METHOD FOR PRODUCING PIPE hex-blank sizes 'turnkey' 175 ± 0,4 × 2,5 + 0,3 / -0,2 × 2680 + 20 / -0 mm of steel grade 16H12MVSFBR-W FOR nuclear fast breeder reactor

摘要

A method of producing pipes hex-size blanks "turnkey" 175 ± 0,4 × 2,5 + 0,3 / -0,2 × 2680 + 20 / -0 mm steel 16H12MVSFBR-III for nuclear fast breeder reactors, characterized in that the casting is carried out by electroslag ingot method vn.290 diameter × 490 mm and grind them into hollow billet ingot measuring 480 × vn.300 × 3000 mm, the length of which is determined from the expression: where L = 5n + l = 14100 - maximum pipe length measuring 194 × 2.5 mm, which can be set for profiling a hexagonal pipe for the preparation of 5-hexagonal pipe blanks size "turnkey" 175 × 2,5 × 2680 mm; n = 2680 - nominal length hex-tube preform mm; l = 700 - length of the transition zone from the wheel to the hexagon and the end trimmings mm; l = 400 - length of end trim during rolling of mother tubes size 219 × 4 mm in pipe size 194 × 2.5 mm on the mill HPT 250 mm; μ- reduction ratio in the rolling of pipes of 219 × 4 mm in pipe size 194 × 2.5 mm; l = 400 - length of end trim during rolling metal recycling pipe size 273 × 8 mm in pipe size 219 × 4 mm on the mill HPT 250 mm; μ- reduction ratio in the rolling of pipes of 273 × 8 mm in pipe size 219 × 4 mm; l = 400 - length of the end howl trim during rolling of mother tubes size 325 × 12 mm tube size 273 × 8 mm in the mill HPT 450 mm; μ- reduction ratio in the rolling of tubes size 325 × 12 mm tube size 273 × 8 mm; μ- stretch factor at pilger mill during rolling hollow billets ESR ingots measuring 480 × L × vn.300 mm hot-rolled tube size 338 × 25 mm; L- length pig removable tube size 338 × 25 mm, which can be rolled on the weight of the head pilger mm; L - the length of the removed seed end during rolling of mother tubes size 338 × 25 mm; n - number repartition