Describes the objects of coated steel having properties - coking, as well as the process implemented in order to obtain these objects by depositing a coating - coking on a matrix consisting of a steel, in general, a refractory steel. These include: - a substrate made of refractory steel containing at least 0, 2% by weight of carbon; - a diffusion barrier which is rich in carbon; - and an external layer having a content of 90 to 99% by weight of chrome.ces objects of coated steel consist more particularly of the tubes in furnaces or reactors used in various processes for the refining and petrochemistry.
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