RU2013112451A - METHOD FOR PRODUCING SEAMLESS PIPES OF 426 × 15-60 mm SIZE FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDERS OF UNITS WITH HIGH AND SUPERCRITICAL PARAMETERS OF STEAM FROM 10 ELECTRIC SLUG SINES - Google Patents

Abstract

1. Method for the production of seamless pipes with a size of 426 × 15-60 mm 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 rolling mills in sleeves, rolling sleeves on pilgrim mills into commercial pipes measuring 426 × 21-60 mm, heat treatment, etching, dressing, ultrasonic inspection and 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 with a size of 426 × 15-20 mm are produced from ingots-blanks of electroslag remelting with a size of 620 × 100 × 1750 ± 50 mm, which are heated to a temperature of 1200-1210 ° C, stitched in a cross-helical rolling mill in workpieces with a size of 630хвн. 315 × 2090-2200 mm on a mandrel with a diameter of 300 mm with a hood µ = 1.23 and a rise in diameter of 1.5-1.7%, coolant blanks give, repair if necessary, the blanks blanks from a cold embankment are reheated to a temperature of 1190-1200 ° C, the blanks blanks are stitched-rolled into sleeves of size 640hvn.465 × 3160-3320 mm on a mandrel with a diameter of 450 mm with a hood µ = 1, 51 and a rise in diameter of 1.5-1.7%, the sleeves are rolled at 8-16 ″ TPU with pilgrim mills into redistributed pipes of 465 × 22 × 12100-12900 and 465 × 25 × 10400-11100 mm in size with hoods µ = 4 , 96, µ = 4.40, compression by diameter of 27.3% with feeds of sleeves into the deformation zone m = 15-16 and m = 16-17 mm, process waste is cut off with a hot cutting saw, corrected for hexagonal

Claims (2)

1. Method for the production of seamless pipes with a size of 426 × 15-60 mm 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 rolling mills in sleeves, rolling sleeves on pilgrim mills into commercial pipes measuring 426 × 21-60 mm, heat treatment, etching, dressing, ultrasonic inspection and 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 with a size of 426 × 15-20 mm are produced from ingots-blanks of electroslag remelting with a size of 620 × 100 × 1750 ± 50 mm, which are heated to a temperature of 1200-1210 ° C, stitched in a cross-helical rolling mill in workpieces with a size of 630хвн. 315 × 2090-2200 mm on a mandrel with a diameter of 300 mm with a hood µ = 1.23 and a rise in diameter of 1.5-1.7%, coolant blanks give, repair if necessary, the blanks blanks from a cold embankment are reheated to a temperature of 1190-1200 ° C, the blanks blanks are stitched-rolled into sleeves of size 640hvn.465 × 3160-3320 mm on a mandrel with a diameter of 450 mm with a hood µ = 1, 51 and a rise in diameter of 1.5-1.7%, the sleeves are rolled at 8-16 ″ TPU with pilgrim mills into redistributed pipes of 465 × 22 × 12100-12900 and 465 × 25 × 10400-11100 mm in size with hoods µ = 4 , 96, µ = 4.40, compression by diameter of 27.3% with feeds of sleeves into the deformation zone m = 15-16 and m = 16-17 mm, process waste is cut off with a hot cutting saw, corrected for hexagonal to the right machine, it is heat-treated, repaired, cut into two equal length pipes, hot-rolled pig tubes of 465 × 22 × 6050-6450 mm in size are rolled at the KhPT 450 mill into commodity cold-rolled pipes of 426 × 15 × 8700-9300, 426 × 16 × 8200-8700 and 426 × 17 × 7700-8300 mm with hoods, respectively, µ = 1.49, µ = 1.40 and µ = 1.33, hot-rolled conversion tubes of size 465 × 25 × 5200-5550 mm are rolled on a mill CPT 450 into commodity cold-rolled pipes of sizes 426 × 18 × 7150-7650, 426 × 19 × 6800-7200 and 426 × 20 × 6500-6900 mm with hoods, respectively, µ = 1.42, µ = 1.35 and µ = 1.29, pipes with a diameter of 426 mm with wall thicknesses to from 21 to 40 mm are produced on TPU 8-16 ″ with pilgrim mills from ingots - ESR blanks of 565 × 100 × 1750 ± 50 mm in size, which are heated to a temperature of 1200-1210 ° C, ESR ingots-blanks are stitched transversely in the mill screw rolling into sleeves-blanks of size 580 × 290 × 2040-2160 mm with a rise in diameter of 2.6-2.8% on a mandrel of 275 mm and a hood µ = 1.2, the sleeves are cooled, repaired if necessary, the sleeves are billets from a cold embankment are reheated to a temperature of 1190-1210 ° C, large values of which relate to rolling commodity pipes with a wall of 21 mm, firmware-p the blanks are rolled up in a cross-helical rolling mill into sleeves measuring 600 × 415 × 2680-2850-600 × 365 × 2200-2350 mm with a diameter rise of 3.4-3.5% on mandrels, respectively, 400 and 350 mm, with hoods 1.32 and 1.09, the diameter of which depends on the wall thickness of the pipe and the diameter of the mandrel with obtaining inner diameters of liners larger than the diameter of the mandrel of the pilgrim mill, the value of which is determined from the expression, d _ext. = d _∂ + Δ + (D / S) K≤40, where d _∂ is the average diameter of the mandrel, mm; Δ = 20 - the average difference between the diameter of the mandrel and the inner diameter of the sleeve, mm; K - coefficient, mm sleeves are rolled into commodity pipes of 426 × 21 × 10,600-11500 - 426 × 40 × 6600-7000 mm in size in pilgrim mills with hoods from µ = 5.28 to µ = 3.52 and a diameter fit of 29.0%, pipes 426 mm in diameter with wall thicknesses from 41 to 60 mm are produced on TPU 8-16 ″ with pilgrim mills from ESR ingots-blanks measuring 565 × 100 × 1750 ± 50 mm, which are heated to a temperature of 1200-1210 ° C, ESR ingots-blanks they are stitched in a cross-helical rolling mill into sleeve blanks of size 580 × 290 × 2040-2160 mm with a diameter rise of 2.6-2.8% on a mandrel of 275 mm and a hood µ = 1.2, the sleeve blanks are cooled, repaired if necessary, the billet sleeves from a cold embankment are reheated to a temperature of 1180-1200 ° C, large values of which relate to the rolling of commodity pipes with a wall of 41 mm, piercing-rolling of the billet blanks is carried out in a cross-helical rolling mill into 600-mm sleeves × 365 × 2220-2350-600 × 340 × 2060-2180 mm with a diameter rise of 3.4-3.5% on mandrels, respectively, 350 and 325 mm, with hoods 1.09 and 1.01, to obtain internal the diameters of the sleeves are larger than the diameter of the mandrel of the pilgrim mill, the value of which is determined from the expression, d _ext. = d _∂ + Δ + (D / S) K≤30, sleeves are rolled into commodity pipes of 426 × 41 × 5800-6200-426 × 60 × 4500-4800 mm in size in pilgrim mills with hoods from µ = 3.44 to 3.52 and a diameter of 29.0%, and cut with saw hot cutting of technological waste - seed ends and pilgrim heads, heat treatment of pipes, etching, repair, ultrasonic inspection and acceptance of pipes of size 426 × 15-20 mm with a tolerance of ± 1.0% in diameter and + 15 / -5.0 in wall %, and pipes with a size of 426 × 21-60 mm with a tolerance in diameter of + 1.25 / -1.0% and on the wall + 20 / -5.0%. 2. The method according to claim 1, characterized in that the rolling of commodity pipes of 426 × 21-60 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 $$m_j=m_{21}+\frac{m_{21}}{{\mu }_i}$$

, where m ₂₁ -15-16 is the feed value of a sleeve with a diameter of 600 mm into the deformation zone of the pilgrim mill during rolling of pipes with a size of 426 × 21 mm in rolls with a caliber of 434 mm; µ _i - the amount of drawing when rolling pipes with a diameter of 426 mm with i - wall thickness.