RU2615921C1 - METHOD OF PRODUCING SEAMLESS MACHINED PIPES WITH 530x8-12 mm SIZE FROM THE STEEL GRADE 08X18H10T - Google Patents

METHOD OF PRODUCING SEAMLESS MACHINED PIPES WITH 530x8-12 mm SIZE FROM THE STEEL GRADE 08X18H10T Download PDF

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RU2615921C1
RU2615921C1 RU2016110206A RU2016110206A RU2615921C1 RU 2615921 C1 RU2615921 C1 RU 2615921C1 RU 2016110206 A RU2016110206 A RU 2016110206A RU 2016110206 A RU2016110206 A RU 2016110206A RU 2615921 C1 RU2615921 C1 RU 2615921C1
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size
pipes
ingots
diameter
hot
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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
    • B21B19/00Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling Diescher mills, Stiefel disc piercers, Stiefel rotary piercers
    • B21B19/06Rolling hollow basic material, e.g. Assel mills

Abstract

FIELD: metallurgy.
SUBSTANCE: method comprises the casting of hollow ingots by electroslag remelting with 740×in.500×3,200±50 mm, boring and refacing in billet ingots with size of 720×in.520×3200±50 mm, heating the billet ingots in reheat furnaces to the temperature of 1,260-1,270°C, delivery of them into ingot trolley, blowing with compressed air or inert gas, supply inside of billet ingots from two ends of lubricant with mass 2000-2500g in the form of mixture of graphite with sodium chloride in a ratio of 50/50, transportation of hollow billet ingots to the upstream side of the Pilger mill, rolling at Pilger mill into stock with size 550×30×10300-10700 mm, cutting of process wastes: bare ends and pilger heads by hot cutting saw, straightening on a six-roll straightening machine to the curvature of not more than 6.0 mm on the tube stock length, austenitizing, tube stock cutting into two pipes of equal length, mechanical treatment-boring and turning of hot-rolled pipe stock with size 550×30×5150-5350 mm into commercial pipes with size 530×8-12×5150-5350 mm.
EFFECT: reduction of metal consumption in pipes production.
2 cl, 1 tbl

Description

The invention relates to pipe rolling and metallurgical industries, and in particular to a method for the production of seamless hot-deformed machined pipes with a size of 530 × 8-12 mm for nuclear power facilities made of steel grade 08X18H10-Sh of high accuracy.

In the pipe industry, there is a known method for the production of seamless hot-deformed machined pipes with a diameter of 530-550 mm from corrosion-resistant hard-deformed steel grades and alloys on TPU 8-16 "with pilgrim mills, including casting ESR ingots 610 × 1725 ± 25 mm in size, machining - turning of ingots into ingot blanks with a size of 590 ± 5.0 × 1725 mm, drilling in ingot blanks of a central hole with a diameter of 100 ± 5.0 mm, boring of ingot blanks to a size of 590 ± 5.0 × int. 220 ± 5.0 × 1750 ± 25 mm, heating ingot blanks to temperatures plasticity, piercing in a cross-helical rolling mill into billet sleeves measuring 620 × ext. 365 × 1950-2000 mm on a mandrel with a diameter of 350 mm with a diameter rise of δ = 4.0-6.0%, heating of the billet blanks with cold or hot planting to a temperature of ductility, firmware-rolling in a cross-helical rolling mill into sleeves of size 660 × 505-515 × 2950-3100 mm on a mandrel with a diameter of 490-500 mm with a diameter rise of δ = 5.5-6.5 %, rolling of sleeves on TPU 8-16 "with pilgrim mills into redistribution pipes with a diameter of 530-550 mm with a ratio D / S = 13.5-15.0 with an allowance for wall thickness under the mechanics machining-boring and turning, determining the thicknesses of the removed metal layers during turning and boring from the expressions Δ = D / S * K, Δ 1 = D / S * K 1 , where Δ is the thickness of the removed metal layer when turning hot-rolled pipes along the outer surface, mm; Δ 1 - the thickness of the removed metal layer when boring hot rolled pipes on the inner surface, mm; D is the outer diameter of the hot rolled pipes, mm; S is the wall thickness of the hot rolled pipes, mm; K = 0.5-0.7 - coefficient for determining the thickness of the removed metal layer when turning pipes, large values of which apply to pipes with thicker walls; K 1 = 0.4-0.5 - coefficient for determining the thickness of the removed metal layer when boring pipes, large values of which relate to pipes with thicker walls (Patent No. 2387501, July 27, 2010, bull. No. 12).

The disadvantage of this method is that it solves the general issues of the production of seamless hot-deformed pipes from corrosion-resistant hard-deformed steel grades and alloys with a ratio of D / S = 13.5-15.0 for subsequent machining-boring and turning them into commodity pipes with a diameter of 530-550 mm with a wall thickness of more than 20 mm, a length of not more than 4700 mm and does not solve the technological issues of the production of limit and machined pipes of 530 × 8-12 mm in size from steel grade 08X18H10-Sh of increased accuracy in diameter and wall d I nuclear facilities.

In world practice, pipes of size 530 × 8-12 mm of high accuracy from 08Kh18N10-Sh steel have not been manufactured and are not manufactured at tube-rolling plants with pilgrim mills.

In the pipe industry, there is a known method for the production of seamless hot-formed mechanically machined pipes with a diameter of 273-550 mm from carbon steel 20, alloy steels 15GS, 15GS-Sh, 12Kh1MF, 15Kh1M1F, 16GS and 16GS-Sh, for the manufacture of parts and elements of pipelines of TPPs and nuclear power plants using trepanation cylindrical forgings with subsequent boring and turning of a predetermined size with a purity of not lower than R z of 40 microns (TU 1310-030-00212179-2007 "seamless pipes Hot machined from carbon and alloy steels for truboprovo s thermal power plants and nuclear power plants ").

The disadvantages of this method are the large expenditure coefficient of the metal (≈ from 5.4 to 16.5), the value of which increases with decreasing wall thickness of the commodity pipes and increasing diameter, increased complexity and energy consumption associated with heating and forging of ingots weighing more than 12 tons into cylindrical forgings with a length of up to 5.0 m, cutting of the end trim, trimming and turning of the forgings to a predetermined outer diameter, trepanation of forgings-blanks on unique equipment with subsequent boring with a surface finish of at least R z 40 μm and, ka as a result, the increased cost of boiler pipes.

The closest technical solution (prototype) is a method for the production of seamless hot-deformed long pipes with a diameter of 500 mm or more on pipe rolling plants with pilgrim mills for steam boilers, steam pipelines and manifolds of plants with high and supercritical steam parameters (patent RU No. 232322315, class B21V 19 / 04, November 27, 2007), including the casting of hollow ingots by electroslag remelting with the ratio of diameter to wall thickness D / S = K 1 , H = K 2 D and H 1 = K 3 D, where D = 680 is the outer diameter of the hollow ingot of electroslag remelting mm; S is the wall thickness of the hollow ingot of electroslag remelting, mm; K 1 = (4.8–9.2) is a coefficient whose large values are taken for hollow ingots with a smaller wall thickness; N = (3000-3500) - the height of the hollow ingot of electroslag remelting for rolling pipes with a ratio of D / S≤20, mm; K 2 = (4.4-5.2) - the values of the coefficients for rolling pipes with a ratio of D / S≤20; H 1 = (2000-2100) - the height of the hollow ingot of electroslag remelting for rolling pipes with a ratio of D / S≤20, mm; K 3 = (2.9-3.1) - coefficient values for rolling pipes with a ratio of D / S≥20, mm, hollow ingots of electroslag remelting for rolling boiler pipes with a ratio of D / S≥20, cast with an inner diameter of D ext . = D d ± 5.0, where D d is the mandrel diameter, mm, electroslag remelting ingots for rolling boiler pipes are machined and bored into hollow ingots with metal removal of 8 ± 2.0 mm thick to remove welding slag and casting defects , hollow ingots-blanks of electroslag remelting are heated to the temperature of plasticity and rolled on a pilgrim mill into pipes with a ratio D / S≥20 with a tolerance of ± 1.0% in diameter and wall thickness + 15.0 / -10.0%, hollow ingots electroslag remelting for rolling boiler pipes with a ratio D / S≤20 cast with inner diameters of 300 ± 10 mm, which are turned and bored into hollow ingots-blanks with removal of metal with a thickness of 8 ± 2.0 mm to remove welding slag and casting defects, hollow ingots-blanks of electroslag remelting are heated to the plasticity temperature, They are rolled in a cross-helical rolling mill into sleeves on a mandrel with a diameter larger than the mandrel diameter by 15-20 mm and rolled on a pilgrim mill in pipes with a ratio D / S≤20 with a tolerance of ± 1.0% in diameter and a wall thickness of +15.0 / -10.0%.

One of the main disadvantages of the bottom method is that it is aimed at the production of boiler pipes with a diameter of up to 550 mm and does not solve the technological issues of the production of pipes 530 × 8-12 mm in size from steel grade 08X18H10-Sh for nuclear power facilities.

The disadvantages of this method are the dimensions of the hollow ingots ESR, which make it difficult to determine the geometric dimensions of the hollow ingots-blanks for rolling pipes of the required size; the inner diameters of hollow ingots-billets, taking into account the removal of metal with a bore of 8 mm per side, have underestimated results, which when rolling thick-walled pipes leads to tightening mandrels; rolling of pipes with a wall thickness of more than 30 mm is associated with additional firmware-rolling of hollow ingots-blanks in a cross-helical rolling mill, which is likely to lead to increased curvature and difference in sleeves during uneven heating of ingots-blanks in methodical furnaces, and therefore to the difference of the pipes.

The objective of the present invention is the development and implementation of a technological process for the production of seamless hot-formed mechanically machined pipes with a size of 530 × 8-12 mm with a tolerance of ± 0.8% in diameter and ± 10.0% in the wall at Chelyabinsk Tube-Rolling Plant OJSC (short for ChTPZ).

The technical result is achieved by the fact that the method of manufacturing seamless machined pipes of 530 × 8-12 mm in size for nuclear power facilities made of 08Kh18N10-Sh steel includes the casting of hollow ingots by electroslag remelting of 740 × in. 500 × 3200 ± 50 mm in size, boring and turning into ingot blanks with a size of 720 × ext. 520 × 3200 ± 50 mm, heating ingot blanks in methodical furnaces to a temperature of 1260-1270 ° C, dispensing them onto an ingot cart, blowing with compressed air or inert gas, feeding ingot ingots with two ends of 2000-2500 g of a mixture of graphite with p with salt in a ratio of 50/50, transportation of hollow ingots to the entrance side of the pilgrim mill, rolling on a pilgrim mill on conical mandrels with a diameter of 493/499 mm in a caliber 562 mm, cut into rolls with a barrel diameter of 1150 mm, with an angle of lateral discharge on polishing section 24-26 °, into conversion pipes 550 × 30 × 10300-10700 mm in size with a drawing coefficient μ = 3.90, diameter compression Δ = 21.43% and feeding the ingots into the deformation zone m = 20-22 mm, a piece of technological waste - seed ends and pilgrim heads with a hot saw ki, straightening on a six-roll straightening machine using rolling temperature for 2-3 passes to a curvature of not more than 6.0 mm per length of the front pipe, austenization, cutting the front pipe into two pipes of equal length, machining - boring and turning of hot-rolled conversion pipes 550 × 30 × 5150-5350 mm in size into commodity pipes of 530 × 8-12 × 5150-5350 mm in size and their acceptance for compliance with the requirements of TU 14-3R-197-2001, machining of hot rolled steel tubes in size of 550 × 30 × 5150- 5350 mm in commodity machined pipes pro first they produce 530 × 12 mm, then 530 × 11, 530 × 10, 530 × 9 and 530 × 8 mm.

A comparative analysis of the proposed solution with the prototype shows that the claimed method for the production of seamless machined pipes of 530 × 8-12 mm in size for nuclear power facilities made of 08Kh18N10-Sh steel is different from the known one in that hollow ingots are cast using electroslag remelting with a size of 740 × int. 500 × 3200 ± 50 mm, boring and turning into ingot blanks with a size of 720 × ext. 520 × 3200 ± 50 mm, heating ingot blanks in methodological furnaces to a temperature of 1260-1270 ° C, dispensing them to an ingot cart, blowing with compressed air or inert m with gas, feeding into ingots-blanks from two ends 2000-2500 g of a mixture of graphite and sodium chloride in a ratio of 50/50, transporting hollow ingots-blanks to the inlet side of the pilgrim mill, rolling in a pilgrim mill on conical mandrels with a diameter of 493/499 mm in 562 mm caliber with a lateral outlet angle at the polishing section 24-26 °, cut into rolls with a barrel diameter of 1150 mm, into pig tubes of 550 × 30 × 10300-10700 mm in size with a hood μ = 3.90, compression in diameter Δ = 21 , 43% and the supply of ingot blanks to the deformation zone m = 20-22 mm, Dow - seed ends and pilgrim heads with a hot cutting saw, straightening on a six-roll straightening machine using rolling heating temperature for 2-3 passes to a curvature of not more than 6.0 mm per length of the front pipe, austenization, cutting the front pipe into two pipes of equal length, mechanical processing - boring and turning of hot-rolled conversion pipes of size 550 × 30 × 5150-5350 mm into commodity pipes of size 530 × 8-12 × 5150-5350 mm and their acceptance for compliance with the requirements of TU 14-3R-197-2001. At the same time, the machining of hot rolled hot-rolled pipes of 550 × 30 × 5150-5350 mm in size into commodity machined pipes is first performed at a size of 530 × 12 mm, then at a size of 530 × 11, 530 × 10, 530 × 9 and 530 × 8 mm. Thus, these differences allow us to conclude that the criterion of "inventive step" is met.

For the first time in world practice, the method of manufacturing seamless machined pipes of 530 × 8-12 mm in size for nuclear power facilities made of 08Kh18N10-Sh steel was carried out according to the proposed technology in the production of pipes of 530 × 12 × 5250 mm in size by machining with boring and turning of hot rolled pipes of size 550 × 30 × 5250 mm, rolled at 8-16 "TPU with pilgrim mills at Chelyabinsk Tube Rolling Plant OJSC from hollow ingot blanks EShP with a size of 720 × ext. 520 × 3200 mm. Since pipes of this assortment on TPU with pilgrims and mills have not been made, then rolling comparatives were not conducted.

Two hollow ESR ingots-blanks with a size of 720 × ext. 520 × 3200 mm with a total weight of 9.780 tons were put into production, which were heated in a methodical furnace to a temperature of 1260-1270 ° С. After issuing them to the ingot trolley, the ingot blanks were purged with compressed air. Lubrication of ingots-blanks was carried out by feeding a mixture of graphite with sodium chloride in a ratio of 50/50 of 1000-1250 g inside from each end. Then, the ingot blanks were supplied by crane to the inlet side of the pilgrim mill. Rolling in a pilgrim mill was performed in 562 mm caliber with a lateral outlet angle at a polishing section of 25 °, cut into rolls with a barrel diameter of 1150 mm, into conversion tubes of 550 × 30 × 10500 mm in size on conical mandrels with a diameter of 493/499 mm with a drawing coefficient μ = 3.90, diameter reduction Δ = 21.43% and the supply of ingots-blanks to the deformation zone m = 20-22 mm. After cutting off the technological waste - seed ends and pilgrim heads, straightening on a six-roll straightening machine was carried out in 2-3 passes using the temperature of the pipes from rolling heating. The curvature of the pipes after the correct machine was determined by eye. After cooling the pipes, the maximum pipe curvature ranged from 4.0 to 5.0 mm. After heat treatment - austenization, pipes of size 550 × 30 × 10500 mm were cut into two pipes of equal length. Converted hot-rolled pipes were bored, turned and adopted according to TU 14-3R-197-2001. Data on the production of seamless machined pipes with a size of 530 × 12 × 5250 mm from steel grade 08Kh18N10-Sh according to the proposed technology are shown in table 1.

Figure 00000001

The table shows that the expenditure coefficient of the metal in the production of pipes of 530 × 12 × 5250 mm in size from hollow ingots-blanks of 720 × in. 520 × 3200 mm was 3.039.

Thus, the use of the proposed method made it possible for the first time in world practice at TPU 8-16 "to carry out the production of pig tubes with a size of 550 × 30 × 10300-10700 mm from hollow ingots-blanks with a size of 720 × ext. 520 × 3200 ± 50 mm with subsequent mechanical processing - boring and turning them into commodity seamless machined pipes with a diameter of 530 mm and wall thicknesses from 8 to 12 mm for nuclear power facilities.The pipes in terms of geometric dimensions and surface quality fully meet the requirements of TU 14-3R-197-2001.

Claims (2)

1. Method for the production of seamless machined pipes 530 × 8-12 mm in size from 08Kh18N10-Sh steel, including the casting of hollow ingots by electroslag remelting of 740 × ext. 500 × 3200 ± 50 mm in size, boring and turning into 720 × ingots ext. 520 × 3200 ± 50 mm, heating the ingot billets in methodical furnaces to a temperature of 1260-1270 ° C, dispensing them to the ingot trolley, purging with compressed air or inert gas, feeding the ingot billets from two ends of a lubricant weighing 2000-2500 g in the form of a mixture of graphite with sodium chloride in a ratio of 50/50, transportation hollow ingots-blanks on the entrance side of the pilgrim mill, rolling on a pilgrim mill on conical mandrels with a diameter of 493/499 mm in a caliber 562 mm, cut into rolls with a barrel diameter of 1150 mm, with an angle of transverse release on the polishing section of 24-26 ° into the transfer tubes 550 × 30 × 10300-10700 mm in size with a drawing coefficient μ = 3.90, diameter compression Δ = 21.43% and feeding ingot blanks to the deformation zone m = 20-22 mm, a piece of technological waste - seed ends and pilgrim heads with a hot cutting saw, straightening on a six-roll straightening machine with using the temperature of rolling heating for 2-3 passes to a curvature of not more than 6.0 mm per length of the front pipe, austenization, cutting the front pipe into two pipes of equal length, machining - boring and turning of hot-rolled conversion pipes of size 550 × 30 × 5150-5350 mm into commodity pipes measuring 530 × 8-12 × 5150-5350 mm.
2. The method according to p. 1, characterized in that the machining of the hot rolled pipes of size 550 × 30 × 5150-5350 mm into commodity machined pipes is first carried out at a size of 530 × 12 mm, then at a size of 530 × 11, 530 × 10 , 530 × 9 and 530 × 8 mm.
RU2016110206A 2016-03-22 2016-03-22 METHOD OF PRODUCING SEAMLESS MACHINED PIPES WITH 530x8-12 mm SIZE FROM THE STEEL GRADE 08X18H10T RU2615921C1 (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
RU2322315C2 (en) * 2006-05-22 2008-04-20 ОАО "Челябинский трубопрокатный завод" Method for producing in tube rolling plants with pilger mills seamless hot-deformed elongated tubes for steam boilers, steam conduits and manifolds of plants with high and super-critical parameters of steam
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

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
RU2322315C2 (en) * 2006-05-22 2008-04-20 ОАО "Челябинский трубопрокатный завод" Method for producing in tube rolling plants with pilger mills seamless hot-deformed elongated tubes for steam boilers, steam conduits and manifolds of plants with high and super-critical parameters of steam
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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