FIELD: metallurgy.
SUBSTANCE: hollow ingots sized to 470×110×2700 or 430×105×2700 mm are ESR cast. Said ingots are turned and bored to hollow ingots-billets sized to 460×100×2700 and 420×95×2700 mm. Said ingots-billets are heated to ductility temperature and rolled at Pilger mill on taper mandrels to rerolled hot-rolled pipes. The latter are turned, bored and rolled at mill "ХПТ" to commercial oil-well tubing sized to 114.3×6.88×9000-10700 mm. Use of hollow ESR ingots allows reducing the metal input.
EFFECT: higher quality of pipes.
4 cl, 1 tbl
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