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The paper presents the results of a study on the corrosion behaviour of the sheets of drawing steel with 0,04% C gone through natural ageing and run for a period of 112 days from the moment of drawing. The researches highlighted the fact that the phenomenon of natural ageing speeds up the corrosion process. As a result the durability of the products realized from sheet and straps of steel depend also on the protection of their surfaces through different coating procedures.