DIMENSIONS OF 150(1200 MM WITH INCREASED ACCURACY AS TO DIAMETER AND WALL FROM STEEL GRADE "12-12¦1L+¦L-+ (¦¦ 450L-+)" FOR FAST NEUTRON REACTORS OF NEW GENERATION Russian patent published in 2015 - IPC B21B21/00 

FIELD: metallurgy.

SUBSTANCE: ingots of an electroslag remelting process (ESR) with dimensions of 485×1600±25 mm are turned to cakes with dimensions of 470×1600±25 mm; a through-type hole with a diameter of 100±5 mm is drilled, heated to the temperature of 1120-1140°C, stitched in a cross-helical rolling mill to shells with dimensions of 480×in315×2500±40 mm on a mandrel with a diameter of 300 m with rise as to diameter δ=2.1-2.2% and drawing µ_roll=1.55-1.56. Shells are rolled on the pilger mill on mandrels with a diameter of 282/286 mm in a 340 mm pass to semi-finished hot-deformed tubes with dimensions of 338×25×9000±200 mm with drawing µ_p=4.07-4.08, by swaging - setting along the diameter Δ=(29.5-29.6)% and supply of shells to deformation zone m=16-18 mm. After pilger heads and seed ends are removed, tubes are straightened in a six-roll strengthening machine, cut into two tube workpieces of equal length and turned and bored to semi-finished tube workpieces with dimensions of 325×12×4500±100 mm. Machined semi-finished tubes are rerolled on KHPT 450 and KHPT 250 mills to tubes with dimensions of 219×5×14500±300 mm, cut into two tube workpieces, rerolled to semi-finished tubes with dimensions of 194×3.5×11300±240 mm, which are cut into two tubes of equal length and rerolled to marketable tubes with dimensions of 150×2×12300±270 mm.

EFFECT: reduction of a metal consumption coefficient.

3 cl, 1 tbl