RU2537682C2 - PRODUCTION OF 377×14-60 mm SEAMLESS HOT-ROLLED PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERHIGH STEAM PARAMETERS FROM ESR INGOTS OF "10Х9МФБ-Ш"-GRADE STEEL - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy. Proposed method comprises ESR smelting of ingots, their turning to ingots-billets sized to 490×1750±50 mm and 565×1750±50 mm and boring 100±5 mm diameter holes therein. Said billets are heated to ductility temperature and pierced at helical rolling mill to het the sleeve billets. Said billets are cooled, repaired is required and reheated from cold state to ductility temperature. Sleeve billets are pierced-rolled at helical rolling mill and rolled at Pilger mills and rolled to commercial pipes. Then, they are subjected to ultrasound control and acceptance with diameter and wall depth allowances of +1.25/-1.0% and +20/-5.0%, respectively. Pipes sized to 377×14-19 mm are produced at CPR 450 mill from hot rerolled pipes sized to 426×21 mm and 426×23 mm. Commercial 377x20-30 mm pipes are produced at PRU 8-16'' with Pilger mills from hollow ESR ingots-billets sized to 540× ID360×3200±50 mm and 540×ID340×3200±50 mm. Commercial 377×31-40 mm pipes are produced from hollow ESR ingots-billets sized to 540× ID0.200×2100±50 mm. Commercial 377×41-60 mm pipes are made from EST ingots sized to 565×100×1750 mm.

EFFECT: mechanical properties and geometry complying with standing specifications, lower metal input and higher PRU efficiency.

7 cl, 1 tbl

Description

The invention relates to pipe rolling production, and in particular to a method for the production of seamless pipes with a size of 377 × 14-60 mm for steam boilers, steam pipelines and manifolds of installations with high and supercritical parameters of steam made of 10Kh9MFB-Sh steel and can be used on a pipe rolling installation 8-16 ”With pilgrim mills in the production of commodity pipes 377 × 20-40 mm in size from hollow ingots-billets of electroslag remelting (ESR), commodity pipes 377 × 41-60 mm in diameter from ingot-billets of electroslag remelting and conversion tubes of 426 × 21 and 426 × 23 mm and from hollow ingots-blanks for their subsequent rolling on the KhPT 450 mill into commodity pipes 377 × 14-19 mm in size.

In the practice of pipe production, there is a method of manufacturing boiler pipes of large and medium diameters from forged billets of steels of grades 20, 15GS, 15XM, 12X1MF, 15X1M1F, 12X2MFSR, 10X9MFB, 12X11V2MF, 08X16H9M2, 12X18N12T, 10Kh13G12B2K2 with mechanical properties that include forging them into forgings (compaction of the structure) with a yoke of ≥2.5, machining the forgings into billets (turning with metal removal of 10-15 mm per side), drilling in the blanks of a central hole with a diameter of 100 ± 5 mm to remove the central quasi-porosity and non-metallic inclusions, heating the workpieces to ductility temperature, piercing the workpieces in cross-screw rolling mills into sleeves, rolling the sleeves into pipes with a diameter of 245-550 mm on an 8-16 ”pilgrim installation with a diameter tolerance of + 1.25 / -1 , 0% and wall thickness + 25 / -5% (TU 14-1-2560-78 “Forged pipe blanks for boiler pipes”, TU 14-3-460-2003 and TU 14-3R-55-2001 “Steel pipes seamless for steam boilers and pipelines ”and TU 14-3-420-75“ Pipes for steam boilers and pipelines made of steel 15GS and 15Kh1M1F ”).

The disadvantage of this method is the high energy intensity of the process associated with heating and deformation (forging) of the ingots into forgings, followed by turning and drilling of the central hole, heating the workpieces to a plasticity temperature, piercing and rolling them into pipes on pilgrim mills with a wall tolerance of + 20 / - 5%, increased consumption coefficient of the metal during the redistribution of the ingot - forging - billet - pipe and, as a result, the high cost of pipes, and also that this steel grade, although included in TU14-3R-55-2001, but pipes to the last moment nt were not made from it.

In pipe production, there is a known method for manufacturing large diameter gas lift pipes from 09G2S steel ingots for the production of ESR and VDP (Patent RU No. 2119395, class V21V 19/04), where the ingots are deformed in the piercing mill along the crystals, setting the ingots in the mill with the head part, and stitch with a posad in diameter by the amount of:

D = 2S _G (1-sinα) / S _C ,

where S _G - wall thickness of the sleeve, mm;

S _C - wall thickness of the drilled ingot ESR, mm;

α is the angle of inclination of the crystallization front to the axis of the ingot, deg.

The disadvantage of this method of manufacturing large diameter pipes from ingots of ESR and VDP steel grade 09G2S is the need to manufacture macro templates to determine the angle of inclination of the crystallization front to the axis of the ingot, and the piercing of the ingots with shrink (head) part forward leads to the formation of defects in the form of internal captures at the front ends of the sleeves .

In pipe production, there is also known a method for the production of large diameter boiler pipes from ESR ingots (Patent RU No. 2180874, class B21B 19/04), which reduces energy costs, reduces metal consumption and, as a result, reduces the cost of boiler pipes through the use of large diameter ingots and conducting the firmware process with a posad in diameter equal to 8-16%.

The disadvantages of this method are that, due to the low power of the drive of the piercing mill of the ChTPZ OJSC, ESR ingots from this brand began to be stitched with a pitch of 8-16% in diameter, it is not possible.

In pipe production, there is also known a method for the production of hot-rolled conversion and commodity pipes of large and medium diameters from hard-to-deform grades of steel and alloys in pipe rolling plants with pilgrim mills (Patent RU No. 2278750, class B21B 21/00), including turning of ESR ingots and forged billets, drilling a central hole with a diameter of 100 ± 5 mm, heating them to a temperature of plasticity, piercing with subsequent rolling in a cross-helical mill into sleeves and rolling the sleeves in a pilgrim mill into hot-rolled front pipes or pipes with a relatively thick wall, with the first piercing of ESR ingots and forged billets in a cross-helical rolling mill with the bottom end forward, and the second piercing-rolling with the shrink end forward, the pipes are rolled on a pilgrim mill with diameter to the wall thickness D / S = 6.5-8.0 with a hood µ≤4.5.

The disadvantage of this method is that it includes heating the ESR ingots and billets to a temperature of ductility, flashing them in a cross-helical rolling mill into billet sleeves, reheating the billet blanks from a cold or hot embankment to a ductility temperature, flashing-rolling in the mill cross-helical rolling into sleeves with their subsequent rolling in a pilgrim mill to commodity or conversion pipes. Double heating leads to double burning of the metal, and the flashing of ESR ingots and billets into blanks, followed by rolling them into sleeves leads to a 2-fold loss in the performance of the pilgrim installation, and, consequently, to an increase in the cost of commodity and conversion pipes. This method extends to the production of seamless hot-deformed conversion and commodity pipes of large and medium diameters in tube-rolling plants with pilgrim mills from hard-deformed grades of steel and alloys and does not provide for the production of boiler tubes from solid and hollow ingots-blanks EShP steel grade 10X9MFB-Sh.

The closest technical solution is a method for the production of seamless hot-deformed pipes of large and medium diameters in tube rolling plants with pilgrim mills for steam boilers, steam pipelines and manifolds of plants with high and supercritical parameters of steam from electroslag remelting ingots and continuously cast billets (Patent RU No. 2322314, cl . В21В 19/04), which provides for the piercing of ESR and NLZ ingots in cross-helical rolling mills with a diameter pitch depending on the grade of steel and the total output yields during redistribution of an electroslag remelting ingot - a pipe or a continuously cast billet - a pipe, while the values of pellet sizes by the diameter of electroslag remelting ingots when piercing in cross-helical rolling mills are determined from the expression:

Δ _i′ashp = k _i′eshp µ _i Σ,

where Δ _i′eshp are the values of the sizes according to diameter when piercing in the helical rolling mills of ESR ingots of i-steel grade,%;

µ _i Σ = µ _ave. µ _p - the total drawing coefficient when rolling pipes of the i-th size;

k _i'eshp - coefficient taking into account the size of the gang in diameter when flashing sleeves from ESR ingots of i-steel grade,%;

µ _pr. - the coefficient of drawing when flashing sleeves for rolling pipes of the i-th size;

µ _p. is the drawing coefficient when rolling j-sized pipes on a pilgrim mill, while the coefficients k _i′shp for different grades vary from 24 to 40.

The disadvantage of this method is that it is very difficult to manufacture, because each pipe size requires its own ESR ingots, this method extends to the production of seamless hot-deformed pipes of large and medium diameters in tube rolling plants with pilgrim mills made of carbon steel grades and does not provide production of boiler tubes from EShP ingots of steel grade 10X9MFB-Sh. Currently, Russian factories, namely ZMZ OJSC and Mechel OJSC, have mastered the production of ESR ingots of 430 × 1750 ± 50, 470 × 1750 ± 50, 490 × 1750 ± 50, 565 × 1750 ± 50, 620 × 1750 ± 50 mm and hollow ingots of ESR with dimensions 600 × ext. 400 × 3200 ± 50, 540 × ext. 360 × 3200 ± 50, 540 × ext. 340 × 3200 ± 50 and 540 × ext. 200 × 2100 ± 50 mm. For the production of other diameters, molds are needed, the production of which requires large investments, and there is no reason to, because the geometric dimensions of ingot blanks and hollow ingot blanks can be unified.

Pipes with a diameter of 377 mm in Russia can only be produced at 8-16 ”TPU with pilgrim mills and at the KhPT 450 mill.

Rolling pipes of 377 × 14-19 mm in size on TPU 8-16 ”with pilgrim mills is problematic due to the low temperature of 10Kh9MFB-Sh steel under a deformation of 1180-1200 ° C. For rolling pipes with a size of 377 × 14-19 mm, ingots-blanks of ESR with a size of 565 × 100 × 1750 mm are required, of which a 377 × 14 mm pipe with a length of up to 26 meters is obtained on a pilgrim mill. The rolling time of such a pipe is more than 4.0 minutes. During this period of time, the sleeve tube cools down to 800 ° C (at a recommended minimum of 850 ° C at the end of rolling). Rolling pipes and rolling in pilgrim heads made of 10Kh9MFB-Sh steel at temperatures below 850 ° C leads to increased loads on the pilgrim mill drive and tightening the mandrels, which, in turn, can lead to breakdown of the safety bolts and spindles of the pilgrim mill, lowering performance by removing mandrels due to puffs, replacing safety bolts and spindles. To reduce the number of puffs, it was necessary to roll pipes from this brand on mandrels with a taper of 4-5 mm, instead of a taper of 1.0 mm, which would lead to longitudinal delta and increased rejection of pipes along the wall.

The objective of the proposed method (invention) is the exclusion from the process of double flashing of ingots-blanks of ESR in the cross-helical rolling mill - flashing of ingots-blanks into blanks-blanks and their subsequent flashing - rolling into sleeves, double heating - heating of ingots-blanks to temperature ductility and heating of sleeve blanks to ductility temperature, increasing the productivity of TPU 8-16 ”with pilgrim mills and mastering the production of seamless pipes 377 × 14-60 mm in size for steam boilers, steam line c and collectors of installations with high and supercritical parameters of steam from hollow ingots-blanks of electroslag remelting of size 600 × ext. 400 × 3200 ± 50, 540 × ext. 360 × 3200 ± 50, 540 × ext. 340 × 3200 ± 50, 540 × vn 200 × 2100 ± 50 and ESR ingots-billets of 565 × 100 × 1750 ± 50 mm in size made of 10Kh9MFB-Sh steel instead of forged billets, namely the production of commodity pipes 377 × 20-60 mm in size and 426 × 21 conversion tubes and 426 × 23 mm on 8-16 ”TPU with pilgrim mills and the subsequent redistribution (rolling) of the conversion pipes at the KhPT 450 mill into commodity pipes 377 × 14-19 mm in size with increased requirements mechanical properties, geometric dimensions and surface quality, reduction of metal consumption during redistribution, hollow ingot-billet and ingot-billet ESR - boiler pipe and increase the mechanical properties of pipe metal due to the fractional deformation during rolling at TPU with pilgrim mills and rolling (rolling ) redistribution pipes at the HPT mills.

до $${\mu }_{\sum }^1=7,30$$

, меньшие значения которых относятся к трубам с меньшими отношениями D/S и определяются из выражений: µ_Σ=µ_пр.µ_п, $${\mu }_{\sum }^1={\mu }_{\sum }{\mu }_x$$

где µ_пр. - вытяжка при прошивке слитков и прошивке-раскатке полых слитков-заготовок в гильзы в стане поперечно-винтовой прокатки; µ_п. - вытяжка при прокатке передельных и товарных труб на пилигримовом стане; µ_x - вытяжка при перекатке передельных труб в товарные на стане ХПТ 450, прокатку товарных труб на ТПУ с пилигримовыми станами производят из полых слитков-заготовок с коэффициентом вытяжки µ≥3,5, а значения толщин стенок полых слитков при отливке определяют из выражения: $$S_{з(1,2)}=\frac{k{D}_{з}\pm \sqrt{{(k{D}_{з})}^2-4k\mu S_m{(D_m-S_m)}^2}}{2k}+{\Delta }_o+{\Delta }_p$$

, где k=0,97-0,98 - коэффициент, учитывающий величину угара при нагреве металла в методической печи, большие значения которого принимаются при нагреве металла из легированных марок стали; D_з - наружный диаметр полого слитка-заготовки, мм; D_m - диаметр горячекатаной товарной трубы, мм; S_m - толщина стенки горячекатаной товарной трубы, мм; µ≥3,5 - коэффициент вытяжки при прокатке товарных горячекатаных труб на пилигримовом стане из полых слитков-заготовок; Δ_o- припуск на обточку полых слитков в полые слитки-заготовки, мм; Δ_р - припуск на расточку полых слитков в полые слитки-заготовки, мм, после выдачи из печи перед транспортировкой на пилигримовый стан в полые слитки-заготовки размером 600×вн.400×3200×±50, 540×вн.360×3200±50 и 540×вн.340×3200±50 мм подают смазку в виде смеси графита с поваренной солью (50/50) массой 500-800 г, а в слитки размером 565×100×1750 мм и слитки-заготовки размером 540×вн.200×2100±50 мм смазку массой 300-500 и 400-600 г подают в центральное отверстие перед прошивкой и прошивкой-раскаткой.The technical result is achieved by the fact that in the known method for the production of seamless pipes 377 × 14-60 mm in size for steam boilers, steam pipelines and manifolds of plants with high and supercritical steam parameters from 10Kh9MFB-Sh steel, including ingots melting by electroslag remelting, machining is turned ingots into ingot blanks of sizes 490 × 1750 ± 50 and 565 × 1750 ± 50 mm, drilling in ingot blanks of a central hole with a diameter of 100 ± 5 mm, heating ingot blanks to plasticity temperature, piercing them crosswise o-helical rolling into billet sleeves, cooling of billet blanks, repair of billet blanks if necessary, re-heating of the billet blanks from a cold embankment to the ductility temperature, flashing-rolling of the billet blanks in a cross-helical rolling mill into the sleeves, rolling of the sleeves on pilgrim mills into commodity pipes of size 377 × 20-60 mm and conversion tubes of 392 × 30 and 392 × 33 mm, heat treatment, machining - turning and boring of conversion tubes of 392 × 30 mm into commodity pipes of 37 × 14-16 mm, and the conversion pipe size rum 392 × 33 mm - for goods with a size of 377 × 17-19 mm, ultrasonic inspection, acceptance of pipes with a tolerance of diameter + 1.25 / -1.0% and wall thickness + 20 / -5.0%, pipes with a size of 377 × 14-19 mm are produced at the KhPT mill 450 from hot-rolled chimneys of 426 × 21 and 426 × 23 mm in size, commodity pipes of 377 × 20-30 mm in size are produced at 8-16 ”TPU with pilgrim mills from hollow ingots-billets of electroslag remelting 540 × in. 360 × 3200 ± 50 and 540 × in. 340 × 3200 ± 50 mm in size, commodity pipes 377 × 31-40 mm in size - from hollow ingot blanks of 540 × in. 200 × 2100 ± 50 mm in size, and pipes 377 × 41-60 mm in size - from ESR ingots 565 × 100 × 1750 mm in size, conversion pipes of 426 × 21 and 426 × 23 mm in size are made from hollow ingots of electroslag remelting, which are grinded and bored into hollow ingots of 600 × vn. 400 × 3200 ± 50 mm in size, ingots-blanks heated to a temperature of 1180-1200 ° C and rolled on a 8-16 ”TPU with pilgrim mills into conversion tubes of 426 × 21 × 151000-15700 and 426 × 23 × 13600-14200 mm in size with hoods µ = 5.76 and µ = respectively 5.29, with a compression in diameter of 28.3% and with feeds of sleeves into the deformation zone m = 15-18 mm, a piece of technological waste is made - seed ends and pilgrim heads with a hot cutting saw, straightening on a six-roll straightening machine, heat treatment, repair, if necessary, cut into two equal length pipes and taken with a tolerance of + 1.25 / -1.0% in diameter and ± 12.5 in wall thickness %, conversion pipes of 426 × 21 × 7550-7850 mm in size are rolled on the KhPT 450 mill into commodity cold-rolled pipes of 377 × 14 × 12300-12800, 377 × 15 × 11600-12000 and 377 × 16 × 10800-11200 mm sizes with hoods, respectively µ = 1.67, µ = 1.57 and µ = 1.47, and the conversion pipes of 426 × 23 × 6800-7100 mm in size are rolled at the KhPT 450 mill into commodity pipes of 377 × 17 × 10000-10500, 377 × 18 × 9400-9800 and 377 × 19 × 8900-8300 mm with hoods µ = 1.52, µ = 1.43 and µ = 1.38; heat treatment, dressing, ultrasonic inspection and acceptance of pipes with tolerances of diameter ± 1.0% and thickness + 15 / -5% wall, pipes with a diameter of 377 mm and wall thicknesses from 20 to 30 mm are made from hollow ingots of electroslag remelting, which are grinded and bored into hollow ingots-blanks of sizes 540 × vn. 360 × 3200 ± 50 and 540 × vn .340 × 3200 ± 50 mm, heated to a temperature of 1190-1200 ° C and rolled at 8-16 ”TPU with pilgrim mills into commodity pipes 377 × 20 × 14600-14700 - 377 × 30 × 10300-9300 with hoods from µ = 5.43 to µ = 3.91 with a diameter of 29.6% and with feeds of sleeves into the deformation zone m = 17-19 mm, pipes with a diameter of 377 mm and wall thicknesses from 31 to 40 mm are produced from hollow ingots of electroslag remelting, which are turned and bored into hollow ingots of size 540 × in. 200 × 2100 ± 50 mm, heated to a temperature of 1180-1190 ° C, stitched-rolled in a cross-helical rolling mill without diameter rise into sleeves measuring 540 × in. 340 × 2840-3010 and 540 × in. 315 × 2620-2750 mm on mandrels with a diameter of 325 and 300 mm with hoods µ = 1.4 and µ = 1.28, which are rolled at 8-16 ”TPU with pilgrim mills into commercial t 377 × 31 × 9100-9700 - 377 × 40 × 7700-8200 shafts with hoods from µ = 3.88 to µ = 3.35, compression by diameter of 29.6% and with feeds of sleeves into the deformation zone m = 21- 24 mm, and pipes with a diameter of 377 mm with wall thicknesses from 41 to 60 mm are rolled from ESR ingots-blanks measuring 565 × 100 × 1750 ± 50 mm, which are heated to a temperature of 1200-1220 ° C, stitched in a cross-helical rolling mill in sleeves of size 550 × in. 315 × 2530-2680 and 550 × in. 290 × 2360-2500 on mandrels with a diameter of 300 and 275 mm with hoods µ = 1.49 and µ = 1.39 and a diameter fit Δ = 2.65 %, the sleeves are rolled at 8-16 ”TPU with pilgrim mills into commodity pipes 377 × 41 × 8000-8500 - 377 × 60 × 5400-5800 mm with hoods from µ = 3.55 to µ = 2.71, compression by diameter of 30.9% and with feeds of sleeves into the deformation zone m = 23-26 mm, they produce a piece of technological waste - seed ends and pilgrim heads with a hot cutting saw, straightening on a six-roll straightening machine, heat treatment, etching, repair, ultrasonic inspection and acceptance of pipes with a tolerance of + 1.25 / -1.0% in diameter and wall thickness + 20 / -5.0%, hot-rolled chimneys at 8-16 ”TPU with pilgrim mills are produced with hoods µ = 5.76 and µ = 5.29, and hot-rolled commodity-sized 377 × 20-30 mm with hoods from μ = 5.43 to μ = 3.91, hot-rolled commodity pipes 377 × 31-40 mm in size with total hoods from _Σ = 5.43 to _Σ 4.29, commodity pipes 377 × 41-60 mm with total hoods from μ _Σ = 5.29 to μ _Σ = 3.76, and commodity cold-rolled pipes 377 × 14-19 mm in size are produced with total hoods $${\mu }_{\sum }^{\mathrm{one}}=9,62$$

before $${\mu }_{\sum }^{\mathrm{one}}=7,\mathrm{thirty}$$

, the smaller values of which relate to pipes with lower D / S ratios and are determined from the expressions: μ _Σ = μ _ave μ _p , $${\mu }_{\sum }^{\mathrm{one}}={\mu }_{\sum }{\mu }_x$$

where µ _ave. - hood when flashing the ingots and flashing-rolling the hollow ingots-blanks into sleeves in a cross-helical rolling mill; µ _p. - hood during rolling of conversion and commodity pipes on a pilgrim mill; µ _x - hood when rolling the conversion pipes into commodity ones at the KhPT 450 mill, rolling of commodity pipes at TPU with pilgrim mills is carried out from hollow ingots with a drawing coefficient µ≥3.5, and the wall thicknesses of hollow ingots during casting are determined from the expression: $$S_{s(\mathrm{one},2)}=\frac{k{D}_s\pm \sqrt{{(k{D}_s)}^2-\mathrm{four}k\mu S_m{(D_m-S_m)}^2}}{2k}+{\Delta }_o+{\Delta }_p$$

where k = 0.97-0.98 is a coefficient that takes into account the value of fumes when heating the metal in a methodical furnace, large values of which are taken when heating metal from alloyed steel grades; D _s - the outer diameter of the hollow ingot billet, mm; D _m - the diameter of the hot-rolled commodity pipe, mm; S _m - wall thickness of the hot-rolled commodity pipe, mm; µ≥3.5 is the drawing coefficient when rolling commodity hot-rolled pipes on a pilgrim mill from hollow ingots-billets; Δ _o - allowance for turning hollow ingots into hollow ingots-blanks, mm; Δ _p is the allowance for hollow ingots into hollow ingots-blanks, mm, after dispensing from the furnace before transportation to the pilgrim mill in hollow ingots-blanks with dimensions of 600 × in. 400 × 3200 × ± 50, 540 × in. 360 × 3200 ± 50 and 540 × vn. 340 × 3200 ± 50 mm serves lubricant in the form of a mixture of graphite with sodium chloride (50/50) weighing 500-800 g, and in ingots of 565 × 100 × 1750 mm in size and ingots of 540 × vn .200 × 2100 ± 50 mm grease weighing 300-500 and 400-600 g is fed into the central hole before flashing and rolling-rolling firmware.

до $${\mu }_{\sum }^1=7,30$$

, меньшие значения которых относятся к трубам с меньшими отношениями D/S и определяются из выражений: µ_Σ=µ_пр.µ_п, $${\mu }_{\sum }^1={\mu }_{\sum }{\mu }_x$$

где µ_пр. - вытяжка при прошивке слитков и прошивке-раскатке полых слитков-заготовок в гильзы в стане поперечно-винтовой прокатки; µ_п - вытяжка при прокатке передельных и товарных труб на пилигримовом стане; µ_х - вытяжка при перекатке передельных труб в товарные на стане ХПТ 450, прокатку товарных труб на ТПУ с пилигримовыми станами производят из полых слитков-заготовок с коэффициентом вытяжки µ≥3,5, а значения толщин стенок полых слитков при отливке определяют из выражения: $$S_{з(1,2)}=\frac{k{D}_{з}\pm \sqrt{{(k{D}_{з})}^2-4k\mu S_m{(D_m-S_m)}^2}}{2k}+{\Delta }_o+{\Delta }_p$$

, где k=0,97-0,98 - коэффициент, учитывающий величину угара при нагреве металла в методической печи, большие значения которого принимаются при нагреве металла из легированных марок стали; D_з - наружный диаметр полого слитка-заготовки, мм; D_m - диаметр горячекатаной товарной трубы, мм; S_m - толщина стенки горячекатаной товарной трубы, мм; µ≥3,5 - коэффициент вытяжки при прокатке товарных горячекатаных труб на пилигримовом стане из полых слитков-заготовок; Δ_o - припуск на обточку полых слитков в полые слитки-заготовки, мм; Δ_р - припуск на расточку полых слитков в полые слитки-заготовки, мм, после выдачи из печи перед транспортировкой на пилигримовый стан в полые слитки-заготовки размером 600×вн.400×3200×±50, 540×вн.360×3200±50 и 540×вн.340×3200±50 мм подают смазку в виде смеси графита с поваренной солью (50/50) массой 500-800 г, а в слитки размером 565×100×1750 мм и слитки-заготовки размером 540×вн.200×2100±50 мм смазку массой 300-500 и 400-600 г подают в центральное отверстие перед прошивкой и прошивкой-раскаткой. Таким образом, эти отличия позволяют сделать вывод о соответствии критерию “изобретательский уровень”.Comparative analysis with the prototype shows that the inventive method for the production of seamless pipes with a size of 377 × 14-60 mm for steam boilers, steam pipelines and manifolds of installations with high and supercritical parameters of steam from steel grade 10X9MFB-Sh is different in that the pipes are 377 × 14-19 mm are produced at the KhPT 450 mill from hot-rolled chimneys of 426 × 21 and 426 × 23 mm in size, commodity pipes of 377 × 20-30 mm are produced at 8-16 ”TPU with pilgrim mills from hollow ingots-billets of electroslag remelting of 540 × vn .360 × 3200 ± 50 and 540 × ext. 340 × 3 200 ± 50, commodity pipes 377 × 31-40 mm in size from hollow ingots-blanks of 540 × ext 200 × 2100 ± 50 mm in size, and 377 × 41-60 mm pipes from ESR ingots of 565 × 100 × 1750 mm, Conversion pipes 426 × 21 and 426 × 23 mm in size are made from hollow ingots of electroslag remelting, which are grinded and bored into hollow ingots-blanks of size 600 × in. 400 × 3200 ± 50 mm, ingots-blanks are heated to a temperature of 1180-1200 ° C and rolled at 8-16 ”TPU with pilgrim mills into redox pipes of size 426 × 21 × 151000-15700 and 426 × 23 × 13600-14200 mm with hoods, respectively, µ = 5.76 and µ = 5.29, compression according to 28.3% of the meter and with feeds of sleeves into the deformation zone m = 15-18 mm, a piece of technological waste is made - seed ends and pilgrim heads with a hot cutting saw, straightening on a six-roll straightening machine, heat treatment, repair, if necessary, cut into two pipes crates of equal length and are accepted with a tolerance of + 1.25 / -1.0% in diameter and ± 12.5% of wall thickness, conversion pipes of 426 × 21 × 7550-7850 mm in size are rolled at the KhPT 450 mill into commercial cold-rolled pipes of size 377 × 14 × 12300-12800, 377 × 15 × 11600-12000 and 377 × 16 × 10800-11200 mm with hoods, respectively, µ = 1.67, µ = 1.57 and µ = 1.47, and the conversion pipes of 426 × 23 × 6800-7100 mm in size are rolled at the KhPT 450 mill into commodity pipes of 377 × 17 × 10000-10500, 377 × 18 × 9400-9800 and 377 × 19 × 8900-8300 mm with hoods µ = 1.52, µ = 1.43 and µ = 1.38; heat treatment, dressing, ultrasonic inspection and acceptance of pipes with tolerances of diameter ± 1.0% and wall thickness + 15 / -5%, pipes with a diameter of 377 mm with wall thicknesses of 20 to 30 mm are made from hollow ingots of electroslag remelting, which are grinded and bored into hollow ingots-blanks of 540 × vn. 360 × 3200 ± 50 and 540 × vn. 340 × 3200 ± 50 mm, heated to a temperature of 1190-1200 ° C and rolled at 8-16 ”TPU with pilgrim mills into commodity pipes 377 × 20 × 14600-14700 - 377 × 30 × 10300-9300 with hoods from µ = 5.43 to µ = 3.91, compression in diameter 29, 6% and with feeds of sleeves into the deformation zone m = 17-19 mm, pipes with a diameter of 377 mm and wall thicknesses from 31 to 40 mm are made from hollow ingots of electroslag remelting, which are turned and bored into hollow ingots-blanks of size 540 × inner 200 × 2100 ± 50 mm, heated to a temperature of 1180-1190 ° C, stitched-rolled in a cross-helical rolling mill without lifting in diameter into sleeves measuring 540 × in. 340 × 2840-3010 and 540 × in. 31 5 × 2620-2750 mm on mandrels with a diameter of 325 and 300 mm with hoods µ = 1.4 and µ = 1.28, which are rolled on TPU 8-16 ”with pilgrim mills into commodity pipes 377 × 31 × 9100-9700 - 377 × 40 × 7700-8200 with hoods from µ = 3.88 to µ = 3.35, compression by diameter of 29.6% and with feeds of sleeves into the deformation zone m = 21-24 mm, and pipes with a diameter of 377 mm with thicknesses walls from 41 to 60 mm are rolled from ESR ingots-blanks with a size of 565 × 100 × 1750 ± 50 mm, which are heated to a temperature of 1200-1220 ° C, stitched in a cross-screw mill in sleeves of size 550 × ext. 315 × 2530- 2680 and 550 × ext. 290 × 2360-2500 on mandrels with a diameter of 300 and 275 mm with with filaments µ = 1.49 and µ = 1.39 and a diameter of Δ = 2.65%, sleeves are rolled on 8-16 ”TPU with pilgrim mills into commodity pipes 377 × 41 × 8000-8500 - 377 × 60 × 5400-5800 mm with hoods from µ = 3.55 to µ = 2.71, compression in diameter of 30.9% and with feeds of sleeves into the deformation zone m = 23-26 mm, produce a piece of technological waste - seed ends and pilgrim heads hot cutting saw, straightening on a six-roll straightening machine, heat treatment, etching, repair, ultrasonic inspection and acceptance of pipes with a tolerance of + 1.25 / -1.0% in diameter and + 20 / -5.0% in wall thickness, redistribution hot rolled pipes at 8-16 ”TPU with pilgrim mills are produced with hoods µ = 5.76 and µ = 5.29, and hot-rolled commodity tubes 377 × 20-30 mm in size with hoods from µ = 5.43 to µ = 3, 91, hot-rolled commodity pipes 377 × 31-40 mm in size with total hoods from μ _Σ = 5.43 to μ _Σ = 4.29, 377 × 41-60 mm commodity pipes with total hoods from μ _Σ = 5.29 to µ _Σ = 3.76, and commodity cold-rolled pipes 377 × 14-19 mm in size are produced with total hoods $${\mu }_{\sum }^{\mathrm{one}}=9,62$$

before $${\mu }_{\sum }^{\mathrm{one}}=7,\mathrm{thirty}$$

, the smaller values of which relate to pipes with lower D / S ratios and are determined from the expressions: μ _Σ = μ _ave μ _p , $${\mu }_{\sum }^{\mathrm{one}}={\mu }_{\sum }{\mu }_x$$

where µ _ave. - hood when flashing the ingots and flashing-rolling the hollow ingots-blanks into sleeves in a cross-helical rolling mill; µ _p - hood during rolling of conversion and commodity pipes on a pilgrim mill; µ _x - hood when rolling the conversion pipes into commodity ones at the KhPT 450 mill, rolling of commodity pipes at TPU with pilgrim mills is performed from hollow ingots-blanks with a drawing coefficient µ≥3.5, and the wall thicknesses of hollow ingots during casting are determined from the expression: $$S_{s(\mathrm{one},2)}=\frac{k{D}_s\pm \sqrt{{(k{D}_s)}^2-\mathrm{four}k\mu S_m{(D_m-S_m)}^2}}{2k}+{\Delta }_o+{\Delta }_p$$

where k = 0.97-0.98 is a coefficient that takes into account the value of fumes when heating the metal in a methodical furnace, large values of which are taken when heating metal from alloyed steel grades; D _s - the outer diameter of the hollow ingot billet, mm; D _m - the diameter of the hot-rolled commodity pipe, mm; S _m - wall thickness of the hot-rolled commodity pipe, mm; µ≥3.5 is the drawing coefficient when rolling commodity hot-rolled pipes on a pilgrim mill from hollow ingots-billets; Δ _o - allowance for turning hollow ingots into hollow ingots-blanks, mm; Δ _p is the allowance for hollow ingots into hollow ingots-blanks, mm, after dispensing from the furnace before transportation to the pilgrim mill in hollow ingots-blanks with dimensions of 600 × in. 400 × 3200 × ± 50, 540 × in. 360 × 3200 ± 50 and 540 × vn. 340 × 3200 ± 50 mm serves lubricant in the form of a mixture of graphite with sodium chloride (50/50) weighing 500-800 g, and in ingots of 565 × 100 × 1750 mm in size and ingots of 540 × vn .200 × 2100 ± 50 mm grease weighing 300-500 and 400-600 g is fed into the central hole before flashing and rolling-rolling firmware. 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 the art did not allow them to identify signs that distinguish the claimed method from the prototype, which corresponds to the patentability “inventive step”.

до $${\mu }_{\sum }^1=7,30$$

, меньшие значения которых относятся к трубам с меньшими отношениями D/S и определяются из выражений: µ_Σ=µ_пр.µ_п, $${\mu }_{\sum }^1={\mu }_{\sum }{\mu }_x$$

, где µ_пр. - вытяжка при прошивке слитков и прошивке - раскатке полых слитков-заготовок в гильзы в стане поперечно-винтовой прокатки; µ_п - вытяжка при прокатке передельных и товарных труб на пилигримовом стане; µ_х - вытяжка при перекатке передельных труб в товарные на стане ХПТ 450, прокатку товарных труб на ТПУ с пилигримовыми станами производят из полых слитков-заготовок с коэффициентом вытяжки µ≥3,5, а значения толщин стенок полых слитков при отливке определяют из выражения: $$S_{з(1,2)}=\frac{k{D}_{з}\pm \sqrt{{(k{D}_{з})}^2-4k\mu S_m{(D_m-S_m)}^2}}{2k}+{\Delta }_o+{\Delta }_p$$

, где k=0,97-0,98 - коэффициент, учитывающий величину угара при нагреве металла в методической печи, большие значения которого принимаются при нагреве металла из легированных марок стали; D_з - наружный диаметр полого слитка-заготовки, мм; D_m - диаметр горячекатаной товарной трубы, мм; S_m - толщина стенки горячекатаной товарной трубы, мм; µ≥3,5 - коэффициент вытяжки при прокатке товарных горячекатаных труб на пилигримовом стане из полых слитков-заготовок; Δ_o - припуск на обточку полых слитков в полые слитки-заготовки, мм; Δ_р - припуск на расточку полых слитков в полые слитки-заготовки, мм, после выдачи из печи перед транспортировкой на пилигримовый стан в полые слитки-заготовки размером 600×вн.400×3200×±50, 540×вн.360×3200±50 и 540×вн.340×3200±50 мм подают смазку в виде смеси графита с поваренной солью (50/50) массой 500-800 г, а в слитки размером 565×100×1750 мм и слитки-заготовки размером 540×вн.200×2100±50 мм смазку массой 300-500 и 400-600 г подают в центральное отверстие перед прошивкой и прошивкой-раскаткой.The proposed method for the production of seamless pipes with a size of 377 × 14-60 mm for steam boilers, steam pipelines and manifolds of installations with high and supercritical steam parameters from steel grade 10X9MFB-Sh is that pipes with a size of 377 × 14-19 mm are produced at the HPT 450 mill from hot rolled pipes 426 × 21 and 426 × 23 mm in size, commodity pipes 377 × 20-30 mm in size are produced on 8-16 ”TPU with pilgrim mills from hollow ingots-blanks of electroslag remelting 540 × in. 360 × 3200 ± 50 and 540 × ext. 340 × 3200 ± 50, commodity pipes 377 × 31-40 mm in size from hollow blanks of 540 × ext. 200 × 2100 ± 50 mm in size, and pipes of 377 × 41-60 mm in size from ESR ingots of 565 × 100 × 1750 mm in size, conversion tubes in sizes of 426 × 21 and 426 × 23 mm are made from hollow ingots electroslag remelting, which is grinded and bored into hollow ingots-blanks of size 600 × ext. 400 × 3200 ± 50 mm, ingots-blanks are heated to a temperature of 1180-1200 ° C and rolled on 8-16 ”TPU with pilgrim mills into size pipes 426 × 21 × 151000-15700 and 426 × 23 × 13600-14200 mm with hoods, respectively, μ = 5.76 and μ = 5.29, compression in diameter of 28.3% and with feeds of sleeves into the deformation zone m = 15- 18 mm, they produce a piece of technological waste - seed ends and pilgrim heads with a hot cutting saw, dressing on a six-roll straightening machine, heat treatment, repair, if necessary, cut into two pipes of equal length and accept with a diameter tolerance of + 1.25 / - 1.0% and wall thickness ± 12.5%, conversion pipes of 426 × 21 × 7550-7850 mm in size are rolled at the KhPT 450 mill into commodity cold-rolled pipes of 377 × 14 × 12300-12800, 377 × 15 × 11600-12000 and 377 × 16 × 10800-11200 mm with hoods, respectively, µ = 1.67, µ = 1.57 and µ = 1.47, and the conversion pipe size 426 × 23 × 6800-71 00 mm are rolled on the KhPT 450 mill into commodity pipes 377 × 17 × 10000-10500, 377 × 18 × 9400-9800 and 377 × 19 × 8900-8300 mm with hoods µ = 1.52, µ = 1.43 and µ = 1.38, heat treatment, straightening, ultrasonic inspection and acceptance of pipes with tolerances of diameter ± 1.0% and wall thickness + 15 / -5% are carried out, pipes with a diameter of 377 mm with wall thicknesses from 20 to 30 mm are made from hollow electroslag remelting ingots, which are turned and bored into hollow ingots-blanks of 540 × vn. 360 × 3200 ± 50 and 540 × vn. 340 × 3200 ± 50 mm in size, are heated to a temperature of 1190-1200 ° C and rolled on TPU 8-16 ”With pilgrim camps into commodity pipes 377 × 20 × 14600-14700 - 377 × 30 × 10300-9300 with hoods from µ = 5.43 to µ = 3.91, compression by diameter of 29.6% and with feeds of sleeves into the deformation zone m = 17-19 mm, pipes with a diameter of 377 mm with wall thicknesses from 31 to 40 mm are made from hollow ingots of electroslag remelting, which are turned and bored into hollow ingots-blanks of 540 × vn. 200 × 2100 ± 50 mm in size, heated to a temperature of 1180- 1190 ° C, flashed-rolled out in a cross-rolling mill without diameter rise into sleeves measuring 540 × in. 340 × 2840-3010 and 540 × in. 315 × 2620-2750 mm on mandrels with a diameter of 325 and 300 mm with a hood ami µ = 1.4 and µ = 1.28, which are rolled at 8-16 ”TPU with pilgrim mills into commodity pipes 377 × 31 × 9100-9700 - 377 × 40 × 7700-8200 with hoods from µ = 3, 88 to μ = 3.35, compression by diameter of 29.6% and with feeds of sleeves into the deformation zone m = 21-24 mm, and pipes with a diameter of 377 mm with wall thicknesses from 41 to 60 mm are rolled from 565 ESR ingots × 100 × 1750 ± 50 mm, which are heated to a temperature of 1200-1220 ° C, is flashed in a cross-screw mill in sleeves of size 550 × in. 315 × 2530-2680 and 550 × in. 290 × 2360-2500 on mandrels with a diameter 300 and 275 mm with hoods µ = 1.49 and µ = 1.39 and a diameter of the fit Δ = 2.65%, g the blades are rolled at 8-16 ”TPU with pilgrim mills into commodity pipes 377 × 41 × 8000-8500 - 377 × 60 × 5400-5800 mm in size with hoods from µ = 3.55 to µ = 2.71, compression in diameter 30 , 9% and with feeds of sleeves into the deformation zone m = 23-26 mm, they cut off technological waste - seed ends and pilgrim heads with a hot cutting saw, dressing on a six-roll straightening machine, heat treatment, etching, repair, ultrasonic inspection and pipe acceptance with tolerance in diameter of + 1.25 / -1.0% and wall thickness + 20 / -5.0%, hot-rolled steel tubes at TPU 8-16 ”with pilgrim and with mills they produce with hoods µ = 5.76 and µ = 5.29, and hot-rolled commodity sizes 377 × 20-30 mm with hoods from µ = 5.43 to µ = 3.91, hot-rolled commodity pipes 377 × 31- 40 mm with total hoods from μ _Σ = 5.43 to μ _Σ = 4.29, commodity pipes measuring 377 × 41-60 mm with total hoods from μ _Σ = 5.29 to μ _Σ = 3.76, and commodity cold-rolled pipes 377 × 14-19 mm in size are produced with total hoods $${\mu }_{\sum }^{\mathrm{one}}=9,62$$

before $${\mu }_{\sum }^{\mathrm{one}}=7,\mathrm{thirty}$$

, the smaller values of which relate to pipes with lower D / S ratios and are determined from the expressions: μ _Σ = μ _ave μ _p , $${\mu }_{\sum }^{\mathrm{one}}={\mu }_{\sum }{\mu }_x$$

, where µ _ave. - hood when flashing ingots and flashing - rolling hollow ingots-blanks into sleeves in a cross-helical rolling mill; µ _p - hood during rolling of conversion and commodity pipes on a pilgrim mill; µ _x - hood when rolling the conversion pipes into commodity ones at the KhPT 450 mill, rolling of commodity pipes at TPU with pilgrim mills is performed from hollow ingots-blanks with a drawing coefficient µ≥3.5, and the wall thicknesses of hollow ingots during casting are determined from the expression: $$S_{s(\mathrm{one},2)}=\frac{k{D}_s\pm \sqrt{{(k{D}_s)}^2-\mathrm{four}k\mu S_m{(D_m-S_m)}^2}}{2k}+{\Delta }_o+{\Delta }_p$$

where k = 0.97-0.98 is a coefficient that takes into account the value of fumes when heating the metal in a methodical furnace, large values of which are taken when heating metal from alloyed steel grades; D _s - the outer diameter of the hollow ingot billet, mm; D _m - the diameter of the hot-rolled commodity pipe, mm; S _m - wall thickness of the hot-rolled commodity pipe, mm; µ≥3.5 is the drawing coefficient when rolling commodity hot-rolled pipes on a pilgrim mill from hollow ingots-billets; Δ _o - allowance for turning hollow ingots into hollow ingots-blanks, mm; Δ _p is the allowance for hollow ingots into hollow ingots-blanks, mm, after dispensing from the furnace before transportation to the pilgrim mill in hollow ingots-blanks with dimensions of 600 × in. 400 × 3200 × ± 50, 540 × in. 360 × 3200 ± 50 and 540 × vn. 340 × 3200 ± 50 mm serves lubricant in the form of a mixture of graphite with sodium chloride (50/50) weighing 500-800 g, and in ingots of 565 × 100 × 1750 mm in size and ingots of 540 × vn .200 × 2100 ± 50 mm grease weighing 300-500 and 400-600 g is fed into the central hole before flashing and rolling-rolling firmware.

Rolling commodity pipes 377 × 25, 377 × 35 and conversion 393 × 23, 426 × 23 mm in 10Kh9MFB-Sh steel was performed at 8-16 ”TPU with pilgrim mills from ESH ingots-blanks measuring 490 × 100 × 1750 ± 50 mm and 565 × 100 × 1750 ± 50 mm (existing technology) and hollow ingots-blanks of ESRs measuring 540 × in. 200 × 2100 ± 50, 540 × in. 3200 ± 50, 600 × in. 400 × 3200 ± 50 mm ( proposed technology). According to the existing method, rolling of the conversion pipes with a size of 393 × 23 mm is carried out from ESR ingots-blanks of a size of 565 × 100 × 1750 ± 50 mm according to the technology: ingots-blanks are heated in a methodical furnace to a plasticity temperature and stitched in a cross-helical rolling mill into workpieces with a size of 570 × ext. 290 × 2140-2270 mm on a mandrel with a diameter of 275 mm with a hood µ = 1.26 and a rise in diameter δ = 0.89; the billet sleeves from a cold embankment are heated in a methodical furnace to a plasticity temperature and stitched-rolled in a cross-screw mill into 580 × ext. 375 × 2590-2740 mm sleeves on a mandrel with a diameter of 360 mm with a hood µ = 1.21 and a lift diameter δ = 1.75; sleeves are rolled at 8-16 ”TPU with pilgrim mills into conversion tubes of 393 × 23 × 12400-13200 mm in size; Converting pipes are cut into two slots of equal length, turned and bored into commodity pipes measuring 377 × 18 × 6000-6400 mm. According to this technology, 5 ESR ingots-blanks with a total weight of 17.112 tons were set into production, of which ten pipes with a total weight of 10.510 tons were made in accordance with TU 14-3R-55-2001. The metal consumption coefficient for pipes of this batch was 1.628. According to the proposed method, rolling commodity pipes 377 × 18 mm in size was made according to the technology: hollow ingots-blanks with a size of 600 × ext. 400 × 3200 ± 50 mm were heated in a methodical furnace to a temperature of 1180-1200 ° C and rolled on 8-16 ”TPU by pilgrim mills to conversion pipes of 426 × 23 × 14100-14700 mm in size with an extract of μ = 5.29 and a compression in diameter of 28.3% and with feeds of sleeves into the deformation zone 16-17 mm; technological waste was cut off from the pipes by a hot cutting saw — seed ends and pilgrim heads; the pipes were straightened, heat treated, cut into two pipes of equal length and were taken with a tolerance of + 1.25 / -1.0% in diameter and ± 12.5% in wall thickness; conversion pipes 426 × 23 × 6850-7150 mm in size were rolled at the KhPT 450 mill into commodity pipes of 377 × 18 mm in size with an extractor µ = 1.43; commodity pipes were fixed, underwent heat treatment, ultrasonic testing and acceptance of pipes in diameter ± 1.0% and wall thickness + 15.0 / -5.0% (paragraphs 1-3 of the claims). Five hollow billets with a total weight of 19.658 tons were commissioned. Ten pipes 377 × 18 × 9200-9600 mm in size and a total weight of 15.995 tons were adopted in accordance with TU 14-3R-55-2001. The flow rate of the metal in the pipes of this lot was 1.229. When rolling commodity pipes with a size of 377 × 18 mm according to the proposed method, a reduction in the expenditure coefficient of the metal by 399 kg per ton of pipes was obtained, while at the same time doubling the productivity of TPU 8-16 ”. According to the existing method, commodity pipes 377 × 25 mm in size are produced from ESR ingots-billets of 490 × 100 × 1750 ± 50 mm in size according to the technology: ingot-billets are heated to a plasticity temperature and stitched in a cross-helical rolling mill into 510 × billet blanks ext. 290 × 2180-2300 mm on a mandrel with a diameter of 275 mm with a hood µ = 1.28 and a rise in diameter δ = 4.08%; the billet sleeves from a cold embankment are heated in a methodical furnace to a plasticity temperature; sleeves-blanks are stitched-rolled in a cross-helical rolling mill into sleeves of size 540 × ext. 365 × 2350-2500 mm on a mandrel with a diameter of 350 mm with a hood µ = 1,09 and a rise in diameter δ = 5.88; the sleeves are rolled at 8-16 ”TPU with pilgrim mills into commodity pipes measuring 377 × 25 × 7400-8000 mm. According to this technology, 5 ingot blanks with a total weight of 12.415 tons were commissioned. Five pipes 377 × 25 × 7400-8000 mm in size with a total weight of 9.015 tons were commissioned in accordance with TU 14-3R-55-2001. party totaled 1.377. According to the proposed method in accordance with paragraphs. 4 and 5 of the claims, 5 hollow ingots-blanks with a size of 540 × ext. 340 × 3200 ± 50 mm with a total weight of 17,406 tons were set into production. Hollow ingots-blanks were heated in a method furnace to a temperature of 1190-1200 ° C and rolled on TPU 8 -16 ”in the caliber 383 mm into commodity pipes 377 × 25 × 11600-12100 mm in size with a hood µ = 4.59, diameter reduction Δ = 29.6% and with feeds of sleeves to the deformation zone µ = 17-18 mm. Accepted in accordance with TU 14-3R-55-2001 - 13.801 tons. The expenditure coefficient of the metal for this batch of pipes was 1.261. Thus, when rolling commodity pipes with a size of 377 × 25 mm by the proposed method, a reduction in the expenditure coefficient of the metal by 116 kg for each ton of pipes was obtained, while simultaneously increasing the productivity of TPU 8-16 ”twice. A similar picture was obtained when rolling commodity pipes measuring 377 × 35 mm. According to the existing method, commodity pipes with a size of 377 × 35 mm are produced from ESR ingots-blanks with a size of 565 × 100 × 1750 ± 50 mm according to the technology: ingots-blanks are heated to a plasticity temperature and flashed in a cross-screw rolling mill into 550 × blanks ext. 265 × 2230-2360 mm on a mandrel with a diameter of 250 mm with an exhaust hood µ = 1.31 and a diameter fit Δ = 2.66%; the billet sleeves from a cold embankment are heated in a methodical furnace to a plasticity temperature; sleeves-blanks are stitched-rolled in a cross-rolling mill in sleeves of size 540 × ext. 340 × 2880-3040 mm on a mandrel with a diameter of 325 mm with an extractor µ = 1.29 and a diameter fit Δ = 1.82; the sleeves are rolled at 8-16 ”TPU with pilgrim mills into commodity pipes measuring 377 × 35 × 8750-9300 mm. According to this technology, 5 ingot blanks with a total mass of 17.219 tons were commissioned. Five pipes 377 × 25 × 8500-9000 mm in size with a total weight of 13.375 tons were commissioned in accordance with TU 14-3R-55-2001 with a total weight of 13.375 tons. party amounted to 1,254. According to the proposed method in accordance with paragraphs. 4-6 of the claims, 5 hollow ingots-blanks with a size of 540 × ext. 200 × 2100 ± 50 mm with a total weight of 16,356 tons were set into production. Hollow ingots-blanks were heated in a method furnace to a temperature of 1180-1190 ° C, stitched - rolled out a cross-helical rolling mill into sleeves measuring 540 × in. 340 × 2640-2750 mm on a mandrel with a diameter of 325 mm with a hood of 1.29 and rolled on TPU 8-16 ”in caliber 383 mm into commodity pipes of 377 × 35 × 8900- 9300 mm with a hood µ = 4.84, compression in diameter Δ = 29.6% and with feeds of sleeves into the deformation zone µ = 21-22 mm. Accepted in accordance with TU 14-3R-55-2001 - 13.861 tons of pipes. The expenditure coefficient of the metal for this batch of pipes amounted to 1,180. When rolling commodity pipes with a size of 377 × 35 mm by the proposed method, a reduction in the expenditure coefficient of the metal by 74 kg for each ton of pipes was obtained while simultaneously increasing the productivity of TPU 8-16 ”by half. Data on rolling of conversion pipes of 426 × 23 mm and 392 × 33 mm, commodity pipes of 377 × 25 and 377 × 35 mm made of steel grade 10X9MFB-Sh on TPU 8-16 ”with pilgrim mills, machining of conversion pipes of 392 × 33 and rolling of conversion pipes of 426 × 23 mm in size into commodity pipes of 377 × 18 mm in size at the KhPT 450 mill of ChTPZ OJSC are shown in Table 1.

Thus, the use of the proposed method will allow for the first time in Russia to produce seamless pipes with a size of 377 × 14-40 mm from hollow ingot blanks of ESR, and pipes with a size of 377 × 40-60 mm from ingot blanks of ESR for steam boilers, steam pipelines and plant collectors with high and supercritical steam parameters with the mechanical properties of the metal and geometric dimensions that exceed the values of these indicators given in TU 14-3R-55 - 2001, which will significantly reduce energy consumption by eliminating ingot heating - blanks for flashing into blanks-blanks, heating blanks-blanks for flashing-rolling them into blanks, reducing loads when flashing ingots-blanks ESR with differentiated compressions in diameter and to produce high-quality commodity and conversion pipes on TPU 8-16 ”with pilgrim mills of OJSC “ChTPZ” for the subsequent redistribution of conversion pipes into commodity ones at the KhPT 450 mill in accordance with customer orders, to significantly reduce the expenditure coefficient of the metal during the redistribution of the EAW ingot-billet - boiler pipe, to increase productivity be TPU 8-16 "pilger with more than 2 times and, consequently, reduce the cost of boiler tubes.

Claims (7)

1. Method for the production of seamless pipes of 377 × 14-60 mm in size for steam boilers, steam pipelines and manifolds of plants with high and supercritical steam parameters from steel grade 10X9MFB-Sh, including ingots melting by electroslag remelting (ESR), machining-turning of ingots into ingots - workpieces with a size of 490 × 1750 ± 50 mm and 565 × 1750 ± 50 mm, drilling in ingots-blanks of a central hole with a diameter of 100 ± 5 mm, heating ingots-blanks to a temperature of plasticity, piercing them in a cross-helical rolling mill into blanks cooled sleeve blanks, repair of sleeve blanks, if necessary, re-heating of sleeve blanks from a cold embankment to a plasticity temperature, piercing-rolling of sleeve blanks in a cross-helical rolling mill into sleeves and rolling of sleeve into commodity pipes, ultrasonic inspection, pipe acceptance with a tolerance of + 1.25 / -1.0% in diameter and + 20 / -5.0% in wall thickness, characterized in that pipes 377 × 14-19 mm in size are produced at the KhPT 450 mill from hot-rolled hot-rolled pipes of 426 × 21 mm and 426 × 23 mm, commodity pipes measuring 377 × 20-30 mm are produced on TPU 8-16 '' with pilig with imov mills from hollow ingot billets of electroslag remelting of 540 × vn. 360 × 3200 ± 50 mm and 540 × vn. 340 × 3200 ± 50 mm in size, commodity pipes 377 × 31-40 mm in size from hollow ingot-billets of 540 × vn .200 × 2100 ± 50 mm, and pipes 377 × 41-60 mm in size from ESR ingots of 565 × 100 × 1750 mm in size. 2. The method according to claim 1, characterized in that the conversion pipes of 426 × 21 mm and 426 × 23 mm are produced from hollow ingots of electroslag remelting, which are grinded and bored into hollow ingots-blanks with a size of 600 × ext. 400 × 3200 ± 50 mm, ingot billets are heated to a temperature of 1180-1200 ° C and rolled at 8-16 '' TPU with pilgrim mills into redox pipes of 426 × 21 × 151000-15700 mm and 426 × 23 × 13600-14200 mm in size with hoods, respectively µ = 5.76 and μ = 5.29, compression in diameter of 28.3% and with feeds of sleeves into the deformation zone m = 15-18 mm, a piece of technological waste is produced - seed of the ends and pilgrim heads with a hot cutting saw, straightening on a six-roll straightening machine, heat treatment, repair, if necessary, is cut into two pipes of equal length and taken with a tolerance of + 1.25 / -1.0 in diameter and ± 12 wall thickness ,5%. 3. The method according to claim 2, characterized in that the conversion pipes of 426 × 21 × 7550-7850 mm in size are rolled at the KhPT 450 mill into commodity cold-rolled pipes of 377 × 14 × 12300-12800 mm, 377 × 15 × 11600-12000 mm and 377 × 16 × 10800-11200 mm with hoods, respectively, µ = 1.67, µ = 1.57 and µ = 1.47, and conversion pipes of 426 × 23 × 6800-7100 mm in size are rolled at the KhPT 450 mill into commodity pipes 377 × 17 × 10000-10500 mm, 377 × 18 × 9400-9800 mm and 377 × 19 × 8900-8300 mm in size with hoods µ = 1.52, µ = 1.43 and µ = 1.38; heat treatment , editing, ultrasonic inspection and acceptance of pipes with tolerances in diameter of ± 1.0% and wall thickness + 15 / -5%. 4. The method according to claim 1, characterized in that the pipes with a diameter of 377 mm with wall thicknesses from 20 to 30 mm are made from hollow ingots of electroslag remelting, which are grinded and bored into hollow ingots-blanks of size 540 × ext. 360 × 3200 ± 50 mm and 540 × ext. 340 × 3200 ± 50 mm, heated to a temperature of 1190-1200 ° C and rolled on 8-16 '' TPU with pilgrim mills into commodity pipes 377 × 20 × 14600-14700 - 377 × 30 × 10300 -9300 mm with hoods from μ = 5.43 to μ = 3.91, compression by diameter of 29.6% and with feeds of sleeves into the deformation zone m = 17-19 mm, pipes with a diameter of 377 mm with wall thicknesses from 31 to 40 mm produced from p of electroslag remelting ingots, which are turned and bored into hollow ingots-blanks of size 540 × ext. 200 × 2100 ± 50 mm, are heated to a temperature of 1180-1190 ° С, stitched-rolled in a cross-helical rolling mill without diameter rise into sleeves 540 × in. 340 × 2840-3010 mm and 540 × in. 315 × 2620-2750 mm in size on mandrels with a diameter of 325 and 300 mm with hoods µ = 1.4 and µ = 1.28, which are rolled on TPU 8-16 '' with pilgrim mills in commodity pipes measuring 377 × 31 × 9100-9700 - 377 × 40 × 7700-8200 mm with hoods from µ = 3.88 to µ = 3.35, compression by diameter of 29.6% and with feeds sleeves in the deformation zone m = 21 -24 mm, and pipes with a diameter of 377 mm with wall thicknesses from 41 to 60 mm are rolled from ESR ingots-blanks with a size of 565 × 100 × 1750 ± 50 mm, which are heated to a temperature of 1200-1220 ° C, stitched in a cross-helical rolling mill in sleeves of size 550 × ext. 315 × 2530-2680 mm and 550 × ext. 290 × 2360-2500 mm on mandrels with a diameter of 300 and 275 mm with hoods µ = 1.49 and µ = 1.39 and fit in diameter Δ = 2.65%, sleeves are rolled at 8-16 '' TPU with pilgrim mills into commodity pipes 377 × 41 × 8000-8500 - 377 × 60 × 5400-5800 mm with hoods from µ = 3.55 to µ = 2, 71, compression in diameter of 30.9% and with feeds of sleeves into the deformation zone m = 23-26 mm, about harass a segment of technological waste - seed ends and pilgrim heads with a hot cutting saw, straightening on a six-roll straightening machine, heat treatment, etching, repair, ultrasonic inspection and pipe acceptance with a tolerance of + 1.25 / -1.0% in diameter and wall thickness + 20 / -5.0%. 5. The method according to claim 1, characterized in that the rolling of commodity pipes on TPU with pilgrim mills is made from hollow ingots-blanks with a drawing coefficient µ≥3.5, and the wall thicknesses of the hollow ingots during casting are determined from the expression

,
where k = 0.97-0.98 is a coefficient that takes into account the value of fumes when heating the metal in a methodical furnace, large values of which are taken when heating metal from alloyed steel grades;
D _s - the outer diameter of the hollow ingot billet, mm;
D _m - the diameter of the hot-rolled commodity pipe, mm;
S _m - wall thickness of the hot-rolled commodity pipe, mm;
µ≥3.5 is the drawing coefficient when rolling commodity hot-rolled pipes on a pilgrim mill from hollow ingots-billets;
Δ _o - allowance for turning hollow ingots into hollow ingots-blanks, mm;
Δ _p - allowance for hollow ingots into hollow ingots-blanks, mm 6. The method according to claim 2, characterized in that after issuing from the furnace before transportation to the pilgrim mill in hollow ingots-blanks of size 600 × ext. 400 × 3200 × ± 50 mm, 540 × ext. 360 × 3200 ± 50 mm and 540 × in. 340 × 3200 ± 50 mm serves the lubricant in the form of a mixture of graphite with sodium chloride (50/50) weighing 500-800 g, and in ingots of 565 × 100 × 1750 mm and ingots of 540 × vn. 200 × 2100 ± 50 mm, a grease weighing 300-500 g and 400-600 g is fed into the central hole before flashing and flashing. 7. The method according to claim 4, characterized in that the hot-rolled steel tubes at TPU 8-16 '' with pilgrim mills are produced with hoods µ = 5.76 and µ = 5.29, and hot-rolled commodity tubes with a size of 377 × 20-30 mm - with hoods from µ = 5.43 to µ = 3.91, hot-rolled commodity pipes with a size of 377 × 31-40 mm - with total hoods from µ _∑ = 5.43 to µ _∑ = 4.29, commodity pipes with a size of 377 × 41-60 mm - with total hoods from µ _∑ = 5.29 to µ _∑ = 3.76, and commodity cold-rolled pipes 377 × 14-19 mm in size are produced with total hoods

before

, lower values of which relate to pipes with lower D / S ratios and are determined from the expressions
µ _∑ = µ _sp. µ _p ,

,
where µ _ave. - hood when flashing the ingots and flashing-rolling the hollow ingots-blanks into sleeves in a cross-helical rolling mill;
µ _p - hood during rolling of conversion and commodity pipes on a pilgrim mill;
µ _x - hood when rolling the conversion pipes into commodity ones at the HPT 450 mill.