Noun
drop forging (uncountable)
A forging process where a hammer is raised and then dropped onto the workpiece to deform it according to the shape of the die.
Workpiece materials The materials that are used most commonly in drop forging are aluminum, copper, nickel, mild steel, stainless steel, and magnesium. Source: Internet
Mild steel is the best choice, and magnesium generally performs poorly as a drop forging material. Source: Internet