Cold Drawn Round Bar Diameter:4mm-80mm Lengh:According to customers' requirements Material:Q235,45#,40Cr,20# Standard:GB Cold Drawn Round BarMaterials: Q235, 45 ... 10 years.Next we introduce the products as follows:1.steel grade: 55Cr3,SAE9254,SUP12V,55CrSi,60Si2CrVA,SUP6.SUP7 ... Tianjin ZF Steel Co., Ltd.Address: Room 607-612, Gate 1, Block 3, Qishui Yuan, Zhongjia Garden, Hongqiao District, Tianjin, ...