1) Surface: bright,blue,yellow,black. 2) Materials: 65Mn, 50#, Q195,215,235,345 3)Thickness:0.3-2.4.mm Width: 40-230mm Spring steel strip Linyi Liangyu Steel Strip Co.,Ltd is specialized in all kinds of heat treatment quenching steel strip, cold rolled bright annealing material,hot rolled steel strip.1) Surface: bright,blue,yellow,black.2) Materials: 65Mn, 50#, Special Type (T8-T10), Low Carbon ...