Cold Drawn Round Steel Bar Standard: GB/T 3078, GB/T905 Steel Grade: 10#,15#,20#,30#,35#,40#,45#, Specification : 6-80MM ... Steel Round Bars1) Standard: GB/T 3078, GB/T9052) Steel Grade: 10#,15#,20#,30#,35#,40#,45#,40Cr.3) Specification : 6 ... : absor and brake bar of automobile. QUALITY ASSURANCE:1) Strictly acc. To GB/T 3078, GB/T9052) Widely for HRSG, Boiler; Heat ...