METHOD FOR MANUFACTURING HEXAGONAL TUBE PIPES OF TURNING-SIZE 175 ± 0.4 × 2.5 + 0.3 / -0.2 × 2680 + 20 / -0 mm FROM STEEL OF THE BRAND 16X12MVSFBR-Sh (EP823-Sh) FOR REACTORS ON FAST NEUTRONS

摘要

1. Method for the production of hexagonal billet pipes with a turnkey size of 175 ± 0.4 × 2.5 + 0.3 / -0.2 × 2680 + 20 / -0 mm from steel grade 16X12MVSFBR-Sh (EP823-Sh) for fast neutron reactors, including the casting of ingots by electroslag remelting with a size of 485 × 1540 mm, turning of ingots into billet ingots with a size of 470 × 1540 mm, drilling in billets of a central hole with a diameter of 100 ± 5 mm, heating to the plastic temperature, piercing in the mill cross-helical rolling on a mandrel with a diameter of 300 mm into sleeves with a size of 480 × internal 315 × 2400 mm with an extension µ = 1.55-1.56 and a rise in diameter δ = 2.1-2.2%, rolling of sleeves on pilgrim mills into hot-rolled billet pipes with dimensions 344 × 31 × 6600 mm on mandrels 283/287 mm in caliber 351 mm with drawing µ = 3.38, compression in diameter Δ = 28.3% and feeding of sleeves to the deformation zone m = 20 -22 mm, cutting off with a hot-cutting saw of technological waste - pilgrim heads and dummy ends, straightening pipes, cutting pipes into two cuts - workpieces with a size of 344 × 3 1 × 3300 mm, machining - boring and turning into billet pipes measuring 325 × 12 × 3300 mm with a diameter tolerance of ± 1.0% and a wall of ± 12.5%, with metal removal along the outer and inner surfaces of 9, 5 mm, rolling of billet pipes 325 × 12 mm in size on KhPT 450 and KhPT 250 mills along routes 325 × 12 × 3300 --- 273 × 8 × 5500 --- 219 × 4 × 13100 mm, cutting pipes into two edges - billets with dimensions 219 × 5 × 6550 mm, rolling of billet pipes with dimensions 219 × 4 × 6550 mm on a KhPT 250 mill into pipes with dimensions 194 × 2.5 × 11,400 mm with a diameter tolerance of ± 0.8% and a wall of ± 12.5 / -10.0%, cutting pipes into billet pipes 194 × 2.5 × 3800 mm, profiling in a roll-forming mill 400 into hexagonal billet pipes 175 × 2.5 × 3800 mm in size, trimming hexagonal tubes-blanks to measured lengths