RU2401169C2 - Method of producing high-quality pipes from antirust steel 08x18h10t-"+" for nuclear power engineering structures - Google Patents

Method of producing high-quality pipes from antirust steel 08x18h10t-"+" for nuclear power engineering structures Download PDF

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RU2401169C2
RU2401169C2 RU2008115393/02A RU2008115393A RU2401169C2 RU 2401169 C2 RU2401169 C2 RU 2401169C2 RU 2008115393/02 A RU2008115393/02 A RU 2008115393/02A RU 2008115393 A RU2008115393 A RU 2008115393A RU 2401169 C2 RU2401169 C2 RU 2401169C2
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pipes
metal layer
rolled
boring
conversion
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RU2008115393/02A
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RU2008115393A (en
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Анатолий Васильевич Сафьянов (RU)
Анатолий Васильевич Сафьянов
Александр Анатольевич Федоров (RU)
Александр Анатольевич Федоров
Сергей Геннадьевич Чикалов (RU)
Сергей Геннадьевич Чикалов
Дмитрий Всеволодович Марков (RU)
Дмитрий Всеволодович Марков
Леонид Игнатьевич Лапин (RU)
Леонид Игнатьевич Лапин
Валерий Александрович Головинов (RU)
Валерий Александрович Головинов
Николай Григорьевич Дановский (RU)
Николай Григорьевич Дановский
Борис Семенович Литвак (RU)
Борис Семенович ЛИТВАК
Владимир Сергеевич Баричко (RU)
Владимир Сергеевич Баричко
Сергей Васильевич Ненахов (RU)
Сергей Васильевич Ненахов
Валерий Андреевич Логовиков (RU)
Валерий Андреевич Логовиков
Юрий Борисович Белокозович (RU)
Юрий Борисович Белокозович
Николай Петрович Климов (RU)
Николай Петрович Климов
Константин Николаевич Бубнов (RU)
Константин Николаевич Бубнов
Константин Александрович Усанов (RU)
Константин Александрович Усанов
Александр Юрьевич Матюшин (RU)
Александр Юрьевич Матюшин
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ОАО "Челябинский трубопрокатный завод"
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Abstract

FIELD: metallurgy.
SUBSTANCE: invention relates to production of 260-450×40-70 mm-hot-rolled conversion pipes for subsequent tooling into high-quality pipes sized to 245×19, 351×36, 415×50, 426×40, 426×50 and 436×45 mm from antirust steel or for rolling at step-rolled mill of conversion 250-440×30-60 mm-pipes with subsequent tooling for re-rolling at mills "ХПТ" into pipes of aforesaid sizes. Proposed method comprises producing flat ingots by electroslag remelting, producing 100±5.0 mm-diametre central bores in said ingots, heating them to plasticity temperature, piercing ingots at skew rolling mill into barrels, rolling of conversion pipes at step-rolled mill, cutting off step-rolled billets and seed ends by hot-cutting saw, pipe straightening, austenitisation, turning and boring to preset size with inner and outer surface roughness not exceeding Ra 10.0 mcm. Note here that conversion pipe rolling at step-rolled mill is performed for rerolling at "ХПТ" mills. Conversion hot-rolled pipes are bored and turned at servo-drive machine tools into conversion pipes with metal removal defined by expressions ΔS"В.П."=KΔS"В.С.", ΔS"Н.П."=K1ΔS"Н.С.", where ΔS"В.П." is metal removal amount in boring for rerolling, mm; ΔS"В.С." is removed metal layer thickness in boring for finished size, mm; K=(0.5 - 0.6) is coefficient of metal layer thickness reduction with its larger magnitudes relate to large diametre pipes; ΔS"Н.П." is metal layer thickness in boring for temporary rerolling, mm; ΔS"Н.С." is removed metal layer thickness in boring for finished size, mm; K1=(0.4 - 0.5) is coefficient of metal layer thickness reduction with its larger magnitudes relate to large diametre pipes.
EFFECT: higher quality, reduced costs.
4 cl, 1 tbl

Description

The invention relates to pipe rolling production, and in particular to a method for the production of hot-rolled steel tubes with a size of 260-450 × 40-70 mm for subsequent machining (boring and turning) into pipes of 245 × 19, 351 × 36, 415 × 50, 426 × 40 , 426 × 50 and 436 × 45 mm from 08Kh18N10T-Sh corrosion-resistant steel for nuclear power facilities or rolling at the pilgrim mill of conversion pipes 250-440 × 30-60 mm in size with subsequent machining for technological rolling on the HPT mills into data pipes sizes.

In pipe rolling production, a method is known for the production of commodity and conversion pipes from hardly deformed steel grades, including drilling a central hole with a diameter of 100 ± 5.0 mm in blanks and ingots of EAWs with a diameter of 380-500 mm, holding them on the grates of method furnaces at a temperature of 500-550 ° C for 70-95 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 of ESR into the sleeves size in size by diameter at the speed of rotation of the workers rolls 25-40 rpm on the mandrel Diameter providing pilger reduction is at least 25 mm (RF patent №2175899, Bul. №32, 20.11.2001).

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 workpiece with a diameter of 540-620 mm is required, which is impossible to flash due to the low power of the drive of the oblique rolling mill, and most importantly, this method does not stipulate the allowance for machining of conversion pipes for the manufacture of commodity pipes of size 245 × 19, 351 × 36, 415 × 50, 426 × 40, 426 × 50 and 436 × 45 mm from 08Kh18N10T-Sh corrosion-resistant steel for nuclear power facilities.

In pipe rolling production, a method for the production of commodity and conversion hot-deformed pipes of large and medium diameters from corrosion-resistant hard-to-deform steel grades and alloys in pipe rolling plants (TPU) with pilgrim mills, including drilling a central hole with a diameter of 100 ± 5.0 mm in ESR ingots and billets, is known , heating them to a temperature of plasticity, the first flashing of ESR ingots or blanks with a diameter of 460-600 mm in a piercing mill with an extract of 1.2-1.4 at a speed of rotation of the work rolls of 15-25 rpm, and watts yelling and subsequent, if necessary, firmware-rolling with a rise or landing on the diameter of not more than 5.0% and a hood 1.4-1.75 at a speed of rotation of the rolls of 20-50 rpm, using cold or hot landing liners in the furnace, the process of flashing from capturing ESR ingots 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 established flashing process at 15-20 rpm, and at the exit of the sleeve from the rolls the speed is increased to 35-40 rev / min, the process of flashing-rolling (second firmware) from the capture sleeve full residence 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 number of revolutions is increased to 45-50, and the pipes are rolled on a pilgrim mill extractor hood µ = 3.0-5.0 (RF patent No. 22427612, bull. No. 7, 03/10/2005).

The disadvantage of this method is that it also does not stipulate an allowance for machining of conversion pipes for the manufacture of high-quality commodity pipes with a size of 245 × 19, 351 × 36, 415 × 50, 426 × 40, 426 × 50 and 436 × 45 mm from corrosion -resistant steel 08X18H10T-Sh for nuclear facilities.

The closest technical solution is a method for the production of seamless hot-deformed pipes 245 × 19, 351 × 36, 415 × 50, 426 × 40, 426 × 50 and 436 × 45 mm in diameter from ESR ingots of 08Kh18N10T-Sh corrosion-resistant steel for nuclear power facilities with bored inner and turned outer surfaces with a roughness of not more than R a 10 microns in accordance with GOST 2789 (TU 14-158-131-2002 "Seamless hot-deformed pipes of high-quality corrosion-resistant steel").

The disadvantage of this method is that in the production of pipes of these sizes with a length of at least 4000 mm, the allowance for machining (boring and turning) must be at least 10 mm per side. Thus, during machining (turning and boring) 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 of the pipes).

The objective of the proposed method is to reduce the allowance for machining (boring and turning) of hot-deformed tubes, to reduce the expenditure coefficient of the metal during redistribution of the ingot ESR-commodity pipe from corrosion-resistant steel 08X18H10T-Sh according to TU 14-158-131-2002, increase the length of commodity pipes, and consequently, a decrease in their cost.

The technical result is achieved by the fact that in the known method for the production of pipes from corrosion-resistant steel grade 08X18H10T-Sh for nuclear power facilities, including ingots casting by electroslag remelting, drilling in ingots of a central hole with a diameter of 100 ± 5.0 mm, heating the ingots to a plasticity temperature, flashing the ingots in the oblique rolling mill into the sleeves, rolling the sleeves into hot-rolled steel tubes on a pilgrim mill, cutting off technological waste — pilgrim heads and seed ends with a hot cutting saw, Rawka pipes, heat treatment - austenitization, machining - turning and boring to the finished size with a surface roughness outside and inside planes not more than R a 10,0 um, conversion mechanically treated hot tube - and grind bore, machined with the tracking system, in steel making billet pipes with metal removal, the value of which is determined from the expressions ΔSв.п = КΔSв.с, ΔSн.п = K 1 ΔSн.с, where - ΔSв.п - the size of the metal layer to be removed when boring under a technological roll, mm; ΔSv.s - the size of the removed metal layer when boring to the finished size, mm; K = (0.5-0.6) is the coefficient of reduction in the size of the removed metal layer during boring, large values of which relate to pipes of large diameters; ΔSn.p - the value of the removed metal layer during turning under the technological roll, mm; ΔSn.s - 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, undetected defects on the billet pipes are removed by abrasive grinding or grinding, the billet pipes are rolled on cold rolling mills into commodity pipes with a roughness of the outer and inner planes of not more than Ra 2.5 μm, conversion billets are rolled on cold rolling mills into commodity pipes with wall compression of 10.0 to 20% and reduction in diameter from 8.0 to 15.0%, the higher values refer to pipes of smaller diameter.

A comparative analysis of the proposed solution with the prototype shows that the claimed method differs from the known one in that the hot rolled pipes are machined - bored and machined, on machines with a follow-up system, into converted steel billets with metal removal, the value of which is determined from the expressions ΔSв.п = КΔSв.с, ΔSн.п = K 1 ΔSн.с, where ΔSв.п - the size of the metal layer to be removed during boring under technological roll, mm; ΔSv.s - the size of the removed metal layer when boring to the finished size, mm; K = (0.5-0.6) is the coefficient of reduction in the size of the removed metal layer during boring, large values of which relate to pipes of large diameters; ΔSn.p - the value of the removed metal layer during turning under the technological roll, mm; ΔSn.s - 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, undetected defects on the billet pipes are removed by abrasive grinding or grinding, the billet pipes are rolled on cold rolling mills into commodity pipes with a roughness of the outer and inner planes of not more than Ra 2.5 μm, conversion billets are rolled on cold rolling mills into commodity pipes with wall compression of 10.0 to 20% and reduction in diameter from 8.0 to 15.0%, the higher values refer to pipes of smaller diameter. 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 signs that distinguish the claimed method from the prototype, which corresponds to the patentability of "inventive step".

The method was tested on a pipe-rolling installation with 8-16 ′ ′ pilgrim mills of ChTPZ OJSC when rolling pig tubes of 370 × 56 × 4900 and 445 × 60 × 5300 mm in length from 540 × 100 × 1750 and 585 × 100 × 1750 mm ESR ingots steel grade 08Kh18N10T-Sh according to the existing technology and conversion pipes with sizes of 420 × 52 × 5400 and 480 × 55 × 5200 mm from ESR ingots of 540 × 100 × 1750 and 585 × 100 × 1750 mm in size according to the proposed technology, followed by their boring and by turning in workshop No. 5 for sizes 410 × 42 × 5400 and 470 × 45 × 5200 mm and rolling them at the KhPT 450 mill into commodity pipes measuring 351 × 36 and 426 × 40 mm. The data on rolling pipes of 351 × 36 and 426 × 49 mm in size from corrosion-resistant steel grade 08X18H10T-Sh according to TU 14-158-131-2002 for nuclear power facilities according to the existing and proposed technologies are given in the table. The table shows that 5 ESR ingots for each pipe size were set for production according to the existing and proposed technologies. According to the existing technology, in the production of commodity pipes measuring 351 × 36 mm from 5 ingots with a total weight of 15.184 tons, 5 pipes 370x56x5800 mm in size were produced at the pilgrim mill, which were bored and turned into commodity pipes according to TU 14-158-131-2002. The average pipe length at delivery was 5800 mm. 29.0 m of pipes with a total weight of 8.161 tons were commissioned. The expenditure coefficient of the metal from the ESR ingot to the finished pipe was 1.861. According to the proposed technology, at 8-16 ″ TPU, ESR ingots were rolled into 420x52x5400 mm sized pipes, which were bored and turned on a machine with a tracking system into 410 × 42 × 5400 mm sized pipes with metal removal to the side in accordance with paragraph .1 claims. Places where defects in the rolling industry were not removed (blackness and fine captivity) were removed by abrasive stripping (claim 2). The pipes were preliminarily accepted by the Quality Control Department and rolled on the KhPT 450 mill into commodity pipes measuring 351 × 36 mm in accordance with claim 4. The average pipe length was 6700 mm. In accordance with TU 14-158-131-2001, 33.5 m of pipes with a total mass of 9.428 tons were received. The expenditure coefficient of metal for pipes of this batch was 1.611. Thus, in the production of pipes with a size of 351 × 36 mm according to the proposed technology (method), a decrease in the cost coefficient of expensive metal per ton of pipes by 250 kg, an increase in pipe length by 15.5%, and the roughness of the outer and inner surfaces is reduced by more than 4.0 times. A similar picture was obtained when rolling pipes with a size of 426 × 40 mm. According to the existing technology, 5 ESR ingots with a size of 585 × 100 × 1750 mm with a total weight of 17.914 tons were rolled at 8-16 ″ TPU with pilgrim mills into 445 × 60 × 5300 mm conversion pipes that were bored and turned into commodity pipes of 426 size × 40 × 5300 mm. Accepted in accordance with TU14-158-131-2002 - 26.5 m of pipes with a total weight of 10.154 tons. The expenditure coefficient of the metal was 1.754. According to the proposed technology, 5 ESR ingots of 08Kh18N10T-Sh steel were rolled into conversion pipes of size 480 × 55 × 5200 mm, and then bored and turned on a machine with a follow-up system into conversion pipes of size 470 × 45 × 5200 mm in accordance with paragraph 1 formulas of the invention, and then rolled on the mill HPT 450 into commodity pipes measuring 426 × 40 × 5900 mm. 29.5 m of pipes with a total weight of 11.304 tons were adopted in accordance with the technical specifications. The expenditure coefficient of the metal for the pipes of this batch was 1.584. Thus, in the production of pipes with a size of 426 × 40 mm according to the proposed technology (method), a reduction in the cost coefficient of expensive metal per ton of pipes by 170 kg was obtained, the pipe length was increased by 11.3%, and the roughness of the outer and inner surfaces was reduced by 4, 0 times.

Using the proposed method for the production of pipes from corrosion-resistant steel grade 08X18H10T-Sh for nuclear power facilities will significantly reduce the consumption of expensive metal, reduce the roughness of the outer and inner surfaces and significantly increase the length of the pipes, and therefore reduce the cost of pipes and reduce the number of welding joints at the facilities nuclear power industry (NPP).

Data on the production of high-quality pipes of size 351 × 36 and 426 × 40 mm from corrosion-resistant steel grade 08X18H10T-Sh according to TU 14-158-131-2002 for nuclear facilities according to the existing and proposed technologies Pipe size Type of technology ESR Ingot Size Assigned to the production of ESR ingots Size is red. pipes The size of the pipes after the machinist. Pipe size after CPT Pipes commissioned in accordance with TU 14-158-131-2002 Surface cleanliness R a Consumption ratio. metal (mm) - (mm) (pieces) (tons) (mm) (mm) (mm) (m / t) μm - 351 × 36 Creatures. 540 × 100 × 1750 5 15,184 370 × 56 × 5800 351 × 36 × 5800 -

Figure 00000001
≤10 1,861 Suggestion 540 × 100 × 1750 5 15,184 420 × 52 × 5400 410 × 42 × 5400 351 × 36 × 6700
Figure 00000002
≤2.5 1,611
426 × 40 Creatures. 585 × 100 × 1750 5 17,914 445 × 60 × 5300 426 × 40 × 5300 -
Figure 00000003
≤10 1,754
Suggestion 585 × 100 × 1750 5 17,914 480 × 55 × 5200 470 × 45 × 5200 426 × 40 × 5900
Figure 00000004
≤2.5 1,584

Claims (4)

1. Method for the production of high-quality pipes from corrosion-resistant steel grade 08X18H10T-Sh for nuclear power facilities, including ingots casting by electroslag remelting, drilling in ingots of a central hole with a diameter of 100 ± 5.0 mm, heating ingots to ductility temperature, piercing ingots in the mill oblique rolling into sleeves, rolling sleeves into hot-rolled pig tubes on a pilgrim mill, a piece of technological waste - pilgrim heads and seed ends with a hot cutting saw, straightening pipes, heat treatment y - austenization, machining - turning and boring to a finished size with a roughness of the outer and inner planes of not more than R a 10.0 μm, characterized in that the hot rolled pipes are machined - bored and turned, on machines with a tracking system, into pipes - billets with metal removal, the value of which is determined from the expressions:
ΔSv.p = KΔS.v.s,
ΔSn.s = K 1 ΔSn.s,
where ΔSv.p - the value of the removed metal layer during boring under technological roll, mm;
ΔSv.s - the size of the removed metal layer when boring to the finished size, mm;
K = (0.5-0.6) is the coefficient of reduction in the size of the removed metal layer during boring, large values of which relate to pipes of large diameters;
ΔSn.p - the value of the removed metal layer during turning under the technological roll, mm;
ΔSn.s - 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 removed metal layer during turning, large values of which relate to pipes of large diameters.
2. The method according to claim 2, characterized in that the defects that are not removed on the conversion tubes-blanks are removed by abrasive cleaning or grinding.
3. The method according to claim 2 or 3, characterized in that the conversion pipe billets are rolled on cold rolling mills into commodity pipes with a roughness of the outer and inner planes of not more than Ra 2.5 μm.
4. The method according to 4, characterized in that the conversion pipe billets are rolled on cold rolling mills into commodity pipes with compression on the wall from 10.0 to 20% and reduction in diameter from 8.0 to 15.0%, with large values relate to pipes of smaller diameter.
RU2008115393/02A 2008-04-18 2008-04-18 Method of producing high-quality pipes from antirust steel 08x18h10t-"+" for nuclear power engineering structures RU2401169C2 (en)

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RU2620203C1 (en) * 2016-03-22 2017-05-23 Комаров Андрей Ильич METHOD OF MANUFACTURING SEAMLESS PIPES OF SIZE 426 × 14-16 mm FOR NUCLEAR POWER FACILITIES OF STEEL OF "08Х18Н10-Ш" GRADE
RU2642998C1 (en) * 2017-03-20 2018-01-29 Комаров Андрей Ильич Method of production of seamless cold-formed pipes 08h18n10t-sh of size 426x14-19 mm

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