RU2615922C1 - METHOD FOR PRODUCING SEAMLESS PIPES OF 377x8-18 mm SIZE MADE OF STEEL OF "08Х18Н10Т-Ш" GRADE - Google Patents

METHOD FOR PRODUCING SEAMLESS PIPES OF 377x8-18 mm SIZE MADE OF STEEL OF "08Х18Н10Т-Ш" GRADE Download PDF

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RU2615922C1
RU2615922C1 RU2016110210A RU2016110210A RU2615922C1 RU 2615922 C1 RU2615922 C1 RU 2615922C1 RU 2016110210 A RU2016110210 A RU 2016110210A RU 2016110210 A RU2016110210 A RU 2016110210A RU 2615922 C1 RU2615922 C1 RU 2615922C1
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pipes
size
diameter
rolling
blanks
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Анатолий Васильевич Сафьянов
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Комаров Андрей Ильич
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B21/00Pilgrim-step tube-rolling, i.e. pilger mills

Abstract

FIELD: metallurgy.
SUBSTANCE: pipes are made from hot-rolled tube stocks, obtained from hollow ingot billets of electroslag remelting, mechanically processed by boring and turning into tube stocks, which are rolled in a CRT 450 mill into trade pipes with size of 377×8-18 mm.
EFFECT: possibility of reducing the consumption coefficient of metal in the redistribution of the hollow ingot-billet ESR - trade pipe is provided by regulating the methods and modes of billets processing at all stages of production.
3 cl, 1 tbl

Description

The invention relates to pipe rolling production, and in particular to a method for the production of seamless cold-rolled pipes with a size of 377 × 8-18 mm for nuclear power facilities from steel grade 08X18H10T-Sh.

In pipe production, there is a known method for the production of commodity and conversion pipes from hardly deformable steel grades, including drilling a central hole with a diameter of 100 ± 5 mm in blanks and ingots-blanks ESR with a diameter of 380-500 mm, holding them on the grates of method furnaces at a temperature of 500-550 ° C for 70-90 min depending on the diameter, after which it is heated to a temperature of 1120-1140 ° C at a speed of 1.4-1.5 ° C / min, piercing the blanks and ingots-blanks of ESR in the cross-helical rolling mill into sleeves size in size in diameter at speed bp scheniya work rolls 25-40 rev / min on the mandrel diameter allowing for pilger reduction is at least 25 mm (RF patent №2175899, Bul. №32, 20.11.2001).

The disadvantage of this method is that it is acceptable only for the production of hot-rolled commodity and conversion pipes of medium diameter, namely pipes with a diameter of 219-325 mm, because for rolling pipes with a diameter of more than 325 mm, a blank or ingot-blank of ESR with a diameter of 540-620 mm is necessary, which, due to the low power of the drive of the cross-helical rolling mill, cannot be sewn, and most importantly, this method does not stipulate machining allowance - boring and turning of conversion pipes for the manufacture of commodity pipes of 245 × 19, 325 × 36 and 426 × 40 mm in size from corrosion-resistant steel 08X18H10T-Sh for nuclear power facilities.

In pipe production, there is a known method for the production of commodity and conversion hot-deformed pipes of large and medium diameters from corrosion-resistant hard-deformed steel grades and alloys on TPU with pilgrim mills, including drilling a central hole with a diameter of 100 ± 5 mm in ESR ingots and billets, heating them to ductility temperatures, the first flashing of ESR ingots-blanks or blanks with a diameter of 460-600 mm in a cross-helical rolling mill with a hood μ = 1.2-1.4 at a speed of rotation of the work rolls of 15-25 rpm and the second and subsequent, if necessary, rolling-up firmwares with a rise or landing in diameter of not more than 5.0% and a hood μ = 1.4-1.75 at a roll rotation speed of 20-50 rpm, using cold or hot landing the blanks into the furnace, the process of flashing from grabbing the ingots-blanks of ESR or blanks to the full position on the mandrel is carried out with a decrease in the number of revolutions of the work rolls from 25 to 15, the steady-state process of flashing at 15-20 rpm, and at the output of the blanks their rolls, the speed increases to 35-40 rpm, the firmware-rolling process and (the second firmware) from capturing the billet sleeve to being completely on the mandrel, they lead to a decrease in the number of revolutions of the work rolls from 50 to 20, the steady rolling process at 20-25 rpm, and at the exit of the sleeve from the rolls the speed is increased to 45- 50, and pipe rolling on a pilgrim mill is carried out with an extractor μ = 3.0-5.0 (RF patent No. 2247612, bull. No. 7, 03/10/2005).

The disadvantage of this method is that it is aimed at the production of commodity mechanically processed pipes and also does not stipulate an allowance for machining of conversion pipes for the manufacture of commodity mechanically processed pipes of high quality from corrosion-resistant steel 08X18H10T-Sh for nuclear power facilities.

In the pipe industry, there is a known method for the production of seamless hot-deformed machined pipes of 245 × 19, 351 × 36, 415 × 50, 426 × 40, 426 × 50 and 436 × 45 mm sizes from ESR ingots-blanks of 08Kh18N10T-Sh corrosion-resistant steel for objects nuclear energy with a bored inner and turned outer surface with a roughness of not more than R a 10 microns in accordance with GOST 2789 (TU 14-158-131-2002 "Hot-deformed pipes of high-quality corrosion-resistant steel").

The disadvantage of this method, as well as the above analogues, is that it is aimed at the production of commodity machined pipes with relatively thick walls. In the production of pipes of these sizes with a length of at least 4000 mm, the allowance for machining (boring and turning) should be at least 10 mm per side. Thus, during machining (boring and turning) with a roughness of not more than R a 10 μm, 111.5 to 227.1 kg of expensive metal, i.e. from 35.0 to 55.0% (depending on the diameter and wall thickness).

In the pipe industry, there is also a known method for producing high-quality pipes from a corrosion-resistant 08Kh18N10T-Sh brand for nuclear power facilities, which includes casting ingots by electroslag remelting, turning ingots into ingot billets, drilling in central billet ingots with a diameter of 100 ± 5 mm, heating ingot blanks up to ductility temperature, piercing ingot blanks in a cross-helical rolling mill into sleeves, rolling sleeves at TPU with pilgrim mills into hot rolled pipes, length t technological waste - pilgrim heads and seed ends with a hot cutting saw, straightening pipes, heat treatment - austenization, machining of converted hot-rolled pipes - boring and turning on machines with a follow-up system into conversion blanks with metal removal, the value of which is determined from the expressions ΔS in VS = KΔS it dry, NP = K ΔS 1 ΔS ns where ΔS ce - the quantity of metal removed layer in the bore under the process roll, mm; ΔS century - the size of the removed metal layer when boring to the finished size, mm; K = (0.5-0.6) - coefficient of reduction in the size of the removed metal layer during boring, large values of which relate to pipes of large diameters; ΔS n.p - the value of the removed metal layer during turning under the technological roll, mm; ΔS ns - the value of the removed metal layer during turning to the finished size, mm; K 1 = (0.4-0.5) is the coefficient of reduction in the size of the metal layer to be removed during turning, large values of which relate to pipes of large diameters, removal of undetected defects on conversion tubes-blanks by abrasive grinding or grinding, rolling of conversion tubes-blanks on CPT mills into commodity pipes with a roughness of the outer and inner planes of not more than R a 2.5 microns.

The disadvantage of this method is that it is aimed at the production of hot-rolled conversion tubes for each size of commodity machined and cold-rolled pipes, which in turn leads to an increase in the technological tool when rolling conversion hot-rolled pipes to TPU with pilgrim mills (mandrels of cross-helical rolling mills , rolls and mandrels of pilgrim mills). Rolling of hot-rolled chimneys for each size of commodity machined and cold-rolled pipes leads to additional transshipment at TPU with pilgrim mills and a decrease in its productivity.

The closest technical solution (prototype) is a method for the production of seamless hot-deformed long pipes with a diameter of 500 mm or more on pipe rolling plants with pilgrim mills for steam boilers, steam pipelines and manifolds of plants with high and supercritical steam parameters (patent RU No. 232322315, class B21V 19 / 04, November 27, 2007), including the casting of hollow ingots by electroslag remelting with the ratio of diameter to wall thickness D / S = K 1 , H = K 2 D and H 1 = K 3 D, where D = 680 is the outer diameter of the hollow ingot of electroslag remelting mm; S is the wall thickness of the hollow ingot of electroslag remelting, mm; K 1 = (4.8–9.2) is a coefficient whose large values are taken for hollow ingots with a smaller wall thickness; N = (3000-3500) - the height of the hollow ingot of electroslag remelting for rolling pipes with a ratio of D / S≤20, mm; K 2 = (4.4-5.2) - the values of the coefficients for rolling pipes with a ratio of D / S≤20; H 1 = (2000-2100) - the height of the hollow ingot of electroslag remelting for rolling pipes with a ratio of D / S≤20, mm; K 3 = (2.9-3.1) - values of the coefficients for rolling pipes with a ratio of D / S≥20, mm, hollow ingots of electroslag remelting for rolling boiler pipes with a ratio of D / S≥20 are cast with an inner diameter of D int = D d ± 5.0, where D d is the mandrel diameter, mm, electroslag remelting ingots for rolling boiler pipes are machined and bored into hollow ingots with metal removal of 8 ± 2.0 mm thick to remove welding slag and casting defects, hollow ingots-billets of electroslag remelting are heated to plasticity temperature and rolled they are hollowed into a pipe with a D / S≥20 ratio with a diameter tolerance of ± 1.0% and a wall thickness of + 15.0 / -10.0%, hollow ingots of electroslag remelting for rolling boiler pipes with a D / S≤ ratio 20 are cast with an internal diameter of 300 ± 10 mm, which are turned and bored into hollow ingots-blanks with metal removal with a thickness of 8 ± 2.0 mm to remove welding slag and casting defects, hollow ingots-blanks of electroslag remelting are heated to ductility temperature, stitched - roll out in a cross-rolling mill in sleeves on a mandrel with a diameter larger than the mandrel diameter are 15–20 mm and rolled on a pilgrim mill in pipes with a D / S ratio of ≤20 with a tolerance of ± 1.0% in diameter and + 15.0 / -10.0% in wall thickness.

One of the main disadvantages of this method is that it is aimed at the production of boiler pipes with a diameter of up to 550 mm and does not solve the technological issues of the production of pipes with a size of 377 × 8-18 mm from 08Kh18N10T-Sh steel for nuclear power facilities.

The objective of the proposed method is the development of the production of seamless cold-rolled pipes with a size of 377 × 8-18 mm for nuclear facilities from steel grade 08X18H10T-Sh from conversion billets of 474 × 18 × 3550-3750, 474 × 20 × 3550-3750, and 474 × 24 × 3100-3300 and 474 × 26 × 3100-3300 mm, obtained by machining - boring and turning of hot rolled tubes in the size of 490 × 38 × 7100-7500 and 498 × 43 × 6200-6600 mm, rolled on TPU 8-16 "with pilgrim mills from hollow ingots-blanks ESR size 650 × ext. 300 × 2100 ± 50 mm, reduction of the expenditure coefficient of the metal when repartitioning the floor ESH ingot billet - a commodity pipe made of corrosion-resistant steel 08X18H10T-Sh according to TU 14-3R-197-2001 for nuclear power facilities, using one size of a hollow ESHB ingot-billet for production and increasing the productivity of TPU 8-16 "during rolling conversion pipes.

The technical result is achieved through the use of a method for the production of seamless pipes with a size of 377 × 8-18 mm for nuclear power facilities made of steel grade 08X18H10T-Sh, including the casting of hollow ingots by electroslag remelting with a size of 650 × ext. 300 × 2100 ± 50, boring and turning them into ingot blanks with a size of 630 × ext. 320 × 2100 ± 50 mm, heating ingot ingots in a methodical furnace to a temperature of 1250-1260 ° C, delivery of ingot ingots from an oven, blowing with compressed air, feeding ingot ingots from two ends 1000-1250 g of lubricant in the form of a mixture of graphite with cooked salt in a ratio of 50/50, piercing-rolling of ingot billets in a cross-helical rolling mill on a mandrel with a diameter of 440 mm with a drawing coefficient μ = 1.34 and a diameter rise of δ = 3.18% in sleeves of 650 × vn size. 455 × 2750-2880 mm, rolling of sleeves on 8-16 "TPU with pilgrim mills on conical mandrels in caliber 498 mm, cut into rolls with a barrel diameter of 1150 mm, with an angle of transverse release at the polishing section α a.s. = 24-26 °, with the supply of sleeves into the deformation zone m = 20-24 mm, into the conversion pipes 490 × 38 × 7100-7500 and 498 × 43 × 6200-6600 mm in size, the waste piece - the seed ends and pilgrim heads with a hot cutting saw, dressing in a six-roll straightening machine using rolling heating temperature for 2-3 passes to a curvature of not more than 6.0 mm per length of a conversion pipe, austenization, pipe cutting into two pipes of equal length, machining boring and turning into conversion billets of 474 × 18 × 3550-3750, 474 × 20 × 3550-3750 and 474 × 24 × 3100-3300, 474 × 26 × 3100-3300 mm, rolling of mechanically processed conversion billets into KHPT 450 into cargo pipes along the routes: 474 × 18 × 3550-3750 - 426 × 13 × 5100-5400 - 377 × 8 × 8900-9500, 377 × 9 × 790 0-8400 and 377 × 10 × 7100-7500 mm with drawing coefficients μ, respectively, 1.53 1.82, 1.62 and 1.46; 474 × 20 × 3550-3750 - 426 × 16 × 4600-4800 - 377 × 11 × 7200-7500, 377 × 12 × 6600-6900 and 377 × 13 × 6000-6300 mm with drawing coefficients μ respectively 1.38, 1 63, 1.50 and 1.39; 474 × 24 × 3100-3300 - 426 × 19 × 4000-4300 - 377 × 14 × 5700-6200, 377 × 15 × 5300-5800 and 377 × 16 × 5000-5400 mm with drawing coefficients μ respectively 1.40, 1 52, 1.42 and 1.34; 474 × 26 × 3100-3300 - 426 × 22 × 3700-4000 - 377 × 17 × 5000-5500 and 377 × 18 × 4800-5200 mm with drawing coefficients μ of 1.31, 1.45 and 1.38 and thermal processing.

Hot-rolled steel tubes of 490 × 38 × 7100-7500 and 498 × 43 × 6200-6600 mm in size are rolled on a pilgrim mill on conical mandrels with a diameter of 416/422 and 406/412 mm, respectively, with drawing coefficients μ of 3.14 and 2.80 and compression by diameter of 24.62%, and the boring and turning of the converted hot-rolled cut pipes of 490 × 38 × 3550-3750 mm in size is produced first in the converted machined billet pipes of 474 × 20 × 3550-3750 mm in size, and then into billet pipes of size 474 × 18 × 3550-3750 mm, and boring and turning of pipes measuring 498 × 43 × 3100-3300 mm, respectively, into pipes for otovki size 474 × 26 × 474 × 3100-3300 and 3100-3300 × 24 mm. At the same time, the semantic meaning of the signs characterizing the diameters of the conical mandrels 416/422 and 406/412 mm should be understood as the first of the indicated diameters refers to the front section of the mandrel, and the second to its rear section.

A comparative analysis of the proposed solution with the prototype shows that the claimed method differs from the known one in that they produce casting of hollow ingots by electroslag remelting of 650 × vn. 300 × 2100 ± 50 in size, boring and turning them into ingots-blanks of 630 × vn. 320 × 2100 in size ± 50 mm, heating ingot billets in a methodical furnace to a temperature of 1250-1260 ° C, dispensing ingot billets from a furnace, blowing with compressed air, supplying ingot billets from both ends with 1000-1250 g of lubricant in the form of a mixture of graphite and cooked salt in a ratio of 50/50, firmware roll on ingot billets in a cross-helical rolling mill on a mandrel with a diameter of 440 mm with a drawing coefficient μ = 1.34 and a diameter rise of δ = 3.18% into sleeves of size 650 × ext. 455 × 2750-2880 mm, rolling the sleeves on TPU 8-16 "with pilgrim mills on conical mandrels in the caliber 498 mm, cut into rolls with a barrel diameter of 1150 mm, with an angle of transverse release at the polishing section α a.s. = 24-26 °, with the supply of sleeves into the deformation zone m = 20-24 mm, into conversion pipes of 490 × 38 × 7100-7500 and 498 × 43 × 6200-6600 mm in size, a piece of technological waste - seed ends and pilgrim heads with a saw g cutting, straightening in a six-roll straightening machine using rolling heating temperature for 2-3 passes to a curvature of not more than 6.0 mm per length of the transfer pipe, austenization, pipe cutting into two pipes of equal length, machining - boring and turning into conversion pipes - billets of 474 × 18 × 3550-3750, 474 × 20 × 3550-3750 and 474 × 24 × 3100-3300, 474 × 26 × 3100-3300 mm in size, rolling of machined conversion billets at the KhPT 450 mill into commodity pipes along the routes: 474 × 18 × 3550-3750 - 426 × 13 × 5100-5400 - 377 × 8 × 8900-9500, 377 × 9 × 7900-8400 and 377 × 10 × 7100-7500 mm with stretch coefficients μ ki respectively 1.53 1.82, 1.62 and 1.46; 474 × 20 × 3550-3750 - 426 × 16 × 4600-4800 - 377 × 11 × 7200-7500, 377 × 12 × 6600-6900 and 377 × 13 × 6000-6300 mm with drawing coefficients μ respectively 1.38, 1 63, 1.50 and 1.39; 474 × 24 × 3100-3300 - 426 × 19 × 4000-4300 - 377 × 14 × 5700-6200, 377 × 15 × 5300-5800 and 377 × 16 × 5000-5400 mm with drawing coefficients μ respectively 1.40, 1 52, 1.42 and 1.34; 474 × 26 × 3100-3300 - 426 × 22 × 3700-4000 - 377 × 17 × 5000-5500 and 377 × 18 × 4800-5200 mm with drawing coefficients μ of 1.31, 1.45 and 1.38 and thermal processing and accepting them for compliance with the requirements of TU 14-3R-197-2001, and the hot-rolled chimneys of 490 × 38 × 7100-7500 and 498 × 43 × 6200-6600 mm in size are rolled on a pilgrim mill on conical mandrels with diameters of 416/422 and 406/412 mm with drawing coefficients μ of 3.14 and 2.80, respectively, and a compression of 24.62% in diameter, and the boring and turning of the converted hot-rolled cut pipes measuring 490 × 38 × 3550-3750 mm are first produced in the conversion machined billet pipes with a size of 474 × 20 × 3550-3750 mm, then into billet pipes of a size of 474 × 18 × 3550-3750 mm, and boring and turning of pipes with a size of 498 × 43 × 3100-3300 mm, respectively, into billet pipes of a size 474 × 26 × 3100-3300 and 474 × 24 × 3100-3300 mm.

Thus, these differences allow us to conclude that the criterion of "inventive step" is met.

The method was tested at the Chelyabinsk Tube Rolling Plant OJSC on a tube-rolling installation with 8-16 "pilgrim mills when rolling redacting tubes measuring 490 × 38 × 7300 mm from hollow ingots-blanks EShP measuring 650 × in. 300 × 2100 mm from 08Kh18N10T- steel Ш followed by boring and turning them into billet pipes of 474 × 20 × 3550 mm in size and rolling them at the KhPT 450 mill into commodity pipes along the route: 474 × 20 × 3550 - 426 × 16 × 4600 - 377 × 11 × 7200 mm hoods 1.38 and 1.50, respectively, are the proposed technology. According to the existing technology, the ESR ingot billet with a size of 540 × 100 × 1750 mm is heated They were milled in a methodical furnace to the temperature of plasticity and were stitched in a cross-helical rolling mill on a mandrel with a diameter of 250 mm with a drawing coefficient μ = 1.25, the size of the outer diameter was 540 × ext. 265 × 2180 mm, which from a cold embankment, they were heated to a plasticity temperature and stitched-rolled in a cross-helical mill on a mandrel with a diameter of 350 mm with a drawing coefficient μ = 1.20 with a diameter increase of δ = 4.0% into sleeves 560 × ext. 365 × 2620 mm The sleeves were rolled on 8-16 "TPU with pilgrim mills in caliber 410 mm into conversion tubes with a size of 398 × 32 × 8500 mm with an exhaust hood μ = 3.85 and compression in diameter Δ = 28.93%. The conversion tubes were cut into two edges equal to lengths, were bored and turned into commodity pipes 377 × 12 × 4500 mm in size.The data on the technological parameters of the production of 377 × 12 mm commercial tubes from hollow ingot-blanks EShP from steel 08Kh18N10T-Sh of 650 × vn. 450 × 3200 mm in size ( the proposed technology) and from ingots-blanks ESR size 540 × 100 × 1750 mm (existing technology) listed in the table 1.

Figure 00000001

The table shows that, according to the existing technology, 3 ESR ingots-blanks with a size of 540 × 100 × 1750 mm with a total weight of 9115 kg were set into production. The ingot billets were heated in a methodical furnace to a temperature of 1250-1260 ° C, stitched in a cross-helical mill on a mandrel with a diameter of 250 mm with a hood μ = 1.25 and a diameter rise of δ = 0 in the billet blanks with a size of 540 × vn .265 × 2180 mm, which were heated from a cold embankment to a temperature of 1250-1260 ° C and stitched - rolled in a cross-helical rolling mill on a mandrel with a diameter of 350 mm with a draw ratio μ = 1.20 and a diameter rise of δ = 4, 0% in sleeves measuring 560 × ext. 365 × 2620 mm. Sleeves are rolled at 8-16 "TPU with pilgrim mills in caliber 410 mm on mandrels with a diameter of 335/341 mm with a drawing coefficient μ = 3.85 and compression in diameter Δ = 28.93% into conversion pipes with a size of 398 × 32 × 8500 mm The conversion pipes were straightened in a six-roll straightening machine and heat-treated. Since the existing equipment of ChTPZ OJSC can bore and grind conversion pipes with a length of not more than 6000 mm, the conversion pipes were cut into two pipes of equal length, bored and turned into commodity pipes size 377 × 12 × 4500 mm. Adopted in accordance with TU 14-3R-197-2001 six pipes with a size of 377 × 12 × 4500 mm with a total weight of 2917 kg Consumption coefficient of the metal in the pipes of this batch amounted to 3.125. According to the proposed technology, 3 hollow ingots-blanks ESRs with a size of 650 × int were set into production. 300 × 2100 mm with a total mass of 11433 kg, which were heated in a methodical furnace to a temperature of 1250-1260 ° C, were discharged from the furnace to an ingot trolley, purged with compressed air, a mixture of graphite with sodium chloride was fed from both ends into the ingots-blanks for lubrication 50 / 50 weighing 2000-2500 g, hollow ingots-blanks were fed by a crane to the inlet the side of the pilgrim mill, rolling on the pilgrim mill was carried out on conical mandrels with a diameter of 416/422 mm in a caliber of 498 mm, cut into rolls with a barrel diameter of 1150 mm, with an angle of transverse release in the polishing section α a.s. = 24-26 °, in conversion tubes with a size of 490 × 38 × 8500 mm with a drawing coefficient μ = 3.14, compression in diameter of 24.62%, with the supply of hollow ingots-blanks to the deformation zone m = 20-22 mm. Technological waste - seed ends and pilgrim heads were removed with a hot cutting saw. Pipes were ruled in a six-roll straightening machine using the rolling heating temperature for 2-3 passes to a curvature of not more than 6.0 mm per length of the conversion pipe. After heat treatment of pipes - austenization, the pipes were cut into two billet pipes of equal length, and then bored and turned into conversion billet pipes of 474 × 20 × 3650 mm in size. Machined billet pipes were rolled at the KhPT 450 mill into commodity pipes along the route: 474 × 20 × 3650 - 426 × 16 × 5250 - 377 × 11 × 7300 mm with hoods μ of 1.38 and 1.50, respectively. The requirements of TU 14-3R-197-2001 - 43.2 m of pipes with a size of 377 × 11 mm and a total weight of 3.91 tons were adopted. The expenditure coefficient of the metal for pipes of this batch was 2.924. Thus, in the production of pipes with a size of 377 × 11 mm according to the proposed technology (method), a decrease in the expenditure coefficient of expensive metal for each ton of pipes by 292 kg, an increase in length by 1.6 times, is obtained.

Using the proposed method for the production of seamless pipes with a size of 377 × 8-18 mm for nuclear power facilities made of 08Kh18N10T-Sh steel will significantly reduce the consumption of expensive metal, reduce the roughness of the outer and inner surfaces of the pipes, increase the productivity of TPU 8-16 ", increase the length of the pipes, and, therefore, reduce their cost.

Claims (3)

1. Method for the production of seamless pipes with a size of 377 × 8-18 mm for nuclear power facilities made of 08Kh18N10T-Sh steel, including the casting of hollow ingots by electroslag remelting with a size of 650 × int. 300 × 2100 ± 50, boring and turning them into ingot blanks of size 630 × ext. 320 × 2100 ± 50 mm, heating the ingot blanks in the methodical furnace to a temperature of 1250-1260 ° C, dispensing the ingot blanks from the furnace, blowing with compressed air, feeding the ingot blanks from both ends at 1000-1250 g each lubricants in the form of a mixture of graphite with table salt in a ratio of 50/50, firmware rolling of ingots a shear in a cross-helical rolling mill on a mandrel with a diameter of 440 mm with a drawing coefficient μ = 1.34 and a diameter rise of δ = 3.18% into sleeves of size 650 × ext. 455 × 2750-2880 mm, rolling the sleeves on TPU 8- 16 "with pilgrim mills on conical mandrels in caliber 498 mm, cut into rolls with a barrel diameter of 1150 mm, with an angle of transverse outlet at the polishing section α a.s. vyp = 24-26 °, with the supply of sleeves into the deformation zone m = 20-24 mm, into conversion pipes of 490 × 38 × 7100-7500 and 498 × 43 × 6200-6600 mm in size, a piece of technological waste - seed ends and pilgrim heads with a hot cutting saw, p Avka in a six-roll straightening machine using rolling heating temperature for 2-3 passes to a curvature of not more than 6.0 mm for the length of the conversion pipe, austenization, pipe cutting into two pipes of equal length, machining - boring and turning into billet pipes of size 474 × 18 × 3550-3750, 474 × 20 × 3550-3750 and 474 × 24 × 3100-3300, 474 × 26 × 3100-3300 mm, rolling mechanically processed conversion billets at the HPT 450 mill into commodity pipes along the routes: 474 × 18 × 3550-3750 - 426 × 13 × 5100-5400 - 377 × 8 × 8900-9500, 377 × 9 × 7900-8400 and 377 × 10 × 7100-7500 mm with drawing coefficients μ, respectively enno 1.53 1.82, 1.62 and 1.46; 474 × 20 × 3550-3750 - 426 × 16 × 4600-4800 - 377 × 11 × 7200-7500, 377 × 12 × 6600-6900 and 377 × 13 × 6000-6300 mm with drawing coefficients μ respectively 1.38, 1 63, 1.50 and 1.39; 474 × 24 × 3100-3300 - 426 × 19 × 4000-4300 - 377 × 14 × 5700-6200, 377 × 15 × 5300-5800 and 377 × 16 × 5000-5400 mm with drawing coefficients μ respectively 1.40, 1 52, 1.42 and 1.34; 474 × 26 × 3100-3300 - 426 × 22 × 3700-4000 - 377 × 17 × 5000-5500 and 377 × 18 × 4800-5200 mm with drawing coefficients μ of 1.31, 1.45 and 1.38 and thermal processing.
2. The method according to p. 1, characterized in that the hot rolled steel tubes of 490 × 38 × 7100-7500 and 498 × 43 × 6200-6600 mm in size are rolled on a pilgrim mill on conical mandrels with diameters of 416/422 and 406/412 mm, respectively extraction coefficients μ, respectively, 3.14 and 2.80 and compression in diameter of 24.62%.
3. The method according to p. 1, characterized in that the boring and turning of the converted hot-rolled cut pipes of 490 × 38 × 3550-3750 mm in size is first produced in the converted machined billet pipes of 474 × 20 × 3550-3750 mm in size, and then into the pipes - workpieces with a size of 474 × 18 × 3550-3750 mm, and boring and turning of pipes with a size of 498 × 43 × 3100-3300 mm, respectively, into pipe blanks with a size of 474 × 26 × 3100-3300 and 474 × 24 × 3100-3300 mm.
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Citations (4)

* Cited by examiner, † Cited by third party
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US4641513A (en) * 1983-08-01 1987-02-10 Vallourec Cold rolling process for tubes, by means of a Pilger rolling mill and the rolling mill for its execution
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RU2322315C2 (en) * 2006-05-22 2008-04-20 ОАО "Челябинский трубопрокатный завод" Method for producing in tube rolling plants with pilger mills seamless hot-deformed elongated tubes for steam boilers, steam conduits and manifolds of plants with high and super-critical parameters of steam
RU2401169C2 (en) * 2008-04-18 2010-10-10 ОАО "Челябинский трубопрокатный завод" Method of producing high-quality pipes from antirust steel 08x18h10t-"+" for nuclear power engineering structures

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US4641513A (en) * 1983-08-01 1987-02-10 Vallourec Cold rolling process for tubes, by means of a Pilger rolling mill and the rolling mill for its execution
RU2175899C2 (en) * 1999-09-23 2001-11-20 Открытое акционерное общество "Челябинский трубопрокатный завод" Method for making tubes of hard-to-form kinds of steel
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RU2401169C2 (en) * 2008-04-18 2010-10-10 ОАО "Челябинский трубопрокатный завод" Method of producing high-quality pipes from antirust steel 08x18h10t-"+" for nuclear power engineering structures

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