RU2013111215A - METHOD FOR PRODUCING SEAMLESS PIPES OF 273 × 9-60 mm SIZE FOR STEAM BOILERS, STEAM PIPELINES, AND COLLECTORS OF UNITS WITH HIGH AND SUPERCRITICAL PARAMETERS OF STEAM FROM 10 ELECTRIC SLAG SINES - 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 electroslag remelting ingots of steel grade 10X9MFB-Sh, including ingots melting by electroslag remelting, machining-turning of ingots into ingots - workpieces, 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 cross-helical mills in sleeves with meta deformation along the location of the crystals by means of the task of ingots in the mill by the head part and with a diameter of 8-16% inlet, rolling the sleeves on the pilgrim mills into commodity pipes 273 × 16-60 mm in size, heat treatment, etching, dressing, ultrasonic inspection and acceptance pipes with a tolerance of + 1.25 / -1.0% in diameter and + 20 / -5.0% wall thickness, characterized in that pipes with a size of 273 × 9-13 mm are produced from ingots-blanks of electroslag remelting with a size of 470 × 100 × 1750 ± 50 mm, which are heated to a temperature of 1200-1210 ° C, stitched in a cross-helical mill tools with a size of 500 × ext. 365 × 2980-3150 mm on a mandrel with a diameter of 350 mm with a hood µ = 1.75 and a rise in diameter of 6.3-6.5%, the sleeves are rolled on 8-16 "TPU with pilgrim mills in pipes with a size of 377 × 22 × 8000-8500 mm with a hood µ = 3.74 and compression in diameter of 24.6%, conversion pipes with a size of 377 × 22 × 8000-8500 mm are heat treated and rolled at a steel mill ХПТ 450 into 325 × 15 × 13200-14000, 325 × 16 × 12400-13200, 325 × 17 × 11700-12400 and 325 × 18 × 1100-11800 mm with hoods, respectively, µ = 1.68, µ = 1.58, µ = 1 , 68, µ = 1.49 and µ = 1.41, the cold-rolled conversion tubes are heat treated, cut into equal length pipes

Claims (4)

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 electroslag remelting ingots of steel grade 10X9MFB-Sh, including ingots melting by electroslag remelting, machining-turning of ingots into ingots - workpieces, 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 cross-helical mills in sleeves with meta deformation along the location of the crystals by means of the task of ingots in the mill by the head part and with a diameter of 8-16% inlet, rolling the sleeves on the pilgrim mills into commodity pipes 273 × 16-60 mm in size, heat treatment, etching, dressing, ultrasonic inspection and acceptance pipes with a tolerance of + 1.25 / -1.0% in diameter and + 20 / -5.0% wall thickness, characterized in that pipes with a size of 273 × 9-13 mm are produced from ingots-blanks of electroslag remelting with a size of 470 × 100 × 1750 ± 50 mm, which are heated to a temperature of 1200-1210 ° C, stitched in a cross-helical mill tools with a size of 500 × ext. 365 × 2980-3150 mm on a mandrel with a diameter of 350 mm with a hood µ = 1.75 and a rise in diameter of 6.3-6.5%, the sleeves are rolled on 8-16 "TPU with pilgrim mills in pipes with a size of 377 × 22 × 8000-8500 mm with a hood µ = 3.74 and compression in diameter of 24.6%, conversion pipes with a size of 377 × 22 × 8000-8500 mm are heat treated and rolled at a steel mill ХПТ 450 into 325 × 15 × 13200-14000, 325 × 16 × 12400-13200, 325 × 17 × 11700-12400 and 325 × 18 × 1100-11800 mm with hoods, respectively, µ = 1.68, µ = 1.58, µ = 1 , 68, µ = 1.49 and µ = 1.41, the cold-rolled conversion tubes are heat treated, cut into equal length pipes lengths, conversion pipes 325 × 15 × 6600-7000 mm in size are rolled on the KhPT 450 mill into commodity pipes of 273 × 9 × 12600-13300 mm in size, conversion tubes 325 × 16 × 6200-6600 are rolled into commodity pipes of 273 × 10 × 11300-12000 mm, conversion pipes 325 × 17 × 5850-6200 mm in commodity pipes 273 × 11 × 10300-1100, and conversion pipes 325 × 18 × 5500-5900 mm in commodity pipes 273 × 12 × 9400- 10100 and 273 × 13 × 8600-9300 mm with hoods, respectively, µ = 1.96, µ = 1.88, µ = 1.82, µ = 1.76, and µ = 1.64, pipes measuring 273 × 14-15 mm are produced from ingots-blanks of electroslag remelting with a size of 490 × 100 × 1750 ± 50 mm, The others are heated to a temperature of 1190-1200 ° C, stitched in a cross-screw mill in a sleeve 500 × in. 315 × 2540-2700 mm in size on a mandrel with a diameter of 300 mm with a hood µ = 1.50 and a rise in diameter of 1.9- 2.1%, sleeves are rolled on 8-16 "TPU with pilgrim mills into 325 × 20 × 12600-13600 mm conversion tubes with a hood µ = 6.17 and 35.0% diameter compression, 325 × 20 conversion tubes × 12600-13600 mm is heat-treated, cut into equal length pipes and rolled at the KhPT 450 mill into commodity pipes of 273 × 14 × 10300-11100 and 273 × 15 × 9600-10400 mm with hoods µ = 1.68 and µ = 1.58, commodity tr loss with a diameter of 273 mm with wall thicknesses from 16 to 30 mm is produced on a 8-16 "TPU with pilgrim mills from ESR ingot blanks measuring 430 × 100 × 1750 ± 50 mm, which are heated to the ductility temperature, stitched in a cross-helical rolling mill in sleeves measuring 460 × in. 265 × 2060-2180, 460 × in. 240 × 1890-2000 mm on mandrels with a diameter of 250 and 225 mm with a diameter rise of 6.9-7.1% and hoods µ = 1.21 and µ = 1,11, sleeves of size 460 × in. 265 × 2060-2180 - 460 × in. 240 × 1890-2000 mm are rolled on a pilgrim mill in commodity pipes of size 273 × 16 × 14200-15200 - 273 × 30 × 8000- 8500 mm with hoods from µ = 8.59 to µ = 5.28 and compression according to 40.7% ameter, commodity pipes with a diameter of 273 mm with wall thicknesses from 31 to 60 mm are produced at 8-16 "TPU with pilgrim mills from ESR ingots-blanks of 470 × 100 × 1750 ± 50 mm in size, which are heated to the ductility temperature, they are stitched in a cross-mill rolling mill into sleeves of size 460 × ext. 240 × 22800-2400 and 460 × ext. 175 × 1940-2050 mm on mandrels with a diameter of 225 and 175 mm with a rise in diameter of 6.9-7.1% and with hoods µ = 1.34 and µ = 1.14, sleeves of size 460 × ext. 240 × 2280-2400 - 460 × ext. 175 × 1940-2050 mm are rolled on a pilgrim mill in commodity pipes of size 273 × 31 × 9200-9800 - 273 × 60 × 5400-5800 mm with hoods from µ = 5.13 about µ = 3.54 and a compression of 40.7% in diameter, the pipes are cut into lengths in accordance with the order, pipes with a size of 273 × 9-15 mm are taken with a tolerance of ± 1.0% in diameter and + 15 / -5 wall, 0, and pipes with a size of 245 × 16-60 mm are accepted with a tolerance of + 1.25 / -1.0 in diameter and + 20 / -5.0% wall thickness. 2. The method according to claim 1, characterized in that the commodity pipes 273 × 16-60 mm are produced on TPU 8-16 "with pilgrim mills from ESR ingots, which are heated in methodological furnaces to a deformation temperature, the values of which are determined from the expression t _m = t _nom. + (D / S) t, where t _nom. = 1180 - nominal heating temperature of ingots with a diameter of 430 mm for firmware, ° C; D is the diameter of the pipes, mm; S is the wall thickness of the pipes, mm; t is the coefficient, ° C. 3. The method according to claim 1, characterized in that the firmware of the ESR ingots in the transverse helical rolling mill is produced on mandrels with the formation of inner liner diameters larger than the diameter of the pilgrim mill mandrels, the values of which are determined from the expression d _ext. = d _d + Δ + (D / S) K≤40, where d _d is the average diameter of the mandrel, mm; Δ = 20 is the average difference between the diameter of the mandrel and the inner diameter of the sleeve, mm; K - coefficient, mm the sleeves are rolled in a pilgrim mill into commodity pipes in a caliber of 280 mm with wall thicknesses in accordance with the portfolio of orders. 4. The method according to PP.2 and 3, characterized in that the rolling of commodity pipes of size 273 × 16-60 mm on TPU 8-16 "with pilgrim mills is performed with the feed of the sleeve into the deformation zone, the value of which is determined from the expression $$m_j=m_{16}+\frac{m_{16}}{{\mu }_j}$$

, where m ₁₆ - 16-18 - the value of the feed sleeve into the deformation zone when rolling pipes 273 × 16 mm in rolls with a caliber of 280 mm; μ _j - value drawing while rolling pipes 273 mm in diameter with J - wall thickness.