PRODUCTION OF SEAMLESS HOT-ROLLED PIPES SIZED TO 610×28-32×4700-5400 mm FROM 15?1?1?- AND 10?9???-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: invention can be used for production of seamless hot-rolled pipes from "15?1?1?"- and "10?9???-?"-grade steels for pipelines of the steam intermediate overheating at boiler units. Hollow ESR ingots are bored and turned to hollow blanks sized to 670xvn.370x1650±50 mm, heated to ductility temperature and broached-rolled at cross-rolling mill to sleeves sized to 600xvn.590x3280-3480 mm. Sleeves are rolled at PRU 8-16'' with Pilger mills to commercial pipes sized to 610x28-32x4700-5400 mm.EFFECT: higher mechanical properties and precision of pipe sizes.7 cl, 2 tbl