RU2615394C1 - METHOD FOR PRODUCING SEAMLESS PIPES OF 325×8-14 mm SIZE MADE OF STEEL OF "08X18Н10Т-Ш" GRADE - Google Patents

METHOD FOR PRODUCING SEAMLESS PIPES OF 325×8-14 mm SIZE MADE OF STEEL OF "08X18Н10Т-Ш" GRADE Download PDF

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RU2615394C1
RU2615394C1 RU2016110183A RU2016110183A RU2615394C1 RU 2615394 C1 RU2615394 C1 RU 2615394C1 RU 2016110183 A RU2016110183 A RU 2016110183A RU 2016110183 A RU2016110183 A RU 2016110183A RU 2615394 C1 RU2615394 C1 RU 2615394C1
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pipes
size
ingot
rolling
blanks
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RU2016110183A
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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 hollow ingots by electroslag remelting, their refacing into ingot workpieces, ingot workpieces heating in the reheating furnace, lubricating, supply of hollow ingot workpieces on the front side of the Pilger mill, their rolling at the Pilger mill, straightening, pipes cutting into two pipe of equal length, mechanical processing-boring and turning into the tube stock workpieces and rolling of mechanicalyy procedded tube stock workpieces on KhPT 450 mill into trade pipes.
EFFECT: reduced expensive metal consumption, reduced roughness of outer and inner pipes surfaces, improved productivity and increased pipes lengths, reduced cost provided by regulation of workpieces processing modes at all stages of production.
2 cl, 1 tbl

Description

The invention relates to pipe rolling production, and in particular to a method for the production of seamless cold-rolled pipes with a size of 325 × 8-14 mm for nuclear power facilities made of steel grade 08X18H10T-Sh, and can be used on TPU 8-16 '' with pilgrim mills in the manufacture of conversion tubes with a size of 490 × 40 × 8350-8650 mm from hollow ingots-blanks of electroslag remelting with a size of 650 × ext. 440 × 3200 ± 50 mm, for subsequent machining - boring and turning - them into conversion pipes of 474 × 20, 474 × 22, 474 × 24, 474 × 26 mm and roll them at the mill ХПТ 450 in commodity e pipe size 325 × 8-14 mm.

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

The disadvantage of this method is that it is acceptable only for the production of hot-rolled commodity and conversion pipes of medium diameter, namely pipes with a diameter of 219-325 mm, because for rolling pipes with a diameter of more than 325 mm, a blank or ingot-blank of ESR with a diameter of 540-620 mm is required, which, due to the low power of the drive of the cross-helical rolling mill, cannot be sewn, and most importantly, this method does not stipulate machining allowance - boring and turning - conversion tubes for the manufacture of commodity pipes 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 also 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 the ductility temperature, 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 15-25 rpm, and the second and subsequent, if necessary, rolling-ups 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 insert of shell blanks into the furnace, the process of flashing from capturing ingots-blanks of ESR or blanks until they are 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 the output the sleeve blanks of their rolls, the number of revolutions is increased to 35-40 rpm, the firmware process is p rolling (the second firmware) from capturing the billet sleeve to being completely on the mandrel is carried out with a decrease in the number of revolutions of the work rolls from 50 to 20, the steady rolling process at 20-25 rpm, and at the exit of the sleeve from the rolls the speed is increased to 45- 50, and pipe rolling on a pilgrim mill is carried out with an extractor μ = 3.0-5.0 (RF patent No. 2247612, bull. No. 7, 03/10/2005).

The disadvantage of this method is that it is aimed at the production of commodity machined pipes and also does not stipulate the allowance for machining of conversion pipes for the manufacture of commodity machined pipes of high quality with a size of 245 × 19, 351 × 36 and 426 × 40 mm from corrosion-resistant steel 08Х18Н10Т-Ш for nuclear facilities.

In pipe production, there is also known a 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 the ingots into ingot ingots, 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, a section of those of biological 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 tracking system, into steel blanks with metal removal, the value of which is determined from expression: 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 under the technological roll, mm; ΔS ns - 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 microns.

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 or more on pipe rolling plants with pilgrim mills for steam boilers, steam pipelines and manifolds of plants with high and supercritical steam parameters (RF patent No. 2322315, class V21V 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) - values of the coefficients 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 are cast with an inner diameter of D int = 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-billets of electroslag remelting are heated to plasticity temperature and rolled they are hollowed into a pipe 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 pipes with a size of 325 × 8-14 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 of high quality with a size of 325 × 8-14 mm of increased length from conversion tubes-blanks of size 474 × 20-26 × 4175-4325 mm obtained by machining - boring and turning of hot-rolled pipes of size 490 × 40 × 8350-8650 mm, rolled on TPU 8-16ʺ with pilgrim mills from ESW hollow ingots-billets of size 650 × ext. 440 × 3200 × ± 50 mm, reduction of the metal consumption coefficient during redistribution of the ESW hollow ingot-billet-commodity pipe from corrosion -resistant steel 08X18 10T-WB-TU 14-3R 197-2001 for nuclear power facilities and productivity TPU 8-16" during rolling of mother tubes.

The technical result is achieved through the use of a method for the production of seamless pipes with a size of 325 × 8-14 mm for nuclear power facilities from steel grade 08X18H10T-Sh, including the casting of hollow ingots by electroslag remelting with a size of 670 × ext. 420 × 3200 ± 50, turning them into ingots blanks of size 650 × ext. 440 × 3200 ± 50 mm, heating of ingot blanks in a methodical furnace to a temperature of 1250-1260 ° C, delivery of ingot blanks from the furnace to an ingot cart, blowing of ingot blanks with compressed air, feeding of ingot blanks from two ends to 2000-2500 g of grease in ide of graphite with table salt in a ratio of 50/50 mass, feeding hollow ingot blanks with a crane to the inlet side of the pilgrim mill, rolling them in a pilgrim mill on conical mandrels with a diameter of 412/418 mm in a caliber 498 mm, cut into rolls with a barrel diameter of 1150 mm , with an angle of transverse release at the polishing section α P. vyp = 24-26 °, into conversion pipes with a size of 490 × 40 × 8350-8650 mm with a drawing coefficient μ p = 3.12 and compression in diameter Δ = 24.62%, with the supply of hollow ingots-billets into the deformation zone m = 25-27 mm, a piece 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 per length of a conversion pipe, austenization, pipe cutting into two pipes of equal length, machining - boring and turning into conversion billet pipes of sizes 474 × 26 × 4175-4325, 474 × 24 × 4175-4325, 474 × 22 × 4175-4325 and 474 × 20 × 4175-4325 mm, rolling of mechanically processed conversion billets at the KhPT mill 450 to the goods pipes along the routes: 474 × 20 × 4175-4325 - 426 × 16 × 5400-5650 - 377 × 12 × 7750-8100 - 325 × 8 × 13000-13700 and 325 × 9 × 11600-12100 mm with drawing coefficients μ 1.38, 1.50, 1.73 and 1.54, respectively; 474 × 22 × 4175-4325 - 426 × 18 × 5300-5500 - 377 × 14 × 7300-7600 - 325 × 10 × 11400-11900 and 325 × 11 × 10400-10800 mm with drawing coefficients μ respectively 1.35, 1 45, 1.61 and 1.47; 474 × 24 × 4175-4325 - 426 × 20 × 5200-5400 - 377 × 16 × 7000-7300 - 325 × 12 × 10400-10900 and 325 × 13 × 9600-10000 mm with drawing coefficients μ respectively 1.33, 1 41, 1.54 and 1.42; 474 × 26 × 4175-4325 - 426 × 22 × 5100-5350 - 377 × 18 × 6600-7000 - 325 × 14 × 9400-10000 mm with drawing coefficients μ respectively 1.31, 137 and 1.48.

At the same time, the semantic value of the signs characterizing the diameter of the conical mandrels is 412/418 mm, it should be understood how the first of the indicated diameter values refers to the front section of the mandrel, and the second - the diameter of its rear section.

A comparative analysis of the proposed solution with the prototype shows that the claimed method differs from the known one in that they produce casting of hollow ingots by electroslag remelting of size 670 × vn. 420 × 3200 ± 50, turning them into ingots-blanks of size 650 × vn. 440 × 3200 ± 50 mm, heating ingot billets in a methodical furnace to a temperature of 1250-1260 ° C, dispensing ingot billets from the furnace to an ingot trolley, blowing ingot billets with compressed air, supplying ingot billets from both ends with 2000-2500 g of lubricant in the form of graphite with table salt in the ratio 50/50 mass, feeding hollow ingots to the inlet side of the pilgrim mill, rolling them in a pilgrim mill on conical mandrels with a diameter of 412/418 mm in a caliber 498 mm, cut into rolls with a barrel diameter of 1150 mm, with a transverse outlet angle on the polishing p.vyp portion α = 24-26 °, in steel making pipe size 490 × 40 mm × 8350-8650 coefficient μ drawing n = 3.12 and swaging diameter Δ = 24,62%, feed hollow ingot billets in deformation zone m = 25-27 mm, a piece of technological waste - seed ends and pilgrim heads - a hot cutting saw, dressing in a six-roll straightening machine using rolling heating temperature for 2–3 passes to a curvature of not more than 6.0 mm per length of a conversion pipe, austenization, pipe cutting into two pipes of equal length, machining - boring and turning into conversion blanks of size 474 × 26 × 4175-4325, 474 × 24 × 4175-4325, 474 × 22 × 4175-4325 and 474 × 20 × 4175-4325 mm, rolling mechanically processed conversion pipes at the KhPT 450 mill into commodity pipes along the routes: 474 × 20 × 4175-4325 - 426 × 16 × 5400-5650 - 377 × 12 × 7750-8100 - 325 × 8 × 13000-13700 and 325 × 9 × 11600-12100 mm with drawing coefficients μ respectively 1.38, 1.50, one 73 and 1.54; 474 × 22 × 4175-4325 - 426 × 18 × 5300-5500 - 377 × 14 × 7300-7600 - 325 × 10 × 11400-11900 and 325 × 11 × 10400-10800 mm with drawing coefficients μ respectively 1.35, 1 45, 1.61 and 1.47; 474 × 24 × 4175-4325 - 426 × 20 × 5200-5400 - 377 × 16 × 7000-7300 - 325 × 12 × 10400-10900 and 325 × 13 × 9600-10000 mm with drawing coefficients μ respectively 1.33, 1 41, 1.54 and 1.42; 474 × 26 × 4175-4325 - 426 × 22 × 5100-5350 - 377 × 18 × 6600-7000 - 325 × 14 × 9400-10000 mm with drawing coefficients μ respectively 1.31, 137 and 1.48.

The machining of hot rolled steel tubes with a size of 490 × 40 × 4175-4325 mm is carried out first in a machined steel pipe with a size of 474 × 26 mm, and then into pipes of 474 × 24, 474 × 22 and 474 × 20 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, allowed to identify in them the 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 pipe rolling plant with pilgrim mills 8-16ʺ when rolling redacting tubes 490 × 40 × 8500 mm in size from EShP hollow ingot billets with a size of 650 × in. 440 × 3200 mm of 08Kh18N10T-Sh steel with subsequent boring and turning them into billet pipes of 474 × 22 × 4250 mm in size and rolling them at the KhPT 450 mill into commodity pipes along the route: 474 × 22 × 4250 - 426 × 18 × 5400 - 377 × 14 × 7500 - 325 × 10 × 11700 mm with a drawing coefficient μ of 1.35, 1.45 and 1.61, respectively - the proposed technology. According to the existing technology, EAW ingots-blanks with a size of 500 × 100 × 1750 mm were sewn in a cross-helical mill into sleeves 520 × in. 315 × 2400 mm in size, which were rolled on TPU 8-16ʺ with pilgrim mills into 346 × 32 pig tubes × 8000 mm. Conversion pipes were cut into two pipes of equal length, bored and turned into commodity pipes measuring 325 × 10 × 4000 mm. Data on the technological parameters for the production of 325 × 10 mm commercial tubes from hollow billet-blanks of ESH steel of 08Kh18N10T-Sh grade steel with a size of 650 × in. 440 × 3200 mm (proposed technology) and from ingots-blanks of EShB of 500 × 100 × 1750 mm existing technology) are given in table 1.

Figure 00000001

The table shows that, according to the existing technology, three ingots-blanks of ESRs of 500 × 100 × 1750 mm in size with a total weight of 8100 kg were set into production. The ingot billets were heated in a methodical furnace to a temperature of 1250-1260 ° C, stitched in a cross-helical rolling mill on a mandrel with a diameter of 300 mm with a hood μ = 1.37 and a diameter rise of δ = 4.00% in sleeves 520 × ext. 315 × 2400 mm, which were rolled at 8-16 '' TPU with pilgrim mills into conversion pipes 346 × 32 × 8000 mm in size. Conversion pipes were straightened in a six-roll straightening machine and heat-treated. Since on the existing equipment of ChTPZ OJSC 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 325 × 10 × 4000 mm. In accordance with TU 14-3R-197-2001, six pipes 325 × 10 × 4000 mm in size with a total weight of 1863 kg were adopted. The expenditure coefficient of the metal in the pipes of this batch was 4.348. According to the proposed technology, three hollow EAW ingots-blanks with a size of 650 × ext. 440 × 3200 mm with a total weight of 13541 kg were set into production, which were heated in a methodical furnace to a temperature of 1250-1260 ° C and rolled at 8-16 '' TPU with pilgrim mills into pig tubes measuring 490 × 40 × 8500 mm in caliber 498 mm with an angle of transverse release at the polishing section α a.s. v = 25 °, cut into rolls with a barrel diameter of 1150 mm, with a drawing coefficient μ = 3.12, compression in diameter δ = 24.62% and with feeds of hollow ingots-blanks into the deformation zone m = 25-26 mm. The pipes are straightened on a six-roll straightening machine for 2-3 passes to the curvature of not more than 6.0 mm for the total length of the pipes. After heat treatment - austenization - conversion pipes are cut into two pipes of equal length, bored and turned into conversion pipes-workpieces with a size of 474 × 22 × 4250 mm. Machined billet pipes were rolled at the KhPT 450 mill into commodity pipes along the routes: 474 × 22 × 4250 - 426 × 18 × 5400 - 377 × 14 × 7500 - 325 × 10 × 11700 mm with drawing coefficients μ respectively 1.35, 1 , 45 and 1.61. Six pipes 325 × 10 × 11700 mm in size with a total weight of 5453 kg were adopted in accordance with TU 14-3P-197-2001. The expenditure coefficient of the metal in the pipes of this batch amounted to 2.4833. Thus, in the production of pipes of 325 × 10 mm in size according to the proposed technology (method), a decrease in the expenditure coefficient of expensive metal per ton of pipes by 1865 kg, a 2.9-fold increase in length and roughness of the outer and inner surfaces of the pipes are obtained.

Using the proposed method for the production of seamless pipes of 325 × 8-14 mm in size for nuclear power facilities made of 08Kh18N10T-Sh steel will significantly reduce the consumption of expensive metal, reduce the roughness of the outer and inner surfaces, and increase the productivity of TPU 8-16 '' due to exclusion from the technological the process of flashing ingot billets in a cross-helical rolling mill into sleeves, increase the length of the pipes, and therefore reduce the cost of the pipes.

Claims (2)

1. Method for the production of seamless pipes 325 × 8-14 mm in size from 08Kh18N10T-Sh steel for nuclear power facilities, including the casting of hollow ingots by electroslag remelting of size 670 × ext. 420 × 3200 ± 50, turning them into ingots-blanks of size 650 × ext. 440 × 3200 ± 50 mm, heating the ingot blanks in the methodical furnace to a temperature of 1250-1260 ° C, dispensing ingot blanks from the furnace to the ingot cart, blowing the ingot blanks with compressed air, feeding the ingot blanks from two ends to 2000-2500 g of lubricant in the form of a mixture of graphite with sodium chloride in a ratio of 50/50 wt. Second, feeding the hollow-ingot workpieces to the upstream side Pilger mill rolling them on a pilger conical Dornach 412/418 mm in diameter 498 mm caliber, embedded in rolls with a diameter of barrel 1150 mm, with an angle transverse to release polishing portion α n. vyp = 24-26 °, in conversion pipes with a size of 490 × 40 × 8350-8650 mm with a drawing coefficient μ n = 3.12 and compression in diameter Δ = 24.62%, with the supply of hollow ingots to the deformation zone m = 25-27 mm, a piece of technological waste - seed ends and pilgrim heads - a hot cutting saw, straightening in a sheath a straightening machine using rolling rolling temperature for 2-3 passes to a curvature of not more than 6.0 mm per length of the conversion pipe, austenization, pipe cutting into two pipes of equal length, machining - boring and turning into conversion blanks 474 × 26 × 4175-4325, 474 × 24 × 4175-4325, 474 × 22 × 4175-4325 and 474 × 20 × 4175-4325 mm, rolling of mechanically processed conversion billets at the KhPT 450 mill into commodity pipes along the routes: 474 × 20 × 4175-4325 - 426 × 16 × 5400-5650 - 377 × 12 × 7750-8100 - 325 × 8 × 13000-13700 and 325 × 9 × 11600-12100 mm with drawing coefficients μ respectively 1.38, 1.50 , one, 73 and 1.54; 474 × 22 × 4175-4325 - 426 × 18 × 5300-5500 - 377 × 14 × 7300-7600 - 325 × 10 × 11400-11900 and 325 × 11 × 10400-10800 mm with drawing coefficients μ respectively 1.35, 1 45, 1.61 and 1.47; 474 × 24 × 4175-4325 - 426 × 20 × 5200-5400 - 377 × 16 × 7000-7300 - 325 × 12 × 10400-10900 and 325 × 13 × 9600-10000 mm with draw factors respectively 1.33, 1, 41, 1.54 and 1.42; 474 × 26 × 4175-4325 - 426 × 22 × 5100-5350 - 377 × 18 × 6600-7000 - 325 × 14 × 9400-10000 mm with drawing coefficients μ respectively 1.31, 137 and 1.48.
2. The method according to p. 1, characterized in that the machining of the hot rolled hot-rolled pipes of 490 × 40 × 4175-4325 mm in size is performed first in the converted mechanically-processed pipes of 474 × 26 mm in size, and then into the pipes of 474 × 24, 474 × 22 and 474 × 20 mm.
RU2016110183A 2016-03-22 2016-03-22 METHOD FOR PRODUCING SEAMLESS PIPES OF 325×8-14 mm SIZE MADE OF STEEL OF "08X18Н10Т-Ш" GRADE RU2615394C1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4641513A (en) * 1983-08-01 1987-02-10 Vallourec Cold rolling process for tubes, by means of a Pilger rolling mill and the rolling mill for its execution
RU2175899C2 (en) * 1999-09-23 2001-11-20 Открытое акционерное общество "Челябинский трубопрокатный завод" Method for making tubes of hard-to-form kinds of steel
RU2322315C2 (en) * 2006-05-22 2008-04-20 ОАО "Челябинский трубопрокатный завод" Method for producing in tube rolling plants with pilger mills seamless hot-deformed elongated tubes for steam boilers, steam conduits and manifolds of plants with high and super-critical parameters of steam
RU2401169C2 (en) * 2008-04-18 2010-10-10 ОАО "Челябинский трубопрокатный завод" Method of producing high-quality pipes from antirust steel 08x18h10t-"+" for nuclear power engineering structures

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4641513A (en) * 1983-08-01 1987-02-10 Vallourec Cold rolling process for tubes, by means of a Pilger rolling mill and the rolling mill for its execution
RU2175899C2 (en) * 1999-09-23 2001-11-20 Открытое акционерное общество "Челябинский трубопрокатный завод" Method for making tubes of hard-to-form kinds of steel
RU2322315C2 (en) * 2006-05-22 2008-04-20 ОАО "Челябинский трубопрокатный завод" Method for producing in tube rolling plants with pilger mills seamless hot-deformed elongated tubes for steam boilers, steam conduits and manifolds of plants with high and super-critical parameters of steam
RU2401169C2 (en) * 2008-04-18 2010-10-10 ОАО "Челябинский трубопрокатный завод" Method of producing high-quality pipes from antirust steel 08x18h10t-"+" for nuclear power engineering structures

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