FIELD: process engineering.
SUBSTANCE: invention relates to pipe rolling. Conical billets are cast with shrink head of 540/555x1650 mm as well as continuously cast billets of 550x1750-2100 mm. Through central 100±5 mm diameter bore is drilled therein. Sleeves are heated to ductility temperature. Ingots sized to 540/555×100×1650 mm are pierced to 560×ID390×2870 mm sleeves with diameter increase over ingot length of 0.9-3.7% and continuously cast 550×100×1750-1850 m to sleeves sized to 550×ID390×3300-3500 in OD. Pipe lengths are rolled at Pilger mill 390 mm roll-pass with pipe turn-over through 70±2°. Pipe are cut to gaged lengths and process wastes are remove to heat said lengths in gas roll furnace to 880-900°C. Pipes are gaged at sizing mill with total diameter decrease of up to 1.8% and straightened at oblique roll machine.
EFFECT: decreased metal consumption factor.
2 cl, 1 tbl
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