RU2615393C1 - Method of manufacturing seamless pipes of size 426×20-22 mm for nuclear power facilities of steel of "08х18н10-ш" grade - Google Patents

Method of manufacturing seamless pipes of size 426×20-22 mm for nuclear power facilities of steel of "08х18н10-ш" grade Download PDF

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RU2615393C1
RU2615393C1 RU2016110207A RU2016110207A RU2615393C1 RU 2615393 C1 RU2615393 C1 RU 2615393C1 RU 2016110207 A RU2016110207 A RU 2016110207A RU 2016110207 A RU2016110207 A RU 2016110207A RU 2615393 C1 RU2615393 C1 RU 2615393C1
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pipes
size
diameter
rolling
rolled
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RU2016110207A
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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: invention relates to production of cold-rolled seamless pipes with size 426×20-22 mm. Pipes production is carried out of stock pipe billets of 474×25×3,700-3,900 mm size obtained by mechanical processing: boring and turning of stock hot-rolled pipes of 490×42×7,400-7,800 mm size, rolled at PRM 8-16" with Pilger mills from hollow ESR ingot-billets of 650×inner. 300×2100±50 mm.
EFFECT: reduced metal consumption, reduced roughness of outer and inner pipe surfaces and increased length of pipe.
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 × 20-22 mm for nuclear 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 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, firmware rolling 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 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 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 process sewing-rolling (the second firmware) from capturing the sleeve-blank 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 number of revolutions 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, 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 ingots-blanks of size 590 ± 5.0 × 1725 mm, drilling in blanks-blanks of a central hole with a diameter of 100 ± 5.0 mm, boring of ingots-blanks to a size of 590 ± 5.0хвн. 220 ± 5.0 ± 1750 ± 25 mm, heating ingot blanks to tempera 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 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 in calibers 538 and 562 mm, cut into rolls with a barrel diameter of 1045 mm, into conversion pipes with a diameter of 530-550 m m with the ratio of D / S = 13,5-15,0 with allowance for wall thickness by machining, boring and turning, determine the thickness filmed metal layers in the turning and boring of expression 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 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 - 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. 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 limit machined pipes with a size of 474 × 25 × 3700-3900 mm for their subsequent rolling on cold steel mill 450 rolled pipes of 426 × 20-22 mm in size from steel grade 08X18H10-Sh of increased accuracy in diameter and wall 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 converted hot-rolled pipes, boring and turning, on machines with a tracking 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 to the finished size, mm; K 1 = (0.4-0.5) - 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 the conversion pipe-workpieces by abrasive grinding or grinding, rolling of the conversion pipe-workpieces on CPT mills into commodity 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 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; 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, 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 with inner diameters of 300 ± 10 mm, which are turned and bored into hollow ingots-blanks with removal of metal with a thickness of 8 ± 2.0 mm to remove welding slag and casting defects, hollow ingots-blanks of electroslag remelting are heated to the plasticity temperature, 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 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 cold-rolled pipes of 426 × 20-22 mm in size 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 × 20-22 mm for nuclear power facilities from steel grade 08X18H10-Sh from conversion tubes-blanks of 474 × 25 × 3700-3900 mm in size, obtained by machining, boring and turning of hot rolled 490 × 42 × 7400-7800 mm pipes rolled at 8-16 "TPU with pilgrim mills from ESH hollow ingots-blanks of 650 × ext. 300 × 2100 ± 50 mm in size, reduction of metal consumption coefficient during redistribution of ESW hollow ingot-blanks - 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 × 20-22 mm for nuclear 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 of size 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, supply of lubricants weighing 1000 from the inside of the two ingots-blanks -1250 g in the form of a mixture of graphite with sodium chloride, respectively 50/50, firmware rolling of ingot billets in a cross-helical rolling mill on a mandrel with a diameter of 425 mm with a draw ratio μ = 1.35 and a diameter rise of δ = 1.54% into sleeves of 660 × ext. 440 × 2760 -2900 mm, rolling of sleeves on TPU 8-16 "with pilgrim mills on conical mandrels with a diameter of 407/413 mm in caliber 498 mm, cut into rolls with a barrel diameter of 1150 mm, with an angle of transverse release at the polishing section of a . = 24-26 °, into hot-rolled steel tubes measuring 490 × 42 × 7400-7800 mm with a drawing coefficient μ = 3.22, compression in diameter of 24.62%, with the supply of sleeves to the deformation zone m = 20-24 mm, 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 equal length, machining-boring and turning into conversion pipes-workpieces 474 × 25 × 3700-3900 mm, rolling of machined pipe blanks at the KhPT 450 mill into commodity pipes along the routes: 474 × 25 × 3700-3900-426 × 20 × 4850-5400, 474 × 25 × 3700-3900- 426 × 21 × 4900-5160 and 474 × 25 × 3700-3900-426 × 22 × 4400-4700 mm with a drawing coefficient μ, respectively, 1.38, 1.32 and 1.26, heat treatment of cold-rolled pipes and their acceptance for compliance with the requirements of 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 with a size of 426 × 20-22 mm for nuclear power facilities from steel grade 08X18H10-Sh differs from the known one in that hollow ingots are cast using electroslag remelting with a size of 670 × ext. 280 × 2100 ± 50 mm, boring and turning them into hollow ingots-blanks of size 650 × ext. 300 × 2100 ± 50 mm, heating the ingots-blanks in a methodical furnace to a temperature of 1250-1260 ° С, delivery of ingots-blanks from the furnace, feeding inside ingot blanks at both ends of the grease ki weighing 1000-1250 g in the form of a mixture of graphite with table 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 425 mm with a draw ratio μ = 1.35 and a rise in diameter δ = 1.54% in sleeves measuring 660хвн. 440 × 2760-2900 mm, rolling of sleeves on TPU 8-16 "with pilgrim mills on conical mandrels with a diameter of 407/413 mm in caliber 498 mm, cut into rolls with a barrel diameter of 1150 mm, s the angle of the transverse release on the polishing section α p. vyp. = 24-26 °, into hot-rolled steel tubes measuring 490 × 42 × 7400-7800 mm with a drawing coefficient μ = 3.22, compression in diameter of 24.62%, with the supply of sleeves to the deformation zone m = 20-24 mm, 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, heat treatment of pipes - austenization, pipe cutting into two pipes equal length, machining-boring and turning in billet pipes 474 × 25 × 3700-3900 mm in size, rolling of machined pipe-blanks at the KhPT 450 mill into commodity pipes along the routes: 474 × 25 × 3700-3900-426 × 20 × 4850-5400, 474 × 25 × 3700-3900-426 × 21 × 4900-5160 and 474 × 25 × 3700-3900-426 × 22 × 4400-4700 mm with drawing coefficients μ, respectively, 1.38, 1.32 and 1.26, heat treatment of cold-rolled pipes and their acceptance for compliance with the requirements of TU 14-3R-197-2001. 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 × 20-22 mm for nuclear facilities of their steel grade 08X18H10-Sh was carried out at Chelyabinsk Pipe Rolling Plant OJSC at a pipe-rolling installation with 8-16 "pilgrim mills during rolling of conversion pipes with a size of 490 × 42 × 7600 mm from hollow ingots-blanks ESR with a size of 650 × ext. 300 × 2100 mm, followed by boring and turning them into tubes-blanks of size 474 × 25 × 3800 mm and rolling them at the mill ХПТ 450 into commodity pipes along the route: 474 × 25 × 3800 -426 × 22 × 4550 mm with an extraction coefficient μ = 1.26 - the proposed technology. With the use of technology, ingots of ECB ingots 600 × 100 × 1750 mm in size were heated to ductility temperature and sewn in a cross-helical rolling mill on a mandrel with a diameter of 275 mm with a draw ratio μ = 1.19 and a diameter rise of δ = 1.67 in the sleeves workpieces with a size of 610хвн.290 × 2080 mm, which were heated from a cold embankment to a temperature of plasticity and stitched-rolled in a cross-helical rolling mill on a mandrel with a diameter of 380 mm with a draw ratio μ = 1.24 and a diameter rise of δ = 1.64% in sleeves measuring 620 × ext. 395 × 2580 mm. The sleeves were rolled on 8-16 "TPU with pilgrim mills in caliber 464 mm into conversion tubes 448 × 44 × 6700 mm in size with an exhaust hood of μ = 3.21 and compression in diameter Δ = 27.74%. The conversion tubes were cut into two slots equal to lengths, were bored and turned into commodity pipes with a size of 426 × 22 × 3350 mm.Data on technological parameters and production of commercial pipes with a size of 426 × 22 mm from hollow ingot blanks EShD with a size of 650 × ext. 300 × 2100 mm steel 08Х18Н10-Ш ( proposed technology) and from ingots-blanks ESR size 600 × 100 × 1750 mm (existing technology) is given in Table 1.

Data on the technological parameters and production of commodity pipes of 426 × 22 mm in size from EShV hollow ingots-blanks of 650хвн.300 × 2100 mm steel grade 08Х18Н10-Ш grade (proposed technology) and from EShI ingots-blanks of 600 * 100 × 1750 mm in size 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. Billet ingots 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 drawing coefficient μ = 1.19 and a diameter rise of δ = 1.67 in the billet sizes 610 × ext. 290 × 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 380 mm with a draw ratio μ = 1.24 and a rise in diameter δ = 1.64% in sleeves measuring 620 × Hv. 395 × 2580 mm. The sleeves are rolled on 8-16 "TPU with pilgrim mills in caliber 464 mm on mandrels with a diameter of 361/367 mm with a drawing coefficient μ = 3.21 and compression in diameter Δ = 27.74% into conversion tubes 448 × 44 × 6700 mm The conversion pipes were straightened in 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 size 426 × 22 × 3350 mm Adopted in accordance with TU 14-3R-197-2001 there are 426 × 22 × 3350 mm pipes with a total weight of 4003 kg and a flow rate of metal for the pipes of this batch was 2.830. According to the proposed technology, 3 hollow ESR ingots-blanks with a size of 650 × 300 × 2100 mm and a total weight of 12908 kg were specified in the production 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 cross-helical rolling mill on a mandrel with a diameter of 425 mm with ytyazhkoy μ = 1,35 and elevation diameter δ = 1,54% in the size of the sleeve 660hvn.440 × 2830 mm. The sleeves were rolled on a pilgrim mill in a caliber 498 mm with an angle of transverse release in the polishing section α a.s. = 25 °, cut into rolls with a barrel diameter of 1150 mm, into conversion pipes of 490 × 42 × 7600 mm in size on conical mandrels with a diameter of 407/413 mm with a drawing coefficient μ 1 = 3.22, compression in diameter of 24.62% and s feed sleeves in 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 × 25 × 3800 mm. Converted machined pipes with a size of 474 × 25 × 3800 mm were transferred for rolling at the KhPT 450 mill to commodity pipes with a size of 426 × 22 × 4550 mm with an exhaust hood μ = 1.26. In accordance with TU 14-3R-197-2001, six pipes with a size of 426 × 22 × 4550 mm (27.3 m) with a total weight of 5.981 tons were adopted. The expenditure coefficient of the metal in the pipes of this batch was 2.158. Thus, in the production of cold-rolled pipes with a size of 426 × 22 mm according to the proposed technology (method), a decrease in the cost coefficient of expensive metal per ton of pipes by 672 kg, an increase in length by 1.36 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 size of 426 × 20-22 mm for nuclear power facilities made of steel 08X18H10-Sh allows to 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 × 20-22 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 of size 650 × ext. 300 × 2100 ± 50 mm, heating the ingot blanks in a methodical furnace to a temperature of 1250-1260 ° C, dispensing 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 weighing 1000-1250 g, firmware rolling of ingot blanks in the cross-screw mill new rolling on a mandrel with a diameter of 425 mm with an extraction coefficient μ = 1.35 and a rise in diameter of δ = 1.54% into sleeves measuring 660 × ext. 440 × 2760-2900 mm, rolling the sleeves on TPU 8-16 '' with pilgrim mills on conical mandrels with a diameter of 407/413 mm in a 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. vyp = 24-26 °, into hot-rolled pig tubes with a size of 490 × 42 × 7400 -7800 mm with a drawing coefficient μ = 3.22, compression in diameter of 24.62%, with the supply of sleeves to the deformation zone m = 20-24 mm, a piece of technological waste - seed ends in 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 of 474 × 25 × 3700-3900 mm in size, rolling of machined billet pipes at the KhPT 450 mill into commodity pipes along the routes: 474 × 25 × 3700-3900 - 426 × 20 × 4850-5400, 474 × 25 × 3700-3900 - 426 × 21 × 4900-5160 and 474 × 25 × 3700-3900 - 426 × 22 × 4400-4700 mm with hood coefficients μ respectively 1.38, 1.32 and 1.26 and the heat treatment of cold-rolled tubes.
RU2016110207A 2016-03-22 2016-03-22 Method of manufacturing seamless pipes of size 426×20-22 mm for nuclear power facilities of steel of "08х18н10-ш" grade RU2615393C1 (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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