RU2642998C1 - Method of production of seamless cold-formed pipes 08h18n10t-sh of size 426x14-19 mm - Google Patents

Method of production of seamless cold-formed pipes 08h18n10t-sh of size 426x14-19 mm Download PDF

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RU2642998C1
RU2642998C1 RU2017109108A RU2017109108A RU2642998C1 RU 2642998 C1 RU2642998 C1 RU 2642998C1 RU 2017109108 A RU2017109108 A RU 2017109108A RU 2017109108 A RU2017109108 A RU 2017109108A RU 2642998 C1 RU2642998 C1 RU 2642998C1
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pipes
size
diameter
rolling
blanks
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RU2017109108A
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Russian (ru)
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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
    • 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: pipe rolling production.
SUBSTANCE: invention relates to pipe rolling production, namely to a method for producing seamless cold-deformed pipes of 426×14-19 mm size of steel grade 08H18N10T-SH. Method includes casting of hollow ingots with electroslag remelting of 670×in.430×3200±50 mm, boring and turning them into hollow ingots-billets of the size 650×in. 450×3200±50 mm, heating of ingot-billets in a methodical furnace to a temperature of 1250–1260 °C, rolling them on a pilgrim mill into a 490×38×8400-8700 mm, austenization, cutting of pipes into two pipes of equal length, machining – boring and turning into billets-billets with dimensions: 474×19×4200-4350 and 474×22×4200-4350 mm, rolling of mechanically processed billets at the cold reducer along the routes: 474×19×4200-4350-426×14×5950-6200, 474×19×4200-4350-426×15×5500-5750 and 474×19×4200-4350-426×16×5200-5400 mm; 474×22×4200-4350-426×17×5650-5850, 474×22×4200-4350-426×18×5300-5500 and 474×22×4200-4350-426×19×5100-5250 mm and heat treating of cold-rolled pipes.
EFFECT: cost of expensive metal is reduced as well as roughness of the outer and inner surfaces.
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 426 × 14-19 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 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 a plasticity temperature , the first flashing of ESR ingots-blanks or blanks with a diameter of 460-600 mm in a cross-helical rolling mill with a drawing coefficient μ = 1.2-1.4 at the speed of rotation of the working shaft forks 15-25 rpm, and the second and subsequent if necessary firmware - rolling with a rise or landing in diameter of not more than 5.0% and μ = 1.4-1.75 at a roll rotation speed of 20-50 rpm, using cold or hot insert of shell blanks into the furnace, the process of flashing from capturing ingots-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 steady-state flashing process at 15-20 rpm, and at the output of the sleeve blanks of their rolls, the number of revolutions is increased to 35-40 rpm, the firmware process is p rolling (the second firmware) from capturing the billet 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 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 μ = 3.0-5.0 (RF patent No. 22427612, publ. 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 08X18H10T-Ш stainless steel for nuclear power facilities.

In the pipe industry, there is a known method for the production of seamless hot-formed mechanically machined pipes with dimensions of 245 × 19, 351 × 36, 415 × 50, 426 × 40, 426 × 50 and 436 × 45 mm from ingots-blanks of ESR of 08Kh18N10T-Sh corrosion-resistant steel for nuclear power facilities with bored inner and turned outer surfaces 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 stainless steel").

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, there is a known method 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 at 8-16 '' TPU 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 ± 25 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 tempera plasticity tours, 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 with cold or hot planting to a temperature of ductility, 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 diameter rise of δ = 5.5-6.5 %, rolling of sleeves on TPU 8-16 '' with pilgrim mills into conversion 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 fur nical processing - boring and turning, the determination of thickness values filmed metal layers in the turning and boring of the expression: Δ = D / S * K , Δ = D / S * K 1 where Δ - thickness of metal removed layer in the turning of hot tubes on 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 apply to pipes with thicker walls; K 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 (RF patent No. 2387501, 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 tubes 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 conversion and machined pipes of 426 × 14-19 mm in size from steel grade 08X18H10T-Sh of increased accuracy in diameter and walls e for nuclear facilities.

In the pipe industry, there is also known a method for producing high-quality pipes from corrosion-resistant 08Kh18N10T-Sh brand for nuclear power facilities, including casting ingots by electroslag remelting, turning the ingots into ingot ingots, drilling in ingots-blanks of a central hole with a diameter of 100 ± 5 mm, heating ingots billets to plasticity temperature, piercing ingot billets in a cross-helical rolling mill into sleeves, rolling sleeves at TPU with pilgrim mills into hot-rolled pipe sections, length t of technological waste - pilgrim heads and seed ends with a hot cutting saw, straightening 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 c.n. VS = KΔS , ΔS n.p. = K 1 ΔS n.s. where ΔS v.p. - the value of the removed metal layer when boring under the technological roll, mm; ΔS V.S. - 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.n. - the value of the removed metal layer during turning under the technological roll, mm; ΔS n.s. - 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 HPT mills on a commodity pipe roughness outer and inner surfaces no more than R a 2,5 micron (RF patent №2401169, cl. V21V 21/00, 10.10.2010, Bul. №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 number of technological tools when rolling conversion hot-rolled pipes to TPU with pilgrim mills (mandrels - screw rolling, 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) - the 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, cast with an inner diameter of D ext. = 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-blanks of electroslag remelting are heated to the temperature of plasticity and rolled on a pilgrim mill into pipes with a ratio D / S≥20 with a tolerance of ± 1.0% in diameter and wall thickness + 15.0 / -10.0%, hollow ingots electroslag remelting for rolling boiler pipes with a ratio D / S≤20 cast wagons with an inner 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 - They are rolled in a cross-helical rolling mill into 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 a wall thickness of +15.0 / -10.0%.

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 commodity pipes of 426 × 14-19 mm in size from steel grade 08X18H10T-Sh for nuclear power facilities.

The objective of the proposed method is the development of the production of seamless cold-deformed pipes with a diameter of 426 mm and a wall thickness of 14 to 19 mm for nuclear power facilities made of 08Kh18N10T-Sh steel from conversion billets of 474 × 19 × 4200-4350 and 474 × 22 × 4200- 4350 mm obtained by machining - boring and turning of hot rolled steel tubes of 490 × 38 × 8400-8700 mm in size, rolled at 8-16 '' TPU with pilgrim mills from hollow ingot blanks ESR with a size of 650 × ext. 450 × 3200 ± 50 mm, reduction in the expenditure coefficient of the metal when redistributing ESH cast ingot-billet - commodity cold-rolled pipe made of 08Kh18N10T-Sh corrosion-resistant steel according to TU 14-3R-197-2001 for nuclear power facilities, using ESW hollow ingots-blanks of 650 × ext. 450 × 3200 ± 50 mm size for their production and increase in productivity of TPU 8-16 '' during rolling of conversion pipes.

The technical result is achieved by the fact that in the known method for the production of seamless cold-deformed pipes of size 426 × 14-19 mm from steel grade 08X18H10T-Sh for nuclear power facilities, including the casting of hollow ingots by electroslag remelting with a size of 670 × ext. 230 × 3200 ± 50 mm, a bore and turning them into hollow ingots-blanks of size 650 × ext. 450 × 3200 ± 50 mm, heating ingots-blanks in a methodical furnace to a temperature of 1250-1260 ° С, delivery of ingot-blanks from the furnace to an ingot cart, blowing them with compressed air, lubrication of ingot blanks inside with two ontsov mixture of graphite with sodium chloride in a weight ratio of 50/50 2000-2500 g, rolling them on a pilger mill in the caliber of 498 mm, embedded in rolls with a diameter of barrel 1150 mm, with an angle transverse to release polishing portion p.vyp α. = 24-26 °, with the supply of hollow ingots-billets into the deformation zone m = 20-24 mm, into conversion pipes of 490 × 38 × 8400-8700 mm in size with a compression of 24.62% in diameter, 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 a curvature of not more than 6.0 mm per length of the conversion pipe, austenization, pipe cutting into two pipes of equal length, machining - boring and turning into conversion billet pipes with dimensions: 474 × 19 × 4200-4350 and 474 × 22 × 4200-4350 mm, rolling of machined blanks at the KhPT mill into commodity pipes along the routes: 474 × 19 × 4200-4350-426 × 14 × 5950-6200, 474 × 19 × 4200-4350-426 × 15 × 5500-5750 and 474 × 19 × 4200-4350-426 × 16 × 5200-5400 mm with drawing coefficients μ of 1.50, 1.40 and 1.32, respectively; 474 × 22 × 4200-4350-426 × 17 × 5650-5850, 474 × 22 × 4200-4350-426 × 18 × 5300-5500 and 474 × 22 × 4200-4350-426 × 19 × 5100-5250 mm with coefficients hoods μ of 1.43, 1.35 and 1.29, respectively, and heat treatment of cold-rolled pipes, hot-rolled steel tubes of 490 × 38 × 8400-8700 mm in size are produced on a pilgrim mill on conical mandrels with a diameter of 416/422 mm with hood coefficients μ = 3 , 14, and the machining of hot rolled pig tubes measuring 490 × 38 × 4200-4350 mm is first carried out at a size of 474 × 22 mm, and then at a size of 474 × 19 mm.

At the same time, the semantic value of the characteristic characterizing the diameter of the conical mandrels is 416/422 mm, it should be understood how the first of the indicated diameter values 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 for the production of seamless cold-deformed pipes with a size of 426 × 14-19 mm from steel grade 08X18H10T-Sh for nuclear power facilities differs from the known one in that hollow ingots are cast using electroslag remelting with a size of 670 × ext. 430 × 3200 ± 50 mm, boring and turning them into hollow ingots-blanks with a size of 650 × ext. 450 × 3200 ± 50 mm, heating ingots-blanks in a methodical furnace to a temperature of 1250-1260 ° С, delivery of ingot-blanks from the furnace to an ingot trolley using compressed air, lubricating ingot blanks inside at both ends with a mixture of graphite and sodium chloride in a ratio of 50/50 weighing 2000-2500 g, rolling them on a pilgrim mill 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 °, with the supply of hollow ingots-billets into the deformation zone m = 20-24 mm, into conversion pipes of 490 × 38 × 8400-8700 mm in size with a compression of 24.62% in diameter, 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 a curvature of not more than 6.0 mm per length of the conversion pipe, austenization, pipe cutting into two pipes of equal length, machining - boring and turning into conversion billet pipes with dimensions: 474 × 19 × 4200-4350 and 474 × 22 × 4200-4350 mm, rolling of machined blanks at the KhPT mill into commodity pipes along the routes: 474 × 19 × 4200-4350-426 × 14 × 5950-6200, 474 × 19 × 4200-4350-426 × 15 × 5500-5750 and 474 × 19 × 4200-4350-426 × 16 × 5200-5400 mm with drawing coefficients μ of 1.50, 1.40 and 1.32, respectively; 474 × 22 × 4200-4350-426 × 17 × 5650-5850, 474 × 22 × 4200-4350-426 × 18 × 5300-5500 and 474 × 22 × 4200-4350-426 × 19 × 5100-5250 mm with coefficients hoods μ of 1.43, 1.35 and 1.29, respectively, and heat treatment of cold-rolled pipes, hot-rolled steel tubes of 490 × 38 × 8400-8700 mm in size are produced on a pilgrim mill on conical mandrels with a diameter of 416/422 mm with hood coefficients μ = 3 , 14, the machining of hot rolled steel tubes with a size of 490 × 38 × 4200-4350 mm is carried out first at a size of 474 × 22 mm, and then at a size of 474 × 19 mm. Thus, these differences allow us to conclude that the criterion of "inventive step" is met.

A method for the production of seamless cold-deformed pipes with a size of 426 × 16 mm from 08Kh18N10T-Sh steel for nuclear power facilities was carried out at a pipe rolling plant with 8-16 '' pilgrim mills when rolling pig tubes with a size of 490 × 38 × 8550 mm from hollow-core ESR ingots 650 × ext. 450 × 3200 mm, followed by boring and turning them into billet pipes of 474 × 19 × 4275 mm in size and rolling them at the KhPT 450 mill into commodity pipes along the route: 474 × 19 × 4275-426 × 16 × 5300 mm with an extraction coefficient μ = 1.32 (proposed technology). According to the existing technology, EAW ingot billets of 600 × 100 × 1750 mm in size were heated to ductility temperature and sewn in a cross-screw mill on a mandrel with a diameter of 275 mm with μ = 1.19 and a diameter rise of δ = 1.67 into the billet sleeves 610 × in. 290 × 2080 mm in size, which were heated from a cold embankment to a ductility temperature and stitched - rolled out in a helical mill on a mandrel with a diameter of 390 mm with μ = 1.20 and a diameter rise of δ = 1.64% in sleeves measuring 620 × ext. 405 × 2500 mm. The sleeves were rolled on 8-16 '' TPU with pilgrim mills in caliber 464 mm into conversion tubes 448 × 38 × 8000 mm in size with a drawing coefficient μ = 3.73 and compression in diameter Δ = 27.74%. Conveyor pipes were cut into two slots of equal length, bored and turned into commodity pipes measuring 426 × 16 × 4000 mm. Data on the production of commodity pipes of 426 × 16 mm in size from ESW hollow ingots-blanks of 650 × in. 450 × 3200 mm steel grade 08X18H10T-Sh grade (proposed technology) and from ESR ingots-blanks of 600 × 100 × 1750 mm in size (existing technology ) are given in table 1.

Data on the production of commodity pipes of 426 × 16 mm in size from ESW hollow ingots-blanks of 650 × in. 450 × 3200 mm steel grade 08Kh18N10T steel (proposed technology) and from ESR ingots-blanks of 600 × 100 × 1750 mm in size (existing technology)

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, sewn in a cross-helical rolling mill on a mandrel with a diameter of 275 mm with μ = 1.19 and a diameter rise of δ = 1.67 in the billet blanks with a size of 610 × ext. 190 × 2080 mm, which were heated to a temperature of 1250-1260 ° C from a cold embankment and stitched - rolled out in a helical rolling mill on a mandrel with a diameter of 390 mm with μ = 1.20 and a diameter rise of δ = 1.64 % in sleeves measuring 620 × ext. 405 × 2500 mm. The liners were rolled at 8-16 '' TPU with pilgrim mills in caliber 464 mm on mandrels with a diameter of 371/377 mm with μ = 3.73 and compression in diameter Δ = 27.74% into conversion tubes 448 × 38 × 8000 mm in size. Conversion pipes were straightened on a six-roll straightening machine and heat-treated. Since it is possible to bore and grind pipes with a length of not more than 6000 mm on the existing equipment of ChTPZ OJSC, the conversion pipes were cut into two pipes of equal length, bored and turned into commodity pipes of 426 × 16 × 4000 mm in size. In accordance with TU 14-3R-197-2001, six pipes with a size of 426 × 16 × 4000 mm with a total weight of 3881 kg were adopted. The expenditure coefficient of the metal in the pipes of this batch was 2.919.

According to the proposed technology, 3 hollow ESR ingots-blanks with a size of 650 × ext. 450 × 3200 mm with a total weight of 13015 kg, which were heated in a method furnace to a temperature of 1250-1260 ° C, were set into production. After delivery of the ingot blanks from the furnace to the ingot trolley, they were blown with compressed air, and then a mixture of graphite and sodium chloride in a ratio of 50/50 weighing 2000-2500 was fed from the ends into the ingot blanks for lubrication. The ingot blanks were fed by crane to piligimovogo upstream side rolling mill and rolled in pilger caliber 498 mm with the angle of the cross section of manufacture on a polishing α p.vyp. = 24-26 °, cut into rolls with a barrel diameter of 1150 mm, into conversion pipes of 490 × 38 × 8550 mm in size on conical mandrels with a diameter of 416/422 mm with a drawing coefficient μ 1 = 3.14, compression in diameter of 24.62% and with the feeding of hollow ingots-blanks into the deformation zone m = 20-24 mm. Cutting off technological waste - seed ends and pilgrim heads was done with a hot cutting saw. The dressing tubes were straightened 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 dressing tube (the pipe curvature was determined visually). After cooling, the pipe curvature ranged from 4.0 to 5.0 mm. After heat treatment, the pipes were cut into two pipes of equal length. Mechanical processing - boring and turning were performed at a size of 474 × 19 × 4275 mm. Converted machined pipes with a size of 474 × 19 × 4275 mm were transferred for rolling at the KhPT 450 mill to commodity pipes with a size of 426 × 16 × 5300 mm with a drawing coefficient μ = 1.32. In accordance with TU 14-3R-197-2001, six pipes with a size of 426 × 16 × 4275 mm (31.8 meters) with a total weight of 5.142 tons were adopted. The expenditure coefficient of the metal for the pipes of this batch was 2.531. Thus, in the production of pipes with a size of 426 × 16 mm according to the proposed technology (method), a reduction in the consumption of expensive metal per ton of pipes by 388 kg, an increase in length by 1.3 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 cold-rolled pipes with a diameter of 426 mm and a wall thickness of 14 to 19 mm for nuclear power facilities made of 08Kh18N10T-Sh steel will reduce the consumption of expensive metal, 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 (3)

1. Method for the production of seamless cold-deformed pipes of size 426 × 14-19 mm from steel grade 08X18H10T-Sh, including the casting of hollow ingots by electroslag remelting of size 670 × ext. 130 × 3200 ± 50 mm, boring and turning them into hollow ingots-blanks of size 650 × ext. 450 × 3200 ± 50 mm, heating the ingot blanks in a methodical furnace to a temperature of 1250-1260 ° C, dispensing ingot blanks from the furnace to an ingot cart, blowing them with compressed air, lubricating the ingot blanks inside with two ends with a mixture of graphite with table salt in a ratio of 50/50 weighing 2000-2500 g, rolling them on Pilger mill to 498 mm caliber, embedded in rolls with a diameter of barrel 1150 mm, with an angle transverse to release polishing portion p.vyp α. = 24-26 °, with the supply of hollow ingots-billets into the deformation zone m = 20-24 mm, into conversion pipes of 490 × 38 × 8400-8700 mm in size with a compression of 24.62% in diameter, 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 a curvature of not more than 6.0 mm per length of the conversion pipe, austenization, pipe cutting into two pipes of equal length, machining - boring and turning into conversion billet pipes with dimensions: 474 × 19 × 4200-4350 and 474 × 22 × 4200-4350 mm, rolling of machined billet pipes at the HPT mill along the routes: 474 × 19 × 4200-4350-426 × 14 × 5950-6200, 474 × 19 × 4200-4350-426 × 15 × 5500-5750 and 474 × 19 × 4200-4350-426 × 16 × 5200-5400 mm with drawing coefficients μ of 1.50, 1.40 and 1.32, respectively; 474 × 22 × 4200-4350-426 × 17 × 5650-5850, 474 × 22 × 4200-4350-426 × 18 × 5300-5500 and 474 × 22 × 4200-4350-426 × 19 × 5100-5250 mm with coefficients hoods μ, respectively 1.43, 1.35 and 1.29; and heat treatment of cold-rolled pipes.
2. The method according to p. 1, characterized in that the hot rolled tubes of size 490 × 38 × 8400-8700 mm are produced in a pilgrim mill on conical mandrels with a diameter of 416/422 mm with drawing coefficients μ = 3.14.
3. The method according to p. 1, characterized in that the machining of the hot rolled pipe size 490 × 38 × 4200-4350 mm is produced first at a size of 474 × 22 mm, and then at a size of 474 × 19 mm.
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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
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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
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* Cited by examiner, † Cited by third party
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DE3717165C1 (en) * 1987-03-26 1988-03-31 Mannesmann Ag Method for the production of tubes by the cold reciprocating rolling method
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
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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
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