FIELD: rolled tube production, namely tube piercing in helical rolling mills, possibly manufacture of tubes in tube rolling aggregates with pilger mills. SUBSTANCE: in piercer ingot deformation is realized along crystal arrangement due to guiding ingot to mill by its head portion and piercing ingot at diameter fitting it by normalized value. EFFECT: elimination of expenses for intermediate heating and forging reduction of ingots due to changing pattern of prestressed conditions of metal in piercer. 1 cl
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