FIELD: metalworking. SUBSTANCE: invention, in particular, relates to nitrocementing and can be used for manufacturing tubing and tubular goods with strengthened inside surface. Gas-nitrocementing process increased local protection of surface by way of coating, heating, and diffuse saturation in gas carburizer atmosphere. Protective coating is formed by applying refractory clay onto surface before heating followed by drying this coating and applying onto the latter 1:3 iron oxide-liquid glass mixture. EFFECT: protected outside surface against carbonization without loss in quality characteristics. 1 tbl
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