Cold Drawn Round Steel Bar Standard: GB/T 3078, GB/T905 Steel Grade: 10#,15#,20#,30#,35#,40#, ... -80MM Commodity:Cold Drawn Steel Round Bars1) Standard: GB/T 3078, GB/T9052) Steel Grade: 10#,15#,20#,30#,35#,40 ... of automobile. QUALITY ASSURANCE:1) Strictly acc. To GB/T 3078, GB/T9052) Widely for HRSG, Boiler; Heat Exchanger, Condensor; Pipeline ...