FIELD: metallurgy.
SUBSTANCE: prevention relates to production of rerolled "426×34×10500±250" mm pipes at PRU 8-16'' with Pilger mills from billets of titanium alloy GR 29. Ingots are cast in vacuum arc furnace and subjected to forging and turning to billets. Central hole is drilled in the billet to be schooped with Al2O3, heated in continuous furnaces to 1150-1180°C at the rate of 2.8-3.2°C/min with turn-over in 18-20 minutes through α=(190±10)°, held at ductility temperature at 4-3 openings of the furnace first zone for 25-30 minutes and turned over from 3rd opening into furnace pit. Billet is pierced at helical rolling mill to sleeves and rolled at Pilger mill to rerolled pipes. Process wastes are cut off by hot cutting saw and straightened at six-high cluster mills in two-three passes to curvature not over 6 mm over pipe length.
EFFECT: decreased quantity of rejects.
4 cl, 1 tbl
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