RU2620203C1 - METHOD OF MANUFACTURING SEAMLESS PIPES OF SIZE 426 × 14-16 mm FOR NUCLEAR POWER FACILITIES OF STEEL OF "08Х18Н10-Ш" GRADE - Google Patents

METHOD OF MANUFACTURING SEAMLESS PIPES OF SIZE 426 × 14-16 mm FOR NUCLEAR POWER FACILITIES OF STEEL OF "08Х18Н10-Ш" GRADE Download PDF

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RU2620203C1
RU2620203C1 RU2016110251A RU2016110251A RU2620203C1 RU 2620203 C1 RU2620203 C1 RU 2620203C1 RU 2016110251 A RU2016110251 A RU 2016110251A RU 2016110251 A RU2016110251 A RU 2016110251A RU 2620203 C1 RU2620203 C1 RU 2620203C1
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pipes
rolling
size
diameter
blanks
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RU2016110251A
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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
    • B21B19/00Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling Diescher mills, Stiefel disc piercers, Stiefel rotary piercers
    • B21B19/06Rolling hollow basic material, e.g. Assel mills

Abstract

FIELD: metallurgy.
SUBSTANCE: invention relates to a method of producing seamless pipes of 426×14-16 mm for nuclear power facilities of steel grade "08Х18Н10-Ш". The method includes casting of hollow ingots with electroslag remelting of 670×in.280×2100±50 mm, boring and turning them into hollow cakes with 650×in.300×2100±50 mm, heating ingot-blanks in the process furnace to a temperature of 1250-1260°C, the issuance of ingot-blanks from the furnace, lubrication from two ends of ingot-blanks with a mixture of graphite and common salt in a ratio of 50/50 mass equal to 1000-1250 g, piercing-rolling of ingot-blanks in the mill of cross-screw rolling into sleeves of size 660×in.455×2930-3070 mm, rolling of bushings on PPP 8-16" with pilgrim mills into hot-rolled pipes of 490×38×7800-8200 mm, cutting of technological waste - seeding ends and pilgrim heads with a hot cutting saw, straightening in a six-high straight machine, austenization, cutting pipes into two pipes of equal length, machining-boring and turning into billets of 474×19×3900-4100 mm, rolling mechanically processed billets at the CPT 450 mill into commodity pipes along the routes: 474×19×3900-4100 - 426×14×5600-5900, 474×19×3900-4100 - 426×15×5200-5500 and 474×19×3900-4100 - 426×16×4900-5200 mm and heat treatment of cold-rolled pipes.
EFFECT: reduced metal consumption.
1 tbl

Description

The invention relates to pipe production, and in particular to a method for the production of seamless cold-rolled pipes with a size of 426 × 14-16 mm for nuclear power facilities from steel grade 08X18H10-Sh and can be used on TPU 8-16 "with pilgrim mills in the manufacture of hot rolled hot-rolled pipes 490 × 38 × 7800-8200 mm from hollow ingots-blanks of electroslag remelting with a size of 650 × ext. 300 × 2100 ± 50 mm for subsequent machining-boring and turning them into conversion tubes-blanks with a size of 474 × 19 × 3900-4100 mm and rolling them on the camp of HP 450 trademarks tube size 426 × 14-16 mm.

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-billets or billets with a diameter of 460-600 mm in a cross-helical rolling mill with a drawing coefficient μ = 1.2-1.4 at a rotation speed of working forks 15-25 rpm, and the second and subsequent, if necessary, rolling-rolling with lifting or landing in diameter of not more than 5.0% and a drawing coefficient μ = 1.4-1.75 at a roll rotation speed of 20-50 rpm min using cold or hot insert of shell blanks into the furnace, the process of flashing from capture of ingot blanks of ESR or blanks to their 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 established process of flashing at 15-20 rpm and at the exit of the sleeve blanks of their rolls, the number of revolutions is increased to 35-40 rpm , the firmware-rolling process (second firmware) from capturing the blank sleeve to being completely on the mandrel is carried out with a decrease in the number of revolutions of the work rolls from 50 to 20, the steady rolling process at 20-25 rpm, and the number of revolutions at the exit of the sleeve from the rolls increase to 45-50, and pipe rolling on a pilgrim mill is carried out with an extract of μ = 3.0-5.0 (RF patent No. 22427612, 03/10/2005, Bull. No. 7).

The disadvantage of this method is that it is aimed at the production of commodity mechanically processed pipes and does not stipulate the allowance for machining of conversion pipes for the manufacture of commodity mechanically processed pipes of high quality from corrosion-resistant steel 08X18H10-Sh for nuclear power facilities.

In the pipe industry, a method is known for the production of seamless hot-formed mechanically machined pipes of 245 × 19, 351 × 36, 415 × 50, 426 × 40, 426 × 50 and 436 × 45 mm sizes from ESR ingots-blanks of 08X18H10T-Sh corrosion-resistant steel for nuclear power facilities 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 made of corrosion-resistant steel of high quality").

The disadvantage of this method 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, a method is known for the production of seamless hot-formed mechanically machined pipes with a diameter of 530-550 mm from corrosion-resistant hard-deformed steel grades and alloys on TPU 8-16 "with pilgrim mills, including casting ESR ingots 610 × 1725 ± 25 mm in size, machining turning of ingots into ingot blanks with a size of 590 ± 5.0 × 1725 mm, drilling in ingot blanks of a central hole with a diameter of 100 ± 5.0 mm, boring of ingot blanks to a size of 590 ± 5.0 × int. 220 ± 5.0 × 1750 ± 25 mm, heating ingot blanks to temperature ductility, piercing in a cross-helical rolling mill into billet sleeves measuring 620 × ext. 365 × 1950-2000 mm on a mandrel with a diameter of 350 mm with a diameter rise of δ = 4.0-6.0%, heating of the billets from cold or hot-rolled to plasticity temperature, firmware-rolling in a cross-helical rolling mill into sleeves of size 660 × 505-515 × 2950-3100 mm on a mandrel with a diameter of 490-500 mm with a rise in diameter of δ = 5.5-6.5% , rolling of sleeves on TPU 8-16 "with pilgrim mills into pig tubes with a diameter of 530-550 mm with a ratio D / S = 13.5-15.0 with an allowance for wall thickness under the mechanical processing, boring and turning, determining the thickness values of the metal layers to be removed during turning and boring from the expressions Δ = D / S * K, Δ 1 = D / S * K 1 , where Δ is the thickness of the metal layer to be removed when turning hot rolled pipes along the outer surface, mm; Δ 1 - the thickness of the removed metal layer when boring hot rolled pipes on the inner surface, mm; D is the outer diameter of the hot rolled pipes, mm; S is the wall thickness of the hot rolled pipes, mm; K = 0.5-0.7 - coefficient for determining the thickness of the removed metal layer when turning pipes, large values of which relate to pipes with thicker walls; To 1 = 0.4-0.5 is a coefficient for determining the thickness of the removed metal layer when boring pipes, large values of which relate to pipes with thicker walls (Patent No. 2387501, publ. July 27, 2010. Bull. No. 12).

The disadvantage of this method is that it solves the general issues of the production of seamless hot-deformed pipes from corrosion-resistant hard-deformed steel grades and alloys with a ratio of D / S = 13.5-15.0 for subsequent machining-boring and turning them into commodity pipes with a diameter of 530 -550 mm with a wall thickness of more than 20 mm, a length of not more than 4700 mm and does not solve the technological issues of the production of limit machined pipes with a size of 474 × 19 × 3900-4100 mm for their subsequent rolling on a cold mill 450 Rolled tubes size 426 × 14-16 mm of steel 08H18N10-W high accuracy by the diameter and the wall of the nuclear power facilities.

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 of pipes, heat treatment - austenization, machining of 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 ce = KΔS v.c, 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) is the 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 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, the large values of which relate to pipes of large diameters, the removal of undetected defects on the conversion pipe-workpieces by abrasive cleaning or grinding, the rolling of the conversion pipe-workpieces onto CPT mills into commercial pipes with a roughness of the outer and inner planes of not more than R a 2.5 μm (RF patent No. 2401169, CL 21/21, 10/10/2010, Bull. No. 28).

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 casting of hollow ingots by electroslag remelting with a 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 ± 5.0, where 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, electroslag remelted hollow ingots are heated to ductility and proc melt on a pilgrim mill in pipes with a ratio D / S≥20 with a tolerance of ± 1.0% in diameter and a wall thickness of + 15.0 / -10.0%, hollow ingots of electroslag remelting for rolling boiler pipes with a D / S ratio of ≤ 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 by 15-20 mm and rolled on a pilgrim mill in pipes with a ratio D / S≤20 with a tolerance of ± 1.0% in diameter and + 15.0 / -10.0% in wall thickness.

One of the main disadvantages of the bottom 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 426 × 14-16 mm from steel grade 08X18H10-Sh 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 426 × 14-16 mm for nuclear power facilities made of steel grade 08X18H10-Sh from conversion billets of 474 × 19 × 3900-4100 mm in size, obtained by machining, boring and turning of the hot rolled pipes of 490 × 38 × 7800-8200 mm in size, rolled at 8-16 "TPU with pilgrim mills from hollow ingot-blanks EShBs of size 650 × ext. 300 × 2100 ± 50 mm, reduction of the expenditure coefficient of metal during redistribution hollow ingot-blank EShP - commodity pipe from corro ion-resistant steel 08H18N10-WB-TU 14-3R 197-2001 for nuclear power plants, the use for the production of mother tubes of one size hollow-ingot billets and productivity TPU 8-16 "during rolling of mother tubes.

The technical result is achieved through the development of a method for the production of seamless pipes with a size of 426 × 14-16 mm for nuclear power facilities from steel grade 08X18H10-Sh, including the casting of hollow ingots by electroslag remelting with a size of 670 × ext. 280 × 2100 ± 50 mm, boring and turning them into hollow ingots-blanks with a size of 650 × ext. 300 × 2100 ± 50 mm, heating ingots-blanks in a methodical furnace to a temperature of 1250-1260 ° С, delivery of ingot-blanks from the furnace, lubrication from two ends of ingots-blanks with a mixture of graphite and cooked salt in a ratio of 50/50 mass = 1000-1250 g, firmware-p rolling of ingot billets in a cross-helical rolling mill on a mandrel with a diameter of 440 mm with a drawing coefficient μ = 1.43 and a diameter rise of δ = 1.54% into sleeves measuring 660 × ext. 455 × 2930-3070 mm, rolling the sleeves into TPU 8-16 "with pilgrim mills on conical mandrels with a diameter of 416/422 mm and a caliber of 498 mm, cut into rolls with a barrel diameter of 1150 mm, with an angle of transverse release on the polishing section α a.p = 24-26 ° into hot rolled pipes 490 × 38 × 7800-8200 mm in size with a drawing coefficient μ = 3.33, compression in diameter of 24.62%, with the supply of sleeves to the deformation zone m = 20-24 mm, cut technological waste - seed ends and pilgrim heads with a hot cutting saw, 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 for the total length of the pipes, heat treatment of pipes - austenization, pipe cutting into two pipes of equal length, machining-boring and turning into conversion blanks of 474 × 19 × 3900-4100 mm in size, rolling of machined blanks at the HPT 450 mill into commodity pipes along routes: 474 × 19 × 3900-4100 - 426 × 14 × 5600-5900, 474 × 19 × 3900-4100 - 426 × 15 × 5200-5500 and 474 × 19 × 3900-4100 - 426 × 16 × 4900-5200 mm with hoods μ, respectively 1.50, 1.40 and 1.32, heat treatment of cold-rolled pipes and their acceptance for compliance with the requirements TU 14-3R-197-2001.

A comparative analysis of the proposed solution with the prototype shows that the claimed method for the production of seamless pipes of 426 × 14-16 mm in size for nuclear power facilities made of 08Kh18N10-Sh steel differs from the well-known one in that hollow ingots are cast using electroslag remelting of 670 × vn. 280 × 2100 ± 50 mm, boring and turning them into hollow ingots-blanks of size 650 × ext. 300 × 2100 ± 50 mm, heating of ingot-blanks in a methodical furnace to a temperature of 1250-1260 ° С, delivery of ingot-blanks from the furnace, lubrication with of two ends of ingots-blanks with graphite mixture and with table salt in a ratio of 50/50 weight = 1000-1250 g, piercing-rolling of ingot billets in a cross-helical rolling mill on a mandrel with a diameter of 440 mm with a draw ratio μ = 1.43 and a diameter rise of δ = 1.54 % in sleeves measuring 660 × ext. 455 × 2930-3070 mm, rolling of sleeves on TPU 8-16 "with pilgrim mills on conical mandrels with a diameter of 416/422 mm in caliber 498 mm, cut into rolls with a barrel diameter of 1150 mm, with an angle lateral release in the polishing section α p vyp = 24-26 °, into hot-rolled steel tubes measuring 490 × 38 × 7800-8200 mm with a drawing coefficient μ = 3.33, crimped we have a diameter of 24.62%, with the supply of sleeves into the deformation zone m = 20-24 mm, a piece of technological waste - seed ends and pilgrim heads with a hot cutting saw, straightening in a six-roll straightening machine using rolling heating temperature for 2-3 passes to curvature not more than 6.0 mm for the total length of the pipes, heat treatment of pipes - austenization, cutting of pipes into two pipes of equal length, machining, boring and turning into conversion blanks of 474 × 19 × 3900-4100 mm in size, rolling of machined pipes of preparations at the mill KhPT 45 0 to the goods pipes along the routes: 474 × 19 × 3900-4100 - 426 × 14 × 5600-5900, 474 × 19 × 3900-4100 - 426 × 15 × 5200-5500 and 474 × 19 × 3900-4100 - 426 × 16 × 4900-5200 mm with hoods μ, respectively 1.50, 1.40 and 1.32, heat treatment of cold rolled pipes and their acceptance for compliance with the requirements of TU 14-3R-197-2001.

A method for the production of seamless pipes of 426 × 14-16 mm in size for nuclear power facilities made of 08Kh18N10-Sh steel was carried out at Chelyabinsk Pipe-Rolling Plant OJSC at a pipe-rolling plant with 8-16 "pilgrim mills when rolling pig-sized pipes of 490 × 38 × 8000 mm in size from hollow ingots-blanks ESR with a size of 650 × ext. 300 × 2100 mm, followed by boring and turning them into pipe-blanks of 474 × 19 × 4000 mm in size and rolling them at the KhPT 450 mill into commodity pipes along the route: 474 × 19 × 4000 - 426 × 15 × 5350 mm with an extractor hood μ = 1.40 - the proposed technology. The parts of the ESR ingot billets 600 × 100 × 1750 mm in size were heated to the ductility temperature and stitched in a cross-helical rolling mill on a mandrel with a diameter of 275 mm with a hood μ = 1.19 and a diameter rise of δ = 1.67 into blanks of size 610 × ext. 290 × 2080 mm, which were heated from a cold embankment to a temperature of plasticity and stitched-rolled in a cross-helical mill on a mandrel with a diameter of 400 mm with a drawing coefficient μ = 1.33 and a diameter rise of δ = 1.64% in sleeves measuring 620 × ext. 415 × 2770 mm. The sleeves were rolled on 8-16 "TPU with pilgrim mills in caliber 464 mm into conversion tubes 448 × 38 × 7400 mm in size with an exhaust hood of μ = 3.41 and a compression in diameter of Δ = 27.74%. The conversion tubes were cut into two edges equal to lengths, were bored and turned into commodity pipes of 426 × 15 × 3700 mm in size.The data on technological parameters and production of commodity pipes of 426 × 15 mm in size from hollow ingot blanks EShD with a size of 650 × in. 300 × 2100 mm of steel 08Х18Н10-Ш ( proposed technology) and from ingots-blanks ESR size 600 × 100 × 1750 mm (existing technology) is given in Table 1.

Figure 00000001

The table shows that, according to the existing technology, 3 ESR ingots-blanks with a size of 600 × 100 × 1750 mm with a total weight of 11330 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 rolling mill on a mandrel with a diameter of 275 mm with a hood μ = 1.19 and a diameter rise of δ = 1.67 into billet sleeves of size 610 × ext. 190 × 2080 mm, which were heated to a temperature of 1250-1260 ° C from a cold embankment and stitched-rolled in a cross-helical rolling mill on a mandrel with a diameter of 400 mm with a hood μ = 1.33 and a diameter rise of δ = 1 , 64% in sleeves measuring 620 × ext. 415 × 2770 mm. The sleeves were rolled on 8-16 "TPU with pilgrim mills in caliber 464 mm on mandrels with a diameter of 373/379 mm with a hood μ = 3.41 and compression in diameter Δ = 27.74% into conversion tubes 448 × 38 × 7400 mm in diameter. 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 pipes no longer than 6000 mm, the conversion pipes were cut into two pipes of equal length, bored and turned into commodity pipes of size 426 × 15 × 3700 mm. Adopted in accordance with TU 14-3R-197-2001 six times measure 426 × 15 × 3700 mm with a total weight of 3374 kg Consumption coefficient of metal through pipes of this batch amounted to 3.358. According to the proposed technology, 3 hollow ingot blanks ESRs with a size of 650 × ext. 300 × 2100 mm with a total weight of 12908 kg were specified were heated in a methodical furnace to a temperature of 1250-1260 ° C. After being dispensed from the furnace into ingots-preforms for lubrication, a mixture of graphite with sodium chloride 50/50 with a mass of ≈ 1000-1250 was fed from both ends. The ingots-preforms were stitched-rolled into a cross-helical rolling mill on a mandrel with a diameter of 440 mm with an extractor μ = 1.43 lifting diameter δ = 1,54% in the size of the sleeve 660hvn.455 × 3000 mm. The sleeves were rolled on a pilgrim mill in caliber 498 mm with an angle of transverse release at the polishing section α a.s. v = 25 °, cut into rolls with a barrel diameter of 1150 mm, into conversion tubes 490 × 38 × 8000 mm in size on conical mandrels with a diameter of 416/422 mm with a hood μ 1 = 3.33, compression in diameter of 24.62% and with feeds of sleeves into the deformation zone m = 20-24 mm. Cutting off technological waste - seed ends and pilgrim heads was done with a hot cutting saw. Dressing pipes were straightened in a six-roll straightening machine using rolling heating temperature for 2-3 passes until the curvature was not more than 6.0 mm for the total length of the pipes (the pipe curvature was determined visually). After cooling, the pipe curvature ranged from 4.0 to 5.5 mm. After heat treatment, the pipes were cut into two pipes of equal length. The machining-boring and turning were performed at a size of 474 × 19 × 4000 mm. Converted machined pipes with a size of 474 × 19 × 4000 mm were transferred for rolling at the KhPT 450 mill to commodity pipes with a size of 426 × 15 × 5350 mm with an exhaust hood μ = 1.40. In accordance with TU 14-3R-197-2001, six pipes with a size of 426 × 15 × 5350 mm (32.1 m) with a total weight of 4.878 tons were adopted. The expenditure coefficient of the metal for the pipes of this batch was 2.646. Thus, in the production of pipes with a size of 426 × 16 mm according to the proposed technology (method), a decrease in the cost coefficient of expensive metal per ton of pipes by 712 kg, an increase in length by 1.45 times and a decrease in the roughness of the outer and inner surfaces of the pipes are obtained.

Using the proposed method for the production of seamless pipes with a size of 426 × 14-16 mm for nuclear facilities of steel grade 08X18H10-Sh will reduce metal consumption, reduce the roughness of the outer and inner surfaces, increase the productivity of TPU 8-16 ", increase the length of the pipes, and therefore reduce their cost.

Claims (1)

  1. A method for the production of seamless pipes of 426 × 14-16 mm in size for nuclear power facilities made of 08Kh18N10-Sh steel, including the casting of hollow ingots by electroslag remelting of 670 × ext. 280 × 2100 ± 50 mm in size, boring and turning them into hollow ingots 650 × ext. 300 × 2100 ± 50 mm, heating the ingot blanks in a methodical furnace to a temperature of 1250-1260 ° C, delivery of ingot blanks from the furnace, lubrication from both ends of the ingot blanks with a mixture of graphite with sodium chloride in a ratio of 50/50 mass = 1000-1250 g, firmware rolling of ingot blanks in a cross-screw mill rolling on a mandrel with a diameter of 440 mm with an extraction coefficient μ = 1.43 and a rise in diameter of δ = 1.54% into sleeves measuring 660 × ext. 455 × 2930-3070 mm, rolling the sleeves on TPU 8-16 "with pilgrim mills on conical mandrels with a diameter of 416/422 mm in a caliber 498 mm, cut into rolls with a barrel diameter of 1150 mm, with an angle of transverse release on the polishing section α a.s. vyp = 24-26 °, into hot-rolled pig tubes measuring 490 × 38 × 7800-8200 mm with an extraction coefficient μ = 3.33, compression in diameter of 24.62%, with the supply of sleeves into the deformation zone m = 20-24 mm, a piece of technological waste - seed ends and saws Igrim heads by hot cutting saw, 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 for the total pipe length, austenization, pipe cutting into two pipes of equal length, machining, boring and turning into conversion billets of 474 × 19 × 3900-4100 mm in size, rolling of machined billets at the KhPT 450 mill into commodity pipes along the routes: 474 × 19 × 3900-4100 - 426 × 14 × 5600-5900, 474 × 19 × 3900-4100 - 426 × 15 × 5200-5500 and 474 × 19 × 3900-4100 - 426 × 16 × 4900-5200 mm with a drawing coefficient μ, respectively but 1.50, 1.40 and 1.32 and heat treatment of cold rolled pipes.
RU2016110251A 2016-03-22 2016-03-22 METHOD OF MANUFACTURING SEAMLESS PIPES OF SIZE 426 × 14-16 mm FOR NUCLEAR POWER FACILITIES OF STEEL OF "08Х18Н10-Ш" GRADE RU2620203C1 (en)

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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
RU2387501C2 (en) * 2007-12-24 2010-04-27 ОАО "Челябинский трубопрокатный завод" FABRICATION METHOD OF SEAMLESS HOT-DEFORMED MECHANICALLY TREATED TUBES WITH DIAMETRE OF 530-550 mm FROM CORROSION-RESISTANT DIFFICULT-TO-FORM GRADES OF STEEL AND ALLOYS ON TUBE-FORMING INSTALLATION 8-16" WITH PILGER MILLS
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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US4798071A (en) * 1986-06-25 1989-01-17 Kocks Technik Gmbh & Co. Seamless tube production
RU2247612C2 (en) * 2003-05-06 2005-03-10 ОАО "Челябинский трубопрокатный завод" Method for making hot deformed and conversion mean- and large-diameter tubes of corrosion resistant hard-to-form steels and alloys in tube rolling aggregate with pilger mills
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
RU2387501C2 (en) * 2007-12-24 2010-04-27 ОАО "Челябинский трубопрокатный завод" FABRICATION METHOD OF SEAMLESS HOT-DEFORMED MECHANICALLY TREATED TUBES WITH DIAMETRE OF 530-550 mm FROM CORROSION-RESISTANT DIFFICULT-TO-FORM GRADES OF STEEL AND ALLOYS ON TUBE-FORMING INSTALLATION 8-16" WITH PILGER MILLS
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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