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ASTM A311 / A311M Cold-Drawn Stress-Relieved Carbon Steel Bars Material 20Cr,40Cr, 40CrMo,20CrMo,35CrMo 42CrMo, , 45# ,SAE 1045 ,S45C ,SAE2150, SCr420,17Cr3, SAE5140,SCr440,41Cr4, SAE4118 ,SCM 420, ...