... bars Grade: 45#,40Cr,20#,20CrMnTi technique: hot rolled, forged carbon steel round bars,steel round bars Grade: 45# 45B S45C ... SEP1921 C/c or GB/T6402Quality Controltest products mechanical and chemical properties in every procedure(third party inspection institution:CIQ,SGS ... for making normal mechinery parts,such as bolt,chain,pull rod,shape steel,steel plate,flat bar steel and so onPackaging ...