Method for coating a hot-rolled or cold-rolled steel flat product containing 6-30 wt% Mn
AssigneeThyssenKrupp Steel Europe AG
InventorsManfred Meurer, Ronny Leuschner, Michael Steinhorst
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Abstract
A method for coating a hot-rolled or cold-rolled steel flat product, containing 6-30% wt. Mn, with a metallic protective layer by hot-clip coating in a melt bath. The coating, achieved with increased production reliability, is optimised by the steel flat product being subjected to a pickling treatment in which the manganese oxide adhering to the steel flat product is essentially fully removed in the pickling bath before the steel flat product enters the melt bath.
Claims19
A method for coating a hot-rolled or cold-rolled steel flat product, containing 6-30% wt. Mn, with a metallic protective layer by hot-dip coating in a melt bath, wherein the steel flat product is subjected to a pickling treatment before entering the melt bath, in which the steel flat product is exposed to at least two pickling baths, wherein the pickling baths each comprise 20-200 g/l of hydrochloric acid or sulphuric acid and optionally 10-200 g/l Fe and an acid concentration of the second pickling bath is higher than an acid concentration of the first pickling bath, so that manganese oxide adhering to the steel flat product is removed.
Dependencies are inferred from the claim text.