PRODUCTION OF 299×10-60 mm SEAMLESS HOT-ROLLED PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERHIGH STEAM PARAMETERS OF 10?9???-?-GRADE STEEL

摘要

FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, particularly, to pipe rolling. Hollow ESR ingots are bores and turned to hollow billets sized to 500xvn.320x3200±50 mm. Said hollow billets are heated to 1180-1200°C and rolled at PRU 8-16" with Pilger rerolled hot-rolled pipes sized to 325x15x20300-20700 and 325x18x17600-18300 mm. Process wastes are cut off by hot-cutting saw, hot-rolled rerolled pipes are cut to lengths. The latter are straightened at six-roll straightener and subjected to heat treatment. They are accepted and rolled at CRM 450 to cold-rolled pipes sized to 299x10-15 mm.EFFECT: higher mechanical properties and precision of pipe sizes.3 cl, 1 tbl