A method for hot dip coating of a 2-35 wt .-% Mn-containing steel flat product and flat steel product
2009
The present invention relates to a method with which 2-35 steel flat products wt .-% Mn containing blank provided with a well adhering Zn plating. For this purpose the method provides for the present invention that the respective flat steel product amount forming at 600-1100 ° C annealing temperature Tg via an annealing time of 10-240 s with a reducing in relation to existing on the flat steel product FeO and oxidizing with respect to the contained in the steel substrate Mn acting annealing atmosphere is annealed, the N In this way, at least partially covering MN-mixed oxide layer is formed on the flat steel product. Thereafter, the annealed steel flat product is cooled to a bath-entering temperature at which it then s is passed through a saturated in iron, from 420 to 520 ° C hot-Zn molten bath within an immersion time of 0.1-10, in addition to the main component zinc and unavoidable impurities 0.05-5 wt .-% Al and / or contains up to 5 wt .-% Mg.
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