FIELD: metallurgy.
SUBSTANCE: proposed method comprises rolling the pipe-sleeve in rolls with passes, imparting oval shape to the sleeve immediately before the rolls of pipe lengthwise rolling mill. Increased uniform filling of the pass in lengthwise rolling at short cylindrical mandrel, reduced pipe-sleeve wall thickening in pass outlets is ensured by the fact that the pipe-sleeve is rounded, wherein the ratio of the greater axis of oval section of the pipe-sleeve to smaller axis shall be within the range of 1.15-1.25. In the process of rolling, large axis of pipe-sleeve oval section passes through the tops of passes.
EFFECT: invention can be used for rolling pipes in lengthwise rolling mills.
1 cl, 1 dwg
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