METHOD TO MANUFACTURE HEXAHEDRAL STOCK PIPES WITH FLAT-TO-FLAT DIMENSION 255×5+1,5/-1,0×4300+80/-30 mm FOR STORAGE AND TRANSPORTATION OF SPENT NUCLEAR FUEL

摘要

FIELD: technological processes.;SUBSTANCE: invention relates to rolling. Hollow bars are cast by electroslag melting from low plastic steel "04Х14Т5Р2Ф-Ш" with boron content from 2.0 to 3.0% with size of 470±5×vn.270±5×3000±50 mm. They are ground and turned into hollow blooms with size of 455±5×vn.280±5×3000±50 mm. Heated to temperature of 1040-1060°C. Rolled into pig pipe stocks with size of 287×11×25600-29600 mm on burnishers 266/267 with drawing µ from 9.69 to 10.86 and clamping by diameter Δ from 33.5 to 39.1%. Pipe stalks are cut with a hot saw into multiple-length pipes of 10200±50, 11500±100 mm and straightened. Multiple-length pipes are cut into two stock arms with length of at least 5000 mm. They are ground and turned into stock pipes with size of 280.8±2.0×5+1.5/-1.0 mm and profiled into hexahedral pipes of the specified size.;EFFECT: invention provides for reduced metal consumption.;5 cl