RU2618686C1 - METHOD FOR PRODUCING SEAMLESS PIPES OF 426×8-13 mm SIZE MADE OF STEEL MARK "08Х18Н10Т-Ш" - Google Patents

METHOD FOR PRODUCING SEAMLESS PIPES OF 426×8-13 mm SIZE MADE OF STEEL MARK "08Х18Н10Т-Ш" Download PDF

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RU2618686C1
RU2618686C1 RU2016110241A RU2016110241A RU2618686C1 RU 2618686 C1 RU2618686 C1 RU 2618686C1 RU 2016110241 A RU2016110241 A RU 2016110241A RU 2016110241 A RU2016110241 A RU 2016110241A RU 2618686 C1 RU2618686 C1 RU 2618686C1
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pipes
size
diameter
rolling
blanks
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RU2016110241A
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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
    • B21B23/00Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling

Abstract

FIELD: metallurgy.
SUBSTANCE: casting the hollow ingots is carried out with electroslag remelting, boring and turning them into hollow ingot-billets, heating ingot-billets in a methodical furnace, rolling them on a pilgrim mill, and then rolling mechanically processed billets in a CRP mill into commodity pipes as described in the formula routes.
EFFECT: reducing the metal consumption, the roughness of the outer and inner surfaces, increasing the length of the pipes.
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 × 8-13 mm from steel grade 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 piercing of ingots of ESR 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 a rotation speed of working 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 Askates (second firmware) from capturing the billet sleeve to being completely on the mandrel 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 pipes are rolled on a pilgrim mill with 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 an allowance for machining 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-formed mechanically machined pipes with sizes of 245 × 19, 351 × 36, 415 × 50, 426 × 40, 426 × 50 and 436 × 45 mm from ESR ingots-blanks of 08Kh18N10T-Sh corrosion-resistant steel for objects nuclear energy 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 corrosion-resistant 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-deformed 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 of 590 ± 5.0 × 1725 ± 25 mm in size, drilling of central hole with a diameter of 100 ± 5.0 mm in ingot blanks, boring of ingot blanks to a size of 590 ± 5.0 × int. 220 ± 5 , 0 × 1750 ± 25 mm, heating ingots-blanks to temperatures plasticity bores, 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 mill of cross-helical rolling 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 redistribution pipes 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 thicknesses 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 by 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 - 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, publ. 07.27.2010, 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 conversion and machined pipes of 426 × 8-13 mm in size from steel grade 08X18H10T-Sh of increased accuracy in diameter and walls e for 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 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 v.p. 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.p. - 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 reduction coefficient 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 conversion pipe-workpieces by abrasive cleaning or grinding, the rolling of 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 B21B 21/00, 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 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 and 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 B21B 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; H = (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) - coefficient values 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 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 pipes with a size of 426 × 8-13 mm from steel grade 08X18H10T-Sh for nuclear power facilities.

The objective of the proposed method is the development of the production of seamless cold-rolled pipes with a diameter of 426 mm and a wall thickness of 8-13 mm for nuclear facilities from steel grade 08X18H10T-Sh from conversion billets of 474 × 13 × 4800-5000 and 474 × 16 × 4800-5000 mm obtained by machining - boring and turning of hot rolled tubes of 490 × 32 × 9600-10000 mm in size, rolled at 8-16 "TPU with pilgrim mills from hollow ingot blanks EShB with dimensions of 650 × ext. 460 × 3200 ± 50 mm, reduction of the expenditure coefficient of the metal during the redistribution of the hollow ingot EShP production - commodity pipe made of 08Kh18N10T-Sh corrosion-resistant steel in accordance with TU 14-3R-197-2001 for nuclear power facilities, the use of ESR for hollow ingot billets with one outer diameter of 650 mm and an increase in productivity of TPU 8-16 "at rolling conversion pipes.

The technical result is achieved by the fact that a method has been developed for the production of seamless pipes with a diameter of 426 mm and a wall thickness of 8 to 13 mm for nuclear power facilities made of 08Kh18N10T-Sh steel, including the casting of hollow ingots by electroslag remelting with a size of 670 × ext. 440 × 3200 ± 50 mm , boring and turning them into hollow ingots-blanks of size 650 × ext. 460 × 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, feeding the hollow-ingot workpieces to the upstream side Pilger mill rolling them on a pilger mill in the caliber of 498 mm with an angle transverse to release polishing portion p.vyp α = 24 -26 °, cut into rolls with a barrel diameter of 1150 mm, into conversion pipes of 490 × 32 × 9600-10000 mm in size on conical mandrels with a diameter of 428/434 mm with a drawing coefficient μ = 3.53, compression in diameter of 24.62%, with the feeding of hollow ingots-billets into the deformation zone m = 20-24 mm, the segment of technological waste - seed con Cylinders 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 a conversion pipe, heat treatment of pipes in the form of austenization, pipe cutting into two pipes of equal length, machining - boring and turning into conversion billet pipes of 474 × 13 × 4800-5000 and 474 × 16 × 4800-5000 mm in size, rolling of machined billet pipes at the KhPT 450 mill into commodity pipes along the routes: 474 × 13 × 4800 -5000 --- 426 × 8 × 8200-8600, 474 × 13 × 4800-5000 --- 426 × 9 × 7300-7650 and 474 × 13 × 48 00-5000 --- 426 × 10 × 6600-6850 mm with drawing coefficients μ, respectively, 1.79, 1.60 and 1.44; 474 × 16 × 4800-5000 --- 420 × 11 × 7400-7700, 474 × 16 × 4800-5000 --- 426 × 12 × 6750-7050 and 474 × 16 × 4800-5000 --- 426 × 13 × 6200-6500 mm with μ, 1.61, 1.48 and 1.37, respectively, heat treatment of cold-rolled pipes and their acceptance for compliance with the requirements of TU 14-3R-197-2001, mechanical processing of hot-rolled pipe in size 490 × 32 × 4800-5000 mm is produced first at a size of 474 × 16 mm, then at a size of 474 × 13 mm.

In this case, the semantic value of the characteristic characterizing the diameter of the conical mandrels is 428/434 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 pipes with a size of 426 × 8-13 mm for nuclear power facilities made of 08Kh18N10T-Sh steel differs from the known one in that hollow ingots are cast using electroslag remelting with a size of 670 × vn. 440 × 3200 ± 50 mm, boring and turning them into hollow ingots-blanks of size 650 × ext. 460 × 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, cm the azka of ingot blanks inside at both ends with a mixture of graphite with sodium chloride in a ratio of 50/50 weighing 2000-2500 g, feeding hollow ingot blanks to the inlet side of the pilgrim mill, rolling them on a pilgrim mill in caliber 498 mm with a transverse angle at the polishing section α a.s. vyp = 24-26 °, cut into rolls with a barrel diameter of 1150 mm, into conversion tubes of 490 × 32 × 9600-10000 mm in size on conical mandrels with a diameter of 428/434 mm with a drawing coefficient μ = 3.53, compression 24.62% in diameter, with the supply of hollow ingots-blanks to the deformation zone m = 20-24 mm, biological 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 length of the conversion pipe, heat treatment of pipes in the form of austenization, pipe cutting into two pipes of equal length, machining - boring and turning into conversion billets of 474 × 13 × 4800-5000 and 474 × 16 × 4800-5000 mm in size, rolling of mechanically processed pipe billets at the KhPT 450 mill into commodity pipes along the routes: 474 × 13 × 4800-5000 --- 426 × 8 × 8200-8600, 474 × 13 × 4800-5000 --- 426 × 9 × 7300-7650 and 474 × 13 × 4800-5000 --- 426 × 10 × 6600-6850 mm with drawing coefficients μ, respectively, 1 79, 1.60 and 1.44; 474 × 16 × 4800-5000 --- 420 × 11 × 7400-7700, 474 × 16 × 4800-5000 --- 426 × 12 × 6750-7050 and 474 × 16 × 4800-5000 --- 426 × 13 × 6200-6500 mm with μ, 1.61, 1.48 and 1.37, respectively, heat treatment of cold-rolled pipes and their acceptance for compliance with the requirements of TU 14-3R-197-2001, mechanical processing of hot-rolled pipe in size 490 × 32 × 4800-5000 mm is produced first at a size of 474 × 16 mm, then at a size of 474 × 13 mm.

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

A method for the production of seamless pipes with a size of 426 × 8-13 mm for nuclear facilities of their steel grade 08X18H10T-Sh was carried out at Chelyabinsk Pipe Rolling Plant OJSC at a pipe rolling plant with 8-16 "pilgrim mills when rolling conversion tubes with a size of 490 × 32 × 9800 mm from hollow ingots-blanks ESRs with a size of 650 × ext. 460 × 3200 mm, followed by boring and turning them into blanks of 474 × 16 × 4900 mm in size and rolling them at the KhPT 450 mill into commodity pipes along the route: 474 × 16 × 4900 - 426 × 12 × 6900 mm with a drawing coefficient μ = 1.48 (proposed technology). According to the existing technology, ESR ingots of 600 × 100 × 1750 mm in size were heated to ductility temperature and stitched in a cross-helical mill on a mandrel with a diameter of 275 mm with 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 out in a cross-helical mill on a mandrel with a diameter of 410 mm with μ = 1.39 and a diameter rise of δ = 1.64% into sleeves measuring 620 × ext. 425 × 2890 mm. The sleeves were rolled on 8-16 "TPU with pilgrim mills in caliber 464 mm into conversion tubes 448 × 32 × 9000 mm in size with μ = 3.83 and compression in diameter Δ = 27.74%. The conversion tubes were cut into two cuts of equal length , bored and turned into commodity pipes with a size of 426 × 12 × 4500 mm Data on the production of commercial pipes with a size of 426 × 12 mm from hollow ingot blanks EShD with a size of 650 × ext. 460 × 3200 mm of 08Kh18N10T-Sh steel (the proposed technology) and from ingots-blanks of ESR with a size of 600 × 100 × 1750 mm (existing technology) are shown 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, 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 410 mm with μ = 1.39 and a diameter rise of δ = 1.64 % in sleeves measuring 620 × ext. 425 × 2890 mm. The sleeves are rolled at 8-16 "TPU with pilgrim mills in caliber 464 mm on mandrels with a diameter of 388/392 mm with μ = 3.83 and a compression in diameter Δ = 27.74% into conversion tubes 448 × 32 × 9000 mm in size. the 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 426 × 12 × 4500 mm 6. Six pipes of 426 × 1 size were adopted in accordance with TU 14-3R-197-2001 2 × 4500 mm with a total weight of 3308 kg Consumption coefficient of metal through pipes of this batch amounted to 3.425. According to the proposed technology, 3 hollow ingot blanks ESRs with a size of 650 × ext. 460 × 3200 mm with a total weight of 12,480 kg, which were heated in a methodical furnace to a temperature of 1250-1260 ° C. After the ingot blanks were transferred from the furnace to the ingot cart, they were blown with compressed air, and then a mixture of graphite with sodium chloride in a 50/50 ratio of 2000 weight was fed from the two ends to the ingot blanks for lubrication -2500 g. Ingot blanks were supplied by crane to input side pilger mill and rolled in pilger caliber 498 mm with an angle transverse to release polishing portion p.vyp α = 24-26 °, embedded in rolls with a diameter of 1150 mm barrel, in steel making pipe size 490 × 32 × 9800 mm cone mandrels with a diameter of 428/434 mm with a drawing coefficient μ 1 = 3.53, compression in diameter of 24.62% and with the supply of hollow ingots to 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 5.5 mm. After heat treatment, the pipes were cut into two pipes of equal length. Mechanical processing - boring and turning were carried out at a size of 474 × 16 × 4900 mm. Converted machined pipes with a size of 474 × 16 × 4900 mm were transferred for rolling at the KhPT 450 mill to commodity pipes with a size of 426 × 12 × 6900 mm with a drawing coefficient μ = 1.48. In accordance with TU 14-3R-197-2001, six pipes with a size of 426 × 12 × 9000 mm (41.4 meters) with a total weight of 5.073 tons were adopted. The expenditure coefficient of the metal in the pipes of this batch was 2.460. Thus, in the production of pipes with a size of 426 × 12 mm according to the proposed technology (method), a reduction in the consumption of expensive metal per ton of pipes by 965 kg, a 1.5-fold increase in length 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 diameter of 426 mm and a wall thickness of 8-13 mm for nuclear power facilities made of 08Kh18N10T-Sh steel will reduce the cost 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 426 × 8-13 mm in size from 08Kh18N10T-Sh steel, including the casting of hollow ingots by electroslag remelting of 670 × vn. 440 × 3200 ± 50 size, boring and turning them into 650 × hollow ingots ext. 460 × 3200 ± 50, heating ingot blanks in a methodical furnace to a temperature of 1250-1260 ° C, dispensing ingot blanks from the oven to an ingot cart, blowing them with compressed air, lubricating ingot blanks inside with two ends with a mixture of graphite and cookware salt 50/50 weighing 2000-2500 g, rolling them on a pilgrim mill in a caliber of 498 mm, inserted into rolls with a barrel diameter of 1150 mm, with an angle of transverse release at the polishing section α a.s. vyp = 24-26 °, with the supply of hollow ingots-blanks to the deformation zone m = 20-24 mm, into the transfer tubes of size 490 × 32 × 9600-10000 with a compression in diameter of 24.62%, a segment 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 for the length of the conversion pipe, austenization, pipe cutting into two pipes of a different length, machining - boring and turning into conversion billet pipes with sizes: 474 × 13 × 4800-5000, 474 × 16 × 4800-5000, rolling of machined billet pipes at the KhPT 450 mill into commodity pipes along routes: 474 × 13 × 4800-5000 --- 426 × 8 × 8200-8600, 474 × 13 × 4800-5000 --- 426 × 9 × 7300-7650 and 474 × 13 × 4800-5000 --- 426 × 10 × 6600- 6850 mm with hood coefficients μ, respectively, 1.79, 1.60 and 1.44, 474 × 16 × 4800-5000 --- 426 × 11 × 7400-7700, 474 × 16 × 4800-5000 --- 426 × 12 × 6750-7050 and 474 × 16 × 4800-5000 --- 426 × 13 × 6200-6500 mm with μ, respectively, 1.61, 1.48 and 1.37, and heat treatment of cold-rolled pipes.
2. The method according to p. 1, characterized in that the hot rolled tubes of 490 × 32 × 9600-10000 mm in size are produced on a pilgrim mill on conical mandrels with a diameter of 428/434 mm, respectively, with a drawing coefficient μ = 3.53.
3. The method according to p. 1, characterized in that the machining of the hot rolled pipes of size 490 × 32 × 4800-5000 mm is produced first at a size of 474 × 16 mm, then at a size of 474 × 13.
RU2016110241A 2016-03-22 2016-03-22 METHOD FOR PRODUCING SEAMLESS PIPES OF 426×8-13 mm SIZE MADE OF STEEL MARK "08Х18Н10Т-Ш" RU2618686C1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US20090064748A1 (en) * 2006-08-14 2009-03-12 Tomio Yamakawa Process for manufacturing a seamless tube
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US20090064748A1 (en) * 2006-08-14 2009-03-12 Tomio Yamakawa Process for manufacturing a seamless tube
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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