PRODUCTION OF SEAMLESS HOT-ROLLED PIPES SIZED TO 610×28-32×5300-6000 mm FROM '15Х1М1Ф'- AND '10Х9МФБ-Ш'-GRADE STEELS FOR PIPELINES OF BOILER UNIT STEAM INTERMEDIATE OVERHEATING

摘要

FIELD: process engineering.;SUBSTANCE: invention relates to production of pipes for pipelines of boiler unit intermediate steam overheating. ESR process is used to smelt hollow ingots to be bored and turned to 720×ID.560×3200±50 mm-ingots. Ingots-billets are heated to ductility temperature and rolled at PRU 8-16'' with Pilger mill to commercial pipes at rolls with body diameter of 1150 mm and groove of 620 mm at diameter reduction of 11.4% and rolling-out μ of 2.01-2.29.;EFFECT: lower metal input, higher precision of geometrical sizes.;8 cl, 2 tbl