RU2278750C2 - Method for producing hot rolled conversion large- and mean-diameter tubes of hard-to-form steels and alloys in tube rolling plants with pilger mills - Google Patents

Method for producing hot rolled conversion large- and mean-diameter tubes of hard-to-form steels and alloys in tube rolling plants with pilger mills Download PDF

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RU2278750C2
RU2278750C2 RU2004121627/02A RU2004121627A RU2278750C2 RU 2278750 C2 RU2278750 C2 RU 2278750C2 RU 2004121627/02 A RU2004121627/02 A RU 2004121627/02A RU 2004121627 A RU2004121627 A RU 2004121627A RU 2278750 C2 RU2278750 C2 RU 2278750C2
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rolling
sleeves
mill
pilger
pilgrim
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RU2004121627/02A
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RU2004121627A (en
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нов Анатолий Васильевич Сафь (RU)
Анатолий Васильевич Сафьянов
Исаак Иосифович Вольберг (RU)
Исаак Иосифович Вольберг
Леонид Игнатьевич Лапин (RU)
Леонид Игнатьевич Лапин
Сергей Васильевич Ненахов (RU)
Сергей Васильевич Ненахов
Игорь Александрович Романцов (RU)
Игорь Александрович Романцов
Николай Григорьевич Дановский (RU)
Николай Григорьевич Дановский
Валерий Александрович Головинов (RU)
Валерий Александрович Головинов
Николай Петрович Климов (RU)
Николай Петрович Климов
Александр Юрьевич Матюшин (RU)
Александр Юрьевич Матюшин
Павел Александрович Гриценко (RU)
Павел Александрович Гриценко
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ОАО "Челябинский трубопрокатный завод"
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Abstract

FIELD: rolled tube production, namely production of hot rolled and conversion large- and mean-diameter tubes of corrosion-proof hard-to-form steels and alloys, possibly in tube rolling plants with pilger mills.
SUBSTANCE: method comprises steps of turning ingots and forged blanks; drilling central opening with diameter 100 +-5 mm; heating them till yielding temperature; piercing for further rolling out in skew rolling mill to sleeves; rolling sleeves in pilger mill to hot rolled conversion tubes with lowered pilger heads and relatively thick wall at using for after-rolling pilger heads of supporting carbonaceous rings. First piercing of electroslag refining ingots and forged blanks in skew rolling mill is realized at bottom end turned forward; second piercing- rolling out is realized by means of shrinkage end turned forward. Tubes are rolled in pilger mill to sleeves at relation D/S =6.5 -8.0 with elongation degree μ ≤ 4.5. Blank is guided to pilger mill at feed value consisting of 0.4 - 0.6 of feed value of stabilized rolling process along tube length equal to path of roll away of feeding apparatus. Rolling out-after rolling of pilger head is realized in end part of sleeve 200 - 300 mm before beginning rolling out of supporting carbonaceous ring at feed value 1.1 - 1.3.
EFFECT: high quality of hot rolled conversion tubes of hard-to-form steels and alloys, lowered metal consumption of conversion "electroslag refining ingot- hot rolled tube", improved efficiency of pilger mill due to elimination of additional heating of curved sleeves, reduced cost of tubes.
3 cl, 1 tbl

Description

The invention relates to pipe rolling production, and in particular to a method for the production of hot rolled in accordance with GOST 9940 and conversion pipes of large and medium diameters from corrosion-resistant hardly deformable grades of steel and alloys, and can be used in their production in pipe rolling plants with pilgrim mills.

In the practice of pipe production, there is a known method of manufacturing conversion pipes of large and medium diameters in tube rolling plants with pilgrim mills from steel grades 08X18H12T, 08X10H20T2, including heating hollow (centrifugal cast) billets and rolling them 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 TU14-3-743-78." TI 158 Tr. TB1-6-94. "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 hollow centrifugal cast billet of low quality due to the lack of firmware technology on the cross helical mills of workpieces with a diameter of more than 500 mm with a high content of Cr and Ni, as well as due to the low drive power of the piercing mill.

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 to stop the engine of the piercing mill and terminate 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 size 325 × 12 according to GOST mm from steel grade 06KHN28 MDT (EI-943), including drilling and boring of ingots of 460 × 1600 mm in diameter to 275 and 325 + 5 / -0 mm, heating them to ductility temperature, rolling in a pilgrim mill in 325 × 40 pipes and 325 × 25 mm followed by by turning it and boring it to pipes with specified geometric dimensions (Protocol No. 1031 for agreeing on the conditions for the supply of pipes made of steel 20Kh25N25TYu-Sh and 06KhN28MDT dated 12/14/2000 and a letter indicating pilot pilot rolling of conversion tubes of 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 pipes defects are formed in the form of flaws, tightening is expensive, even with increased taper, and this, in turn, leads to increased consumption of expensive metal.

The closest technical solution is a method for the production of pipes from hardly deformable steel grades (Patent No. 2175899, Cl. 7 V 21 V 21/00), including planting workpieces from hardly deformable steel and alloys with a diameter of 380-500 mm in heating furnaces, holding at a temperature of 500 -550 ° C for 70-95 minutes, depending on the diameter, after which it is heated to a temperature of 1120-1140 ° C at a speed of 1.4-1.5 degrees / min, piercing the blanks (ESR ingots) into sleeves size in size in diameter at a speed of rotation of the work rolls 25-40 rpm./min on a mandrel with a diameter, providing vayuschim pilger reduction is at least 25 mm.

The disadvantage of this method is the impossibility of flashing on the mills of oblique rolling of sleeves from hard-deformed grades of steel and alloys on a mandrel of more than 250 mm, because due to increased loads, the engine of the piercing mill stops (turns off). Of the sleeves 460 × 265 mm in size, sewn on a mandrel with a diameter of 250 mm, it is possible to roll pipes with a diameter of 273 mm with a minimum wall thickness of 16-17 mm, and pipes with a diameter of 325 mm only with a wall of more than 40 mm, because the rolling process on a pilgrim mill should be performed on mandrels of no more than 239/240 mm. The production process of pipes with a diameter of more than 325 mm (377-500) mm by this method is impossible.

The objective of the proposed method for the production of hot-rolled conversion pipes of large and medium diameters from hard-to-deform steel grades and alloys in tube-rolling plants with pilgrim mills from blanks and ingots of ESR is to obtain high-quality pipes in accordance with GOST 9940, conversion pipes with a diameter of up to 500 mm, increase the productivity of mills and reduce the consumption ratio metal during redistribution a billet (EShP ingot) is a pipe in accordance with GOST 9940, an ESH ingot is a conversion pipe under the HST for the manufacture of pipes in accordance with GOST 9941 or under mechanical th processing (turning and boring) according to the technical conditions.

The technical result is achieved by the fact that in the known method for the production of hot-rolled conversion pipes of large and medium diameters from hard-to-deform 3 grades of steel and alloys in pipe rolling plants with pilgrim mills, including turning the ESR ingots and forged blanks, drilling a central hole with a diameter of 100 ± 5 mm, heating them to the temperature of ductility, firmware followed by rolling in the mill oblique rolling into sleeves and rolling the sleeves on a pilgrim mill in hot-rolled steel tubes with reduced pilings with an imperial head and a relatively thick wall using carbon-based underlay rings for rolling the pilgrim heads, the first piercing of the ESR ingots and forged blanks in the oblique rolling mill is carried out with the bottom end forward, and the second piercing-rolling with the shrink end forward, the pipes are rolled from the sleeves with the ratio of the diameter to the wall thickness D / S = 6.5-8.0 with a hood μ≤4.5, and the seed on the pilgrim mill is fed with a feed value equal to 0.4-0.6 of the feed rate of the steady rolling process, pipe length equal to the rollback path of the feeding apparatus, and the rolling-rolling of the pilgrim head at the end section of the liner 200-300 mm, before the start of the running of the underlay carbon ring, with a feed value of 1.1-1.3.

The essence of the method lies in the fact that in order to reduce the curvature of the front ends of the sleeves after rolling, and therefore to exclude reheating and increased the difference between the conversion tubes on the pilgrim mill, the first piercing of the ESR ingots and forged billets in the oblique rolling mill is done with the bottom end forward, and the second firmware-rolling - shrink end forward, because twisting during rolling in the opposite direction will lead to a decrease in curvature, and not to increase, as with the existing method, in order to reduce the load on the drive and rolls of the pilgrim mill, pipes are rolled from sleeves with a diameter / wall thickness ratio of D / S = 6.5- 8.0 with a hood μ≤4.5, and to exclude breakage of safety bolts, spindles and reduce tightening of the mandrels, the seed on the pilgrim mill is fed with a feed value equal to 0.4-0.6 of the feed rate of the steady rolling process along the pipe length, equal rollback path apparatus, and running-rolling the pilgrim head at the end portion of the sleeve 200-300 mm, before the start of running the underlay carbon ring, with a feed value of 1.1-1.3.

Comparative analysis with the prototype showed that the inventive method for the production of hot-rolled conversion tubes of large and medium diameters from hard-to-deform steel grades and alloys in tube-rolling plants with pilgrim mills differs in that the first piercing of ESR ingots and forged billets in the oblique rolling mill is carried out with the bottom end forward, and the second firmware-rolling with the shrink end forward, pipe rolling on a pilgrim mill is made from sleeves with a diameter to wall thickness ratio of D / S = 6.5-8.0 with a hood μ≤4.5, and the cost the taste on the pilgrim mill is carried out with a feed value equal to 0.4-0.6 of the feed value of the steady rolling process, on a pipe length equal to the rollback path of the feeding apparatus, and the rolling-rolling of the pilgrim head at the end section of the sleeve 200-300 mm, before running in the underlay carbon ring, with a feed rate of 1.1-1.3.

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 the art did not allow them to identify 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 of "ChTPZ" OJSC when rolling pig tubes of 426 × 26 mm in size made of 12Kh18N10T steel and 483 × 29 mm from 10Kh17N13M2T steel.

Comparative data on the flashing of ESR ingots and rolling of hot-rolled conversion tubes from hard-to-deform grades of steel 12Kh18N10T and 10Kh17N13M2T at TPA 8-16 of ChTPZ OJSC with pilgrim mills according to the existing and proposed technologies are given in the table. The table shows that 10 were set for production ESR ingots of 490 × 12 × 1600 mm in size of 08Kh18N12T steel and 10 10Kh17N13M2T steel ingots of 585 × 120 × 1600 mm in size. Five ingots of each steel grade were rolled using existing technology into conversion pipes of 426 × 26 and 483 × 29 mm, and five bars pipes of this size according to the proposed technology. Rolling of pipes of size 426 × 26 mm from 08Kh18N10T steel according to the existing technology was carried out with the following parameters: heating ESR ingots of size 490 × 120 × 1600 mm to a temperature of 1220-1250 ° C, the first insertion with the bottom end forward on a mandrel with a diameter 275 mm in sleeves measuring 520x290x2570 mm with hood μ = 1.61, cooling the sleeves and cold repair (if necessary), heating the sleeves to a temperature of 1220-1250 ° C, second firmware (rolling) with the bottom end forward on a mandrel with a diameter of 400 mm in sleeves size 575 × 415 × 3020 mm with feed μ = 1.18, rolling the sleeves on the pilgrim mill in pipes of 426 × 26 mm in size with carbon backing rings with a fixed feed rate of m = 18-20 mm with an extract of μ = 3.8 and a ratio of D / S = 7.2. The front ends of all liners had an increased curvature. One sleeve due to curvature, as the mandrel did not enter the sleeve, was not rolled. The sleeve was heated in a furnace to a temperature of 1230 ° C and rolled into a pipe. The front ends of the pipes due to the curvature of the sleeves had an increased difference. The expenditure coefficient of metal for hire in this batch amounted to 1,365. The second half (5 ESR ingots) was rolled according to the proposed technology, namely: the ingots were heated to a temperature of 1220-1250 ° C, the first flashing with the bottom end forward on a mandrel with a diameter of 250 mm in sleeves measuring 520 × 265 × 2400 mm with a hood μ = 1 , 50, cooling the sleeves and cold repair (if necessary), heating the sleeves to a temperature of 1220-1250 ° C, the second firmware (rolling) on a mandrel with a diameter of 400 mm shrink end forward into sleeves of size 570 × 415 × 3150 mm with a hood μ = 1 , 31, rolling sleeves on a pilgrim mill in pipes of 426x26 mm in size with carbon E rings. The seed and rolling of the front end of the pipes at a length of 1250-1300 mm was performed with feeds of m = 8-10 mm, rolling of pipes with a fixed feed rate of m = 18-20 mm, and the pilgrim heads were run in with increased feeds of m = 22-24 mm, s extractor hood μ = 3.67 and the ratio D / S = 7.4. The sleeves were relatively even, freely dressed on the mandrel. Pipes according to wall thickness met the requirements of GOST 9940 (conventional accuracy) + 12.5 / -15.0%. The expenditure ratio of metal for hire amounted to 1.245. Similarly, rolling of pipes with a size of 483 × 29 mm from 10Kh17N13M2T steel was carried out. According to the existing technology, ESR ingots of 585 × 120 × 1600 mm in size were grinded and bored to a size of 565 × 270 × 1600 mm, heated to a temperature of 1170–1190 ° С, stitched with the bottom end forward on a mandrel with a diameter of 350 mm in sleeves 580 × 365 × 1940 mm in diameter with a hood μ = 1.21, the hot sleeves were inserted into the furnace, the sleeves were heated to a temperature of 1170-1190 ° C, stitched (rolled) on a mandrel with a diameter of 450 mm with the bottom end forward into sleeves of size 600 × 465 × 2740 mm with a hood μ = 1.41 . The sleeves were rolled into pipes with carbon rings with a fixed feed rate of m = 20-22 mm with an extract of μ = 2.73 and a ratio of D / S = 8.9. Due to the increased curvature of the front ends, two sleeves could not be put on the mandrel, and they were rolled into pipes after additional heating and turning over the furnace. Due to the increased curvature of the liners, the front ends of the pipes had an increased difference. The expenditure coefficient of metal for hire amounted to 1.315, and taking into account turning and boring, 1.773. According to the proposed technology, ESR ingots with a size of 585 × 120 × 1600 mm were heated to a temperature of 1170-1190 ° C, stitched in the piercing mill with the bottom end forward on a mandrel with a diameter of 300 mm in sleeves with a size of 600 × 315 × 2010 mm with a draw ratio μ = 1.21 , the sleeves, after flashing, were heated in the furnace to a temperature of 1170–1190 ° С and were stitched (rolled) with the shrink end forward on a mandrel with a diameter of 450 mm into sleeves 620 × 465 × 3100 mm in size with a hood μ = 1.55. Sleeves after rolling were relatively even and freely put on the mandrel. Pipe rolling was carried out with carbon rings. Seeding and rolling of the front ends of the pipes at a length of 1100-1200 mm (rollback path of the feeding apparatus) was carried out with feeds m = 9-12 mm, rolling of pipes with a fixed feed rate of 20-22 mm, and rolling of the pilgrim heads with feeds m = 24-26 mm, with a hood μ = 3.10 and the ratio D / S = 8.0. Pipes according to wall thickness met the requirements of GOST 9940 (conventional accuracy) + 12.5 / -15.0%. The expenditure ratio of metal for hire amounted to 1.275 .

Using the proposed method made it possible to master the production of high-quality hot-rolled conversion tubes of large and medium diameters from hardly deformable steel and alloy grades on an 8-16 "pipe rolling unit with pilgrim mills, significantly reduce the expenditure coefficient of the metal during the redistribution of an ESR ingot - hot-rolled pipe, and increase the performance of the pilgrim mill due to elimination of additional heating of the curved sleeves, and therefore, reduce the cost of pipes according to GOST 9940 and redistributed pipes under the HPT according to GOST 9941.

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Claims (3)

1. Method for the production of hot-rolled conversion pipes of large and medium diameters from hard-to-deform grades of steel and alloys in tube-rolling plants with pilgrim mills, including turning ESR ingots and forged billets, drilling a central hole with a diameter of (100 ± 5) mm, heating them to ductility temperature, flashing with subsequent rolling in the mill oblique rolling in the sleeves and rolling the sleeves on the pilgrim mill in hot-rolled conversion tubes with a reduced pilgrim head and a relatively thick wall using zovaniem for dokatki pilger heads backer carbon rings, wherein the first firmware ESR ingots and forged billets in rolling mill manufacture oblique bottom end first, and second-firmware-rollers shrink endwise.
2. The method according to claim 1, characterized in that the rolling of the pipes on the pilgrim mill is made of sleeves with a diameter to wall thickness ratio of D / S = 6.5-8.0 with an extractor μ≤4.5.
3. The method according to claim 1, characterized in that the seed on the pilgrim mill is carried out with a feed value equal to 0.4-0.6 of the feed value of the steady rolling process, on a pipe length equal to the rollback path of the feeding apparatus, and the rolling-rolling of the pilgrim heads on the end section of the sleeve 200-300 mm before the start of the running in the underlay carbon ring with a feed value of 1.1-1.3.
RU2004121627/02A 2004-07-14 2004-07-14 Method for producing hot rolled conversion large- and mean-diameter tubes of hard-to-form steels and alloys in tube rolling plants with pilger mills RU2278750C2 (en)

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RU2570152C2 (en) * 2014-02-04 2015-12-10 Открытое акционерное общество "Челябинский трубопрокатный завод" PRODUCTION OF 550×25-30 mm SEAMLESS HOT-ROLLED PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERHIGH STEAM PARAMETERS OF "10Х9МФБ-Ш"-GRADE STEEL
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RU2570150C1 (en) * 2014-07-29 2015-12-10 Открытое акционерное общество "Челябинский трубопрокатный завод" (ОАО "ЧТПЗ") METHOD OF PRODUCTION OF 325×31-60 mm SEAMLESS PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH CRITICAL AND SUPERCRITICAL STEAM PARAMETERS OF STEEL GRADE "10Х9МФБ-Ш"
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