A kind of hot-dip galvanized high-strength steel with excellent fe-al alloy layer characteristics and its manufacturing method

A manufacturing method and hot-dip galvanizing technology, which are applied in the plating of superimposed layers, hot-dip plating process, metal material coating process, etc., can solve the problems of unevenness, lack of Fe-Al alloy layer, discontinuity, etc. Increase the content, improve the effective contact, and facilitate the formation of the effect
CN110760771BActive Publication Date: 2022-07-22BAOSHAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BAOSHAN IRON & STEEL CO LTD
Publication Date
2022-07-22

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Abstract

A hot-dip galvanized high-strength steel having the characteristics of an excellent Fe-Al alloy layer and a manufacturing method thereof, the hot-dip galvanized high-strength steel sequentially comprises a substrate, an Fe-Al alloy layer and a galvanized layer, and the chemical composition of the substrate is weight percent are: C: 0.15-0.25wt%, Si: 1.00-2.00wt%, Mn: 1.50-3.00wt%, P≤0.015wt%, S≤0.012wt%, Al: 0.03-0.06wt%, the rest are Fe and Impurities are unavoidable; the missing area of ​​the Fe-Al alloy layer is less than 5%, the Fe-Al alloy layer is uniform, complete, and has consistent appearance characteristics, and the hot-dip galvanized steel sheet obtained after hot-dip galvanizing has good appearance quality, no leakage plating, Defects such as pitting and chromatic aberration are suitable for automotive structural parts and outer panels that have high requirements on surface quality and formability.
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Description

technical field

[0001] The invention belongs to the technical field of hot-dip galvanized steel sheets, and in particular relates to a hot-dip galvanized high-strength steel with the characteristics of an excellent Fe-Al alloy layer and a manufacturing method thereof. Background technique

[0002] When the steel plate is hot-dipped with pure zinc (without adding aluminum), the alloy layer formed by the Fe-Zn reaction is thick and brittle, resulting in poor workability, and the zinc layer is prone to fall off during bending deformation. In order to inhibit the growth of Fe-Zn alloy layer in modern continuous hot-dip galvanizing production lines, a small amount of aluminum (about 0.2%) is added to the zinc solution. Since the chemical affinity of aluminum to iron is higher than that of zinc to iron, A selective reaction occurs on the surface of the steel sheet, and a thin Fe-Al alloy layer is first formed, thereby inhibiting the diffusion of zinc.

[0003] At present, the dem...

Claims

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