Cold Drawn Round Steel Bar Standard: GB/T 3078, GB/T905 Steel Grade: 10#,15#,20#,30#,35#,40#,45#, ... Specification : 6-80MM Commodity:Cold Drawn Steel Round Bars1) Standard: ... GB/T 3078, GB/T9052) Steel Grade: 10#,15#,20#,30#,35#, ... with good surface and high dimension precision. Cold Drawn Round Steel Bar