ZN-PLATED STEEL SHEET FOR HOT PRESSING HAVING EXCELLENT STRENGTH AND A SURFACE PROPERTY AND HOT PRESSED PART USING THE SAME CAPABLE OF PREVENTING DETERIORATION OF A PLATING LAYER SINCE WHEN PRESSING IS PRACTICED, THE ALLOYING OF A ZN-PLAYED LAYER IS ENCOURAGED AND THE MELTING TEMPERATURE OF THE ZN-PLATED LAYER QUICKLY RISES

摘要

PURPOSE: A Zn-plated steel sheet for hot pressing having excellent strength and a surface property and a hot pressed part using the same are provided to inhibit annealing oxide from becoming created on the surface of a steel sheet and form a uniform Zn-plated layer.;CONSTITUTION: A Zn-plated steel sheet for hot pressing having excellent strength and a surface property comprises a steel sheet, an Al-enriched layer, and a Zn-plated layer. The steel sheet comprises a superficial diffusing layer of metal less than Cr in the absolute value of the reduced amount of Gibb's free energy per Oxygen 1M when oxidation is made within a 1μm depth from the surface. The Al-enriched layer contains Al of more than 30weight%, which is formed on the superficial diffusing layer of the metal less than Cr in the absolute value of the reduced amount of Gibb's free energy per Oxygen 1M when oxidation is made.;COPYRIGHT KIPO 2012