30CrNiMo8 1.6580 forged round bar alloy steel 30CrNiMo8 steel Manufacturer Alloyed structural steel with medium hardenability designed for heavy duty ...
AISI5140 40Cr DIN1.7035 1.7045 41Gr4 42Gr4 forged round bar steel round bar steel manufactuer 40 Cr round bars are the steel of the standard of GB/T ....