method for manufacturing an alloying-treated iron-zinc alloy dip-plated steel sheet excellent in press-formability

摘要

There is described a process for manufacturing an alloying-treated iron-zinc alloy dip-plated steel sheet excellent in press-formability, having, on the surface thereof, numerous fine concavities, by subjecting a cold-rolled steel sheet to a zinc dip-plating treatment in a zinc dip-plating bath having an aluminum content of from 0.05 to 0.30 wt.%, in which the temperature region causing an initial reaction for forming an iron-aluminum layer is limited within a range of from 500 to 600 DEG C , an alloying treatment in which an alloying treatment temperature is limited within a range of from 480 to 600 DEG C , and a temper-rolling treatment.