PRODUCTION OF SEAMLESS HOT-ROLLED PIPES SIZED TO 610×28-32 mm FROM '15Х1М1Ф'- AND '10Х9МФБ-Ш'-GRADE STEELS AT PRU 8-16'' WITH PILGER MILLS FOR PIPELINES OF BOILER UNIT STEAM INTERMEDIATE OVERHEATING WITH HIGHER MECHANICAL PROPERTIES

摘要

FIELD: metallurgy.;SUBSTANCE: ESR billets sized to 620x100x1250±50 mm are heated to 1270-1290 and 1190-1210°C and pierced at helical rolling mill to sleeves sized to 650 xvn 390x1610-1740 mm. After cooling and dressing, the billets are heated from cold charge to 1270-1290 and 1200-1210°C and pierced-rolled at helical tolling mill. Billets are rolled at PRU 8-16'' with Pilger mills to commercial pipes sized to 610×28-32×4500-5500 mm, process wastes are cut off by hot cutting saw, straightened, heat treated, etched, dressed, straightened, subjected to ultrasound control and accepted.;EFFECT: lower metal input, increased pipe length.;2 cl, 2 tbl