... :16-250mm, length:2000-3500mm hot rolled carbon steel round bar S50C / SAE1050 is usually used for making injection palstic moulds ... , mould frames etc.hot rolled carbon steel round bar S50C / SAE1050 1) Chemicial composition: C=0.40~0.50 ... , Mn=0.60~0.70, P≤0.016, S≤0.008,Cr≤0.023, Ni≤0.014, Als≤0.005, Cu ... : ASTM 1050 GB 50# JIS S50C DIN 1.1191 Round bar