HIGH STRENGTH MOLTEN Zn-Al-Mg-BASED PLATED STEEL SHEET FOR BUILDING COMPONENT EXCELLENT IN FLEXURE PROCESSABILITY AND BUILDING COMPONENT USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a molten Zn-Al-Mg-based plated steel sheet for building component having higher tensile strength than conventional molten Zn-Al-Mg-based plated steel sheet, of which strength and flexure processability are improved at same time while suppressing excessive increase of manufacturing cost and a building component using the same.;SOLUTION: There are provided a high strength molten Zn-Al-Mg-based plated steel sheet for building component having a molten Zn-Al-Mg-based plated layer on a surface of a raw material steel sheet having a prescribed chemical composition, and excellent in flexure processability with tensile strength of 780 to 1100 MPa, in which a single phase of a bainitic ferrite phase or a ferrite phase, or a phase containing the bainitic ferrite phase or the ferrite phase with dislocation density of 1.8×1014/m2 to 5.7×1014/m2 is a main phase, area percentage of a hard second phase and cementite is 3% or less, and carbide containing Ti with average particle diameter of 20 nm or less is dispersed and deposited, and a building component using the same.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2018,JPO&INPIT