PRODUCTION OF 465×15-60 mm SEAMLESS HOT-ROLLED PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERHIGH STEAM PARAMETERS FROM ESR INGOTS OF 10?9???-?-GRADE STEEL

摘要

FIELD: process engineering.SUBSTANCE: invention relates to metallurgy, particularly, to pipe production. Proposed method comprises casting the ingots by electric slag remelting. Said ingots are turned to ingots-blanks to bore central 100±5 mm diameter hole therein. Said billets are heated to ductility temperature and pierced at helical rolling mill to get the sleeve billets. Said sleeves are rolled at Pilger mills to commercial 465×15-60 mm pipes. Said pipes ate subjected to heat treatment, etching, straightening, ultrasound control and acceptance with diameter and wall depth allowances.EFFECT: higher mechanical properties, accurate sizes, electric power saving and lower loads at helical rolling mills.3 cl, 1 tbl