FIELD: process engineering.
SUBSTANCE: invention relates to lengthwise rolling of hollow rod-shape billets at continuous tandem mill. Tandem mill comprises main rolling mill 2 and extracting mill 4 located downstream of said main mill. Note here that said main and extracting mills allow processing of billet by at least one internal tool. Note also that said extracting mill is spaced from said main mill through the distance larger than maximum length of said hollow billet and internal tool. Besides, it comprises means to extract billet with internal tool at main mill outlet at spacing between said main and extracting mills and to discharge it in transverse direction.
EFFECT: higher quality of billets.
9 cl, 4 dwg
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