RU2535251C2 - PRODUCTION OF SEAMLESS HOT-STRAINED MACHINED 610×36,53×3200-3550 mm PIPES FROM "08Х18Н10Т-Ш" GRADE STEEL FOR NUCLEAR POWER PRODUCTION - Google Patents

PRODUCTION OF SEAMLESS HOT-STRAINED MACHINED 610×36,53×3200-3550 mm PIPES FROM "08Х18Н10Т-Ш" GRADE STEEL FOR NUCLEAR POWER PRODUCTION Download PDF

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RU2535251C2
RU2535251C2 RU2013111213/02A RU2013111213A RU2535251C2 RU 2535251 C2 RU2535251 C2 RU 2535251C2 RU 2013111213/02 A RU2013111213/02 A RU 2013111213/02A RU 2013111213 A RU2013111213 A RU 2013111213A RU 2535251 C2 RU2535251 C2 RU 2535251C2
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blanks
diameter
pipes
length
sleeves
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RU2013111213A (en
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Анатолий Васильевич Сафьянов
Александр Анатольевич Федоров
Валентин Иреклеевич Тазетдинов
Владимир Яковлевич Осадчий
Николай Григорьевич Дановский
Борис Семенович ЛИТВАК
Валерий Александрович Головинов
Борис Пантелеевич Картушов
Александр Анатольевич Сафьянов
Владимир Сергеевич Баричко
Николай Петрович Климов
Константин Эдуардович Бубнов
Александр Юрьевич Матюшин
Виктор Николаевич Еремин
Константин Александрович Усанов
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Открытое акционерное общество "Челябинский трубопрокатный завод"
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Abstract

FIELD: process engineering.
SUBSTANCE: invention relates to production of pipes for nuclear power engineering. ESR ingots are turned to blanks to bore through holes therein. Blank bottom and shrink ends are shaped to spherical outer surface. Blanks are heated to ductility temperature and pierced at screw rolling stand to sleeves-blanks. Rate of forming of the ends of sleeves-blanks at exit of rolls for the length of 0.25-0.50 of strain source length is decreased by 20-25%. Sleeves-blanks are heated from cold charge to ductility temperature and bored-rolled at screw rolling stand to rerolled sleeves-blanks. Straining rate Vex. at exit of rerolled sleeve rear ends from tolls equal to strain source length is decreased to magnitude defined by equation V e x . = μ c μ r V r . s t e a d . ,
Figure 00000005
where µc us drawing at conversion of blanks to sleeves-blanks, µr is drawing at rolling-off of sleeves-blanks to rerolled sleeves-blanks, Vr.stead is roll rpm at steady rolling-off process. Rerolled sleeves-blanks are heat treated, bored and turned to commercial pipes.
EFFECT: higher mechanical properties, precision and surface quality.
1 tbl

Description

The invention relates to pipe rolling production, and in particular to a method for the production of seamless hot-formed mechanically machined pipes of size 610 × 36.53 × 3200-3550 mm from steel grade 08Kh18N10T-Sh for nuclear power facilities, and can be used in the manufacture of conversion sleeve blanks on tube rolling an 8-16 ″ installation with pilgrim mills, which incorporates a cross-helical rolling mill, followed by mechanical processing - boring and turning them into long-length commodity pipes according to TU 14-3R-197-2001.

In the practice of pipe production, there is a known method of manufacturing large and medium diameter pipes in tube-rolling plants with pilgrim mills from steel grades 08X18H12T, 08X10H20T2, including heating a hollow centrifugal cast billet and rolling it on a pilgrim mill (TI 158-Tr. TB1-63-98. ″ Production of seamless hot-rolled pipes from steel grade 08X18H12T for chemical engineering according to TU 14-3-743-78 ″. TI 158-Tr. TB 1-6-94. ″ Production of pipes from steel grade 08X10H20T2 and 08X10H16T2 for sliding systems according to TU 14 -3-1564-88 ″).

The disadvantage of this method is the use of a low-quality hollow centrifugal cast billet due to the lack of firmware technology in cross-helical rolling mills of billets with a diameter of more than 580 mm with a high content of Cr and Ni, and also due to the low power of the piercing mill drive.

When piercing blanks with a diameter of more than 500 mm from corrosion-resistant hardly deformable grades of steel and alloys, due to increased deformations under the influence of tensile stresses, cracks and tears arise on the sleeves, which leads to marriage and does not allow further redistribution, as well as due to increased loads firmware, leading to a stop of the engine of the piercing mill and the termination of the process.

In pipe-rolling production, there is a known method of rolling conversion tubes at plants with pilgrim mills of corrosion-resistant hard-to-deform steel grades and alloys of type 20X25H25TY-Sh of size 325 × 40 mm for the manufacture of water-cooled furnace rollers of size 295 × 22 × 2750 mm and heat-resistant pipes of 325 × 12 mm GOST from steel grade 06KHN28MDT (EI-943), including drilling and boring of ingots of size 460 × 1600 mm for a diameter of 275 and 325 + 5 / -0 mm, heating them to a plasticity temperature, rolling on a pilgrim mill in pipes of 325 × 40 and 325 × 25 mm followed by by turning and boring it into pipes with specified geometric dimensions (protocol No. 1031 for agreeing on the conditions for the delivery of pipes made of steel grades 06ХН28МДТ and 20Х25Н25ТЮ-Ш dated 12/14/2000 and a letter indicating pilot pilot rolling of conversion tubes in sizes 325 × 40 and 335 × 25 mm).

The disadvantage of this method is the use of bored ingot sleeves with an inner diameter greater than the diameter of the mandrel by 25-35 mm, because with a smaller gap on the inner surface of the pipe defects are formed in the form of flaws, tightening the mandrels, even with increased taper, and this in turn leads to increased consumption of expensive metal.

In the pipe industry, there is a known method for the production of hot-rolled commodity and conversion pipes of large and medium diameters (273-465 mm with a D / S ratio of 8-12.5) from corrosion-resistant hard-deformed steel grades and alloys on TPU with pilgrim mills (RF patent No. 2247612 dated 05.06.2003), including drilling of ESR ingots or billets with a diameter of 380-500 mm, holding on grate at a temperature of 500-550 ° C for 70-95 minutes depending on the diameter, heating to a ductility temperature of 1120-1140 ° C at a speed of 1.4-1.5 deg./min, firmware blanks in gil size in diameter by diameter at a roll speed of 25-40 rpm on a mandrel with a diameter that ensures reduction at a pilgrim mill of at least 25 mm, the first piercing of ESR ingots (blanks) with a diameter of 460-600 mm in a cross-helical rolling mill is carried out with by an extract of 1.2-1.4 at a speed of rotation of the work rolls of 15-25 revolutions per minute, and the second and subsequent (if necessary) firmware (rolling) with a rise or landing in diameter of not more than 5.0% and an exhaust of 1.5- 1.75 at a roll speed of 25-50 rpm, cold sleeves after lane Oh firmware with a diameter of 460-600 mm with a ratio of D / S = 3.0-4.5 is kept on grates at a temperature of 400-500 ° C for 50-70 minutes depending on the diameter and wall thickness, then heated to a plasticity temperature of 1100 -1260 ° C at a speed of 1.6-1.8 degrees per minute, depending on the grade of steel, and the sleeves after a piercing mill with a temperature of 600-800 ° C are uniformly heated to a ductility temperature of 1100-1260 ° C at a speed of 1.7- 2.0 degrees per minute, before being dispensed from the furnace, the cartridges are kept for 45-60 minutes at a temperature of plasticity with a tilting in 10-15 minutes at goal 180 °, the firmware process, from grabbing the ESR ingots (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 firmware process is carried out at 15-20 revolutions per minute, and at the exit of the sleeve from the rolls the number of revolutions is increased to 35-40, the firmware process - rolling, from gripping the sleeve to the full position on the mandrel, are conducted with a decrease in the number of revolutions of the work rolls from 50 to 20, the steady rolling process at 20-25 revolutions per minute, and at the exit of the sleeve rolls the speed is increased to 45-50, prok Pipe attack on a pilgrim mill is carried out with a hood µ = 3.0-5.0.

The disadvantage of this method is the inability to produce commodity and conversion hot-rolled pipes with a diameter of more than 465 mm with a D / S ratio of more than 12.5 on TPU 8-16 ″ with pilgrim mills and the inability to task blanks and sleeves in a cross-helical rolling mill of more than 2100 mm and issuing from a mill of conversion shell sleeves over 3700 mm. The increase in the number of revolutions of the work rolls at the exit of the sleeve blanks and the conversion sleeve blanks, when flashing and rolling, leads to an increase in the deformation rate, which leads to an increase in the grain size, which according to TU 14-3P-197-2001 should not exceed the third point, and the piercing of workpieces with a diameter of more than 500 mm from difficultly deformed steel and alloy grades leads to the formation of sagging due to the difference in the flow rates of the metal of the outer and inner layers of the shell blanks.

The closest technical solutions are the method of cross-helical rolling (ed. Certificate of the USSR No. 371993 / Discovery. Inventions. Commodity samples. Trademarks. 1974. No. 31 and A. V. Safyanov, I. N. Potapov, B. P. Kartushov et al. / Improving the firmware of a tube stock in unsteady modes // Steel. 1976. No. 12, p. 1115-1117).

The disadvantage of these solutions is that the first suggests that a workpiece is set in the rolls of cross-helical rolling, the ends of which have a spherical convex surface without specifying its geometric dimensions, and in the second there is a formula for determining the radius of curvature of the spherical convex surface of the workpieces based on only from the deformation zone, i.e. without taking into account the geometric dimensions and the steel grade of the stitched blanks and the distinction between the geometric dimensions of the profiling of the front and rear ends is not given, which is very important when flashing blanks from hard-deformed grades of steel and alloys, especially when flashing blanks with a diameter of more than 500 mm.

The objective of the proposed method for the production of seamless hot-formed mechanically machined pipes of size 610 × 36.53 × 3200-3550 mm from steel grade 08Kh18N10T-Sh for nuclear power facilities is to produce redone blanks-blanks of increased length, due to the reduction of the end trim due to lengths, and with the same mechanical properties along the length of the sizing blanks and, consequently, commodity pipes measuring 610 × 36.53 × 3200-3550 mm from 08Kh18N10T steel for nuclear power facilities with increased geometric dimensions and quality surfaces marked ″ for nuclear power ″ and acceptance by the inspection of the RF Gosatomnadzor Pipes of this size are made of 08Kh18N10T-Sh steel by hot rolling and especially on TPU with pilgrim mills are not produced anywhere in the world.

The technical result is achieved by the fact that in the known method for the production of seamless hot-formed mechanically machined pipes of size 610 × 36.53 × 3200-3550 mm from steel grade 08X18H10T-Sh for nuclear power facilities, including casting ESR ingots 630 ± 10 × 1750 ± 50 mm in size turning them into preforms and drilling a through hole to obtain a preform of size 610 ± 10 × 100 ± 5 × 1750 ± 50 mm, profiling its bottom and shrink ends, the outer surfaces of which have a spherical convex shape, while the bottom end is forward along shivki, shrink end - downstream EEPROM, the values of the geometric dimensions define the outer surfaces of the expressions:

L prof.p.k. = (0.62-0.69) l c.p. ,

where L prof.p.k = 190 ± 10 - the length of the profiled bottom end of the workpiece, mm; l c.p. = 290 - the length of the cone of the firmware of the working rolls of the TPA piercing mill 8-16 ″ with the pilgrim mills of ChTPZ OJSC, mm;

L prof. = (0.43-0.47) l c.p. ,

where L prof.p.k. = 130 ± 5.0 - the length of the profiled rear shrink end of the workpiece, mm;

D p.t. = D s -D vp + D v.n.k.p. ,

where D p.t. = 555 ± 5.0 - diameter of the bottom end of the profiled billet, mm; D s = 610 ± 10 - the outer diameter of the workpiece, mm; D vp = 740 - diameter of the work roll in pinch, mm; D v.n.k.p. = 685 - diameter of the work roll at the beginning of the firmware cone, mm;

D z.t. = D s -D vp + D V.S. ,

where D z.t. = 570 ± 5.0 - the diameter of the shrink end of the profiled billet, mm; D V.S. = 726 - diameter of the work roll in the section of the tip of the mandrel, mm;

R p.p.c = (0.98-1.0) R s ,

where R p.p. = 600 ± 5.0 is the radius of the spherical convex surface of the bottom end of the workpiece, the greater value of which relates to workpieces of a larger diameter, and smaller to workpieces of a smaller diameter, mm;

R s is the radius of the workpiece, mm;

R s.p.c = (0.81-0.83) R s ,

where R c.s.c. = 500 ± 5.0 is the radius of the spherical convex surface of the shrinkable end of the workpiece, the greater value of which relates to workpieces of a larger diameter, and the smaller to workpieces of a smaller diameter, mm, the workpieces are heated to ductility temperature, stitched in a cross-helical mill on a mandrel with a diameter of 325 mm with a diameter increase from 0 to 3.3% in blanks 620 × 340вн. × 2170-2460 mm in size, while the strain rate at the output of the rear ends of the blanks from the rolls by a length equal to 0.25-0, 50 lengths of the deformation zone, reduce by 20-25%, heat t of billet sleeves from a cold embankment to a temperature of plasticity and carry out flashing - rolling in a cross-helical rolling mill on a mandrel with a diameter of 485 mm with a rise of 4.8-5.0% in diameter into redactivated billet sleeves with a size of 650 × 500vn × 3310 -3700 mm, while the strain rate V o. at the output of the rear ends of the conversion sleeve blanks from the rolls, a length equal to the length of the deformation zone is reduced to a value that is determined from the expression:

Figure 00000001
,

where µ p - hood when flashing blanks into blanks; µ P - hood when rolling sleeve blanks into conversion sleeve blanks; V r. - the rotation speed of the rolls during the steady rolling process, rpm, then heat treatment of the sleeve blanks, boring and turning with a surface finish R z of not more than 20 μm into commodity pipes, a segment of rings for mechanical testing, trimming the ends, chamfering, ultrasonic testing and acceptance for compliance with technical specifications.

Redistribution of deformation parameters due to double flashing of ESHB ingots of 08Kh18N10T-Sh steel in combination with geometrical profiling parameters and technological parameters of flashing (flashing and rolling with a rise in diameter with a different deformation rate) made it possible to reduce the load on the drive of the piercing mill and obtain redacted blanks for machining - turning and boring to obtain the necessary geometric dimensions of commodity pipes measuring 610 × 36.53 × 3200-3550 mm, and the deformation rate Iles-preforms and metal recycling liner blanks steel making it possible to receive the sleeve-blank metal with the required mechanical properties that meet the requirements TU 14-3R-197-2001. Using the proposed geometric dimensions of the ESR ingots for the first firmware, the geometric dimensions of the profiled ends and the technological parameters of the firmware of the ingots and rolling the blanks into conversion blanks made it possible for the first time in the world to use TPU 8-16 ″ with pilgrim mills to obtain high-quality converted blanks-blanks necessary size for further processing into commercial pipes measuring 610 × 36.53 × 3200-3550 mm.

Comparative analysis with prototypes showed that the inventive method is characterized in that the bottom end is the front along the firmware, the shrink end is the rear along the firmware, the geometric dimensions of their outer surfaces are determined from the expressions:

L prof.p.k. = (0.62-0.69) l c.p. ,

where L prof.p.k. = 190 ± 10 - the length of the profiled bottom end of the workpiece, mm; l c.p. = 290 - the length of the cone of the firmware of the working rolls of the TPA piercing mill 8-16 ″ with the pilgrim mills of OAO ″ ChTPZ ″, mm;

L prof. = (0.43-0.47) l c.p. ,

where L prof.z.k = 130 ± 5.0 - the length of the profiled rear shrink end of the workpiece, mm;

D p.t. = D s -D vp + D v.n.k.p. ,

where D p.t. = 555 ± 5.0 - diameter of the bottom end of the profiled billet, mm; D s = 610 ± 10 - the outer diameter of the workpiece, mm; D vp = 740 - diameter of the work roll in pinch, mm; D v.n.k.p. = 685 - diameter of the work roll at the beginning of the firmware cone, mm;

D z.t. = D s -D vp + D V.S. ,

where D z.t. = 570 ± 5.0 - the diameter of the shrink end of the profiled billet, mm; D V.S. = 726 - diameter of the work roll in the section of the tip of the mandrel, mm;

R p.p.c = (0.98-1.0) R s ,

where R p.p. = 600 ± 5.0 is the radius of the spherical convex surface of the bottom end of the workpiece, the greater value of which relates to workpieces of a larger diameter, and smaller to workpieces of a smaller diameter, mm;

R s is the radius of the workpiece, mm;

R s.p.c = (0.81-0.83) R s ,

where R c.s.c. = 500 ± 5.0 is the radius of the spherical convex surface of the shrinkable end of the workpiece, the greater value of which relates to workpieces of a larger diameter, and the smaller to workpieces of a smaller diameter, mm, the workpieces are heated to ductility temperature, stitched in a cross-helical mill on a mandrel with a diameter of 325 mm with a diameter increase from 0 to 3.3% in blanks 620 × 340вн. × 2170-2460 mm in size, while the strain rate at the output of the rear ends of the blanks from the rolls by a length equal to 0.25-0, 50 lengths of the deformation zone, reduce by 20-25%, heat t of billet sleeves from a cold embankment to a temperature of plasticity and carry out flashing - rolling in a cross-helical rolling mill on a mandrel with a diameter of 485 mm with a rise of 4.8-5.0% in diameter into redactivated billet sleeves with a size of 650 × 500vn × 3310 -3700 mm, while the strain rate V o. at the output of the rear ends of the conversion sleeve blanks from the rolls, a length equal to the length of the deformation zone is reduced to a value that is determined from the expression:

Figure 00000002
,

where µ p - hood when flashing blanks into blanks; µ P - hood for rolling blanks into conversion blanks; V r. - the rotation speed of the rolls during the steady rolling process, rpm, then heat treatment of the sleeve blanks, boring and turning with a surface finish R z of not more than 20 μm into commodity pipes, a segment of rings for mechanical testing, trimming the ends, chamfering, ultrasonic testing and acceptance for compliance with technical specifications. Thus, the claimed method meets the criterion of ″ inventive step ″.

Comparison of the proposed solution (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 solution from the prototype, which allows us to conclude that the patentability condition is ″ inventive step ″.

The method was tested on a pipe-rolling installation with pilgrim mills 8-16 ″ OAO ″ ChTPZ ″ when rolling redactivated blanks with a size of 650 × 500vn. × 3400-3700 mm from 08Kh18N10T-Sh steel for machining to produce pipes of 610 × 36.53 × 3200-3550 mm according to TU 14-3R-197-2001 for nuclear facilities.

Data on the production of a pilot batch of hot-deformed machined pipes measuring 610 × 36.53 × 3200-3550 mm in accordance with TU 14-3R-197-2001 from steel grade 08Kh18N10T-Sh for nuclear power facilities according to the proposed technology are given in Table 1. B the table lacks comparative data, as pipes of this size, not only on TPU 8-16 ″, but also in the world, were not produced and are not manufactured by this method. The table shows that 5 ESR ingots-blanks were set into production: two 600 × 100 × 1750 mm in size, one 620 × 100 × 1800 in size, one 620 × 100 × 1700 in size and one 610 × 100 × 1750 mm in ingot. The bottom and shrink ends of the ESR ingots-blanks were profiled in accordance with the claims, namely, the lengths of the profiled bottom ends were 180, 180, 200, 200 and 190 mm, respectively, and the shrink 125, 125, 135, 135 and 130 mm . The diameters of the bottom ends of the profiled ingots-blanks were, respectively, 550, 550, 560, 560 and 555 mm, and shrinkage 565, 565, 575, 575 and 570 mm. The radii of the spherical convex surfaces of the bottom ends of the ingot blanks were, respectively, 595, 595, 605, 605 and 600 mm, and shrinkage 495, 495, 505, 505 and 500 mm. Data on the geometric dimensions of the profiled ends are shown in the table. ESR ingots were heated in a methodical furnace to the ductility temperature of steel 08Kh18N10T, namely, to a temperature of 1265-1270 ° C, and were stitched on a mandrel with a diameter of 325 mm in a cross-helical rolling mill into billet sleeves measuring 620 × 340 in. × 2230-2450 mm with a rise in diameter from 0 to 3.3%. To obtain uniform grain along the length of the blanks, the deformation rate of the rear ends at a length of 0.25-0.50 of the length of the deformation zone (780 mm) was reduced by 20%, i.e. from 30 to 24 revolutions of work rolls per minute. The billet sleeves from a cold embankment were heated in a methodical furnace to a temperature of 1250-1260 ° C and stitched - rolled in a cross-helical rolling mill on a mandrel with a diameter of 485 mm into redacter blanks with a size of 650 × 500 in. × 3400-3700 mm with a rise 4.8% in diameter. The deformation rate of the rear ends of the blanks was reduced by 14.3% from 35 to 30 rpm. Changing the speed regime for the deformation of the sleeve blanks and conversion sleeve blanks (flashing and rolling) made it possible to obtain grain along the length of the sleeves 4-5 points, and the heat treatment mode to obtain the mechanical properties of the pipe metal that fully meet the requirements of TU 14-3R-197-2001 . Due to the profiling of the ends of the ESR ingots, the end trim was significantly reduced, which made it possible to increase their length and, consequently, the length of commodity pipes measuring 610 × 36.53 mm by 200-250 mm. After heat treatment, the conversion blanks were transferred to the section for processing ingots, billets and pipes for special purposes, where they were turned and bored into commodity pipes measuring 610 ± 3.2 × 36.53 ± 2.75 × 3200-3550 mm. Temples were selected from the pipes from the end sections and transferred to the testing center for conducting control tests. Tests have shown that the metal of the pipes in all respects meets the requirements of TU 14-3R-197-2001. The pipes passed UZK in accordance with the requirements of TU 14-3R-197-2001. With ultrasonic testing, no defects were detected on the pipes. Then the pipes were paved, a two-sided chamfer was taken at an angle of 35-40 ° with a blunting in the center of the wall thickness of 8 ± 2.0 mm, presented to the representative of the GAN of the Russian Federation and accepted in accordance with the technical specifications and sent to the customer.

Using the proposed method allowed to master at TPU 8-16 ″ with pilgrim mills the production of high-quality hot-deformed conversion sleeve blanks with a size of 650 × 500w. × 3400-3700 mm from ingots-blanks of electroslag remelting steel grade 08X18H10T-Sh 610 ± 10 × 100 ± 5 , 0 × 1750 ± 50 mm, which after austenization were bored and turned to a size of 610 × 36.53 × 3200-3550 mm, delivered in full accordance with the requirements of TU 14-3R-197-2001 on mechanical properties, geometric dimensions and quality surface. Using the technical solutions given in the claims, it was possible to increase the length of the commodity pipes by 200-250 mm and get 4-5 points of grain along the length of the pipes. The expenditure coefficient of the metal for this batch of pipes ranged from 2.231 to 2.260, depending on the size of the ESR ingots, i.e. get a reduction of 70-80 kg per ton of pipe.

Data on the production of a pilot batch of hot-deformed machined pipes measuring 610 × 36.53 × 3200-3550 mm from 08Kh18N10T-Sh steel for nuclear power facilities using the proposed technology

Figure 00000003

Claims (1)

  1. A method for the production of seamless hot-deformed pipes measuring 610 × 36.53 × 3200-3550 mm from steel grade 08Kh18N10T-Sh for nuclear power facilities, including casting ESR ingots 630 ± 10 × 1750 ± 50 mm in size, turning them into billets and drilling a through hole, to obtain a workpiece with a size of 610 ± 10 × 100 ± 5.0 × 1750 ± 50 mm, profiling its bottom and shrink ends, the outer surfaces of which have a spherical convex shape, while the bottom end is the front along the firmware, the shrink end is the rear firmware, and the values of geometric dimensions the ditch of their outer surfaces is determined from the expressions:
    L prof.p.k. = (0.62-0.69) l c.p. ,
    where L prof.p.k = 190 ± 10 - the length of the profiled bottom end of the workpiece, mm;
    l c.p. = 290 - the length of the flashing cone of the working rolls of the TPA piercing mill 8-16 ′ ′ with pilgrim mills, mm;
    L prof. = (0.43-0.47) l c.p. ,
    where L prof.z.k = 130 ± 5.0 the length of the profiled shrink end of the workpiece, mm;
    D p.t. = D s -D cp + D cfp ,
    where D p.t. = 555 ± 5.0 - diameter of the bottom end of the profiled billet, mm;
    D s = 610 ± 10 - the outer diameter of the workpiece, mm;
    D vp = 740 - diameter of the work roll in pinch, mm;
    D v.n.k.p. = 685 - diameter of the work roll at the beginning of the firmware cone, mm;
    D z.t. = D s -D vp + D V.S. ,
    where D z.t. = 570 ± 5.0 - the diameter of the shrink end of the profiled billet, mm;
    D V.S. = 726 - diameter of the work roll in cross section with the tip of the mandrel, mm;
    R p.p.c. = (0.98-1.0) R s ,
    where R p.p. = 600 ± 5.0 is the radius of the spherical convex surface of the bottom end of the workpiece, the greater value of which relates to workpieces of a larger diameter, and smaller to workpieces of a smaller diameter, mm;
    R s is the radius of the workpiece, mm;
    R s.c.c. = (0.81-0.83) R s ,
    where R c.s.c. = 500 ± 5.0 is the radius of the spherical convex surface of the shrinkable end of the workpiece, the greater value of which relates to workpieces with a larger diameter, and a smaller one to workpieces of a smaller diameter, mm;
    the billets are heated to the temperature of plasticity and stitched in a screw rolling mill on a mandrel with a diameter of 325 mm with a rise in diameter from 0 to 3.3% into billet blanks measuring 620 × 340 in. × 2170-2460 mm, while the strain rate at the exit of the rear ends the sleeve blanks from the rolls to a length equal to 0.25-0.50 of the length of the deformation zone are reduced by 20-25%, the sleeve blanks are heated from a cold embankment to a plasticity temperature and flashing is carried out in a screw rolling mill on a mandrel with a diameter of 485 mm with a diameter increase of 4.8-5.0% in conversion guillines s-billet size of 650 × 500vn. × 3310-3700 mm, the deforming speed V O. at the output of the rear ends of the conversion sleeve blanks from the rolls, a length equal to the length of the deformation zone is reduced to a value that is determined from the expression:
    V at s x . = μ P μ R V R . at from t .
    Figure 00000004
    ,
    where µ p - hood when flashing blanks into blanks-blanks,
    µ P - hood during rolling of blanks into conversion sleeves blanks,
    V r. - the rotation speed of the rolls during the steady rolling process, rpm;
    then heat treatment of the sleeve blanks, boring and turning with a surface finish of Rz not more than 20 microns into product pipes, a segment of rings for mechanical testing, trimming, chamfering, ultrasonic inspection and acceptance of product pipes for compliance with technical specifications are performed.
RU2013111213/02A 2013-03-12 2013-03-12 PRODUCTION OF SEAMLESS HOT-STRAINED MACHINED 610×36,53×3200-3550 mm PIPES FROM "08Х18Н10Т-Ш" GRADE STEEL FOR NUCLEAR POWER PRODUCTION RU2535251C2 (en)

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RU2297891C2 (en) * 2005-05-11 2007-04-27 ОАО "Челябинский трубопрокатный завод" Method for producing in tube rolling plants with pilger mills seamless hot-deformed large- and mean-diameter tubes for steam boilers, steam pipes and collectors of plants with high and super-critical parameters of steam from ingots of electroslag refining and continuously cast billets
RU2386498C2 (en) * 2006-12-25 2010-04-20 ОАО "Челябинский трубопрокатный завод" METHOD FOR PRODUCTION OF SEAMLESS HOT-DEFORMED BOILER THICK-WALLED PIPES WITH SIZE OF 377×50 AND 465×75 mm IN PIPE-ROLLING PLANTS WITH PILGER MILLS FOR PIPELINES OF HEAT COAL BLOCKS WITH SUPERCRITICAL STEAM PARAMETRES
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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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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU371993A1 (en) * 1971-05-24 1974-08-25
US4798071A (en) * 1986-06-25 1989-01-17 Kocks Technik Gmbh & Co. Seamless tube production
RU2297891C2 (en) * 2005-05-11 2007-04-27 ОАО "Челябинский трубопрокатный завод" Method for producing in tube rolling plants with pilger mills seamless hot-deformed large- and mean-diameter tubes for steam boilers, steam pipes and collectors of plants with high and super-critical parameters of steam from ingots of electroslag refining and continuously cast billets
RU2386498C2 (en) * 2006-12-25 2010-04-20 ОАО "Челябинский трубопрокатный завод" METHOD FOR PRODUCTION OF SEAMLESS HOT-DEFORMED BOILER THICK-WALLED PIPES WITH SIZE OF 377×50 AND 465×75 mm IN PIPE-ROLLING PLANTS WITH PILGER MILLS FOR PIPELINES OF HEAT COAL BLOCKS WITH SUPERCRITICAL STEAM PARAMETRES
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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