the product into a roll. Cold-rolled coiled high production efficiency, easy to use, is conducive to subsequent processing. Therefore widely used, has been gradually replaced by hot rolled sheet stack of the same thickness. Only a small number of special-purpose piece of rolling cold-rolled alloy steel plate taken.