RU2613812C1 - METHOD FOR PRODUCING SEAMLESS PIPES WITH DIAMETER 377 mm AND WALL THICKNESS 14-18 mm OF STEEL OF "08Х18Н10Т-Ш" GRADE - Google Patents

METHOD FOR PRODUCING SEAMLESS PIPES WITH DIAMETER 377 mm AND WALL THICKNESS 14-18 mm OF STEEL OF "08Х18Н10Т-Ш" GRADE Download PDF

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RU2613812C1
RU2613812C1 RU2016110235A RU2016110235A RU2613812C1 RU 2613812 C1 RU2613812 C1 RU 2613812C1 RU 2016110235 A RU2016110235 A RU 2016110235A RU 2016110235 A RU2016110235 A RU 2016110235A RU 2613812 C1 RU2613812 C1 RU 2613812C1
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pipes
diameter
blanks
rolling
size
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RU2016110235A
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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 of regulated size by electroslag remelting, thier boring and turning into ingots-billets, heating, rolling at 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 along regulated routes with following heat treatment.
EFFECT: reduced expensive metal consumption, reduced roughness of outer and inner pipe surfaces, increased productivity.
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 with a diameter of 377 mm and a wall thickness of 14 to 18 mm from steel grade 08X18H10T-Sh, which can be used for nuclear power facilities, and the production method can be carried out at TPU 8 -16ʺ with pilgrim mills in the manufacture of hot-rolled chimneys measuring 490 × 43 × 7300-7600 mm from hollow ingots-blanks of electroslag remelting with dimensions 650хvn. 450 × 3200 ± 50 mm, for subsequent machining - boring and turning ki them into conversion billet pipes with sizes of 474 × 24 × 3650-3800 and 474 × 26 × 3650-3800 mm and rolling them at the KhPT 450 mill into commodity pipes with a diameter of 377 mm and a wall thickness of 14-18 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 necessary, 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 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 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 flashing process is painting weaving (the second firmware) from capturing the billet sleeve to being completely on the mandrel leads 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 pipe rolling on a pilgrim mill is carried out with an extractor μ = 3.0-5.0 (RF patent No. 22427612, 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 the production of high-quality pipes from corrosion-resistant steel grades 08X18H10T-Sh for nuclear power facilities, which includes casting ingots by electroslag remelting, turning ingots into ingot blanks, drilling in ingots-blanks of a central hole 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, neg shortening 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 expressions: ΔS v.p. VS = KΔS , ΔS n.p. = K 1 ΔS ps 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 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, 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 diameter of 377 mm and a wall thickness of 14-18 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 377 mm and a wall thickness of 14-18 mm for nuclear facilities from steel grade 08X18H10T-Sh from conversion billet pipes of 474 × 22 × 3650-3800 and 474 × 24 × 3650-3800 mm obtained by machining - boring and turning of hot rolled tubes of 490 × 43 × 7300-7600 mm in size, rolled at TPU 8-16ʺ with pilgrim mills from hollow ingots-blanks ESHP with dimensions 650хvn. 450 × 3200 ± 50 mm, reduction in the expenditure coefficient metal during redistribution hollow ingot ESH forging - 08Kh18N10T-Sh corrosion-resistant steel commodity pipe for nuclear power facilities, the use of ESW hollow ingot billets for the production of one size and increasing the productivity of TPU 8-16ʺ when rolling pig tubes.

The technical result is achieved through the use of a method for the production of seamless pipes with a diameter of 377 mm and a wall thickness of 14-18 mm for nuclear power facilities made of steel grade 08Kh18N10-Sh, including casting by electroslag remelting of hollow ingots of size 670хvn.430 × 3200 ± 50, boring and turning them into ingot blanks of size 650 × Hv. 450 × 3200 ± 50 mm, heating in a methodical furnace to a temperature of 1250-1260 ° C, dispensing ingot blanks to an ingot cart, blowing them with compressed air, lubricating the ingot blanks from the two ends with a mixture of graphite with cookery pour in a proportion of 50/50 weighing 2000-2500 g, rolling them into hot-rolled chimneys measuring 498 × 43 × 7300-7600 mm with a drawing coefficient μ = 2.80 and compression in diameter of 24.62% on a pilgrim mill on conical mandrels with a diameter 406/412 mm (first size refers to the diameter of the front portion of the mandrel, and the second - to the diameter of the rear portion), 498 mm in caliber, embedded in rolls with a diameter of barrel 1150 mm, with an angle transverse to release polishing portion caliber α p.vyp . = 24-26 °, with the supply of m ingots-blanks to the deformation zone equal to 20-24 mm, a piece of technological waste, straightening in a six-roll straightening machine using the rolling heating temperature for 2-3 passes to the curvature not exceeding 6.0 mm the length of the pipe, austenization, cutting each pipe into two pipes of equal length, their machining into conversion blanks of 474 × 24 × 3650-3800 and 474 × 26 × 3650-3800 mm in size, rolling of machined blanks at the KhPT mill into the goods pipes along the route: 474 × 24 × 3650-3800 - 426 × 19 × 4800-5000 - 377 × 14 × 7000-7300, 377 × 15 × 6500-6800, 3 77 × 16 × 6100-6350 mm with hood coefficients μ, respectively, of 1.40, 1.52, 1.42 and 1.34 and along the route: 474 × 26 × 3650-3800 - 426 × 22 × 4700-4900 - 377 × 17 × 6500-6800 and 377 × 18 × 6100-6400 mm, with drawing coefficients μ, respectively, of 1.38, 1.45 and 1.38 and heat treatment.

If necessary, billet pipes with a size of 474 × 24 × 3650-3800 mm can be obtained from conversion machined pipe billets with a size of 474 × 26 × 3650-3800 mm.

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 670хвн. 430 × 3200 ± 50 mm, boring and turning them into ingots-blanks of size 650хвн. 450 × 3200 ± 50 mm, heating in a methodical furnace to a temperature of 1250-1260 ° C, dispensing ingot blanks onto an ingot trolley, blowing them with compressed air, lubricating the ingot blanks from the two ends with a mixture of graphite with sodium chloride 50/50 weighing 2000-2500 g, rolling them onto pilgrim camp Dornach waist diameter of 406/412 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 °, by feeding ingot blanks to the deformation zone m = 20-24 mm, into hot-rolled steel tubes measuring 498 × 43 × 7300-7600 mm in size with a drawing coefficient μ = 2.80 and a compression in diameter of 24.62%, a piece of technological waste - seed ends and pilgrim heads with a hot cutting saw, straightening 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 pipe length, austenization, pipe cutting into two equal lengths, machining into conversion billet pipes of sizes 474 × 24 × 3650-3800 and 474 26 × 3650-3800 mm, rolling of machined blanks at the KhPT mill into commodity pipes along the route: 474 × 24 × 3650-3800 - 426 × 19 × 4800-5000 - 377 × 14 × 7000-7300, 377 × 15 × 6500-6800, 377 × 16 × 6100-6350 mm with drawing coefficients μ, respectively, of 1.40, 1.52, 1.42 and 1.34; or along the route: 474 × 26 × 3650-3800 - 426 × 22 × 4700-4900 - 377 × 17 × 6500-6800 and 377 × 18 × 6100-6400 mm, with hood coefficients μ, respectively, of 1.38, 1, 45 and 1.38 and heat treatment.

If necessary, billet pipes with a size of 474 × 24 × 3650-3800 mm can be obtained from conversion machined pipe billets with a size of 474 × 26 × 3650-3800 mm.

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 at a tube rolling plant with pilgrim mills 8-16ʺ when rolling redacting tubes measuring 490 × 43 × 7450 mm from hollow ingots-blanks EShP measuring 650 x Hv. 450 × 3200 mm from 08Kh18N10T-Sh steel followed by boring and turning them into billet pipes 474 × 24 × 3725 mm in size and rolling them at the KhPT 450 mill into commodity pipes along the route: 474 × 24 × 3725 - 426 × 19 × 4900 - 377 × 16 × 6250 mm with hoods μ, 1.40 and 1.34, respectively, are 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 540hvn.265 × 2180 mm, which were heated from a cold embankment to a plasticity temperature and stitched - were 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 560hvn. 365 × 2620 mm. The sleeves were rolled on TPU 8-16ʺ with pilgrim mills in caliber 410 mm into conversion tubes measuring 398 × 36 × 7600 mm with an exhaust hood μ = 3.46 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 × 16 × 3800 mm. Data on the technological parameters of the production of commodity pipes of size 377 × 16 mm from hollow ingot blanks EShP steel grade 08X18H10T-Sh of size 650hvn. 450 × 3200 mm (proposed technology) and from ingot blanks EShP size 540 × 100 × 1750 mm (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. 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 250 mm with a hood μ = 1.25 and a rise in diameter of δ = 0 in billet blanks measuring 540хвн.265 × 2180 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 350 mm with a hood μ = 1.20 and a diameter rise of δ = 4.0% in sleeves measuring 560hvn. 365 × 2620 mm. The sleeves were rolled on TPU 8-16ʺ with pilgrim mills in caliber 410 mm on mandrels with a diameter of 319/325 mm with a hood μ = 3.46 and compression in diameter Δ = 28.93% into conversion pipes with a size of 398 × 36 × 7600 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 × 16 × 3800 mm. Six pipes with a size of 377 × 12 × 3800 mm with a total weight of 3.246 tons were adopted. The expenditure coefficient of the metal for the pipes of this batch was 2.808. According to the proposed technology, 3 hollow EAW ingot billets with dimensions 650хвн. 450 × 3200 mm with a total weight of 13015 kg, which were heated in a methodic furnace to a temperature of 1250-1260 ° С, were delivered to the ingot cart, purged with compressed air, a mixture of graphite with sodium chloride 50/50 weighing 2000-2500 g was fed from both ends into the ingots-blanks for lubrication, hollow ingots-blanks were fed by a crane to the input side of the piligim mill, rolling on the pilgrim mill was performed on conical mandrels with a diameter of 406/412 mm in caliber 498 mm nnogo 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 measuring 490 × 43 × 74500 mm with a hood μ = 2.80, compression in diameter of 24.62%, with hollow ingot blanks fed into the deformation zone m = 20-24 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 × 24 × 3725 mm. Machined billet pipes were rolled at the KhPT 450 mill into commodity pipes along the route: 474 × 24 × 3725 - 426 × 19 × 4900 - 377 × 16 × 6250 mm with hoods μ, respectively, 1.40 and 1.34. Accepted 37.5 m pipes 377 × 16 × 6250 mm in size with a total weight of 5.339 tons. The expenditure coefficient of the metal in the pipes of this batch was 2.438. Thus, in the production of pipes with a size of 377 × 16 × 6250 mm according to the proposed technology (method), a decrease in the cost coefficient of expensive metal per ton of pipes by 370 kg, an increase in length by 1.65 times, is obtained.

Using the proposed method for the production of seamless pipes with a diameter of 377 mm and a wall thickness of 14 to 18 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 8-16ʺ, increase the length of the pipes , and, therefore, reduce their cost.

Claims (2)

1. Method for the production of seamless pipes with a diameter of 377 mm and a wall thickness of 14-18 mm from 08Kh18N10T-Sh steel, including casting by electroslag remelting of hollow ingots of size 670хvn. 430 × 3200 ± 50, boring and turning them into ingots-blanks of size 650хvn. 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 in a proportion of 50/50 weight 2000-2500 g, rolling them into hot-rolled steel tubes in sizes 498 × 43 × 7300-7600 mm with a drawing coefficient μ = 2.80 and compression in diameter of 24.62% on a pilgrim mill on conical mandrels with a diameter of 406/412 mm in a caliber 498 mm cut into rolls with a barrel diameter of 1150 mm, s the angle of the transverse outlet on the polishing section of the caliber α a.s. vyp = 24-26 ° and with the supply of m ingots-blanks into the deformation zone equal to 20-24 mm, a piece of technological waste, straightening in a six-roll straightening machine using the temperature of rolling heating for 2- 3 passes to curvature not exceeding 6.0 mm per pipe length, austenization, cutting of each pipe into ve pipes of equal length, their machining into conversion billets of 474 × 24 × 3650-3800 and 474 × 26 × 3650-3800 mm in size, rolling of machined pipe billets at the KhPT mill into commodity pipes along the route: 474 × 24 × 3650-3800 - 426 × 19 × 4800-5000 - 377 × 14 × 7000-7300, 377 × 15 × 6500-6800 and 377 × 16 × 6100-6350 mm with drawing coefficients μ respectively 1.40, 1.52, 1 , 42 and 1.34 and along the route: 474 × 26 × 3650-3800 - 426 × 22 × 4700-4900 - 377 × 17 × 6500-6800 and 377 × 18 × 6100-6400 mm, with hood coefficients μ, respectively, 1.38, 1.45 and 1.38 and heat treatment.
2. The method according to p. 1, characterized in that the pipe blanks with a size of 474 × 24 × 3650-3800 mm, if necessary, are obtained from the converted machined pipe blanks with a size of 474 × 26 × 3650-3800 mm.
RU2016110235A 2016-03-22 2016-03-22 METHOD FOR PRODUCING SEAMLESS PIPES WITH DIAMETER 377 mm AND WALL THICKNESS 14-18 mm OF STEEL OF "08Х18Н10Т-Ш" GRADE RU2613812C1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4798071A (en) * 1986-06-25 1989-01-17 Kocks Technik Gmbh & Co. Seamless tube production
RU2247612C2 (en) * 2003-05-06 2005-03-10 ОАО "Челябинский трубопрокатный завод" Method for making hot deformed and conversion mean- and large-diameter tubes of corrosion resistant hard-to-form steels and alloys in tube rolling aggregate with pilger mills
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)
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
US4798071A (en) * 1986-06-25 1989-01-17 Kocks Technik Gmbh & Co. Seamless tube production
RU2247612C2 (en) * 2003-05-06 2005-03-10 ОАО "Челябинский трубопрокатный завод" Method for making hot deformed and conversion mean- and large-diameter tubes of corrosion resistant hard-to-form steels and alloys in tube rolling aggregate with pilger mills
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)
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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