PRODUCTION OF SEAMLESS HOT-STRAINED MACHINED 610(36,53(3000-3400MM-PIPES FROM 08-18=10T-+-GRADE STEEL FOR NUCLEAR POWER PRODUCTION

摘要

FIELD: process engineering.SUBSTANCE: invention relates to pipe rolling. ESR blanks are heated to ductility temperature and pierced at screw rolling stand to sleeves-blanks. Rate of forming of the ends of sleeves-blanks at exit of rolls for the length of 0.50-0.75 of strain source length is decreased by 25-40%. Sleeves-blanks are heated from cold charge to ductility temperature and bored-rolled at screw rolling stand to rerolled sleeves-blanks. Rolling rate Vof lengthwise sleeves-blanks rear ends at roll outlet by length equal to 0.75-1.0 of deformation source is decreased and its magnitude is defined by expression:, where µis drawing at piercing to sleeve-blanks, µis drawing at rolling of sleeves-blanks to rerolled stock, Vis roll rpm at rolling. Rerolled sleeves-blanks are heat treated, bored and turned to commercial pipes.EFFECT: higher mechanical properties and precision of pipe sizes.1 tbl