RU2613817C1 - METHOD FOR PRODUCING SEAMLESS PIPES OF 377×8-13 mm SIZE MADE OF STEEL OF "08Х18Н10Т-Ш" GRADE - Google Patents

METHOD FOR PRODUCING SEAMLESS PIPES OF 377×8-13 mm SIZE MADE OF STEEL OF "08Х18Н10Т-Ш" GRADE Download PDF

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RU2613817C1
RU2613817C1 RU2016110319A RU2016110319A RU2613817C1 RU 2613817 C1 RU2613817 C1 RU 2613817C1 RU 2016110319 A RU2016110319 A RU 2016110319A RU 2016110319 A RU2016110319 A RU 2016110319A RU 2613817 C1 RU2613817 C1 RU 2613817C1
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pipes
size
rolling
ingots
blanks
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RU2016110319A
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Анатолий Васильевич Сафьянов
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Комаров Андрей Ильич
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B21/00Pilgrim-step tube-rolling, i.e. pilger mills

Abstract

FIELD: metallurgy.
SUBSTANCE: method involves casting of hollow ingots by electroslag remelting, boring and turning them into ingots-billets, heating in a reheating furnace, drawing of ingots-billets on a trolley, blowing with compressed air, lubricating ingots-billets inside, from two ends, by a mixture of graphite with table salt, rolling them at a Pilger mill on taper mandrels to re-rolled hot-rolled pipes, segmentation of technological waste, straightening in a six-roll straightening machine with rolling heating temperature, austenitizing, cutting to two pipes of equal length, machining to pipe billets and rolling of machined pipe billets at CRM mill into commercial pipes with following heat treatment.
EFFECT: reduced expensive metal consumption, reduced roughness of outer and inner surfaces of pipes, improved productivity and increased lengths of pipes, reduced cost provided by regulation of processing modes at all stages of production.
2 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 of size 377 × 8-13 mm from steel grade 08X18H10T-Sh for nuclear power facilities, and can be used on TPU 8-16 '' with pilgrim mills in the manufacture of hot-rolled pipes with a size of 490 × 38 × 8400-8700 mm from hollow ingots-blanks of electroslag remelting with a size of 650 × ext. 450 × 3200 ± 50 mm, for subsequent machining - boring and turning them into conversion tubes-blanks with a size of 474 × 18 × 4200- 4350, 474 × 20 × 4200-4350 mm and roll them at the KhPT 450 mill into commodity pipes measuring 377 × 8-13 mm.

In pipe production, there is a known method for the production of commodity and conversion pipes from hardly deformable steel grades, including drilling a central hole with a diameter of 100 ± 5 mm in blanks and ingots-blanks ESR with a diameter of 380-500 mm, holding them on the grates of method furnaces at a temperature of 500-550 ° C for 70-90 minutes, depending on the diameter, after which heating to a temperature of 1120-1140 ° C at a speed of 1.4-1.5 deg / min, flashing blanks and ingots-blanks of ESR in a cross-helical rolling mill into sleeves size in size in diameter when soon the rotation speed of the work rolls 25-40 rpm on a mandrel with a diameter that ensures reduction on the pilgrim mill at least 25 mm (RF patent No. 2175899, bull. No. 32, 11/20/2001).

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

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

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

In the pipe industry, there is 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. = K ΔS V.S. , 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 coefficient of reduction in the size of the metal layer to be removed during turning, large values of which relate to pipes of large diameters, removal of undetected defects on conversion tubes-blanks by abrasive grinding or grinding, rolling of conversion tubes-blanks on mills CPT in commodity pipes with a roughness of the outer and inner planes of not more than R a 2.5 microns (RF patent No. 2401169, publ. 10.10.2010).

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 transversely 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; 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 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 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 of size 377 × 8-13 mm from 08Kh18N10T-Sh steel for nuclear power facilities.

The objective of the proposed method is the development of the production of seamless cold-rolled pipes with a diameter of 377 mm and a wall thickness of 8-13 mm for nuclear power facilities made of 08Kh18N10T-Sh steel from conversion billets of 474 × 18 × 4200-4350 and / or 474 × 20 × 4200 -4350 mm, obtained by machining - boring and turning of hot-rolled tubes of 490 × 38 × 8400-8700 mm in size, rolled at 8-16 '' TPU with pilgrim mills from hollow ingot blanks ESRs with a size of 650 × ext. 450 × 3200 + 50 mm, reduction of the expenditure coefficient of the metal during the redistribution of the hollow ingot agotovka ESR - commodity pipe made of corrosion-resistant steel 08Cr18Ni10Ti-III for nuclear power plants, the use for the manufacture of one size of a hollow billet ingot ESR and improved performance TPU 8-16 'during rolling of mother tubes.

The technical result is achieved due to the development of a method for the production of seamless pipes with a diameter of 377 mm and a wall thickness of 8-13 mm for nuclear facilities from steel grade 08X18H10-Sh, including the casting of hollow ingots by electroslag remelting with a size of 670 × ext. 430 × 3200 ± 50, boring and turning them into ingot blanks of size 650 × ext. 450 × 3200 ± 50 mm, heating in a methodical furnace to a temperature of 1250-1260 ° C, dispensing ingot ingots to an ingot cart, blowing them with compressed air, lubricating ingot blanks inside with two ends with a mixture of graphite with sodium chloride 50/50 weight 2000-2500 g, rolling them on a pilger conical Dornach 416/422 mm in diameter 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-blanks to the deformation zone m = 20-24 mm, into hot-rolled steel tubes measuring 490 × 38 × 8400-8700 mm with a drawing coefficient μ = 3.14 and compression in diameter of 24.62 %, technological waste cut, 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 equal lengths, machining into billet pipes size 474 × 18 × 4200-4350 and / or 474 × 20 × 4200-4350, rolling of machined tubes billets at the KhPT mill into the goods pipes along the routes: 474 × 18 × 4200-4350-426 × 13 × 6100-6300-377 × 8 × 10800-11100, 377 × 9 × 9500-9900 and 377 × 10 × 8600-8800 mm with hoods μ, respectively, 1.53, 1.82, 1.62 and 1.46, or along the route 474 × 20 × 4200-4350-426 × 16 × 5750-5950-377 × 11 × 9000-9300, 377 × 12 × 8300-8600 and 377 × 13 × 377 × 13 × 7600-7900 mm with drawing coefficients μ, respectively, of 1.45, 1.62, 1.50 and 1.39 and heat treatment.

If necessary, billet pipes of 474 × 18 × 4200-4350 mm in size can be obtained from machined billet pipes of 474 × 20 × 4200-4350 mm in size.

A comparative analysis of the proposed solution with the prototype shows that the claimed method differs from the known one in that they produce casting of hollow ingots by electroslag remelting of size 670 × ext. 430 × 3200 ± 50, boring and turning them into ingots-blanks of size 650 × ext. 450 × 3200 ± 50 mm, heating in a methodical furnace to a temperature of 1250-1260 ° С, delivery of ingot blanks to an ingot cart, blowing them with compressed air, lubrication of ingot blanks inside with two ends with a mixture of graphite with sodium chloride 50/50 weighing 2000-2500 g rolling them on a pilgrim mill at Dornach waist diameter of 416/422 mm in 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-blanks to the deformation zone m = 20-24 mm, into hot-rolled steel tubes measuring 490 × 38 × 8400-8700 mm with a drawing coefficient μ = 3.14 and compression in diameter of 24.62 %, technological waste cut, 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 equal lengths, machining into billet pipes size 474 × 18 × 4200-4350 and / or 474 × 20 × 4200-4350, rolling of machined tubes billets at the KhPT mill into the goods pipes along the route: 474 × 18 × 4200-4350-426 × 13 × 6100-6300-377 × 8 × 10800-11100, 377 × 9 × 9500-9900 and 377 × 10 × 8600-8800 mm with hoods μ, respectively, 1.53, 1.82, 1.62 and 1.46; or along the route 474 × 20 × 4200-4350-426 × 16 × 5750-5950-377 × 11 × 9000-9300, 377 × 12 × 8300-8600 and 377 × 13 × 377 × 13 × 7600-7900 mm with hoods μ respectively, 1.45, 1.62, 1.50 and 1.39 and heat treatment.

If necessary, billet pipes of 474 × 18 × 4200-4350 mm in size can be obtained from machined billet pipes of 474 × 20 × 4200-4350 mm in size.

Comparison of the proposed method not only with the prototype, but also with other technical solutions in this technical field made it possible to identify signs that distinguish the claimed method from the prototype, which meets the patentability criterion of "novelty."

The method was tested at Chelyabinsk Tube Rolling Plant OJSC on a tube rolling unit with 8-16 '' pilgrim mills when rolling redacting tubes 490 × 38 × 8500 mm in size from EShP hollow ingot blanks of 650 × in. 450 × 3200 mm in size from 08Kh18N10T steel -Sh with subsequent boring and turning them into billet pipes of 474 × 20 × 4250 mm in size and rolling them at the KhPT 450 mill into commodity pipes along the route: 474 × 20 × 4250-426 × 16 × 5600-377 × 12 × 8150 mm with hoods μ, 1.38 and 1.50, respectively - the proposed technology. According to the existing technology, ESR ingots of 540 × 100 × 1750 mm in size were heated in a methodical furnace to a plasticity temperature and were stitched in a cross-helical rolling mill on a mandrel with a diameter of 250 mm with an extractor μ = 1.25, size in size by outer diameter in sleeves - workpieces with a size of 540 × ext. 265 × 2180 mm, which were heated from a cold embankment to a plasticity temperature and stitched — rolled out in a cross-helical rolling mill on a mandrel with a diameter of 350 mm with a hood μ = 1.20 with a diameter rise of δ = 4, 0% in sleeves measuring 560 × ext. 365 × 2620 mm. The sleeves were rolled at 8-16 '' TPU with pilgrim mills in caliber 410 mm into conversion tubes of 398 × 32 × 8500 mm in size with a draft of μ = 3.85 and compression in diameter Δ = 28.93%. Conversion pipes were cut into two pipes of equal length, bored and turned into commodity pipes measuring 377 × 12 × 4250 mm. Data on the technological parameters of the production of commodity pipes 377 × 12 mm in size from hollow ingots - ESHP blanks of 08Kh18N10T-Sh steel of size 650 × int. 450 × 3200 mm (proposed technology) and from ESH ingots-blanks of 540 × 100 × 1750 mm in size ( existing technology) are given in table 1.

Figure 00000001

The table shows that, according to the existing technology, 3 ESR ingots-blanks with a size of 540 × 100 × 1750 mm with a total weight of 9115 kg were set into production. The ingot billets were heated in a methodical furnace to a temperature of 1250-1260 ° C, stitched in a cross-helical mill on a mandrel with a diameter of 250 mm with a hood μ = 1.25 and a diameter rise of δ = 0 in the billet blanks with a size of 540 × vn .265 × 2180 mm, which were heated from a cold embankment to a temperature of 1250-1260 ° C and stitched - rolled in a cross-helical rolling mill on a mandrel with a diameter of 350 mm with a draw ratio μ = 1.20 and a diameter rise of δ = 4, 0% in sleeves measuring 560 × ext. 365 × 2620 mm. The sleeves are rolled on 8-16 '' TPU with pilgrim mills in caliber 410 mm on mandrels with a diameter of 335/341 mm with a hood μ = 3.85 and compression in diameter Δ = 28.93% into conversion pipes with a size of 398 × 32 × 8500 mm . Conversion pipes were straightened in a six-roll straightening machine and heat-treated. Since on existing equipment it is possible to bore and grind conversion pipes with a length of not more than 6000 mm, the conversion pipes were cut into two pipes of equal length, bored and turned into commodity pipes measuring 377 × 12 × 4250 mm. Six pipes with a size of 377 × 12 × 4250 mm with a total weight of 2.754 tons were adopted. The expenditure coefficient of the metal for pipes of this batch was 3.310. 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 were set into production, which were heated in a methodic furnace to a temperature of 1250-1260 ° C, delivered from the furnace to an ingot cart, purged with compressed a mixture of graphite with sodium chloride 50/50 weighing 2000-2500 g was fed from the two ends to the inside of the ingots for lubrication; mm caliber 498 mm nnom in rolls with a diameter of barrel 1150 mm, with an angle transverse to release polishing portion p.vyp α. = 24-26 °, into conversion pipes 490 × 38 × 8500 mm in size with a hood μ = 3.14, compression in diameter of 24.62%, with hollow ingot blanks fed into the deformation zone m = 20-22 mm. Technological waste - seed ends and pilgrim heads were removed with a hot cutting saw. Pipes were ruled in a six-roll straightening machine using the rolling heating temperature for 2-3 passes to a curvature of not more than 6.0 mm for the total length of the pipes. After austenization, the pipes were cut into two billet pipes of equal length, and then bored and turned into conversion billet pipes measuring 474 × 20 × 4250 mm. Machined billet pipes were rolled at the KhPT 450 mill into commodity pipes along the route: 474 × 20 × 4250-426 × 16 × 5600-377 × 12 × 8150 mm with hoods μ, respectively, 1.38 and 1.50. Accepted - 48.9 m of pipes measuring 377 × 12 mm with a total weight of 5.282 tons. The expenditure coefficient of the metal for the pipes of this batch was 2.464. Thus, in the production of pipes with a size of 377 × 12 × 2 × 8150 mm according to the proposed technology (method), a reduction in the cost coefficient of expensive metal per ton of pipes by 846 kg, an increase in length by 1.92 times, is obtained.

Using the proposed method for the production of seamless pipes with a diameter of 377 mm and a wall thickness of 8 to 13 mm for nuclear power facilities made of 08Kh18N10T-Sh steel will significantly reduce the consumption of expensive metal, reduce the roughness of the outer and inner surfaces, increase the productivity of TPU 8-16 '', increase the length of the pipes, and therefore reduce their cost.

Claims (2)

1. A method for the production of seamless pipes 377 × 8-13 mm in size from 08Kh18N10T-Sh steel, including the casting of hollow ingots by electroslag remelting of 670 × vn. 430 × 3200 ± 50 in size, boring and turning them into 650 × vn ingots. 450 × 3200 ± 50 mm, heating in a methodical furnace to a temperature of 1250-1260 ° C, delivery of ingot blanks to an ingot trolley, blowing them with compressed air, feeding into ingot blanks from two ends of a lubricant weighing 2000-2500 g in the form of a mixture of graphite with table salt in a ratio of 50/50, rolling them on a pilgrim mill on a conical mandrel diameter m 416/422 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 ° and with the supply of hollow ingots-blanks to the deformation zone m = 20-24 mm into hot rolled hot-rolled pipes of 490 × 38 × 8400-8700 mm in size with a drawing coefficient μ = 3.14 and compression in diameter of 24.62%, a piece of technological waste, straightening in a six-roll straightening machine using rolling heating temperature in 2-3 passes to a curvature of not more than 6.0 mm per length of the conversion pipe, austenization, pipe cutting into two equal lengths, mechanical processing into conversion billet pipes of sizes 474 × 18 × 4200-4350 and 474 × 20 × 4200-4350, rolling of machined pipe billets at the HPT mill into commodity pipes along the route: 474 × 18 × 4200-4350 - 426 × 13 × 6100-6300 - 377 × 8 × 10800-11100, 377 × 9 × 9500-9900 and 377 × 10 × 8600-8800 mm with an extraction coefficient μ, respectively, of 1.53, 1.82, 1.62 and 1, 46 and along the route: 474 × 20 × 4200-4350 - 426 × 16 × 5750-5950 - 377 × 11 × 9000-9300, 377 × 12 × 8300-8600 and 377 × 13 × 7600-7900 mm with hoods μ, respectively 1.45, 1.62, 1.50 and 1.39.
2. The method according to p. 1, characterized in that the pipe blanks with a size of 474 × 18 × 4200-4350 mm are obtained from machined pipe blanks with a size of 474 × 20 × 4200-4350 mm.
RU2016110319A 2016-03-22 2016-03-22 METHOD FOR PRODUCING SEAMLESS PIPES OF 377×8-13 mm SIZE MADE OF STEEL OF "08Х18Н10Т-Ш" GRADE RU2613817C1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4641513A (en) * 1983-08-01 1987-02-10 Vallourec Cold rolling process for tubes, by means of a Pilger rolling mill and the rolling mill for its execution
RU2257271C1 (en) * 2004-03-03 2005-07-27 ООО "Специальные Стали и Сплавы" Method for making elongated conversion large- and mean- diameter tubes of centrifugally cast hollow billets and electroslag refining ingots of steels for telescopic systems (periscopes of submarines)
RU2322315C2 (en) * 2006-05-22 2008-04-20 ОАО "Челябинский трубопрокатный завод" Method for producing in tube rolling plants with pilger mills seamless hot-deformed elongated tubes for steam boilers, steam conduits and manifolds of plants with high and super-critical parameters of steam
RU2401169C2 (en) * 2008-04-18 2010-10-10 ОАО "Челябинский трубопрокатный завод" Method of producing high-quality pipes from antirust steel 08x18h10t-"+" for nuclear power engineering structures

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4641513A (en) * 1983-08-01 1987-02-10 Vallourec Cold rolling process for tubes, by means of a Pilger rolling mill and the rolling mill for its execution
RU2257271C1 (en) * 2004-03-03 2005-07-27 ООО "Специальные Стали и Сплавы" Method for making elongated conversion large- and mean- diameter tubes of centrifugally cast hollow billets and electroslag refining ingots of steels for telescopic systems (periscopes of submarines)
RU2322315C2 (en) * 2006-05-22 2008-04-20 ОАО "Челябинский трубопрокатный завод" Method for producing in tube rolling plants with pilger mills seamless hot-deformed elongated tubes for steam boilers, steam conduits and manifolds of plants with high and super-critical parameters of steam
RU2401169C2 (en) * 2008-04-18 2010-10-10 ОАО "Челябинский трубопрокатный завод" Method of producing high-quality pipes from antirust steel 08x18h10t-"+" for nuclear power engineering structures

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