RU2620204C1 - METHOD OF PRODUCING SEAMLESS MACHINED PIPES WITH 530 × 13-18 mm SIZE FROM STEEL OF "08Х18Н10-Ш" GRADE - Google Patents

METHOD OF PRODUCING SEAMLESS MACHINED PIPES WITH 530 × 13-18 mm SIZE FROM STEEL OF "08Х18Н10-Ш" GRADE Download PDF

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RU2620204C1
RU2620204C1 RU2016110303A RU2016110303A RU2620204C1 RU 2620204 C1 RU2620204 C1 RU 2620204C1 RU 2016110303 A RU2016110303 A RU 2016110303A RU 2016110303 A RU2016110303 A RU 2016110303A RU 2620204 C1 RU2620204 C1 RU 2620204C1
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size
pipes
rolling
diameter
ingot
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RU2016110303A
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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
    • B21B19/00Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling Diescher mills, Stiefel disc piercers, Stiefel rotary piercers
    • B21B19/06Rolling hollow basic material, e.g. Assel mills

Abstract

FIELD: metallurgy.
SUBSTANCE: invention relates to the method of producing seamless machined pipes with 530×13-18 mm size from steel of "08Х18Н10-Ш" grade. The method includes casting hollow ingots by electroslag remelting size of 670×in.280×1750±50 mm, boring and turning them into hollow cakes with 650×in.300×1750±50 mm, heating ingot-blanks in the process furnace to a temperature of 1250-1260°C, the issuance of ingot-blanks from the furnace, lubrication from two ends of ingot-blanks with a mixture of graphite and common salt in a ratio of 50/50 mass equal to 1000-1250 g, piercing-rolling of ingot-blanks in the mill of cross-screw rolling into sleeves of size 680×in.515×2800-2970 mm, rolling bushing on PPP 8-16" with pilgrim mills in disposal pipe size of 550×35×5700-6100 mm, line of technological waste seed ends and pilgrim heads saw hot cutting, editing the correct six-high machine, austenization, machining-boring and refacing metal recycling hot-rolled pipes measuring 550×35×5700-6100 mm in pipe size 530×13-18×5700-6100 mm.
EFFECT: reduction of a metal consumption coefficient.
2 cl, 1 tbl

Description

The invention relates to pipe rolling production, and in particular to a method for the production of seamless hot rolled machined pipes of 530 × 13-18 mm in size for nuclear power facilities from steel grade 08Kh18N10-Sh, and can be used on TPU 8-16 '' with pilgrim mills in production hot rolled tubes 550 × 35 × 5700-6100 mm in size from hollow ingots-blanks of electroslag remelting 650хвн. 300 × 1750 ± 50 mm in size, for subsequent machining - boring and turning them into commodity pipes of 530 × 13-18 × 5700- 6100 mm.

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 from the rolls, the speed is increased to 35-40 rpm, the firmware-rolling process and (the second firmware) from capturing the billet sleeve to being completely on the mandrel, they lead 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. 2247612, 03/10/2005, bull. No. 7).

The disadvantage of this method is that it is aimed at the production of commodity mechanically processed pipes and does not stipulate the allowance for machining of conversion pipes for the manufacture of commodity mechanically processed pipes of high quality from corrosion-resistant steel 08X18H10-Sh for nuclear power facilities.

In the pipe industry, a method is known for the production of seamless hot-formed mechanically machined pipes of 245 × 19, 351 × 36, 415 × 50, 426 × 40, 426 × 50 and 436 × 45 mm sizes from ESR ingots-blanks of 08X18H10T-Sh corrosion-resistant steel for nuclear power facilities with a bored inner and turned outer surface with a roughness of not more than R a 10 microns in accordance with GOST 2789 (TU 14-158-131-2002 "Hot-deformed pipes of high-quality corrosion-resistant steel").

The disadvantage of this method is that it is aimed at the production of commodity machined pipes with relatively thick walls. In the production of pipes of these sizes with a length of at least 4000 mm, the allowance for machining (boring and turning) should be at least 10 mm per side. Thus, during machining (boring and turning) with a roughness of not more than R a 10 μm, 111.5 to 227.1 kg of expensive metal, i.e. from 35.0 to 55.0% (depending on the diameter and wall thickness).

In the pipe industry, a method is known for the production of seamless hot-formed mechanically machined pipes with a diameter of 530-550 mm from corrosion-resistant hard-deformed steel grades and alloys on TPU 8-16 '' with pilgrim mills, including casting ESR ingots 610 × 1725 ± 25 mm in size, machining - turning of ingots into ingots-blanks of size 590 ± 5.0 × 1725 mm, drilling in blanks of a central hole with a diameter of 100 ± 5.0 mm, boring of ingots-blanks to a size of 590 ± 5.0хвн. 220 ± 5.0 × 1750 ± 25 mm, heating ingots to a temperature of the layer In particular, piercing in a cross-helical rolling mill into billet sleeves of size 620хvn. 365 × 1950-2000 mm on a mandrel with a diameter of 350 mm with a diameter rise of δ = 4.0-6.0%, heating of the billet blanks from cold or hot Posada to plasticity temperature, firmware-rolling in a cross-helical rolling mill into sleeves measuring 660 × 505-515 × 2950-3100 mm on a mandrel with a diameter of 490-500 mm with a rise in diameter of δ = 5.5-6.5%, rolling thermowells on TPU 8-16 '' with pilgrim mills in redacting pipes with a diameter of 530-550 mm with a ratio D / S = 13.5-15.0 with an allowance for wall thickness for mechanical work - boring and turning, determining the thicknesses of the removed metal layers during turning and boring from the expressions Δ = D / S * K, Δ 1 = D / S * K 1 , where Δ is the thickness of the removed metal layer when turning hot-rolled pipes on the outer surface mm; Δ 1 - the thickness of the removed metal layer when boring hot rolled pipes on the inner surface, mm; D is the outer diameter of the hot rolled pipes, mm; S is the wall thickness of the hot rolled pipes, mm; K = 0.5-0.7 - coefficient for determining the thickness of the removed metal layer when turning pipes, large values of which apply to pipes with thicker walls; K 1 = 0.4-0.5 is a coefficient for determining the thickness of the metal layer to be removed when boring pipes, large values of which relate to pipes with thicker walls (Patent No. 2387501, publ. July 27, 2010, bull. No. 12).

The disadvantage of this method is that it solves the general issues of the production of seamless hot-deformed pipes from corrosion-resistant hard-deformed steel grades and alloys with a ratio of D / S = 13.5-15.0 for subsequent machining - boring and turning them into commodity pipes with a diameter of 530-550 mm with a wall thickness of more than 20 mm, a length of not more than 4700 mm and does not solve the technological issues of the production of commodity mechanically processed pipes of 530 × 13-18 mm in size from steel grade 08X18H10-Sh of increased accuracy in diameter and wall for nuclear power facilities.

In the pipe industry, there is also a known method for producing high-quality pipes from a corrosion-resistant 08Kh18N10T-Sh brand for nuclear power facilities, which includes casting ingots by electroslag remelting, turning ingots into ingot billets, drilling in central billet ingots with a diameter of 100 ± 5 mm, heating ingot blanks up to ductility temperature, piercing ingot blanks in a cross-helical rolling mill into sleeves, rolling sleeves at TPU with pilgrim mills into hot rolled pipes, length t technological waste - pilgrim heads and seed ends with a hot cutting saw, straightening pipes, heat treatment - austenization, machining of 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 = KΔS ce VS, NP = K ΔS 1 ΔS ns where ΔS ce - the quantity of metal removed layer in the bore under the process roll, mm; ΔS century - the size of the removed metal layer when boring to the finished size, mm; K = (0.5-0.6) - coefficient of reduction in the size of the removed metal layer during boring, large values of which relate to pipes of large diameters; ΔS n.p - the value of the removed metal layer during turning to the finished size, mm; K 1 = (0.4-0.5) 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 CPT mills into commodity pipes with a roughness of the outer and inner planes of not more than R a 2.5 μm (RF patent No. 2401169, CL B21B 21/00, 10/10/2010, bull. No. 28).

The disadvantage of this method is that it is aimed at the production of hot-rolled conversion tubes for each size of commodity machined and cold-rolled pipes, which in turn leads to an increase in the technological tool when rolling conversion hot-rolled pipes to TPU with pilgrim mills (mandrels of cross-helical rolling mills , rolls and mandrels of pilgrim mills). Rolling of hot-rolled chimneys for each size of commodity machined and cold-rolled pipes leads to additional transshipment at TPU with pilgrim mills and a decrease in its productivity.

The closest technical solution (prototype) is a method for the production of seamless hot-deformed long pipes with a diameter of 500 mm 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; N = (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 plasticity temperature and rolled they are fed into pipes with a D / S≥20 ratio with a diameter tolerance of ± 1.0% and a wall thickness of + 15.0 / -10.0%, hollow ingots of electroslag remelting for rolling boiler pipes with a D / S≤ ratio 20 are cast with an internal 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 - roll out in a cross-rolling mill in sleeves on a mandrel with a diameter larger than the mandrel diameter are 15–20 mm and rolled on a pilgrim mill in pipes with a D / S ratio of ≤20 with a tolerance of ± 1.0% in diameter and + 15.0 / -10.0% in wall thickness.

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 machined pipes of 530 × 13-18 mm in size from steel grade 08X18H10-Sh for nuclear power facilities.

The objective of the proposed method is the development of the production of seamless machined pipes with a size of 530 × 13-18 mm for nuclear power facilities from steel grade 08X18H10-Sh from hot-rolled steel billets of 550 × 35 × 5700-6100 mm in size, rolled at 8-16 'TPU '' with pilgrim mills from hollow ingot billets EShP size 650hvn. 300 × 1750 ± 50 mm, reduction of the expenditure coefficient of the metal when redistributing the hollow ingot billet EShP - commodity pipe made of corrosion-resistant steel grade 08X18H10-Sh according to TU 14-3R-197 -2001 for nuclear facilities and industrial facilities performance increase of TPU 8-16 '' during rolling of hot rolled tubes.

The technical result is achieved by this method for the production of seamless machined pipes with a size of 530 × 13-18 mm for nuclear power facilities made of steel grade 08X18H10-Sh, including the casting of hollow ingots by electroslag remelting of size 670хвн. 280 × 1750 ± 50 mm, boring and turning them into hollow ingot blanks with a size of 650 × Hv. 300 × 1750 ± 50 mm, heating ingot blanks in a methodical furnace to a temperature of 1250-1260 ° C, dispensing ingot ingots from a furnace, lubrication from two ends of ingot blanks with a mixture of graphite and sodium chloride in a ratio of 50 / 50 mass = 1000 -1250 g, firmware rolling of ingot billets in a cross-helical rolling mill on a mandrel with a diameter of 500 mm with drawing coefficients μ 2 = 1.65, and a rise in diameter of δ = 4.62% into sleeves measuring 680хvn. 515 × 2800- 2970 mm, rolling of sleeves on TPU 8-16 '' with pilgrim mills on conical mandrels with a diameter of 483/489 mm in caliber 562 mm, cut into rolls with a barrel diameter of 1150 mm, with an angle of transverse release on the polishing section α a.s. = 26 ° into conversion pipes with a size of 550 × 35 × 5700-6100 mm with a drawing coefficient μ 2 = 2.74, compression in diameter of 19.12%, with the supply of sleeves into the deformation zone m = 20-24 mm, a segment of technological waste - seed ends and pilgrim heads with a hot cutting saw, straightening in a six-roll straightening machine using rolling heating temperature for 2-3 passes to a curvature of not more than 6.0 mm for the total length of pipes, heat treatment of pipes - austenization, machining - boring and turning hot-rolled pig tubes with a pipe size of 550 × 35 × 5700-6100 mm into commodity pipes with a size of 530 × 13-18 × 5700-6100 mm, and the machining of pig-iron pipes with a size of 550 × 35 × 5700-6100 mm is first made into commodity pipes with a size of 530 × 18, but we load into pipes 530 × 17, 530 × 16, 530 × 15, 530 × 14 and 530 × 13 mm.

A comparative analysis of the proposed solution with the prototype shows that the claimed method differs from the known one in that hollow ingots are cast using electroslag remelting of size 670хвн.280 × 1750 ± 50 mm, boring and turning them into hollow ingots-blanks of size 650хвн.300 × 1750 ± 50 mm heating the ingot billets in a methodical furnace to a temperature of 1250-1260 ° C; dispensing ingot billets from the furnace; the task of lubricating two ends of the ingot from a mixture of graphite with sodium chloride in a ratio of 50/50 weight = 1000-1250 g, firmware rolling of ingot blanks in a hundred e helical rolling with coefficients on a mandrel of 500 mm diameter hoods μ 2 = 1.65 and the rise of the diameter δ = 4,62% in the size of the sleeve 680hvn.515 × 2800-2970 mm, the rolling of sleeves in TPU 8-16 ' with pilgrim mills on conical mandrels with a diameter of 483/489 mm in caliber 562 mm, cut into rolls with a barrel diameter of 1150 mm, with an angle of transverse release at the polishing section α a.s. = 26 °, into redistributed pipes of 550 × 35 × 5700- 6100 mm with a drawing coefficient μ 2 = 2.74, compression in diameter of 19.12%, with the supply of sleeves to the deformation zone m = 20-24 mm, a piece of process waste - seed to ends and pilgrim heads with a hot cutting saw, straightening in a six-roll straightening machine using rolling heating temperature for 2-3 passes to a curvature of not more than 6.0 mm for the total pipe length, heat treatment of pipes - austenization, machining - boring and turning of hot rolled pipes with a pipe size of 550 × 35 × 5700-6100 mm into commodity pipes with a size of 530 × 13-18 × 5700-6100 mm, and machining of conversion pipes with a size of 550 × 35 × 5700-6100 mm is first carried out into commodity pipes with a size of 530 × 18, and then into product pipes 530 × 17, 530 × 16, 530 × 15, 530 × 14 530 × 13 mm.

A method for the production of seamless hot-rolled machined pipes 530 × 15 mm in size for nuclear power facilities made of 08Kh18N10-Sh steel according to the proposed technology (method) was carried out at Chelyabinsk Tube-Rolling Plant OJSC at a tube-rolling installation with 8-16 pilgrim mills during rolling process pipes with a size of 550 × 35 × 6100 mm from hollow ingot blanks EShP with a size of 650xvn. 300 × 1800 mm, followed by boring and turning them into commodity machined pipes with a size of 530 × 15 × 6100 mm. Since pipes of this size and assortment have not yet been produced in Russia, comparative rolling is not shown. Data on the technological parameters of the production of seamless hot-rolled machined pipes of 530 × 15 mm in size from steel grade 08Kh18N10-Sh for nuclear power facilities are shown in Table 1.

Figure 00000001

It can be seen from the table that 2 ingot billet with a size of 650xvn. 300 × 1800 mm with a total weight of 7210 kg were set into production. The ingot billets were heated in a methodical furnace to a temperature of 1250-1260 ° C, stitched-rolled in a cross-helical mill on mandrels with a diameter of 500 mm with a hood μ = 1.65 and a rise in diameter of δ = 4.62% in sleeves of size 680hvn. 515 × 2970 mm. The sleeves are rolled at 8-16 '' TPU with pilgrim mills in caliber 562 mm with an angle of transverse release at the polishing section of α a.s. on conical mandrels with a diameter of 483/489 mm with a hood μ = 2.74, compression in diameter of 19.12%, with feeds of sleeves into the deformation zone m = 22-24 mm. Technological wastes were cut off - seed ends and pilgrim heads were made using a hot cutting saw, and straightening in a six-roll straightening machine was carried out using rolling heating temperature for 2-3 passes to the curvature of not more than 6.0 mm for the total length of the pipes. Heat treatment of pipes - austenization, machining - boring and turning of hot rolled pipes of size 550 × 35 × 6100 mm was made into commodity pipes of size 530 × 15 × 6100 mm. The pipes were accepted for compliance with the requirements of TU 14-3R-197-2001. In accordance with TU 14-3R-197-2001, 12.2 m of pipes with a size of 530 × 15 mm with a total weight of 2323 kg were adopted. The expenditure coefficients of the metal in the pipes of this batch amounted to 3.104.

Thus, the use of the proposed method made it possible for the first time in world practice to manufacture hot rolled steel tubes of 550 × 35 × 6100 mm in size on TPU 8-16 '' from hollow ingot blanks EShP steel 08Kh18N10-Sh with dimensions 650hvn. 300 × 1800 mm, for the subsequent machining - boring and turning them into commodity pipes measuring 530 × 15 mm for nuclear facilities.

Claims (2)

1. Method for the production of seamless hot-rolled machined pipes 530 × 13-18 mm in size from 08Kh18N10-Sh steel, including the casting of hollow ingots by electroslag remelting of 670hvn. 280 × 1750 ± 50 mm in size, boring and turning them into 650hvn hollow ingots .300 × 1750 ± 50 mm, heating the ingot blanks in a methodical furnace to a temperature of 1250-1260 ° C, dispensing ingot blanks from the furnace, lubricating the two ends of the ingot blanks with a mixture of graphite and sodium chloride in a ratio of 50/50 weight = 1000 -1250 g, firmware rolling of ingot billets in the mill transversely intovoy rolling on the mandrel diameter of 500 mm with a stretching ratio μ 2 = 1.65 and the rise of the diameter δ = 4,62% in the size of the sleeve 680hvn.515 × 2800-2970 mm, rolling the sleeves at 8-16 TPU "in a pilger cone mandrels with a diameter of 483/489 mm in caliber 562 mm, cut into rolls with a barrel diameter of 1150 mm, with an angle of transverse release at the polishing section α a.s. v = 26 °, into conversion pipes of 550 × 35 × 5700-6100 mm in size with a coefficient hoods μ 2 = 2.74, compression in diameter 19.12%, with the supply of sleeves into the deformation zone m = 20-24 mm, a piece of technological waste - seed ends and pilings hot-cut saws of Roman heads, 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, machining - boring and turning of hot rolled steel tubes of 550 × 35 × 5700-6100 mm in commodity pipes measuring 530 × 13-18 × 5700-6100 mm.
2. The method according to p. 1, characterized in that the machining of the conversion pipes with a size of 550 × 35 × 5700-6100 mm is carried out first in commodity pipes of 530 × 18 size and then in commodity pipes of 530 × 17, 530 × 16, 530 × 15, 530 × 14 and 530 × 13 mm.
RU2016110303A 2016-03-22 2016-03-22 METHOD OF PRODUCING SEAMLESS MACHINED PIPES WITH 530 × 13-18 mm SIZE FROM STEEL OF "08Х18Н10-Ш" GRADE RU2620204C1 (en)

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Citations (5)

* 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
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
RU2387501C2 (en) * 2007-12-24 2010-04-27 ОАО "Челябинский трубопрокатный завод" FABRICATION METHOD OF SEAMLESS HOT-DEFORMED MECHANICALLY TREATED TUBES WITH DIAMETRE OF 530-550 mm FROM CORROSION-RESISTANT DIFFICULT-TO-FORM GRADES OF STEEL AND ALLOYS ON TUBE-FORMING INSTALLATION 8-16" WITH PILGER MILLS
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 (5)

* 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
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
RU2387501C2 (en) * 2007-12-24 2010-04-27 ОАО "Челябинский трубопрокатный завод" FABRICATION METHOD OF SEAMLESS HOT-DEFORMED MECHANICALLY TREATED TUBES WITH DIAMETRE OF 530-550 mm FROM CORROSION-RESISTANT DIFFICULT-TO-FORM GRADES OF STEEL AND ALLOYS ON TUBE-FORMING INSTALLATION 8-16" WITH PILGER MILLS
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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