CLASSIFICATION BY TYPES OF DEFECT «PRODIR» ON AN INTERNAL SURFACE OF HOT-ROLLED PIPES by N. A. Glazunova, O. V. Rozhkova, I. A. Kovalyova

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DEFECT «TRACKS FROM CUTS ON ROLLERS» ON THE EXTERNAL SURFACE OF SEAMLESS HOTROLLED PIPES by I. A. Kovalyova, N. A. Hodosovskaya, I. A. Guzova, P. V. Babanjkov, A. V. Vengura

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RESEARCH OF INFLUENCE OF OXIDATION ON CONDITION OF THE BLANKS SURFACE FOR IMPROVEMENT OF QUALITY OF HOT­ROLLED SEAMLESS PIPES by I. A. Kovalyova, A. A. Kuchkov, A. V. Vengura, N. A. Hodosovskaya, I. A. Guzova, I. A. Ovchinnikova

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