FIELD: metallurgy. SUBSTANCE: method comprises steps of determining intermill elongation of a tube as a ratio of its reduction rate to a welding rate and restricting the intermill elongation value by a level, being heated before the reduction stage; determining maximally admissible total elongation value and limiting the total elongation of the tube by the level, being no more, than its maximally admissible value. EFFECT: enhanced accuracy of wall thickness control. 1 cl
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