METHOD FOR APPLYING A PROTECTIVE COATING TO A FLAT STEEL PRODUCT AND FLAT STEEL PRODUCT HAVING A CORRESPONDING PROTECTIVE COATING

摘要

The invention relates to a method for applying a protective coating (10) to a flat steel product (100), wherein the protective coating (10) is produced by guiding the flat steel product (100) having a strip entry temperature of 400-490 degrees Celsius through a molten zinc alloy bath. The molten zinc alloy bath (11) has a bath temperature of 400-480 degrees Celsius and contains an aluminum fraction and a magnesium fraction. In particular, the molten zinc alloy bath (11) has the following composition: the aluminum fraction is in the range between 1.8 and 3.0 weight percent; the magnesium fraction is in the range between 1.3 and 2.7 weight percent; the aluminum fraction in weight percent is greater than the magnesium fraction in weight percent; the ratio of the magnesium fraction in weight percent to the sum of the aluminum fraction in weight percent and the magnesium fraction in weight percent is in the range between 0.31 and 0.44; and the remainder of the molten zinc alloy bath is zinc and unavoidable impurities.

主权项

1. A method for applying a protective coating (10) on a flat steel product (100), wherein the protective coating (10) is produced by guiding the flat steel product (100) having a strip entry temperature in the range between 400 and 490 degrees Celsius through a molten zinc alloy bath (11), wherein the molten zinc alloy bath (11) has a bath temperature in the range from 400 to 480 degrees Celsius and has an aluminum content and a magnesium content, wherein the molten zinc alloy bath (11) has the following composition:
the aluminum content lies in the range between 1.8 and 3.0 weight percent; the magnesium content lies in the range between 1.3 and 2.7 weight percent; the aluminum content in weight percent is greater than the magnesium content in weight percent; the ratio of the magnesium content in weight percent to the sum of the aluminum content in weight percent and the magnesium content in weight percent lies in the range between 0.31 to 0.44; and the remainder of the molten zinc alloy bath (11) are zinc and unavoidable impurities.