Dillinger's sour-gas-resistant steels convince users with their high cleanness and their homogenous structure – the most important preconditions for the prevention of hydrogen-induced cracking (HIC) in pipelines and pressure vessels.
The occurrence of hydrogen-induced cracking (HIC) when steels are used in so-called sour-gas service is the result of an electrochemical corrosion reaction between an acidic fluid and the surface of the steel. Atomic hydrogen is evolved from hydrogen sulphide (H2S) in an acidic and moist environment and recombines to form molecular hydrogen (H2) at lattice defects and interfaces, such as non-metallic inclusions, segregations or micropores, for example. This hydrogen can then cause cracking in the material. Sour-gas-resistant steels have a high cleanness and a homogenous microstructure and thus provide fewer points of attack for the hydrogen. This is made possible by the use of specific processing routes, in combination with carefully harmonised quality-assurance provisions.
Innovative top-quality steel products, total orientation around our customers' needs and unceasing technological development in close cooperation with our partners form the basis of our success - as they have for more than 330 years.
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