FIELD: high-temperature heat-transfer apparatuses for mechanical engineering. SUBSTANCE: heat exchanger whose heat- transfer surface is made, for example, of carbon steel covered with heat- and corrosion-resistant coating has the latter built up of at least two layers; bottom layer contacting base metal is more compact than top and surface roughness of the latter is 2-20 times higher than that of bottom layer. EFFECT: improved efficiency and reduced cost of heat exchanger.
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