... :No. 2B, No. 3, No.4,BAUsage:construction field, building industry, petroleum & chemical industries, machinary, hardware fields, and so ... discontinuous coarse stria, used as inner and external ornaments for building, electrical appliances and kitchen utensils etc. NO.4 Polished ... streaks, mainly used as buildings ornaments elevators,door of building, frontal plate etc. BA Cold rolled, bright annealed ...