RU2013112308A - METHOD FOR PRODUCING SEAMLESS PIPES OF 377 × 14-60 mm SIZE FOR STEAM BOILERS, STEAM PIPELINES, AND MANIFOLD PUMPS FOR INSTALLATIONS WITH HIGH AND SUPERCRITICAL PARAMETERS OF STEAM FROM 10 ELECTRIC SLUG SINES - Google Patents

Abstract

1. 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 parameters of steam from electroslag remelting ingots of 10Kh9MFB-Sh steel, 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 rolling mills in sleeves, rolling sleeves on pilgrim mills into commodity pipes 377 × 20-60 mm in size, heat treatment, etching, dressing, ultrasonic inspection and pipe acceptance with a tolerance of + 1.25 / -1.0% in diameter and + 20 / -5.0% in wall thickness characterized in that the pipes 377 × 14-19 mm in size are produced from ingots-blanks of electroslag remelting with a size of 565 × 100 × 1750 ± 50 mm, which are heated to a temperature of 1200-1210 ° C, stitched in a cross-helical rolling mill workpieces with a size of 580хvn. 290 × 2040-2160 mm on a mandrel with a diameter of 275 mm with a hood µ = 1.20 and a rise in diameter of 2.6-2.8%, cooling blanks give, repair if necessary, the billet sleeves from a cold embankment are reheated to a temperature of 1210-1220 ° C, the billet sleeves are stitched and rolled in a cross-screw mill into 600hvn. 415 × 2690-2850 mm sleeves on a mandrel with a diameter of 400 mm with an extractor µ = 1.32 and an increase in diameter of 3.4–3.6%, the sleeves are rolled at 8-16 ”TPU with pilgrim mills into conversion tubes of 426 × 21 × 11800-12700 and 426 × 23 × 10150-11000 mm with hoods µ = 5.52, µ = 5.07 and compression in diameter of 29.0%, technological waste is cut off with a hot cutting saw, corrected with a six-roll straightener

Claims (4)

1. 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 parameters of steam from electroslag remelting ingots of 10Kh9MFB-Sh steel, 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 rolling mills in sleeves, rolling sleeves on pilgrim mills into commodity pipes 377 × 20-60 mm in size, heat treatment, etching, dressing, ultrasonic inspection and pipe acceptance with a tolerance of + 1.25 / -1.0% in diameter and + 20 / -5.0% in wall thickness characterized in that the pipes 377 × 14-19 mm in size are produced from ingots-blanks of electroslag remelting with a size of 565 × 100 × 1750 ± 50 mm, which are heated to a temperature of 1200-1210 ° C, stitched in a cross-helical rolling mill workpieces with a size of 580хvn. 290 × 2040-2160 mm on a mandrel with a diameter of 275 mm with a hood µ = 1.20 and a rise in diameter of 2.6-2.8%, cooling blanks give, repair if necessary, the billet sleeves from a cold embankment are reheated to a temperature of 1210-1220 ° C, the billet sleeves are stitched and rolled in a cross-screw mill into 600hvn. 415 × 2690-2850 mm sleeves on a mandrel with a diameter of 400 mm with an extractor µ = 1.32 and an increase in diameter of 3.4–3.6%, the sleeves are rolled at 8-16 ”TPU with pilgrim mills into conversion tubes of 426 × 21 × 11800-12700 and 426 × 23 × 10150-11000 mm with hoods µ = 5.52, µ = 5.07 and compression in diameter of 29.0%, technological waste is cut off with a hot cutting saw, corrected with a six-roll straightener machine, heat treat, repair, cut into two pipes of equal length, hot-rolled conversion pipes of 426 × 21 × 5900-6350 mm in size are rolled at the KhPT 450 mill into commodity cold-rolled pipes of 377 × 14 × 9550-10300, 377 × 15 × 9200-9970 and 377 × 16 × 8700-9050 mm with hoods, respectively, µ = 1.67, µ = 1.57 and µ = 1.47, hot-rolled conversion tubes of 426 × 23 × 5075-5500 mm in size are rolled at the HPT 450 mill into commodity cold-rolled pipes of size 377 × 17 × 7700-8350, 377 × 18 × 7250-7850 and 377 × 19 × 6900-7500 mm with hoods, respectively, µ = 1.52, µ = 1.43 and µ = 1.36, pipes with a diameter of 377 mm with wall thicknesses from 20 to 40 mm are produced at 8-16 ”TPU with pilgrim mills from ESW ingots-blanks measuring 490 × 100 × 1750 ± 50 mm, which are heated to the ductility temperature, stitched in a transverse helical rolling mill into sleeves of sizes 520хвн.365x2800-2950 and 520хвн.325 × 2320-2450 mm on mandrels with a diameter of 350 and 310 mm with a rise in diameter of 5.9-6.2%, with hoods µ = 1.64 and µ = 1.37, sleeves of size 520хвн. 365 × 2800-2950 - 520хвн .325 × 2320-2450 mm are rolled on a pilgrim mill into commodity pipes 377 × 20 × 9800-10500 - 377 × 40 × 5300-5700 mm in size with hoods from µ = 4.59 to µ = 2.93 and compression in diameter 27 , 5%, commodity pipes with a diameter of 377 mm walls of 41 to 60 mm are produced on 8–16 ”TPU with pilgrim mills from ESR ingots-blanks of 565 × 100 × 1750 ± 50 mm in size, which are heated to ductility temperature, stitched in a cross-helical rolling mill into 540хvn sleeves. 325 × 2770-2930 and 540хвн.29 540хвн.290 × 2480-2620 mm on mandrels with a diameter of 310 and 275 mm with a fit in diameter of 4.3-4.5% with hoods µ = 1.63 and µ = 1.46, sleeves measuring 540hvn.325 × 2770-2930 - 540hvn.290 × 2480-2620 mm are rolled on 8-16 ”TPU with pilgrim mills into commodity pipes 377 × 41 × 7650-8200 - 377 × 60 × 5500-5800 mm with hoods from μ = 3.31 to μ = 2.62 and compression by diameter ru 27.5%, pipes are cut into lengths in accordance with the order, pipes with a size of 377 × 14-19 mm are accepted with a tolerance of ± 1.0% in diameter and a wall of + 15 / -5%, and pipes with a size of 377 × 20-60 mm is accepted with a tolerance of + 1.25 / -1.0% in diameter and + 20 / -5.0% in wall. 2. The method according to claim 1, characterized in that the commodity pipes of 377 × 20-60 mm in size are produced at 8-16 ”TPU with pilgrim mills from ESR ingots-blanks that are heated to the optimum deformation temperature when rolling the pipes onto a given wall, the value of which is determined from the expression t _d = t _nom. + (D / S,) t, where t _nom. = 1190 and 1200 are the nominal heating temperatures of ingot blanks with a diameter of 490 and 565 mm for firmware, ° С; D is the diameter of the rolled pipe, mm; S _i - wall thickness of the rolled pipe, mm; t is the coefficient, ° C. 3. The method according to claim 1, characterized in that the piercing of the ESR ingots-blanks into the sleeves in the cross-helical rolling mill when rolling commodity pipes at TPU8-16 ”with pilgrim mills is performed with the formation of an inner diameter of the liners larger than the diameter of the mandrel of the pilgrim mill, value which is determined from the expression d _ext. = d _d + Δ + (D / S _i ) K≤35, where d _d is the average diameter of the mandrel, mm; Δ = 20 - the difference between the diameter of the mandrel and the inner diameter of the sleeve when rolling pipes on TPU 8-16 ”of carbon steel grades, mm; K is the coefficient, mm. 4. The method according to claim 1, characterized in that the rolling of commodity pipes of 377 × 20-60 mm in size on TPU 8-16 ”with pilgrim mills is performed by feeding the sleeve into the deformation zone, the value of which is determined from the expression $$m_j=m_{\mathrm{twenty}}+\frac{m_{\mathrm{twenty}}}{{\mu }_i}$$

, where m ₂₀ - 15-16 is the feed rate of a sleeve with a diameter of 520 mm into the deformation zone of the pilgrim mill during rolling of pipes of 377 × 20 mm in rolls with a caliber of 383 mm; µ _i - the amount of drawing when rolling pipes with a diameter of 377 mm with i-wall thickness.