RU2012152615A - METHOD FOR PRODUCING SEAMLESS PIPES OF 273 × 9-60 mm SIZE FOR STEAM BOILERS, STEAM PIPELINES, AND COLLECTORS OF UNITS WITH HIGH AND SUPERCRITICAL STEAM PARAMETERS FROM STEEL 10X9MFB-SH STEEL - Google Patents

Abstract

1. Method for the production of seamless pipes 273 × 9-60 mm in size for steam boilers, steam pipelines and manifolds of plants with high and supercritical parameters of steam from 10Kh9MFB-Sh steel, which includes the smelting of ingots, followed by forging them into forgings with a cast iron ≥ 2.5 or casting ingots by electroslag remelting, machining-turning of forgings and ingots of ESR into blanks and ingots-blanks of size 430 × 1750 ± 50 mm, drilling in blanks and ingots-blanks of ESR of a central hole with a diameter of 100 ± 5.0 mm, heating of blanks and ingots- blanks d ductility temperatures, piercing them in a cross-helical rolling mill into sleeves, rolling the sleeves on pilgrim mills into commodity pipes of 273 × 16-60 mm in size and conversion tubes in sizes of 290 × 26-32 mm, dressing, heat treatment, machining-turning and boring of conversion pipes into commercial ones with a size of 273 × 9-15 mm, ultrasonic testing, acceptance of pipes with a tolerance of + 1.25 / -1.0% in diameter and + 20 / -5.0% in wall thickness, characterized in that the pipes are sized 273 × 9-15 mm are produced at the KhPT 450 mill from hot-rolled steel tubes in the sizes 377 × 20 and 377 × 22 mm, commodity 273 × 16-25 mm pipes are produced at 8-16 '' TPU with pilgrim mills from hollow ingots-blanks of electroslag remelting of 430 × ext. 250 × 3200 ± 50 mm in size, commodity pipes of 273 × 26-35 mm in size from hollow ingot blanks measuring 430 × ext. 230 × 3200 ± 50 mm, tubes measuring 273 × 36-45 mm from ingot blanks ESR 430 × 100 × 1750 ± 50 mm, and commodity pipes measuring 273 × 46-60 mm from ingots ESW blanks of 470 × 100 × 1750 ± 50 mm in size. 2. The method according to claim 1, characterized in that. that the conversion pipes 377 × 20 and 377 × 22 mm in size are produced from hollow ingots of electroslag remelting, which are turned

Claims (5)

1. Method for the production of seamless pipes 273 × 9-60 mm in size for steam boilers, steam pipelines and manifolds of plants with high and supercritical parameters of steam from 10Kh9MFB-Sh steel, which includes the smelting of ingots, followed by forging them into forgings with a cast iron ≥ 2.5 or casting ingots by electroslag remelting, machining-turning of forgings and ingots of ESR into blanks and ingots-blanks of size 430 × 1750 ± 50 mm, drilling in blanks and ingots-blanks of ESR of a central hole with a diameter of 100 ± 5.0 mm, heating of blanks and ingots- blanks d ductility temperatures, piercing them in a cross-helical rolling mill into sleeves, rolling the sleeves on pilgrim mills into commodity pipes of 273 × 16-60 mm in size and conversion tubes in sizes of 290 × 26-32 mm, dressing, heat treatment, machining-turning and boring of conversion pipes into commercial ones with a size of 273 × 9-15 mm, ultrasonic testing, acceptance of pipes with a tolerance of + 1.25 / -1.0% in diameter and + 20 / -5.0% in wall thickness, characterized in that the pipes are sized 273 × 9-15 mm are produced at the KhPT 450 mill from hot-rolled steel tubes in the sizes 377 × 20 and 377 × 22 mm, commodity 273 × 16-25 mm pipes are produced at 8-16 '' TPU with pilgrim mills from hollow ingots-blanks of electroslag remelting of 430 × ext. 250 × 3200 ± 50 mm in size, commodity pipes of 273 × 26-35 mm in size from hollow ingot blanks measuring 430 × ext. 230 × 3200 ± 50 mm, tubes measuring 273 × 36-45 mm from ingot blanks ESR 430 × 100 × 1750 ± 50 mm, and commodity pipes measuring 273 × 46-60 mm from ingots ESW blanks measuring 470 × 100 × 1750 ± 50 mm. 2. The method according to claim 1, characterized in that. that the conversion pipes 377 × 20 and 377 × 22 mm are produced from hollow ingots of electroslag remelting, which are grinded and bored into hollow ingots-blanks of 540 × in. 360 × 3200 × 50 mm in size, the ingots-blanks are heated to a temperature of 1170-1180 ° C and rolled at 8-16 '' TPU with pilgrim mills into redistribution pipes 377 × 20 × 15100-15650 and 377 × 22 × 13500-14000 mm with hoods, respectively, µ = 5.59 and µ = 5.08, a compression of 29.6% in diameter and with feeds of sleeves into the deformation zone m = 17-20 mm, a piece of technological waste is made - seed ends and pilgrim heads saw hot cutting, straightening at a six-high leveler, heat treatment, repair, if necessary, is cut into two tubes - times range equal length and take a tolerance on diameter + 1.25 / -1.0 and wall thickness ± 12,5%. 3. The method according to PP.1 and 2, characterized in that the conversion pipe size 377 × 20 × 7550-7825 mm is rolled on a cold mill 450 into a conversion cold-rolled pipe size 325 × 14 × 12000-12400 mm, cut into two pipes - Krat of equal length and rolled on the KhPT 450 mill into commodity pipes of 273 × 9 × 10,600-11,000, 273 × 10 × 9500-9800, 273 × 11 × 8700-9000 and 273 × 12 × 8000-8300 mm with hoods, respectively, µ = 1 , 83, μ = 1.65, μ = 1.51 and μ = 1.39. and conversion pipes 377 × 22 × 6750-7000 mm in size are rolled at the KhPT 450 mill into cold rolled coars of 325 × 18 × 9300-9650 mm in size, which are rolled at the HPT 450 mill into commodity pipes of 273 × 13 × 14850-154000, 273 × 14 × 13700-14250 and 273 × 15 × 12900-13400 mm with hoods, respectively, µ = 1.64, µ = 1.52, µ = 1.51 and 1.43, heat treatment, dressing, ultrasonic inspection and acceptance pipes with tolerances in diameter ± 1.0% and wall thickness + 15 / -5%. 4. The method according to claim 1, characterized in that. that commodity pipes with a diameter of 273 mm with wall thicknesses from 16 to 25 mm are produced at 8-16 '' TPU with pilgrim mills from hollow ingots of electroslag remelting, which are grinded and bored into hollow ingots-blanks with a size of 430 × ext. 250 × 3200 ± 50 mm, heated to a temperature of 1170-1180 ° C and rolled on a 8-16 '' TPU with pilgrim mills into commodity pipes measuring 273 × 16 × 18200-18900 - 273 × 25 × 12300-12750 mm with hoods from µ = 6.59 up to µ = 4.54, compression in diameter of 36.0% and with feeds of sleeves into the deformation zone m = 18-20 mm, pipes with a diameter of 273 mm with wall thicknesses from 26 to 35 mm are made from hollow liters of electroslag remelting, which are turned and bored into hollow ingots-billets of 430 × vn. 230 × 93200 ± 50 mm in size, heated to a temperature of 1160-1170 ° C and rolled on 8-16 '' TPU with pilgrim mills into 273 size pipes × 26 × 12800-13300 - 273 × 35 × 9500-9900 mm with hoods from µ = 4.71 to µ = 3.66, diameter reduction of 36.0% and with feeds of sleeves into the deformation zone m = 19-21 mm , pipes with a diameter of 273 mm with wall thicknesses from 36 to 45 mm are rolled from ESR ingots-blanks with a size of 430 × 100 × 1750 ± 50 mm, which are heated to a temperature of 1160-1180 ° C, stitched in a cross-screw mill rollers in sleeves of sizes 450 × in. 240 × 2000-2120 and 450 × in. 215 × 1860-1980 mm on mandrels with a diameter of 225 and 200 mm with hoods µ = 1.18 and µ = 1.10, diameter rise δ = 4.65%, sleeves are rolled at 8-16 '' PTU with pilgrim mills into commodity pipes measuring 273 × 36 × 6500-7000 - 273 × 45 × 5700-6100 mm with hoods from µ = 4.01 to µ = 3, 62, with a compression of 38.9% in diameter and with feeds of sleeves into the deformation zone m = 21-23 mm, and pipes with a diameter of 273 mm with wall thicknesses from 46 to 60 mm are rolled from ESR ingots-blanks with a size of 470 × 100 × 1750 ± 50 mm, which are heated to a temperature of 1160-1170 ° C, is flashed in a cross-helical rolling mill in gy 450 × vn. 215 × 2240-2380 and 450 × vn. 165 × 2000-2120 mm lakes on mandrels with a diameter of 200 and 150 mm with hoods μ = 1.32 and μ = 1.18, diameter fit Δ = 4, 26%, sleeves are rolled at 8-16 '' TPU with pilgrim mills into commodity pipes measuring 273 × 46 × 7000-7500 - 273 × 60 × 5700-6000 mm with hoods from µ = 3.56 to µ = 3.28, and taking into account the hood at the cross-helical rolling mill from μ _Σ = 4.7 to μ _Σ = 3.87 and a compression of 38.9% in diameter, with the feeds of sleeves into the deformation zone m = 22-25 mm, a piece of technological waste is produced - seed ends and pilgrim heads with a hot cutting saw, correcting on a six-roll correctly th car, heat treatment, etching, repair, ultrasonic inspection and acceptance of a tolerance on pipe diameter + 1.25 / -1.0% and a wall thickness of 20 + / -5.0%. 5. The method according to claims 1 to 4, characterized in that the hot-rolled steel tubes on TPU 8-16 '' with pilgrim mills are produced with hoods µ = 5.59 and µ = 5.08, and commodity hot-rolled tubes 273 × 16 in size -35 mm with hoods from µ = 6.59 to µ = 3.66, hot-rolled commodity pipes with a size of 273 × 36-45 mm with total hoods from µ _Σ = 4.73 to µ _Σ = 3.98, commodity pipes with a size of 273 × 46-60 mm with total hoods from µ _Σ = 4.7 to µ _Σ = 3.87, and commodity cold-rolled pipes with a size of 273 × 9-15 mm are produced with total hoods $${\mu }_{\Sigma }^{\mathrm{one}}=10.23$$

before $${\mu }_{\Sigma }^{\mathrm{one}}=7.26$$

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

, where µ _ave. - hood when piercing 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 during rolling of the conversion pipes into commodity ones at the HPT 450 mill.