METHOD OF MANUFACTURING OF SEAMLESS HOT FINISHED MACHINED PIPES WITH SIZE ID489+3,0/-0×19,5+3,0/-0×4090+40/-0 AND ID489+3,0/-0×19,5+3,0/-0×2500+40/-30 mm OUT OF STEEL GRADE 38??3??? FOR BOTTLES MANUFACTURING

摘要

FIELD: metallurgy.SUBSTANCE: blanks with size 630×100×1360 mm are heated to plasticity temperature. They are pierced in helical rolling mill to shell-blanks with size 650×ID340×1660 mm and are heated to the plasticity temperature. The shell-blanks are pierced-rolled in helical rolling mill to shells with size 660×ID515×2900 mm at the mandrel with diameter 500 mm and drawing µ?=1.75 and rise as to diameter ?=1.54%. Shells are rolled in Pilger mill in gauge 548 mm, cut in rolls with barrel diameter 1150 mm, in semi-finished pipes with size 538×30×7100 mm with polishing coefficient K=7.5, reduction ratio µ=2.77 and with diameter reduction ?=21.2%. The semi-finished pipes are cut to pipes having multiple length 4300 and 2800. Pipes are bored and turned to commercial pipe-blanks with size ID489+3.0/-0×19.5+3.0/-0×4090+40/-0 and ID489+3.0/-0×19.5+3.0/-0×2500+40/-30 mm.EFFECT: reduced metal consumption.1 tbl