Deep drawing

Reverse drawing

Redrawing

Ironing

$$\sqrt 2 \,\,R$$

$$\sqrt 3 \,\,R$$

$$\sqrt {{\raise0.5ex\hbox{$\scriptstyle 2$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 3$}}} \,\,R$$

$$\sqrt {{\raise0.5ex\hbox{$\scriptstyle 3$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 2$}}} \,\,R$$

ferrous materials

ductile materials

hard materials

none of the above