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BLACK SURFACE COATED HIGH STRENGTH MOLTEN Zn-Al-Mg-BASED PLATED STEEL SHEET FOR BUILDING COMPONENT EXCELLENT IN FLEXURE PROCESSABILITY AND BUILDING COMPONENT USING THE SAME
BLACK SURFACE COATED HIGH STRENGTH MOLTEN Zn-Al-Mg-BASED PLATED STEEL SHEET FOR BUILDING COMPONENT EXCELLENT IN FLEXURE PROCESSABILITY AND BUILDING COMPONENT USING THE SAME
PROBLEM TO BE SOLVED: To provide a black surface coated high strength molten Zn-Al-Mg-based plated steel sheet for building component having tensile strength of 780 MPa or more, suppressed manufacturing cost, improved strength and flexure processability, and rich in corrosion resistance, and a building component using the same.;SOLUTION: There are provided a black surface coated 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 with a prescribed chemical composition, and having brightness of a surface L* of 60 or less 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 with dislocation density of 1.8 to 5.7×1014/m2 or a phase containing both phases is a main phase, area percentage of a hard second phase and cementite is 3% or less, carbide containing Ti with average particle diameter of 20 nm or less is dispersed and deposited and black oxide of Zn is dispersed in a molten Zn-Al-Mg-based coating layer having a specific composition at diffusible hydrogen concentration of 0.30 ppm or less, and a building component using the same.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2018,JPO&INPIT
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机译:解决的问题:提供一种用于建筑构件的黑色表面涂覆的高强度熔融Zn-Al-Mg基镀覆钢板,其抗拉强度为780 MPa或更高,可降低制造成本,提高强度和弯曲加工性,并具有丰富的腐蚀性能解决方案:提供了一种黑色表面涂层的高强度的用于建筑构件的熔融锌铝镁合金基镀钢板,在其上具有熔融的锌铝镁合金镀层。贝氏体铁素体相为单相的,具有规定的化学组成,表面L *的亮度为60以下,弯曲加工性优异,抗拉强度为780〜1100MPa的表面的白钢板的表面。或位错密度为1.8至5.7×10 14 Sup> / m 2 Sup>的铁素体相或包含这两个相的相为主相,硬质第二相的面积百分比为渗碳体含量为3%或以下,含有碳化物在扩散氢浓度为0.30ppm以下的具有特定组成的熔融Zn-Al-Mg基涂层中,分散并沉积平均粒径为20nm以下的Ti,并且将Zn的黑色氧化物分散在建筑物中。使用相同的组件;;选定的图纸:图1;版权:(C)2018,JPO&INPIT
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