RU2242302C2 - Method for producing hot rolled tubes of large and mean diameters of hard-to-form steels and alloys in tube rolling plants with pilger mills - Google Patents

Method for producing hot rolled tubes of large and mean diameters of hard-to-form steels and alloys in tube rolling plants with pilger mills Download PDF

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RU2242302C2
RU2242302C2 RU2003101009/02A RU2003101009A RU2242302C2 RU 2242302 C2 RU2242302 C2 RU 2242302C2 RU 2003101009/02 A RU2003101009/02 A RU 2003101009/02A RU 2003101009 A RU2003101009 A RU 2003101009A RU 2242302 C2 RU2242302 C2 RU 2242302C2
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diameter
sleeves
rolling
ingots
rolled
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RU2003101009/02A
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Russian (ru)
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RU2003101009A (en
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нов А.В. Сафь (RU)
А.В. Сафьянов
А.А. Фёдоров (RU)
А.А. Фёдоров
В.В. Игнатьев (RU)
В.В. Игнатьев
Л.И. Лапин (RU)
Л.И. Лапин
И.А. Романцов (RU)
И.А. Романцов
С.В. Ненахов (RU)
С.В. Ненахов
В.А. Логовиков (RU)
В.А. Логовиков
В.Г. Смирнов (RU)
В.Г. Смирнов
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ОАО "Челябинский трубопрокатный завод"
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Abstract

FIELD: rolled tube production, namely mean and large diameter hot rolled tubes of hard-to-form steels and alloys.
SUBSTANCE: method comprises steps of drilling and boring ingots of electroslag refining to hollow ingot-sleeves whose inner diameter exceeds by 40 -50 mm diameter of drift of pilger mill; heating then until yielding temperature and rolling hollow ingot-sleeves in pilger mills to hot rolled tubes; expanding heated until yielding temperature drilled ingots of electroslag refining to hollow billet-sleeves with elongation factor μ = 1.2 - 1.8 without increasing according to diameter; turning them and boring for removing forging flaws; heating up to yielding temperature and rolling in pilger mills at elongation factor μ = 5.0 or less or expanding drilled ingots of electroslag refining to hollow billet-sleeves at elongation factor μ = 0.9 -1.5 increased according to diameter from 1.05 up to 1.4; rolling in pilger mills at elongation factor μ = 5.5 or less.
EFFECT: lowered metal consumption, lowered cost of hot rolled tubes, improved quality of tubes, enhanced operational reliability of pilger mills.
2 cl, 1 tbl

Description

The invention relates to pipe rolling production, and in particular to a method for the production of hot-rolled conversion pipes of large and medium diameters from hard-to-deform grades of steel and alloys, of the following grades 10X23H18, 08X17H15M, 08X20H15C2, 08X22H6T, 20X25H25TYU-SH, 09X14H19B2SR, XH32TNHT, XHTNT28, HNTTN, TN, TN, TN, TN and etc.

In pipe rolling production, there is a known method for producing hot-rolled conversion pipes of large and medium diameters from hard-to-deform steel grades and alloys in pipe rolling plants with pilgrim mills, including heating hollow centrifugally cast billets to a plasticity temperature, rolling them in pilgrim mills into tubes in rolls whose caliber in the polishing section made round with an angle of transverse release α = 20-25 °, on mandrels with a difference between the inner diameter of centrifugally cast billets and the diameter of the mandrel, equal to 20-25 mm, and a drawing coefficient μ = 1.95-3.0 (TU 14-3-1564-88, TI 158-Tr. TB 1-69-98 "Hot-deformed seamless pipes, thick-walled from 08Kh10N20T2 steel, 08X10H16T2 ").

The disadvantage of this method is the use of low-quality centrifugal cast billets due to the lack of firmware technology for cross-helical rolling of ESR ingots and billets with a diameter of 400-600 mm from hard-deformed steel and alloys. The use of centrifugally cast billets leads to increased rejects, an increase in machining allowance, a decrease in the mechanical characteristics of the pipe metal, which, in turn, leads to an increase in the wall thickness of the finished product, i.e. its weight (retractable systems operating in sea water), and, as a result, to an increase in metal consumption. It is impossible to obtain pipes with high mechanical properties and a fine-grained structure from centrifugally cast billets due to the small degree of deformation.

In pipe-rolling production, a method of rolling pipes on pilgrim mills is known, where the inner diameter of the sleeve blanks is determined by the degree of introduction of the mandrel into the sleeve blanks, i.e. so that the gap between the inner diameter of the blanks-sleeves and the diameter of the mandrel would be minimal and sufficient for its introduction. This gap is 10-25 mm. Larger values refer to large pipe diameters (F.A. Danilov et al. Hot rolling of pipes. - M.: Metallurgizdat, 1962, p. 294).

The disadvantage of this method of rolling blanks-sleeves from hard-deformed grades of steel and alloys is the formation of defects in the form of flaws and landing blanks-sleeves on the mandrel (tightening the mandrels in the blanks-sleeves) due to the small gap between the inner diameter of the blanks-sleeves and mandrels. With a small gap during deformation, a large contact surface is formed at the metal-mandrel interface, metal flow along the mandrel is hindered by an increase in friction forces, as a result, more plastic surface metal layers break the metal layers on the inner surface of the pipe, which is also aggravated by natural heat removal by the mandrel. In addition, a small reduction in diameter creates a small ovalization, which leads to the fit of sleeve tubes on the mandrels as they are rolled and cooled (tightening the mandrels), i.e. to the termination of the rolling process and, as a consequence, to increased marriage and metal consumption.

The closest technical solution is a method for the production of hot rolled steel tubes from 20Kh25N25TYu-Sh steel with a size of 325 × 40 mm for the manufacture of water-cooled furnace rollers with a size of 295 × 22 × 2750 mm, including drilling and boring of ESR ingots with a size of 480 × 1600 mm and a diameter of 285 +5 -0 mm, heating them to the temperature of plasticity, rolling on pilgrim mills in 325 × 40 mm pipes on mandrels with an increased taper of 246/238 mm with a difference (gap) between the inner diameter of the bored shell ingots and the maximum diameter of the mandrels, equal to 39-44 mm , and the drawing coefficient μ = 3.4 (protocol No. 1031 for agreeing on the conditions for the supply of pipes made of steel 20Kh25N25TYu-Sh dated 12/12/2000 and a letter indicating pilot-industrial rolling of hot rolled steel tubes measuring 325 × 40 mm from steel 20Kh25N25TYu -W).

The disadvantage of this method is the use of bored ingot sleeves with an inner diameter greater than the diameter of the mandrel by 40-50 mm, because with smaller gaps on the inner surface of the pipes defects are formed in the form of flaws and frequent "tightening" of the mandrels, even with increased taper. The operation of boring ingots from a diameter of 100 mm to 285-290 mm is laborious and leads to increased consumption of metal, because when boring, 30 to 45% of the metal goes into shavings. The amount of chips increases with the diameter of the conversion pipes, i.e. the inner diameter of the ingot shells, and this ultimately leads to a significant increase in the cost of the finished product.

The aim of the proposed method is to eliminate the expensive operation of boring ingots, reduce the likelihood of defects (flaws) on the conversion pipes, eliminate “tightening” of the mandrels, and most importantly, reduce the consumption of metal during redistribution of the ingot — the conversion pipe and, therefore, reduce the cost of the finished product (conversion pipes of large and medium diameters from hard-deformed grades of steel and alloys).

This goal is achieved by the fact that in the known method for the production of hot-rolled conversion pipes of large and medium diameters from hard-to-deform grades of steel and alloys in tube-rolling plants with pilgrim mills, including drilling and boring of ESR ingots into hollow ingots-sleeves, the inner diameter of which is 40-50 mm more diameters of the mandrels of the pilgrim mills, heating them to the ductility temperature and rolling the hollow ingots-shells on the pilgrim mills into hot-rolled conversion tubes heated to the temperature of the layer In particular, EBP ingots are expanded into hollow shell billets with a hood μ = 1.2-1.8 without lifting in diameter, machined and bored to remove forging rowan and defects (microcracks), heated to ductility temperature and rolled on pilgrim mills with with a fume μ≤5.0 or drilled ESR ingots are expanded into hollow shell billets with a fume hood μ = 0.9-1.5 and a diameter rise of 1.05 to 1.4, then grind and bore them to remove forging rowan and defects, heated to a temperature of plasticity and rolled on pilgrim s tanah with hood μ≤5.5.

Drilled ESR ingots from hard to deform steel grades and alloys on radially forging machines heated to a temperature of plasticity are expanded into high-quality hollow shell sleeves due to crushing deformation. The process of expanding ESR drilled ingots (forging on radial forging machines) is carried out without diameter rise with a hood μ = 1.2-1.8 or with a diameter rise from 1.05 to 1.4 with a hood μ = 0.9- 1.5, depending on the receipt of blanks-sleeves for rolling on pilgrim mills conversion tubes of the required size. After cooling, the blanks-sleeves are turned and bored to remove the forging roughness or possible forging microcracks, which can be stress concentrators during pilgrim rolling and lead to the formation of defects. The inner diameter of the sleeve blanks is 40-50 mm larger than the diameter of the mandrels of the pilgrim mills. Since the rolling process on pilgrim mills is periodic with the edge of the blanks-sleeves-tubes turning at an angle of ≈90 °, due to non-contact deformation, the oval formed during reduction passes into a circle whose diameter is larger than the diameter of the mandrel. Thus, pipes made of hard-deformed grades of steel and alloys with an increased coefficient of linear expansion freely descend from the mandrel. An increase in ovization leads to a slight decrease in pipe accuracy in diameter. And since the hot-rolled pipes from hard-deformed grades of steel and alloys are redistributable, i.e. after rolling are machined or machined and then rolled on cold rolling mills, a slight increase in the tolerance on the diameter of the pipes is economically feasible compared with a decrease in the likelihood of internal defects (flaws), with the exception of tightening the mandrels, reducing the metal loads on the rolls and drive of pilgrim mills, and consequently, a reduction in metal consumption during the redistribution of an ESR ingot — a hot-rolled conversion billet.

The process of pilgrim rolling from blanks-sleeves expanded without a rise in diameter is carried out with an extract of μ≤5.0, and from blanks-sleeves expanded without a rise in diameter from 1.05 to 1.4, with an extract of µ≤5.5 . When rolling pipes from hardly deformable grades of steel and alloys with a wall thickness of less than 20 mm, the likelihood of defects in the form of flaws sharply increases, the longitudinal difference increases due to an increase in the load on the rolls and a decrease in the temperature of the blanks from the beginning to the end of rolling. When using hot-rolled conversion tubes for cold rolling, it is economically feasible to mechanically process (turning and boring) pipes with a thick wall and a shorter length than pipes with a thin wall and a longer length.

A comparative analysis of the proposed solution with the prototype shows that the claimed method differs from the known one in that the production of hot-rolled conversion pipes of large and medium diameters from hard-to-deform steel grades and alloys in pipe rolling plants with pilgrim mills is carried out from expanded blanks with hoods μ = 1.2 -1.8 without diameter rise or from expanded sleeve blanks with a hood μ = 0.9-1.5 and diameter rise from 1.05 to 1.4, and rolling of conversion tubes on pilgrim mills in the first case e lead with a hood μ≤5.0, and in the second with a hood μ≤5.5. Thus, the claimed method meets the criteria of the invention of "novelty."

Comparison of the proposed solution (method) not only with the prototype, but also with other technical solutions in the art did not allow them to identify signs that distinguish the claimed solution from the prototype, which allows us to conclude that the criterion of "significant differences".

The method was tested on a pipe-rolling plant with 8-16 pilgrim mills of ChTPZ OJSC and a radial forging machine of VSMPO OJSC (Verkhnyaya Salda Metallurgical Production Association). 20 ESR ingots with a size of 430 × 1600-1700 mm were set into production.

The table shows comparative data on rolling pipes of size 273 × 22 mm from ESR ingots of size 430 × 1600-1700 mm of steel grade 06XH28MDT, drilled and bored to a size of 430 × 80 × 1600-1700 mm (D × S × L), as well as from ESR ingots drilled to a size of 430 × 100 × 1600-1700 mm with subsequent expansion into blanks-sleeves of 430 × 80 × 2500-2650 mm in size without diameter rise with an extrusion coefficient when expanding μ = 1.56 and drilled ESR ingots of size 430 × 100 × 1600-1700 mm, followed by expansion into blanks-sleeves with a size of 500 × 80 × 2100-2200 mm, with an exhaust ratio ki when expanding μ = 1.3 and a coefficient of rise in diameter of 1.16. At the same time, drilled ESR ingots 430 × 100 × 1600-1700 mm in size were expanded into blanks-sleeves 530 × 90 × 1750-1850 mm in size with an expansion coefficient μ = 1.1 and an expansion coefficient of 1.23 in diameter when expanding. After expansion, the blanks were turned, bored and cut to size, respectively 420 × 70 × 2300-2400, 490 × 70 × 1900-2000 and 520 × 80 × 1550-16500 mm. The removal of metal on the outer and inner surfaces of the blanks-sleeves amounted to 5.0 mm

The billet sleeves were heated in methodological furnaces to the temperature of plasticity and rolled on a pilgrim mill in hot-rolled conversion tubes measuring 273 × 22 × 6500-7000 mm, 273 × 22 × 9000-9350 mm, 273 × 22 × 9000-9350 mm and 325 × 22 × 7100-7400 mm with hoods, respectively 5.07; 4.44; 5.32 and 5.28. In all cases, high-quality conversion pipes were obtained. The expenditure coefficient of the metal in the production of conversion pipes according to the existing technology was 2.062, and according to the proposed, depending on the method of expansion, from 1.432 to 1.518. The increase in the expenditure coefficient when rolling pipes of 325 × 22 mm in size is associated with an increase in the share of technological waste on the pilgrim mill (the weight of the pilgrim heads and seed ends) when rolling pipes from ingots of the same size, namely 430 × 1600-1700 mm. With an increase in the diameter of hot-rolled conversion pipes, according to the proposed method, the expenditure coefficient of metal from ingots with a larger weight should decrease by a large amount, because according to existing technology, a larger amount of metal went into shavings.

Thus, the table shows that according to the proposed method for the production of hot-rolled conversion pipes of size 273 × 22 and 325 × 22 mm from steel grade 06KHN28MDT at a pipe rolling unit 8-16, OAO ChTPZ reduced metal consumption by 544-630 kg per ton conversion tubes, the cost of which is much higher than the cost of expanding ESR drilled ingots into blanks-sleeves Using the proposed method for the production of hot-rolled conversion tubes of large and medium diameters from hard-deformed grades of steel and alloys on the pipe installations with pilgrim mills will significantly reduce metal consumption by eliminating the operation of boring ESR ingots into ingot sleeves, reduce the likelihood of defects in the form of flaws by using forged blank sleeves instead of ingot sleeves with an increased inner diameter, and reduce the load on the pilgrim drive mills by improving the descent of the pipe from the mandrel and reducing the coefficient of extraction, to eliminate breakage of spindles and rolls, and therefore, reduce the cost of conversion pipes from expensive ma rock steel and alloys.

Figure 00000001

Claims (1)

  1. A method for the production of hot-rolled conversion pipes of large and medium diameters from hard-to-deform grades of steel and alloys in tube-rolling plants with pilgrim mills, including drilling and boring ingots of ESR into hollow ingots-sleeves, whose inner diameter is 40-50 mm larger than the diameter of the mandrel of the pilgrim mill, heating them up to the ductility temperature and rolling of hollow ingots-shells on pilgrim mills into hot-rolled conversion tubes, characterized in that the ESR they are rolled into hollow blanks-sleeves with a hood μ = 1.2-1.8 without raising in diameter, grind and bore them to remove forging defects, heated to ductility temperature and rolled on pilgrim mills with hood μ≤5.0 or drilled ingots ESRs are expanded into hollow shell billets with a hood μ = 0.9-1.5, with a diameter increase of 1.05 to 1.4, then they are turned and bored to remove forging defects, heated to ductility temperature and rolled on pilgrim mills with hood μ≤5.5.
RU2003101009/02A 2003-01-14 2003-01-14 Method for producing hot rolled tubes of large and mean diameters of hard-to-form steels and alloys in tube rolling plants with pilger mills RU2242302C2 (en)

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Cited By (21)

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RU2523399C1 (en) * 2012-12-18 2014-07-20 Открытое акционерное общество "Челябинский трубопрокатный завод" Production of rerolled long-sized pipes from iron-nickel- and nickel-based alloys at pru with pilger mills
RU2527578C2 (en) * 2012-12-21 2014-09-10 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF SEAMLESS COLD-FORMED OIL-WELL TUBING SIZED TO 88,9×6,45×9000-10700 mm FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ-Ш" GRADE
RU2545950C2 (en) * 2013-03-12 2015-04-10 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF SEAMLESS COLD-FORMED OIL-WELL TUBING SIZED TO 168,3×10,6×5000-10000 mm
RU2553729C1 (en) * 2013-12-10 2015-06-20 Открытое акционерное общество "Челябинский трубопрокатный завод" Method of fabrication of seamless hot-rolled machined pipes with extended precision size 530(16 mm from steel grade "08x18h10t" for nuclear power facilities
RU2553727C1 (en) * 2013-12-05 2015-06-20 Открытое акционерное общество "Челябинский трубопрокатный завод" METHOD OF MANUFACTURING OF SEAMLESS HOT FINISHED MACHINED PIPES WITH SIZE ID489+3,0/-0×19,5+3,0/-0×4090+40/-0 AND ID489+3,0/-0×19,5+3,0/-0×2500+40/-30 mm OUT OF STEEL GRADE "38ХН3МФА" FOR BOTTLES MANUFACTURING
RU2554250C1 (en) * 2013-12-09 2015-06-27 Открытое акционерное общество "Челябинский трубопрокатный завод" Production of seamless hot-worked machined pipes with size 530(16 mm with increased accuracy out of steel grade "08x18h10t" for nuclear power engineering structures
RU2557390C1 (en) * 2013-12-09 2015-07-20 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF SEAMLESS HOT-STRAINED MACHINED HIGHER-STRENGTH 630×16 mm PIPES OF 08X18H10T-GRADE STEEL FOR NUCLEAR POWER PRODUCTION STRUCTURES
RU2557842C2 (en) * 2013-12-09 2015-07-27 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF SEAMLESS HOT-STRAINED MACHINED HIGHER-STRENGTH 630×16 mm PIPES OF 08X18H10T-GRADE STEEL FOR NUCLEAR POWER PRODUCTION STRUCTURES
RU2577884C2 (en) * 2014-05-15 2016-03-20 Открытое акционерное общество "Челябинский трубопрокатный завод" Method of producing pig pipe sizes 132,1(18 mm for manufacturing couplings cra-w brands hn30mdb
RU2613816C1 (en) * 2016-03-22 2017-03-21 Комаров Андрей Ильич METHOD OF PRODUCING COLD-DEFORMED COUPLING PIPES OF 132,1×18×10600-10800 mm SIZE FROM CORROSION-RESISTANT ALLOY OF KHN30MDB GRADE
RU2613813C1 (en) * 2016-03-22 2017-03-21 Комаров Андрей Ильич METHOD OF PRODUCING COLD-DEFORMED COUPLING PIPES OF 108×18 mm SIZE FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ" GRADE
RU2613807C1 (en) * 2016-03-22 2017-03-21 Комаров Андрей Ильич METHOD OF PRODUCING COLD-DEFORMED COUPLING PIPES OF 114,3×6,88 mm SIZE FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ" GRADE
RU2613809C1 (en) * 2016-03-22 2017-03-21 Комаров Андрей Ильич METHOD OF PRODUCING COLD-DEFORMED COUPLING PIPES OF 187,7×25×8300- 8500 mm FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ" GRADE
RU2613806C1 (en) * 2016-03-22 2017-03-21 Комаров Андрей Ильич METHOD FOR PRODUCING COLD-DEFORMED COUPLING PIPES OF 187,7×25×12300-12900 mm SIZE FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ" GRADE
RU2614477C1 (en) * 2016-03-22 2017-03-28 Комаров Андрей Ильич METHOD OF PRODUCING COLD-DEFORMED COUPLING PIPES OF 132,1 × 18 × 11.750-12.350 mm SIZE FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ" GRADE
RU2614476C1 (en) * 2016-03-22 2017-03-28 Комаров Андрей Ильич METHOD OF PRODUCING COLD-DEFORMED COUPLING PIPES OF 88,9 ×6,45 mm SIZE FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ-Ш" GRADE
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RU2615925C1 (en) * 2016-03-22 2017-04-11 Комаров Андрей Ильич METHOD OF PRODUCING COLD-DEFORMED COUPLING PIPES OF 114,3x6,88 mm SIZE FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ" GRADE
RU2615927C1 (en) * 2016-03-22 2017-04-11 Комаров Андрей Ильич METHOD OF COLD DRAWN TRADE PIPES MANUFACTURE OF 159x7x10000-11000 mm SIZE FROM TITANIUM ALLOYS PT-1M AND PT-7M
RU2617079C1 (en) * 2016-03-22 2017-04-19 Комаров Андрей Ильич Method of manufacturing seamless cold pipes of size 168,3x10,6x8,900-9,100 mm of corrosion-resistant alloy of "хн30мдб" grade
RU2639183C1 (en) * 2017-02-17 2017-12-20 Комаров Андрей Ильич METHOD OF PRODUCING SEAMLESS COLD-DEFORMED COUPLING PIPES OF 88,9 × 6,45 mm SIZE FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ-Ш" GRADE

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RU2523399C1 (en) * 2012-12-18 2014-07-20 Открытое акционерное общество "Челябинский трубопрокатный завод" Production of rerolled long-sized pipes from iron-nickel- and nickel-based alloys at pru with pilger mills
RU2527578C2 (en) * 2012-12-21 2014-09-10 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF SEAMLESS COLD-FORMED OIL-WELL TUBING SIZED TO 88,9×6,45×9000-10700 mm FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ-Ш" GRADE
RU2545950C2 (en) * 2013-03-12 2015-04-10 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF SEAMLESS COLD-FORMED OIL-WELL TUBING SIZED TO 168,3×10,6×5000-10000 mm
RU2553727C1 (en) * 2013-12-05 2015-06-20 Открытое акционерное общество "Челябинский трубопрокатный завод" METHOD OF MANUFACTURING OF SEAMLESS HOT FINISHED MACHINED PIPES WITH SIZE ID489+3,0/-0×19,5+3,0/-0×4090+40/-0 AND ID489+3,0/-0×19,5+3,0/-0×2500+40/-30 mm OUT OF STEEL GRADE "38ХН3МФА" FOR BOTTLES MANUFACTURING
RU2554250C1 (en) * 2013-12-09 2015-06-27 Открытое акционерное общество "Челябинский трубопрокатный завод" Production of seamless hot-worked machined pipes with size 530(16 mm with increased accuracy out of steel grade "08x18h10t" for nuclear power engineering structures
RU2557390C1 (en) * 2013-12-09 2015-07-20 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF SEAMLESS HOT-STRAINED MACHINED HIGHER-STRENGTH 630×16 mm PIPES OF 08X18H10T-GRADE STEEL FOR NUCLEAR POWER PRODUCTION STRUCTURES
RU2557842C2 (en) * 2013-12-09 2015-07-27 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF SEAMLESS HOT-STRAINED MACHINED HIGHER-STRENGTH 630×16 mm PIPES OF 08X18H10T-GRADE STEEL FOR NUCLEAR POWER PRODUCTION STRUCTURES
RU2553729C1 (en) * 2013-12-10 2015-06-20 Открытое акционерное общество "Челябинский трубопрокатный завод" Method of fabrication of seamless hot-rolled machined pipes with extended precision size 530(16 mm from steel grade "08x18h10t" for nuclear power facilities
RU2577884C2 (en) * 2014-05-15 2016-03-20 Открытое акционерное общество "Челябинский трубопрокатный завод" Method of producing pig pipe sizes 132,1(18 mm for manufacturing couplings cra-w brands hn30mdb
RU2613813C1 (en) * 2016-03-22 2017-03-21 Комаров Андрей Ильич METHOD OF PRODUCING COLD-DEFORMED COUPLING PIPES OF 108×18 mm SIZE FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ" GRADE
RU2613816C1 (en) * 2016-03-22 2017-03-21 Комаров Андрей Ильич METHOD OF PRODUCING COLD-DEFORMED COUPLING PIPES OF 132,1×18×10600-10800 mm SIZE FROM CORROSION-RESISTANT ALLOY OF KHN30MDB GRADE
RU2613807C1 (en) * 2016-03-22 2017-03-21 Комаров Андрей Ильич METHOD OF PRODUCING COLD-DEFORMED COUPLING PIPES OF 114,3×6,88 mm SIZE FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ" GRADE
RU2613809C1 (en) * 2016-03-22 2017-03-21 Комаров Андрей Ильич METHOD OF PRODUCING COLD-DEFORMED COUPLING PIPES OF 187,7×25×8300- 8500 mm FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ" GRADE
RU2613806C1 (en) * 2016-03-22 2017-03-21 Комаров Андрей Ильич METHOD FOR PRODUCING COLD-DEFORMED COUPLING PIPES OF 187,7×25×12300-12900 mm SIZE FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ" GRADE
RU2614477C1 (en) * 2016-03-22 2017-03-28 Комаров Андрей Ильич METHOD OF PRODUCING COLD-DEFORMED COUPLING PIPES OF 132,1 × 18 × 11.750-12.350 mm SIZE FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ" GRADE
RU2614476C1 (en) * 2016-03-22 2017-03-28 Комаров Андрей Ильич METHOD OF PRODUCING COLD-DEFORMED COUPLING PIPES OF 88,9 ×6,45 mm SIZE FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ-Ш" GRADE
RU2615924C1 (en) * 2016-03-22 2017-04-11 Комаров Андрей Ильич METHOD OF PRODUCING COLD-DEFORMED PIPES OF 88,9x6,45x9000-10700 mm SIZE FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ" GRADE
RU2615925C1 (en) * 2016-03-22 2017-04-11 Комаров Андрей Ильич METHOD OF PRODUCING COLD-DEFORMED COUPLING PIPES OF 114,3x6,88 mm SIZE FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ" GRADE
RU2615927C1 (en) * 2016-03-22 2017-04-11 Комаров Андрей Ильич METHOD OF COLD DRAWN TRADE PIPES MANUFACTURE OF 159x7x10000-11000 mm SIZE FROM TITANIUM ALLOYS PT-1M AND PT-7M
RU2617079C1 (en) * 2016-03-22 2017-04-19 Комаров Андрей Ильич Method of manufacturing seamless cold pipes of size 168,3x10,6x8,900-9,100 mm of corrosion-resistant alloy of "хн30мдб" grade
RU2639183C1 (en) * 2017-02-17 2017-12-20 Комаров Андрей Ильич METHOD OF PRODUCING SEAMLESS COLD-DEFORMED COUPLING PIPES OF 88,9 × 6,45 mm SIZE FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ-Ш" GRADE

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