Process Engineer

<cold finish and cold drawn>

cold drawn= Thickness reduction 10%+ a pass of previous thickness.

cold finish= Thickness reduction ~2% and straightening/surface hardening/polishing. This is the last pass before coiling up.

Hi Guest.

Cold Drawing is reduction in section by cold working by pulling through a carbide die. The cold work increases tensile and yield, strength, reduces %ra and % el, and increases the yield to tensile ratio.

This makes steel bars more machinable.

Cold finishing can be any bar fiinishing process employed at room temperature. For instance, a bar turning operation will get to the same diameter and straightness as a cold drawing line would, but because their was no cold work done to the bar, there is no alteration of mechanical properties. So you have a shiny, tighter tolerance bar with hot roll mechanical properties, but it has been cold finished.

Cold drawing is a cold finishing process, as are turning and polishing and grinding and polishing.

Thus, all cold drawn bars are cold finished, but not all cold finished bars are cold drawn.

ASTM A108 covers this, but in a much less clear way since the rewrite.

milo