4mm stainless steel wire

Safety
During the drawing process, the drawing stress σ1 of the drawing force acting on the unit cross-sectional area of the drawn metal wire at the exit of the die. In order to cause the metal to undergo plastic deformation in the die hole, the drawing stress σ1 must be greater than the deformation resistance σT of the metal in the deformation zone in the die hole; and in order to prevent the metal wire from continuing to deform after it exits the die hole, it will be thinned or broken to destroy the stable wire. In the drawing process, the drawing stress σ1 must be less than the yield limit σs of the drawn metal wire after the die hole, so the conditions for realizing the drawing process are usually expressed as: σT<σ1<σs. The ratio K to them is called the safety factor of the drawing process.