A kind of zinc-aluminum-magnesium wire drawing coated steel plate and its production method

Abstract

The invention discloses a zinc-aluminum-magnesium wiredrawing coated steel plate, which comprises a steel substrate, and is characterized in that the wiredrawing surface is a passivation film, a zinc-aluminum-magnesium coating, and a steel substrate in sequence from the outside to the inside; Chemical film, zinc-aluminum-magnesium coating, steel substrate, the chemical composition of zinc-aluminum-magnesium coating is Al 6.1%-13.8% by mass percentage, Mg1.5%-6.7%, Si1.5%-4.2%, Fe0.1% ~0.5%, mixed rare earth ≤0.15%, the rest is Zn; the thickness of Zn-Al-Mg coating on the drawing surface is ≥8 μm, the thickness of Zn-Al-Mg coating on the undrawn surface is 12 μm~30 μm, the surface hardness of Zn-Al-Mg coating is HV120~HV200, and the drawing surface is transverse Ra≤0.5μm, Rz≤4, 200≥Rpc≥140( / cm).

Description

technical field [0001] The invention belongs to the field of hot-dip coating of steel plates, in particular to a zinc-aluminum-magnesium wire-drawn coated steel plate and a production method thereof. Background technique [0002] Due to its excellent anti-corrosion properties, hot-dip coated steel sheets have been widely used in automobiles, home appliances and other fields. Compared with the traditional hot-dip galvanized steel plate, the hot-dip galvanized aluminum-magnesium coating has better corrosion resistance, and has been highly valued by advanced steel companies in Europe, the United States, Japan and South Korea. South Korea's Posco, Japan's Nippon Steel, and large European and American steel companies have successively developed products such as ZM, Z6A3M, and Z10A3M. CN101812653A, US6235410B1, etc. developed zinc-based coatings containing aluminum and magnesium, which greatly improved corrosion resistance. [0003] Due to the addition of Al and Mg elements on t...

AI Technical Summary

Problems solved by technology

CN102848639A proposes an aluminum-based coated wire drawing board, but the price and cost of aluminum are relatively high, and the surface of aluminum is relatively soft, so there is a certain degree of difficulty in the process for wire drawing machining

However, the hardness of the surface of the galvanized layer is lower than that of the steel plate, and it is difficult to carry out wire drawing processing, and the coating layer is thinned to a certain extent after wire drawing, and the corrosion resistance is greatly affected, so it cannot completely replace the stainless steel wire drawing plate.

[0005] The surface hardness of ordinary zinc layer is significantly lower than that of stainless steel, and galvanized sheet is a composite sheet combined with zinc layer and substrate after all. Using traditional stainless steel wire drawing process to process traditional hot-dip galvanized products will cause many problems. Such as napping, delamination, straining, etc. Therefore, in order to completely replace the high-cost stainless steel wire drawing steel plate, it is necessary to improve it from various aspects such as galvanizing process, coating variety and wire drawing process.

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