Manufacturing method of aluminum-based alloy plated steel
The present disclosure relates to an aluminum-based plated steel that is provided for vehicles by hot forming, an aluminum-based alloy plated steel manufactured using the same, and method of manufacturing thereof.
1. A method of manufacturing an aluminum-based alloy plated steel having excellent corrosion resistance, comprising:
preparing a base steel comprising, by wt %, 0.18 to 0.25% of C, 0.1 to 0.5% of Si, 0.9 to 1.5% of Mn, 0.03% or less of P, 0.01% or less of S, 0.01 to 0.05% of Al, 0.01 to 0.5% of Cr, 0.01 to 0.05% of Ti, 0.001 to 0.005% of B, 0.009% or less of N, and a balance of Fe and inevitable impurities;
plating the prepared base steel by submerging the base steel in a hot-dip aluminum plating bath;
cooling the plated base steel at 3 to 25° C./s and manufacturing an aluminum-based plated steel having an Al-based plated layer;
heating the aluminum-based plated steel at 800 to 1000° C. for 3 to 20 minutes, wherein a change of the heating rate at a temperature range of 600 to 700° C. is 0.05° C./s 2 or less in absolute value; and
rapidly cooling the heated aluminum-based plated steel, wherein the rapidly cooling is performed to 300° C. or lower at a cooling rate of 20 to 200° C./s.
2. The method of claim 1 , wherein a heating rate during the heating is 1 to 10° C./s.
3. The method of claim 1 , further comprising:
forming the heated aluminum-based plated steel.