RU2615920C1 - METHOD FOR PRODUCING SEAMLESS COLD DRAWN PIPES OF 325x8-14 mm SIZE MADE OF STEEL OF "08Х18Н10Т-Ш" GRADE - Google Patents

METHOD FOR PRODUCING SEAMLESS COLD DRAWN PIPES OF 325x8-14 mm SIZE MADE OF STEEL OF "08Х18Н10Т-Ш" GRADE Download PDF

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RU2615920C1
RU2615920C1 RU2016110203A RU2016110203A RU2615920C1 RU 2615920 C1 RU2615920 C1 RU 2615920C1 RU 2016110203 A RU2016110203 A RU 2016110203A RU 2016110203 A RU2016110203 A RU 2016110203A RU 2615920 C1 RU2615920 C1 RU 2615920C1
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pipes
blanks
rolling
size
diameter
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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 ingots casting with electroslag remelting, turning them into ingot billets, the central hole drilling in ingot billets, heating, feeding of ingot billets grease to the central hole, ingots piercing in the mill of cross-screw rolling on the mandrel into the cupped blanks, heating of the cupped blanks from a cold charging to a temperature of 1250-1260°C, feeding lubricants into the cupped blanks, piercing-rolling in the mill of cross-screw rolling on the mandrel into the cupped blanks, rolling the cupped blanks on TPU 8-16" with pilger mills into the hot rolled tube stocks, cutting of technological waste - seed ends and pilger heads, straightening in a 6-hi leveler, austenitization, cutting of pipes on two pipes of equal length, mechanical processing-tubes boring and turning into the tube stock workpieces, rolling of them on CRT mill into trade pipes and thermal processing of cold-rolled pipes.
EFFECT: reduced expensive metal consumption, reduced roughness of outer and inner surfaces of pipes, improved productivity and increased lengths of pipes, reduced cost provided by regulation of processing modes and methods 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 of 325 × 8-14 mm in size from steel grade 08X18H10T-Sh for nuclear power facilities.

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 billet of ESR with a diameter of 540-620 mm is necessary, which, due to the low drive power of the cross-helical rolling mill, cannot be sewn, and most importantly, this method does not stipulate machining allowance.

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 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 of 15-25 rpm, and the second and subsequent, if necessary, rolling-firmware 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 shell linings - preparations into the furnace, the process of flashing from capturing ingots-blanks of ESR or blanks until they are completely on the mandrel are carried out with a decrease in the number of revolutions of the work rolls from 25 to 15, the established process of flashing at 15-20 rpm, and at the exit of the sleeve-blanks rolls, the speed is increased to 35-40 rpm, the firmware-rolling process (second firmware), from the capture of the billet sleeve to the full position 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. 22427612, bull. No. 7, 03/10/2005).

The disadvantage of this method is that it is aimed at the production of commodity mechanically processed pipes and also does not stipulate the allowance for machining of conversion pipes for the manufacture of commodity mechanically processed pipes from corrosion-resistant steel 08X18H10T-Sh for nuclear power facilities.

In the pipe industry, there is a known method for the production of seamless hot-formed mechanically machined pipes 245 × 19, 351 × 36, 415 × 50, 426 × 40, 426 × 50 and 436 × 45 mm long from ingot blanks of ESR of 08Kh18N10T-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 as well as the above analogues, 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).

The closest technical solution is a method for producing high-quality pipes from 08Kh18N10T-Sh corrosion-resistant grade for nuclear power facilities, including casting ingots by electroslag remelting, turning ingots into ingot blanks, drilling in ingots-blanks of a central hole with a diameter of 100 ± 5 mm, heating ingots billets to the temperature of ductility, piercing ingot-billets in a cross-helical rolling mill into sleeves, rolling sleeves at TPU with pilgrim mills into hot rolled pipes, from cutting of 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 expressions:

ΔS v.p. = KΔS century.c. , ΔS n.p. = K 1 ΔS n.s. ,

where ΔS v.p. - the value of the removed metal layer when boring under the technological roll, mm; ΔS c.c. - 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 N.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, 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, class 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 objective of the proposed method is the development of the production of seamless cold-rolled pipes of increased quality with a size of 325 × 8-14 mm of increased length from conversion pipe blanks of 474 × 20-26 × 3500-3600 mm in size, obtained by machining - boring and turning of hot-rolled pipes of 490 × 40 × 7000-7200 mm, rolled at 8-16 "TPU with pilgrim mills from EShP ingot billets of 620 × 115 × 1750 ± 25 mm in size, reduction in the expenditure coefficient of the metal during redistribution of EShP ingots - commodity pipe made of 08Kh18N10T-Sh stainless steel according to TU 14-3P-197-2001 for volume nuclear power projects, as well as increasing the productivity of TPU 8-16 "during rolling of conversion pipes.

The technical result is achieved through the use of a method for the production of seamless cold-rolled pipes of 325 × 8-14 mm in size from 08Kh18N10T-Sh steel for nuclear power facilities, including casting of electroslag remelting ingots, turning them into 620 × 1750 ± 25 mm ingots, drilling in ingots-blanks of the central hole with a diameter of 115 ± 5 mm, heating the ingots-blanks to a temperature of 1250-1260 ° C, feeding lubricants in the central drilling of ingots-blanks in the form of a mixture of graphite with common salt (50/50) weighing 400-500 g, firmware ingot of b-blanks in a cross-helical rolling mill on a mandrel with a diameter of 300 mm with an extraction coefficient μ = 1.22 and a rise in diameter of δ = 1.61% in blanks of size 630 × ext. 315 × 2100-2170 mm, heating the sleeves of preparations from a cold embankment to a temperature of 1250-1260 ° C, supply of lubricant shells inside the lubricant in the form of a mixture of graphite with sodium chloride (50/50) weighing 600-700 g, piercing-rolling of the cylinder blanks in a cross-helical rolling mill mandrel with a diameter of 440 mm with a hood μ = 1.35 and a rise in diameter of δ = 3.18% into sleeves of size 650 × ext. 455 × 2840-2930 mm, rolling the sleeves on TPU8-16 "with pi by igniter mills in caliber 498 mm, cut into rolls with a barrel diameter of 1150 mm, into conversion tubes of 490 × 40 × 7000-7200 mm in size with a drawing coefficient μ = 2.99 and compression in diameter of 24.61%, with the supply of sleeves to the center deformations m = 25-27 mm, a piece of technological waste - seed ends and pilgrim heads with a hot cutting saw, straightening on a six-roll straightening machine for 2-3 passes to a curvature of not more than 5.0 mm for the total length of the conversion pipes, heat treatment - austenization, pipe cutting into two equal lengths, machining - boring and turning y into conversion billet pipes of sizes 474 × 26 × 3500-3600, 474 × 24 × 3500-3600, 474 × 22 × 3500-3600 and 474 × 20 × 3500-3600 mm, rolling of mechanically processed conversion pipes at a 450 goods pipes along the routes: 474 × 20 × 3500-3600 --- 426 × 16 × 4500-4600 --- 377 × 12 × 6400-6550 --- 325 × 8 × 10700-10900 and 325 × 9 × 9500-9700 mm with drawing coefficients μ, respectively, 1.38, 1.50, 1.73 and 1.54; 474 × 22 × 3500-3600 --- 426 × 18 × 4400-4500 --- 377 × 14 × 6000-6200 --- 325 × 10 × 9300-9600 and 325 × 11 × 8500-8700 mm with drawing coefficients μ 1.35, 1.45, 1.61 and 1.47, respectively; 474 × 24 × 3500-3600 --- 426 × 20 × 4300-4400 --- 377 × 16 × 5700-5850 --- 325 × 12 × 8400-8600 and 325 × 13 × 7800-8000 mm with drawing coefficients μ 1.33, 1.41, 1.54 and 1.42, respectively; 474 × 25 × 3500-3600 --- 426 × 22 × 4250-4350 --- 377 × 18 × 5470-5600 --- 325 × 14 × 7700-7900 mm with drawing coefficients μ, respectively, 1.31, 1 , 37 and 1.48, heat treatment of cold-rolled pipes and their acceptance for compliance with the requirements of TU 14-3R-197-2001. At the same time, first the machining of hot rolled steel tubes measuring 490 × 40 × 3500-3600 mm in size to 474 × 26 mm, and then in sizes 474 × 24, 474 × 22 and 474 × 20 mm.

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 electroslag remelting ingots, turning them into ingots-blanks of size 620 × 1750 ± 25 mm, drilling in ingots-blanks of a central hole with a diameter of 115 ± 5 mm, heating the ingot blanks to a temperature of 1250-1260 ° C; feeding into the central drilling of the ingot blanks a lubricant in the form of a mixture of graphite with table salt (50/50) weighing 400-500 g; piercing the ingot blanks in a cross-helical rolling mill with a diameter of 300 mm with a hood μ = 1.22 and a rise in diameter of δ = 1.61% in blanks 630 × ext. 315 × 2100-2170 mm, heating the blanks from a cold embankment to a temperature of 1250-1260 ° C , inward supply of sleeve shells of a lubricant in the form of a mixture of graphite with sodium chloride (50/50) weighing 600-700 g, piercing-rolling of the shell blanks in a cross-helical rolling mill on a mandrel with a diameter of 440 mm with an extraction coefficient μ = 1.35 and a diameter rise of δ = 3.18% into sleeves measuring 650 × ext. 455 × 2840-2930 mm, rolling the sleeves on TPU 8-16 "with pilgrim mills in caliber 498 mm, cut into rolls with dia with a barrel meter of 1150 mm, into conversion pipes of 490 × 40 × 7000-7200 mm in size with a drawing coefficient μ = 2.99 and compression in diameter of 24.61%, with the supply of sleeves to the deformation zone m = 25-27 mm, a piece of technological waste - seed ends and pilgrim heads with a hot cutting saw, straightening on a six-roll straightening machine for 2-3 passes to a curvature of not more than 5.0 mm for the total length of the conversion pipes, heat treatment - austenization, pipe cutting into two equal lengths, machining - boring and turning into conversion billet pipes of size 474 × 26 × 26 × 3500-3600, 474 × 24 × 3500-3600, 474 × 22 × 3500-3600 and 474 × 20 × 3500-3600 mm, rolling mechanically processed conversion pipes at the KhPT 450 mill into commodity pipes along the routes: 474 × 20 × 3500-3600 --- 426 × 16 × 4500-4600 --- 377 × 12 × 6400-6550 --- 325 × 8 × 10700-10900 and 325 × 9 × 9500-9700 mm with drawing coefficients μ, respectively, 1.38, 1.50, 1.73 and 1.54; 474 × 22 × 3500-3600 --- 426 × 18 × 4400-4500 --- 377 × 14 × 6000-6200 --- 325 × 10 × 9300-9600 and 325 × 11 × 8500-8700 mm with drawing coefficients μ 1.35, 1.45, 1.61 and 1.47, respectively; 474 × 24 × 3500-3600 --- 426 × 20 × 4300-4400 --- 377 × 16 × 5700-5850 --- 325 × 12 × 8400-8600 and 325 × 13 × 7800-8000 mm with drawing coefficients μ 1.33, 1.41, 1.54 and 1.42, respectively; 474 × 26 × 3500-3600 --- 426 × 22 × 4250-4350 --- 377 × 18 × 5470-5600 --- 325 × 14 × 7700-7900 mm with drawing coefficients μ, respectively, 1.31, 1 , 37 and 1.48, heat treatment of cold-rolled pipes and their acceptance for compliance with the requirements of TU 14-3R-197-2001. At the same time, first machining of the hot-rolled chimneys of 490 × 40 × 3500-3600 mm in size is performed at a size of 474 × 26 mm, and then at sizes of 474 × 24, 474 × 22 and 474 × 20 mm.

Thus, these differences allow us to conclude that the criterion of "inventive step" is met.

The method was tested at Chelyabinsk Tube Rolling Plant OJSC on a tube rolling plant with 8-16 "pilgrim mills when rolling redacting tubes 490 × 40 × 7000 mm in size from EShP ingots 620 × 115 × 1750 mm in size 08Kh18N10T-Sh steel with subsequent boring and turning them into billet pipes with a size of 474 × 22 × 3500 mm and rolling them at the KhPT 450 mill into commodity pipes along the route: 474 × 22 × 3500 --- 426 × 18 × 4400 --- 377 × 14 × 6000-- -325 × 10 × 9300 mm with drawing coefficients μ, respectively, of 1.35, 1.45 and 1.61 (the proposed technology). According to the existing technology, ingots-blanks ESR size 500 × 100 × 1750 mm were sewn in a cross-screw rolling mill into sleeves of 520 × ext. 315 × 2400 mm in size, which were rolled on 8-16 "TPU with pilgrim mills into 346 × 32 × 8000 mm pig tubes. Conversion pipes were cut into two parts of equal length, bored and turned into commodity pipes measuring 325 × 10 × 4000 mm. Data on the technological parameters of the production of commodity pipes with a size of 325 × 10 mm from ingots and blanks of ESR steel 08Kh18N10T-Sh grade according to the proposed and existing technologies are given in table 1.

Data on the technological parameters of the production of commodity pipes with a size of 325 × 10 mm from ingots and blanks of ESR steel 08Kh18N10T-Sh grade according to the proposed and existing technologies are given in table 1.

Figure 00000001

The table shows that, according to the existing technology, three ingots-blanks of ESRs with a size of 500 × 100 × 1750 mm with a total weight of 8100 kg were set into production. Billet ingots 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 drawing coefficient μ = 1.37 and a diameter rise of δ = 4.0% in sleeves of size 520 × ext. 315 × 2400 mm, which were rolled at 8-16 "TPU with pilgrim mills into 346 × 32 × 8000 mm size conversion pipes. The conversion pipes were straightened in a six-roll straightening machine and heat-treated. As with the existing equipment of ChTPZ OJSC »It is possible to bore and grind conversion pipes with a length of not more than 6000 mm, then The individual pipes were cut into two pipes of equal length, bored and turned into commodity pipes measuring 325 × 10 × 4000 mm, 6 pipes with a size of 325 × 10 × 4000 mm and a total weight of 1863 kg were adopted in accordance with TU 14-3P-197-2001. The expenditure coefficient of the metal in the pipes of this batch was 4.348.

According to the proposed technology, 3 ESR ingots-billets with a size of 620 × 115 × 1750 mm and a total weight of 12012 kg were set into production, which were heated in a methodical furnace to a temperature of 1250-1260 ° C, stitched in a cross-helical mill on a mandrel with a diameter of 300 mm with an extraction coefficient μ = 1.22 and a diameter rise of δ = 1.61% in blanks 630 × in. 315 × 2135 mm in size. The billet sleeves from a cold embankment were heated in a methodical furnace to a temperature of 1250-1260 ° C, stitched - rolled out in a helical rolling mill on a mandrel with a diameter of 440 mm with a hood μ = 1.35 and a rise in diameter of δ = 3.18% in sleeves measuring 650 × ext. 455 × 2890 mm. The sleeves were rolled on 8-16 "TPU with pilgrim mills in caliber 498 mm rolls with a barrel diameter of 1150 mm in pig tubes 490 × 40 × 7000 mm in size with a hood μ = 2.99, diameter reduction δ = 24.61% and s feed sleeves in the deformation zone m = 25-26 mm, Pipes straightened on a six-roll straightening machine for 2-3 passes to curvature of not more than 5.0 mm for the total length of the pipes.

After heat treatment - austenization, the conversion pipes are cut into two slots of equal length, bored and turned into conversion billets of 474 × 22 × 3500 mm in size. Machined billet pipes were sent to workshop No. 5 and rolled on the KhPT 450 mill to commodity pipes along the routes: 474 × 22 × 3500 --- 426 × 18 × 4400 --- 377 × 14 × 6000 --- 325 × 10 × 9300 mm with hoods μ, respectively 1.35, 1.45 and 1.61. Six pipes 325 × 10 × 9300 mm in size with a total weight of 4332 kg are accepted in accordance with TU 14-3R-197-2001. The expenditure coefficient of the metal in the pipes of this batch was 2.773. Thus, in the production of pipes of 325 × 10 mm in size according to the proposed technology (method), a decrease in the cost coefficient of expensive metal per ton of finished pipes by 1575 kg, an increase in length by 2.3 times and a decrease in the roughness of the outer and inner surfaces of the pipes are obtained.

Using the proposed method for the production of seamless cold-rolled pipes of 325 × 8-14 mm in size from 08Kh18N10T-Sh steel for nuclear power facilities will significantly reduce the consumption of expensive metal, reduce the roughness of the outer and inner surfaces, increase the productivity of TPU 8-16 ", significantly increase the length of the pipes and therefore reduce the cost of pipes.

Claims (2)

1. Method for the production of seamless cold-rolled pipes 325 × 8-14 mm in size from 08Kh18N10T-Sh steel, including casting of electroslag remelting ingots, turning them into 620 × 1750 ± 25 mm ingots-blanks, drilling in ingots-blanks of a central hole with a diameter of 115 ± 5 mm, heating the ingot blanks to a temperature of 1250-1260 ° C, feeding into the central hole of the ingot blanks a lubricant weighing 400-500 g in the form of a mixture of graphite with sodium chloride in a ratio of 50/50, piercing the ingot blanks in the mill transversely screw rolling on a mandrel with a diameter of 300 mm with in with a slurry μ = 1.22 and a diameter rise of δ = 1.61% in the blanks 630 × in. 315 × 2100-2170 mm, heating the blanks from a cold embankment to a temperature of 1250-1260 ° C, feeding in the sleeves -workings of grease weighing 600-700 g in the form of a mixture of graphite with sodium chloride in a ratio of 50/50, firmware-rolling of sleeve blanks in a cross-helical rolling mill on a mandrel with a diameter of 440 mm with a draw ratio μ = 1.35 and a rise in diameter δ = 3.18% in sleeves of size 650 × ext. 455 × 2840-2930 mm, rolling of sleeves on TPU 8-16 "with pilgrim mills in caliber 498 mm, cut into rolls with a diameter of b glasses 1150 mm, into hot-rolled chimneys measuring 490 × 40 × 7000-7200 mm with a drawing coefficient μ = 2.99 and compression in diameter of 24.61%, with the supply of sleeves to the deformation zone m = 25-27 mm, a piece of technological waste - seed ends and pilgrim heads with a hot cutting saw, straightening on a six-roll straightening machine for 2-3 passes to a curvature of not more than 5.0 mm for the length of the conversion pipe, austenization, pipe cutting into two equal lengths of 490 × 40 × 3500-3600 mm, machining - boring and turning of cut pipes into conversion billet pipes of size 474 × 26 × 3500-3600, 474 × 24 × 3500-3600, 474 × 22 × 3500-3600 and 474 × 20 × 3500-3600 mm, rolling of machined conversion billets at the KhPT mill into commodity pipes along the routes: 474 × 20 × 3500-3600-- -426 × 16 × 4500-4600 --- 377 × 12 × 6400-6550 --- 325 × 8 × 10700-10900 and 325 × 9 × 9500-9700 mm with drawing coefficients μ, respectively, 1.38, 1, 50, 1.73 and 1.54; 474 × 22 × 3500-3600 --- 426 × 18 × 4400-4500 --- 377 × 14 × 6000-6200 --- 325 × 10 × 9300-9600 and 325 × 11 × 8500-8700 mm with drawing coefficients μ 1.35, 1.45, 1.61 and 1.47, respectively; 474 × 24 × 3500-3600 --- 426 × 20 × 4300-4400 --- 377 × 16 × 5700-5850 --- 325 × 12 × 8400-8600 and 325 × 13 × 7800-8000 mm with drawing coefficients μ 1.33, 1.41, 1.54 and 1.42, respectively; 474 × 26 × 3500-3600 --- 426 × 22 × 4250-4350 --- 377 × 18 × 5470-5600 --- 325 × 14 × 7700-7900 mm with drawing coefficients μ, respectively, 1.31, 1 , 37 and 1.48; and heat treatment of cold rolled pipes.
2. The method according to p. 1, characterized in that during the machining of the cut pig tubes of size 490 × 40 × 3500-3600 mm, first they are machined to a size of 474 × 26 × 3500-3600 mm and then to sizes 474 × 24 × 3500 -3600, 474 × 22 × 3500-3600 and 474 × 20 × 3500-3600 mm.
RU2016110203A 2016-03-22 2016-03-22 METHOD FOR PRODUCING SEAMLESS COLD DRAWN PIPES OF 325x8-14 mm SIZE MADE OF STEEL OF "08Х18Н10Т-Ш" GRADE RU2615920C1 (en)

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Citations (4)

* 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
RU2257271C1 (en) * 2004-03-03 2005-07-27 ООО "Специальные Стали и Сплавы" Method for making elongated conversion large- and mean- diameter tubes of centrifugally cast hollow billets and electroslag refining ingots of steels for telescopic systems (periscopes of submarines)
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
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
RU2257271C1 (en) * 2004-03-03 2005-07-27 ООО "Специальные Стали и Сплавы" Method for making elongated conversion large- and mean- diameter tubes of centrifugally cast hollow billets and electroslag refining ingots of steels for telescopic systems (periscopes of submarines)
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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