carbon steel round bars,steel round bars Grade: 45#,40Cr,20#,20CrMnTi technique: hot rolled, forged carbon steel round bars,steel round bars Grade: 45# 45B S45C C45 CK45 Cm45 AIIS1045 SAE1045 ASTM1045 ... Applicationwelding is well,Used for making normal mechinery parts,such as bolt,chain,pull rod,shape steel,steel plate,flat bar steel and so ...