Corten steel seamless texture12/5/2023 The susceptibility of paint coats to under creep age by rust is less in the case of weathering steel than in the case of comparable non-weathering steel. Coating is absolutely necessary in cases of contact with water for long periods, when permanently exposed to moisture, or if it is to be used in the vicinity of the sea. In cases of particular air pollution by aggressive agents conventional surface protection is recommended. When utilizing this steel in unprotected condition it is up to the designer to take into account the expected loss of thickness due to corrosion and as far as necessary, compensate for it by increasing the thickness of the material. In general the covering layer offers protection against atmospheric corrosion in industrial, urban and countryside climate. The amount of aggressive agents in the air has to be taken into account. exposed to or shaded from the weather, vertical or horizontal position). industrial, urban, maritime or countryside climate) and the orientation of the structure components (e.g. Its influence varies and depends mainly upon general weather condition (e.g. The layer protecting the surface develops and regenerates continuously when subjected to the influence of the weather.įormation, duration of development and protective effect of the covering layer on weathering steels depend largely upon the corrosive character of the atmosphere. The corrosion retarding effect of the protective layer is produced by the nature of its structure components and the particular distribution and concentration of alloying elements in it. The layer protecting the surface develops and regenerates continuously when subjected to the influence of the weather. Weathering means that due to their chemical composition steels exhibit increased resistance to atmospheric corrosion compared to unalloyed steels. The steel is an economical, long-lasting and fully recyclable material. The steel is self-protecting: the rust layer on the surface becomes a tight oxide layer that slows down the progress of corrosion. The anticorrosive properties of weather resistant steel are better than those of other structural steels in many applications. In marine environments, the formation of the protective patina may be slower due to chloride exposure. In industrial environments, the patina forms more quickly and is darker in color than in rural areas. Under normal weather conditions the patina will form in about 18–36 months, if the surface is alternately wet and dry.Īt first, the patina is a reddish brown color, but with time takes on a darker hue. The anticorrosive properties of weather-resistant steel are based on the protective oxide layer, called patina which forms on the surface of the steel.
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