... the development and manufacturing of leaf spring, with annual turnout of 30000 tons of leaf spring and 600000 tons of cold-rolling ... product lines with advanced equppments making different types of leaf spring including:1. conventional leaf spring2. z-type leaf spring3. parabolic ... used for :sup6, sup7, sup9, sup9A, 60Si2Mn,55CrMnA,50CrVA BYD6100 car leaf spring