Grade 3SP 5SP Square Steel Billet Lme / Steel Square Bar Grade 3SP 5SP Square Steel Billet Lme / Steel Square Bar ASTM A387 Rust Proof . 1. Specification of mild steel billet: Steel Square bar/steel billet/ Standard: ASTM A387, EN1002822003,JIS G41092003, ASTM A542,etc. GB YB/T20112004GB/T7002006 GB/T222 GOST380 2005 ST . A572GR50 Q345B S355JR Low Alloy Hot Rolled Steel Plate Mill standard.
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