PRODUCTION OF SEAMLESS HOT-ROLLED MACHINED 610×36,53 mm PIPES OF 15X5M GRADE STEEL FOR COMMUNICATIONS OF REFINERIES

摘要

FIELD: process engineering.;SUBSTANCE: invention relates to pipe rolling. This process comprises forging the ingots to forged piece sized to 650×1630±50 mm, turning them and boring therein of central bores to get 630±10×100±5×1630±50 mm billets. Said billets are heated to 1285-1295°C, pierced at helical rolling mill at 325 mm diameter mandrels with diameter increase to 1.59% sleeve billets sized to 640×ID340×2150-2280 mm. The latter are pierced-rolled to rerolled sleeve billet sized to 650×S_r.s.b., whereS_r.s.b. is depth of the wall of rerolled sleeve billet, mm. Sleeve billets are pierced and rolled at the mandrel of diameter to be defined by relationship including parameters of rerolled sleeve billet and those of commercial pipe.;EFFECT: higher precision of geometrical sizes and surface quality of commercial pipes.;1 tbl