RU2340417C2 - Method of preparation of billets for rolling of hot-rolled commerical and rerolled pipes of large and medium diameters from hardly-deformed grades of steel and alloys in tube-rolling plants with pilger rolling mills - Google Patents

Method of preparation of billets for rolling of hot-rolled commerical and rerolled pipes of large and medium diameters from hardly-deformed grades of steel and alloys in tube-rolling plants with pilger rolling mills Download PDF

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RU2340417C2
RU2340417C2 RU2005128218/02A RU2005128218A RU2340417C2 RU 2340417 C2 RU2340417 C2 RU 2340417C2 RU 2005128218/02 A RU2005128218/02 A RU 2005128218/02A RU 2005128218 A RU2005128218 A RU 2005128218A RU 2340417 C2 RU2340417 C2 RU 2340417C2
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ingots
hollow
metal
cartridges
pipes
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RU2005128218/02A
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Russian (ru)
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RU2005128218A (en
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нов Анатолий Васильевич Сафь (RU)
Анатолий Васильевич Сафьянов
Александр Анатольевич Фёдоров (RU)
Александр Анатольевич Фёдоров
Валентин Иреклеевич Тазетдинов (RU)
Валентин Иреклеевич Тазетдинов
Исаак Иосифович Вольберг (RU)
Исаак Иосифович Вольберг
Рашид Фасхеевич Нугуманов (RU)
Рашид Фасхеевич Нугуманов
Николай Григорьевич Дановский (RU)
Николай Григорьевич Дановский
Борис Семенович Литвак (RU)
Борис Семенович ЛИТВАК
Игорь Александрович Романцов (RU)
Игорь Александрович Романцов
Леонид Игнатьевич Лапин (RU)
Леонид Игнатьевич Лапин
Сергей Васильевич Ненахов (RU)
Сергей Васильевич Ненахов
Кирилл Николаевич Никитин (RU)
Кирилл Николаевич Никитин
Валерий Александрович Головинов (RU)
Валерий Александрович Головинов
Александр Юрьевич Матюшин (RU)
Александр Юрьевич Матюшин
Валерий Андреевич Логовиков (RU)
Валерий Андреевич Логовиков
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Открытое акционерное общество "Челябинский трубопрокатный завод"
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Abstract

FIELD: technological processes, metallurgy.
SUBSTANCE: method includes casting of hollow ingots with electroslag remelting, drilling of central opening with diameter of 100±5 mm, their heating to temperature of plasticity, volume expansion into hollow billets - cartridges with further turning and their boring into billets with removal of metal until forging defects are cleared with removal of metal, and value of metal removal is determined based on the following expressions Δ=K*D/S, Δ1=K1*D/S, where Δ - value of removed layer of metal during turning of hollow ingots-cartridges, mm; Δ1 - value of removed layer of metal during boring of hollow ingots-cartridges, mm; D - external diameter of hollow ingots-cartridges, mm; S - thickness of hollow ingots-cartridges walls, mm; K=0.3-0.4 - coefficient for determination of amount of removed metal layer during boring of ingots-cartridges, large amounts of which are related to steels with high content of alloying elements; K1=0.4-0.5 - coefficient for determination of amount of removed metal layer during boring of ingots-cartridges, high amounts of which are related to steels with high content of alloying elements; bottom part of hollow ingots-cartridges of electroslag remelting is removed with anode-mechanical cutting, value of which is determined based on expression L=K2*D/S, where K2=15-20 - coefficient for determination of value of removed bottom part of ingots-cartridges, high values of which are related to steels with high content of alloying elements.
EFFECT: expansion of assortment of pipes from hardly-deformed grades of steel and alloys on tube-rolling plants with Pilger rolling mills, reduction of metal consumption, lower possibility of defects creation in the form of skins and fissures, lower loads on drive of Pilger rolling mills, exclusion of spindles and ckrollers breakdown, reduction of cost of pipes production from expensive hardly-deformed grades of steel and alloys.
2 cl, 1 tbl

Description

The invention relates to pipe rolling production, and in particular to a method for preparing billets for rolling hot-rolled commodity and conversion pipes of large and medium diameters from hardly deformable steel grades and alloys in pipe rolling plants with pilgrim mills, and can be used in the preparation of billets from ingots-sleeves of electroslag remelting from steel and alloys of grades 08X18H10T, 12X18H12T, 08X17H15M3T, 10X23H18, 08X20H15C2, 10X17H13M2T, XH32, 09X14H13B2SR, 17X18H9, 08X22H6T, 08X10H16T2, 08X10H20MDN, 15HN, 15HN, 15HN, 15HN

In known tube-manufacturing method of preparation centrifugally cast hollow billet (turning and a boring) for the production of hot commodity and metal recycling pipes of large and medium diameter of tube installations for pilger stainless steels 08H18N12T, 08Cr18Ni10Ti, and 08H10N20T2 08H10N16T2 (TU 14-3- 569-77 "Centrifugally cast hollow tube blanks from steel grades 08X18H12T, 08X18H10T, 08X10H20T2 and 08X10H16T2 with a diameter of 530-650 mm", TU 14-3-1564-88 "Seamless hot-deformed pipes from steel of the grades 08X10H20T2 and 08X10H16T2, for extension TI 1 5 8-Tr. TB 1-6-94 "Production of pipes from steel grades 08X10H20T2 and 08X10H16T2 according to TU 14-3-1564-88", TU 14-3-743-78 "Seamless hot-rolled pipes from steel grade 08X18H12T", TI 158-Tr. TB1-63-98 "Production of seamless hot-rolled pipes from steel grade 08X18H12T for chemical engineering and for shirts of hydraulic cylinders of pilgerstan forgollers."

The disadvantage of this method is that centrifugally cast billets are turned and bored regardless of their geometrical dimensions with a tolerance of the outer and inner diameters of ± 3.0 mm with a surface roughness R z of not more than 80 μm. Pipes after rolling from these billets have a large number of defects on the outer and inner surfaces in the form of captivity, friability and require subsequent mechanical processing (turning and boring) with removal of metal 10-12 mm per side or 20-25 mm along the wall. Hot rolled pipes measuring 402 × 45 mm are machined and bored to a size of 377 × 20 mm, i.e. more than 50% of the metal goes into shavings. Since hot rolled pipes roll with thick walls, i.e. with small extracts (μ = 2.0-3.5), then large grains occur in the microstructure of the pipe metal, and therefore, the pipe metal has low mechanical properties and does not withstand intergranular corrosion tests (clause 2.8 TU 14-3- 765-78 states that the macrostructure of the metal of the pipes should be dense, without traces of shrinkage friability, delamination, cracks, voids), and the results of the initial tests for micro- and macrocontrol are final.

A known method for the preparation of centrifugal cast billets from steel grades 08X18H10T, 08X18H12T, including machining on the outer and inner surfaces with a roughness of not more than 80 μm according to GOST 2789-73, followed by etching (TU 14-3-561-77 "Centrifugal pipe blanks cast hollow from steel grades 08X18H10T and 08X18H12T "for the manufacture of pipes in tube-rolling plants with pilgrim mills according to TU 14-3-765-78" Seamless hot-rolled stainless steel pipes ", according to TU 14-3-1556-88" Seamless hot-rolled pipes from steel grades 08X18H12T and 08X18H10T for cryogenic ". After turning and boring on the outer and inner surfaces there should be no cracks, sinks, sand, sharp transitions and deep scratches, as well as dark spots of increased etchability with sharply defined boundaries. These defects should be removed by local repair to a depth of not more than 8 , 0 mm with a smooth transition along the boundaries of the place of stripping.The places of cutting or stripping of defects should be subjected to repeated etching with subsequent inspection (control). The macrostructure of turned and bored blanks should not contain cracks, sand, slag inclusions, gas bubbles, junctions and shrinkage friability.

The disadvantage of this method is that all sizes of centrifugally cast billets, regardless of the diameter and wall thickness, grind and bore with the removal of metal of the same size. After etching, defects on the outer surface are removed by local repair, and with a large number of defects by re-turning. On the inner surface, defects are monitored at the end macrotemplets with a width of 10-15 mm, which are selected from the rear ends of the workpieces (from the pouring side of the metal). The macrostructure of the blanks is evaluated by inspecting the templates with the naked eye. In the case of unsatisfactory results, from the rear ends of the workpieces, repeated rings are cut. A reassessment is final.

This type of control is biased, because defects on the inner surface of the workpieces can be anywhere, which can lead to the task of manufacturing blanks with defects on the inner surface and, as a result, to the rejection of hot-rolled pipes, as well as to the rejection of workpieces that can be saved by additional boring. Guaranteed (increased) metal removal during boring leads to increased metal consumption and additional laboriousness during boring, i.e. to the irrational use of metal and machine tools, and consequently, to the increased cost of hot-rolled pipes from hard-deformed grades of steel and alloys when redistributing a centrifugally cast billet - a hot-rolled pipe.

A well-known technical solution is the method of preparing blanks from ESR ingots for rolling hot rolled steel tubes from 20Kh25N25TYu-Sh steel with a size of 325 × 40 mm for the manufacture of water-cooled furnace rollers of 295 × 22 × 2750 mm in size, including drilling and boring of ESR ingots with a size of 480 × 1600 mm to a diameter of 285 + 5 / -0 mm, heating them to a temperature of plasticity, rolling on pilgrim mills into tubes of 325 × 40 mm in size on mandrels with an increased taper of 246/238 mm with a difference (gap) between the inner diameter of the bored shells and maxim with an overall diameter of mandrels equal to 40-45 mm, and an extraction coefficient μ = 3.4 (protocol No. 1031 for agreeing on the conditions for the supply of steel pipes of 20Kh25N25TYu-Sh grade dated 12/14/2000 and a letter indicating pilot-industrial rolling of hot-rolled conversion pipes of size 325 × 40 mm from steel grade 20X25H25TYu-Sh).

The disadvantage of this method is drilling at a diameter of 100 mm, followed by the boring of the ESR ingots into ingot sleeves with an inner diameter greater than the mandrel diameter 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 pipe, 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 closest technical solution is the method of preparing billets for rolling hot and large diameter pipes from hard-to-deform steel grades and alloys in pipe rolling plants with pilgrim mills, including drilling ESR ingots, heating to ductility temperature, followed by expansion into hollow billet blanks with hood μ = 1.2-1.8 without diameter rise, turning and boring them before removing forging defects or drilled ESP ingots are expanded into hollow shell blanks with a hood μ = 0.9-1.5 s lifting in diameter from 1.05 to 1.4, then grind and bore them to remove forging defects, which are used as blanks for the production of commodity and conversion pipes on injection molding machines with pilgrim mills (RF patent No. 2242302, class 7 B21B 21 / 04, 2004, bull. No. 35).

The disadvantages of this method are additional operations for drilling ESR ingots, heating them to a temperature of plasticity and expansion into hollow blanks on radial forging machines or presses, followed by removal of forging or press defects by turning and boring, which ultimately leads to significant metal consumption and increasing the cost of the finished product.

The objective of the proposed method for the preparation of billets for rolling hot-rolled commodity and conversion pipes of large and medium diameters from hard-to-deform grades of steel and alloys in tube-rolling plants with pilgrim mills is to eliminate the expensive operation of expanding EBP ingots into hollow billet sleeves followed by machining (turning and boring) into hollow billet blanks, reducing metal consumption during drilling of ingots and redistributing them into hollow billet blanks by expanding with subsequent turning and boring into hollow billets, and consequently, a reduction in the cost of hot-rolled commodity and conversion pipes of large and medium diameters from hard-deformed grades of steel and alloys.

The technical result is achieved by the fact that in the known method of preparing billets for rolling hot-rolled commodity and conversion pipes of large and medium diameters from hard-to-deform grades of steel and alloys in pipe rolling plants with pilgrim mills, including ingot casting by electroslag remelting (ESR), surface treatment until removal of forging defects , hollow ingots-sleeves are cast on ESR installations, which are turned and bored into hollow billets with metal removal, and the metal removal value is determined and expression Δ = K · D / S, Δ 1 = K 1 · D / S, where Δ - quantity of metal removed from the turning layer hollow ingot-liners, mm; Δ 1 - the value of the removed metal layer when boring hollow ingots, sleeves, mm; D is the outer diameter of the hollow ingots - sleeves, mm; S - wall thickness of hollow ingots - sleeves, mm; K = 0.3-0.4 - coefficient for determining the magnitude of the removed metal layer during turning of the ingots of liners, large values of which relate to steels with a high content of alloying elements; K 1 = 0.4-0.5 is the coefficient for determining the size of the metal layer to be removed when bore ingots-sleeves, large values of which relate to steels with a high content of alloying elements, and the bottom part of the hollow ingots-sleeves of electroslag remelting is removed by anode-mechanical cutting , the value of which is determined from the expression L = K 2 · D / S, where K 2 = 15-20 is the coefficient for determining the magnitude of the removed bottom of the shell-ingots, large values of which relate to steels with a high content of alloying elements, and at the ends of hollow blanks Compliant bottom ends of the ingot-liners, operate with the outer surface of a cone over a length L 1 = 2S of a dulling h> 2S t, where S z - thickness of wall hollow billets ESR, mm; S t - wall thickness of commodity pipes, mm

The profitable part 100-120 mm long is removed by anodo-mechanical cutting from the bottom end of hollow ESR ingot sleeves with a ratio D / S = 6.0-7.0 with a length of 2500-2700 mm (e.g. 540 × 80 × 2550 mm) refer to steels with a high content of alloying elements), and then they are turned and bored to remove scale and microcracks to a depth of 1.8-2.8 and 2.4-3.2 mm, depending on the size of the ingots and the content of alloying elements. After boring and turning at the bottom end of the ingot shells, to improve the seed conditions and reduce the seed trim, a cone is machined from the outer surface to a length of 130-210 mm with a blunting equal to or more than two wall thicknesses of the commodity pipes. Finished billets are heated to a temperature of plasticity (depending on the grade of steel) and fed to pilgrim mills for rolling.

A comparative analysis of the proposed solution with the prototype shows that the claimed method differs from the known one in that hollow ingots-sleeves are cast on ECB installations, which are turned and bored into hollow billets with metal removal, and the metal removal value is determined from the expressions Δ = K · D / S, Δ 1 = K 1 · D / S, where Δ is the value of the removed metal layer during turning of hollow ingots-shells, mm; Δ 1 - the value of the removed metal layer when boring hollow ingots, sleeves, mm; D is the outer diameter of the hollow ingots, sleeves, mm; S is the wall thickness of the hollow ingots, sleeves, mm; K = 0.3-0.4 is the coefficient for determining the magnitude of the metal layer to be removed when turning ingots-liners, large values of which relate to steels with a high content of alloying elements; K 1 = 0.4-0.5 is the coefficient for determining the size of the metal layer to be removed when bore ingots-sleeves, large values of which relate to steels with a high content of alloying elements, and the bottom part of the hollow ingots-sleeves of electroslag remelting is removed by anode-mechanical cutting , the value of which is determined from the expression L = K 2 · D / S, where K 2 = 15-20 is the coefficient for determining the magnitude of the removed bottom of the shell-ingots, large values of which relate to steels with a high content of alloying elements, and at the ends of hollow blanks Compliant bottom ends of the ingot-liners, operate with the outer surface of a cone over a length L 1 = 2S of a dulling h≥2S t, where S z - thickness of wall hollow billets ESR, mm; S t - wall thickness of commodity pipes, mm Thus, these differences allow us to conclude that the criterion of "inventive step" is met.

Comparison of the proposed method not only with the prototype, but also with other technical solutions in this technical field, did not reveal the features that distinguish the claimed method from the prototype, which corresponds to the patentability of "inventive step".

The method was tested on a pipe-rolling plant with 8-16 pilgrim mills of ChTPZ OJSC and a pilot plant of EShP of ZMZ OJSC (Zlatoust Metallurgical Plant). Four ESH ingots-sleeves 540 × 80 × 2500 mm in size 06ХН28МДТ steel were set for production, which were prepared (mechanically processed) in accordance with the claims in hollow billets, and two hollow billet blanks measuring 520 × 80 × 2600 mm, expanded to RCM from ESR ingots of 540 × 100 × 1750 mm in size.

Data on rolling commodity (GOST 9940) and conversion (GOST 9941) pipes of 377 × 15 and 377 × 40 mm in size on TPA 8-16 "with pilgrim mills made of 06KHN28MDT steel according to the existing and proposed technologies are shown in the table. The table shows, that according to existing technology, ingots with a size of 540 × 1750 mm were drilled to a diameter of 100 mm, and then rolled (unzipped) into hollow blanks-shells measuring 540 × 100 × 2800 mm on a radial forging machine, blanks were turned and bored to remove end sections in the workpiece size 520 × 80 × 2600 mm. They were heated in plastic furnaces to ductility temperature and rolled in a pilgrim mill to 377 × 40 mm conversion tubes with a drawing coefficient of 2.61.The metal consumption coefficient by this technology (ESR ingot - billet-sleeve-billet - billet pipe) was 1.844. of the proposed technology, hollow ESR ingots with dimensions of 540 × 80 × 2500 mm from the bottom end were cut to a length (L = 100 mm), and then bored and turned into blanks of 536 × 75 × 2400 mm in size (Δ = 2.0, a Δ 1 = 3.0 mm). From the bottom end, at a length equal to 28 (two wall thicknesses of ingot shells (160 mm), a cone with a blunting h≥2S t (in our case h = 40 mm) was made. Two hollow billets were heated to ductility temperature and rolled on a pilgrim stand in conversion pipes with a size of 377 × 40 mm bottom (shaped) end forward with a draw ratio of 2.57. The flow rate of the metal for these pipes (hollow ingot-sleeve - billet - conversion pipe) was 1.378. The other two hollow billets were heated to a temperature ductility and rolled on a pilgrim stand in commodity pipes (GOST 9940) with a size of 377 × 15 mm with the bottom end forward with a drawing coefficient of 6.37. The expenditure coefficient of the metal for these pipes (hollow ingot - sleeve - billet - commodity pipe) was 1.291.

Thus, the table shows that according to the proposed method of preparing billets for rolling hot-rolled commodity and conversion pipes of large and medium diameters from hard-deformed steel grades and alloys, 4 billets of 540 × 80 × 2500 mm in size were prepared in accordance with the claims. on TPA 8-16 "with pilgrim mills in the conversion (GOST 9941) size 377 × 40 mm and commodity (GOST 9940) pipes 377 × 15 mm in size made of 06ХН28МДТ steel. Using the proposed method for the production of hot-rolled commodity and of large and medium-diameter pipes of difficult to deform grades of steel and alloys in tube-rolling plants with pilgrim mills will significantly reduce metal consumption by eliminating the operation of drilling ESR ingots, turning and boring hollow core blanks into billets, and reduce the likelihood of formation of defects in the form of films and flaws due to the machining of hollow ingots-shells ESR into hollow billets, reduce the load on the drive of the pilgrim mills due to optimal deformation parameters, eliminate the floor spindles and rolls, and therefore, significantly reduce the cost of production of pipes from expensive difficult to deform steel grades and alloys on TPA with pilgrim mills.

Table Data on rolling of commodity (GOST 9940) and conversion (GOST 9941) pipes 377 × 15 and 377 × 40 mm in size on TPA 8-16 "with pilgrim mills made of 06KHN28MDT steel according to the existing and proposed technologies Type of technology Type of pipes steel grade Kolich. hollow blanks.-shells and ingots-shells The size of the original ingots and ingots-shells ESR ESW Ingot and Ingot Cases Dimensions of hollow workpieces The values of Δ, Δ 1 and L Pipe size Coeff. hoods for the pilgrim. become Pipes handed over Consumption. coefficient metal PC. mm kg mm mm mm μ m / kg - Existing Converting 06XH28MDT 2 540 × 1750 6290 520 × 80 ×
2600
Δ = 10
Δ 1 = 10
L = L 1 = 100
377 × 40 2.61

Figure 00000001
1,844 Proposed Converting 2 540 × 80 ×
2500
4564 536 × 75 ×
2400
Δ = 2.0
Δ 1 = 3.0
L-100
377 × 40 2,57
Figure 00000002
1,378 Commodity 2 540 × 80 ×
2500
4564 536 × 75 ×
2400
Δ = 2.0
Δ 1 = 3.0
L = 100
377 × 15 6.37
Figure 00000003
1,291

Claims (2)

1. A method of preparing billets for rolling hot-rolled commodity and conversion pipes of large and medium diameters from hard-to-deform grades of steel and alloys in pipe rolling plants with pilgrim mills, including casting ingots by electroslag remelting (ESR), surface treatment to remove forging defects, characterized in that ESR installations cast hollow ingots-sleeves, which are turned and bored into hollow billets with metal removal, and the metal removal value is determined from the expressions
Δ = K · D / S,
Δ 1 = K 1 · D / S,
where Δ is the value of the removed metal layer during turning of hollow ingots-shells, mm;
Δ 1 - the value of the removed metal layer when boring hollow ingots, sleeves, mm;
D is the outer diameter of the hollow ingots, sleeves, mm;
S is the wall thickness of the hollow ingots, sleeves, mm;
K = 0.3-0.4 - coefficient for determining the magnitude of the removed metal layer when turning the ingots of liners, large values of which relate to steels with a high content of alloying elements;
K 1 = 0.4-0.5 is a coefficient for determining the magnitude of the removed metal layer during the boring of ingot shells, large values of which relate to steels with a high content of alloying elements,
and the bottom of the hollow ingots-shells of electroslag remelting is removed by anodic-mechanical cutting, the value of which is determined from the expression
L = K 2 · D / S,
where K 2 = 15-20 is the coefficient for determining the magnitude of the removed bottom of the ingot shells, large values of which relate to steels with a high content of alloying elements.
2. The method according to claim 1, characterized in that at the ends of the hollow billets corresponding to the bottom ends of the ingot sleeves, a cone is made from the outer surface to a length L 1 = 2S 3 with blunting h≥25 t , where S 3 is the hollow wall thickness blanks electroslag remelting, mm;
S t - wall thickness of commodity pipes, mm
RU2005128218/02A 2005-09-09 2005-09-09 Method of preparation of billets for rolling of hot-rolled commerical and rerolled pipes of large and medium diameters from hardly-deformed grades of steel and alloys in tube-rolling plants with pilger rolling mills RU2340417C2 (en)

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RU2527560C2 (en) * 2012-09-10 2014-09-10 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF 550×25-30 mm SEAMLESS HOT-ROLLED PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERHIGH STEAM PARAMETERS OF "10Х9МФБ-Ш"-GRADE STEEL
RU2527587C2 (en) * 2012-09-14 2014-09-10 Открытое акционерное общество "Челябинский трубопрокатный завод" Production of 465×75 mm seamless hot-rolled pipes for steam boilers, steam pipelines and manifolds of plants with high and superhigh steam parameters from esr ingots of "10х9мфб-ш"-grade steel
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RU2516161C1 (en) * 2012-11-28 2014-05-20 Открытое акционерное общество "Челябинский трубопрокатный завод" Method to produce seamless pipes with size of 377h14-60 mm for steam boilers, steam lines and headers of plants with high and supercritical parameters of steam from steel of grade 10h9mfb-sh
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RU2514240C1 (en) * 2012-11-28 2014-04-27 Открытое акционерное общество "Челябинский трубопрокатный завод" Production of 530x25-60 mm seamless hot-rolled pipes for steam boilers, steam pipelines and manifolds of plants with high and superhigh steam parameters of "10х9мфб-ш"-grade steel
RU2523376C1 (en) * 2012-12-06 2014-07-20 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF 325×13-15 mm SEAMLESS HOT-ROLLED PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERHIGH STEAM PARAMETERS OF "10Х9МФБ-Ш"-GRADE STEEL
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RU2532873C2 (en) * 2012-12-19 2014-11-10 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF 377×14-19 mm SEAMLESS HOT-ROLLED PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERHIGH STEAM PARAMETERS OF "10Х9МФБ-Ш"-GRADE STEEL
RU2530087C2 (en) * 2012-12-21 2014-10-10 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF 465×15-60 mm SEAMLESS HOT-ROLLED PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERHIGH STEAM PARAMETERS FROM ESR INGOTS OF "10Х9МФБ-Ш"-GRADE STEEL
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RU2545925C2 (en) * 2013-03-19 2015-04-10 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF 426×15-60 mm SEAMLESS HOT-ROLLED PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERHIGH STEAM PARAMETERS OF "10Х9МФБ-Ш"-GRADE STEEL
RU2542139C1 (en) * 2013-07-16 2015-02-20 Открытое акционерное общество "Челябинский трубопрокатный завод" Method of manufacturing of pipes "t=279(36" and "t=346(40" mm out of "08-18=10t-+" grade steel for nuclear power facilities
RU2545969C2 (en) * 2013-07-16 2015-04-10 Открытое акционерное общество "Челябинский трубопрокатный завод" MANUFACTURING METHOD OF SEAMLESS HOT-ROLLED PIPES WITH DIMENSIONS OF 530×25-30 mm FOR STEAM BOILERS, STEAM LINES AND HEADERS OF PLANTS WITH HIGH AND SUPERCRITICAL STEAM PARAMETERS FROM STEEL GRADE "10Х9МФБ-Ш"
RU2570151C2 (en) * 2014-02-04 2015-12-10 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION SEAMLESS HOT-ROLLED 550×46-60 mm SIZE PIPES FOR BOILERS, STEAM LINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERCRITICAL STEAM PARAMETERS MADE OF "10Х9МФБ-Ш"-GRADE STEEL
RU2570152C2 (en) * 2014-02-04 2015-12-10 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF 550×25-30 mm SEAMLESS HOT-ROLLED PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERHIGH STEAM PARAMETERS OF "10Х9МФБ-Ш"-GRADE STEEL
RU2570154C2 (en) * 2014-02-18 2015-12-10 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF 377×20-60 mm SEAMLESS HOT-ROLLED PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERHIGH STEAM PARAMETERS OF "10Х9МФБ-Ш"-GRADE STEEL
RU2558319C1 (en) * 2014-05-15 2015-07-27 Открытое акционерное общество "Челябинский трубопрокатный завод" Method of production of seamless hot-worked boiler and steam line 530×30-75 mm pipes from "10х9к3в2мфбр-ш " grade refractory steel for power equipment with steam supercritical parameters
RU2564497C1 (en) * 2014-05-15 2015-10-10 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF SEAMLESS HOT-WORKED BOILER AND STEAM LINE 465×25-75 mm PIPES FROM "10Х9К3В2МФБР-Ш"-GRADE REFRACTORY STEEL FOR POWER EQUIPMENT WITH STEAM SUPERCRITICAL PARAMETERS
RU2567407C1 (en) * 2014-05-15 2015-11-10 Открытое акционерное общество "Челябинский трубопрокатный завод" METHOD OF PRODUCTION OF 325×16-25 mm SEAMLESS PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH CRITICAL AND SUPERCRITICAL STEAM PARAMETERS OF STEEL GRADE "10Х9МФБ-Ш"

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