RU2013137966A - METHOD FOR PRODUCING COLD-ROLLED COMMODITY PIPES OF 150X2X1200 MM SIZE OF IMPROVED ACCURACY IN DIAMETER AND WALL FROM STEEL 12KH12M1FBRU-SH (EP 450U-SH) FOR NEWLY GENERATED NON-BREAKING REACTORS - Google Patents

Abstract

1. Method for the production of cold-rolled commodity pipes with a size of 150 × 2 × 1200 mm of increased accuracy in diameter and wall from steel grade 12X12M1BFRU-Sh (EP450U-Sh) for new-generation fast neutron reactors, including ingot casting by electroslag remelting of size 485 × 1540 ± 25 mm, turning ingots into ingot billets of 470 × 1540 ± 25 mm in size, drilling a central hole with a diameter of 100 ± 5 mm in ingot billets, heating to ductility temperature, piercing in a helical rolling mill on a mandrel with a diameter of 300 mm in 480хvn sleeves .315 × 2400 ± 40 mm with a rise in diameter of δ = (2.1-2.2)% and a hood µ = 1.55-1.56, rolling of sleeves on pilgrim mills into hot-deformed billet pipes of 344 × 31 × 6600 ± 100 mm in size caliber 351 mm on conical mandrels with a diameter of 283/287 mm with a hood µ = 3.28-3.29, compression in diameter Δ = (28.3-28.4)% and feeding the sleeves into the deformation zone m = 20-22 mm , a saw cut by hot cutting of technological waste - pilgrim heads and seed ends, straightening pipes, cutting pipes into two crates with a size of 3300 ± 50 mm, machining - boring and turning with metal removal along the outer and inner to surfaces of 9.5 mm into pig tubes of 325 × 12 × 3300 ± 50 mm in size with a tolerance of ± 1.0% in diameter and a wall of ± 12.5%, rolling converted hot-rolled machined tubes at cold rolling mills KhPT450 and KhPT250 into cold rolled pipes along routes 325 × 12-273 × 8-219 × 5-194 × 3.5 mm, rolling cold rolled pipes of size 194 × 3.5 mm into commodity pipes of size 150 × 2 × 1200 mm with a diameter tolerance of ± 0, 8% (± 1.2 mm) and a stack thickness of + 12.5 / -10.0% (+ 0.25 / -0.2 mm), characterized in that electroslag ingots are molten in a size of 485 × 1600 ± 25 mm grind into ingots

Claims (4)

1. Method for the production of cold-rolled commodity pipes with a size of 150 × 2 × 1200 mm of increased accuracy in diameter and wall from steel grade 12X12M1BFRU-Sh (EP450U-Sh) for new-generation fast neutron reactors, including ingot casting by electroslag remelting of size 485 × 1540 ± 25 mm, turning ingots into ingot billets of 470 × 1540 ± 25 mm in size, drilling a central hole with a diameter of 100 ± 5 mm in ingot billets, heating to ductility temperature, piercing in a helical rolling mill on a mandrel with a diameter of 300 mm in 480хvn sleeves .315 × 2400 ± 40 mm with a diameter rise of δ = (2.1-2.2)% and a hood µ _ave = 1.55-1.56, rolling of sleeves on pilgrim mills into hot-deformed billet pipes of 344 × 31 × 6600 ± 100 size mm in caliber 351 mm on conical mandrels with a diameter of 283/287 mm with a hood µ _n = 3,28-3,29, compression in diameter Δ = (28,3-28,4)% and feeding the sleeves into the deformation zone m = 20 -22 mm, a cut by a saw for hot cutting of technological waste - pilgrim heads and seed ends, straightening pipes, cutting pipes into two crates with a size of 3300 ± 50 mm, machining - boring and turning with metal removal on the outside and inside morning surfaces of 9.5 mm into pig tubes of 325 × 12 × 3300 ± 50 mm in size with a tolerance of ± 1.0% in diameter and a wall of ± 12.5%, rolling of converted hot-rolled machined pipes at cold rolling mills KhPT450 and KhPT250 into cold rolled pipes along routes 325 × 12-273 × 8-219 × 5-194 × 3.5 mm, rolling cold rolled pipes of size 194 × 3.5 mm into commodity pipes of size 150 × 2 × 1200 mm with a diameter tolerance of ± 0, 8% (± 1.2 mm) and a stack thickness of + 12.5 / -10.0% (+ 0.25 / -0.2 mm), characterized in that electroslag ingots are molten in a size of 485 × 1600 ± 25 mm grind into ingots dies of 470 × 1600 ± 25 mm in size, a through hole with a diameter of 100 ± 5 mm is drilled in ingot billets, the ingot billets are heated in a methodical furnace to a temperature of 1120–1140 ° C, stitched in a transverse helical mill in sleeves of size 480хvn.315 × 2500 ± 40 mm on a mandrel with a diameter of 300 mm with a rise in diameter of δ = 2.1-2.2% and a hood µ _ave = 1.55-1.56, the sleeves are rolled on a pilgrim mill on mandrels with a diameter of 282/286 mm a caliber of 340 mm in the steel making Hot tube size 338 × 25 × 9000 ± 200 mm stretch μ _n = 4,07-4,08, compression - posad diameter Δ = (29,5-29,6)% and fed gil h to the deformation zone m = 16-18 mm, technological waste - pilgrim heads and seed ends are removed with a hot cutting saw, pipes are straightened in a six-roll straightening machine to curvature h≤3 mm to a length of 4500 ± 100 mm, pipes are 338 × 25 × 9000 in size ± 200 mm are cut into two billet pipes of equal length, which are bored and turned into billet pipe billets of 325 × 12 × 4500 ± 100 mm in size with metal removal along the inner and outer surfaces ΔS _ext. = ΔS _n ≤6.5 mm with a surface purity of R _z ≤30 μm, with a diameter tolerance of ± 0.8% and a wall thickness of ± 10%. 2. The method according to claim 1, characterized in that the defects on the outer and inner surfaces of the converted machined pipes of size 325 × 12 mm in the form of drafts with a depth of not more than 0.5 mm, located on different surfaces with an offset relative to each other around the circumference, removed by a gentle sweep with a surface purity of R _z ≤30 μm, and the offset value is determined from the expression $$L\ge \frac{\pi d}{\mathrm{twenty}}$$

, where d is the outer diameter of the conversion pipe, mm 3. The method according to claim 1, characterized in that the converted machined pipes of 325 × 12 × 4500 ± 100 mm in size are rolled on the KhPT 450 and HPT 250 mills into commodity pipes of 150 × 2 mm in size along the routes: 325 × 12 × 4500 ± 100-273 × 8 × 7600 ± 150-219 × 5 × 14500 ± 300 mm, pipes 219 × 5 × 14500 ± 300 mm in size are cut into two billet pipes of 219 × 5 × 7250 ± 150 mm in size and rolled on an HPT 250 mill into conversion pipes 194 × 3.5 × 11300 ± 240 mm in size, pipes 194 × 3.5 × 11300 ± 240 mm in size are cut into two pipes of equal length 194 × 3.5 × 5650 ± 120 mm and rolled into commodity pipes of size 150 × 2 × 12300 ± 270 mm, which are cut into multiple comrade prefabricated pipe blanks measuring 150 × 2 × 1200 + 20 / -0 mm. 4. The method according to claim 1, characterized in that the conversion pipe size 194 × 3.5 mm is rolled on the mill KhPT 250 in the commodity size 150 × 2 mm with a diameter tolerance of ± 1.0 mm (± 0.65%) and wall ± 0.1 mm (± 5.0%).