RU2013135957A - METHOD FOR PRODUCING SEAMLESS PIPES OF 299 × 10-60 mm SIZE FOR STEAM BOILERS, STEAM PIPELINES, AND COLLECTORS OF UNITS WITH HIGH AND SUPERCRITICAL STEAM PARAMETERS FROM STEEL 10H9MFB-SH STEEL - Google Patents

Abstract

1. Method for the production of seamless pipes 299 × 10-60 mm in size for steam boilers, steam pipelines and manifolds of plants with high and supercritical parameters of steam from steel grade 10X9MFB-Sh, including the smelting of ingots with their subsequent forging into forgings with a cast iron ≥ 2.5 or electroslag ingots casting, machining — turning of forgings and ingots of ESR into blanks and ingots-blanks of size 470 × 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 about the ductility temperature, flashing them in a cross-helical rolling mill into sleeves, rolling the sleeves on pilgrim mills into commodity pipes 299 × 16-60 mm in size and conversion tubes 316 × 27-32 mm in size, dressing, heat treatment, turning machining and boring of conversion pipes into commercial ones with a size of 299 × 10-15 mm, ultrasonic testing, acceptance of pipes with a diameter tolerance of + 1.25 / -1.0% and wall thickness + 20 / -5.0%, characterized in that the commodity pipes with a size of 299 × 10-15 mm are produced at the KhPT 450 mill from hot-rolled steel tubes of 325 × 15 and 325 × 1 sizes 8 mm, commodity pipes 299 × 16-30 mm in size are produced at 8-16 "TPU with pilgrim mills from hollow ingots-blanks of electroslag remelting 470 × in. 290 × 3200 ± 50 and 470 × in. 260 × 3200 ± 50 mm in size , commodity pipes with a size of 299 × 31-40 mm are produced from hollow ingots-blanks of ESR with a size of 500 × ext. 160 × 2100 ± 50 and 500 × ext. 150 × 2100 ± 50 mm, pipes with a size of 299 × 41-60 mm from ingots - ESR blanks measuring 470 × 100 × 1750 ± 50 mm. 2. The method according to claim 1, characterized in that the conversion pipes of 325 × 15 and 325 × 18 mm are produced from hollow ingots of electroslag remelting, which are grinded and bored into hollow layers

Claims (7)

1. Method for the production of seamless pipes 299 × 10-60 mm in size for steam boilers, steam pipelines and manifolds of plants with high and supercritical parameters of steam from steel grade 10X9MFB-Sh, including the smelting of ingots with their subsequent forging into forgings with a cast iron ≥ 2.5 or electroslag ingots casting, machining — turning of forgings and ingots of ESR into blanks and ingots-blanks of size 470 × 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 about the ductility temperature, flashing them in a cross-helical rolling mill into sleeves, rolling the sleeves on pilgrim mills into commodity pipes 299 × 16-60 mm in size and conversion tubes 316 × 27-32 mm in size, dressing, heat treatment, turning machining and boring of conversion pipes into commercial ones with a size of 299 × 10-15 mm, ultrasonic testing, acceptance of pipes with a diameter tolerance of + 1.25 / -1.0% and wall thickness + 20 / -5.0%, characterized in that the commodity pipes with a size of 299 × 10-15 mm are produced at the KhPT 450 mill from hot-rolled steel tubes of 325 × 15 and 325 × 1 sizes 8 mm, commodity pipes 299 × 16-30 mm in size are produced at 8-16 "TPU with pilgrim mills from hollow ingots-blanks of electroslag remelting 470 × in. 290 × 3200 ± 50 and 470 × in. 260 × 3200 ± 50 mm in size , commodity pipes with a size of 299 × 31-40 mm are produced from hollow ingots-blanks of ESR with a size of 500 × ext. 160 × 2100 ± 50 and 500 × ext. 150 × 2100 ± 50 mm, pipes with a size of 299 × 41-60 mm from ingots - ESR blanks measuring 470 × 100 × 1750 ± 50 mm. 2. The method according to claim 1, characterized in that the conversion pipes of 325 × 15 and 325 × 18 mm are produced from hollow ingots of electroslag remelting, which are grinded and bored into hollow ingots-blanks with a size of 500 × ext. 320 × 3200 ± 50 mm , ingot billets are heated to a temperature of 1180-1200 ° C and rolled on 8-16 "TPU with pilgrim mills into 325 × 15 × 21500-22300 and 325 × 18 × 17600-18300 mm pipe converters with hoods, respectively, µ = 7.78 and µ = 6.54, compression in diameter of 36.2% and with feeds of sleeves into the deformation zone m = 15-18 mm, a piece of technological waste - seed seed is produced s and pilgrim heads with a hot cutting saw, cutting pipes 325 × 15 mm in size into three pipes, and 325 × 18 mm pipes into two pipes of equal length, straightening on a six-roll straightening machine, heat treatment, repair, if necessary, and accept with a diameter tolerance of + 1.25 / -1.0 and a wall thickness of ± 12.5%. 3. The method according to claim 1, characterized in that the conversion pipe size 325 × 15 × 7170-7430 mm is rolled at the KhPT 450 mill into commodity cold-rolled pipes 299 × 10 × 11100-11500, 299 × 11 × 10150-10500, 299 × 12 × 9300-9600 and 299 × 13 × 8600-8900 mm with hoods, respectively, µ = 1.61, µ = 1.47, µ = 1.35 and µ = 1.25, and the conversion pipes are 325 × 18 × 8800-9150 mm are rolled into commodity cold-rolled pipes of 299 × 13 × 12700-13200, 299 × 14 × 11800-12300 and 299 × 15 × 11000-11500 mm sizes with hoods, respectively, µ = 1.49, µ = 1 , 39, µ = 1.51 and µ = 1.30, perform heat treatment, dressing, ultrasonic inspection and acceptance of pipes with tolerances in diameter of ± 1.0% and then wall thickness + 15 / -5%. 4. The method according to claim 1, characterized in that the commodity pipes with a diameter of 299 mm with wall thicknesses from 16 to 30 mm are produced on TPU 8-16 "with pilgrim mills from hollow ingots of electroslag remelting, which are grinded and bored into hollow ingots size 470 × ext. 290 × 3200 ± 50 and 470 × ext. 260 × 3200 ± 50 mm, heated to a temperature of 1180-1200 ° C and rolled on 8-16 "TPU with pilgrim mills into commodity pipes of 299 × 16 × 19000 -19700-299 × 30 × 12300-12800 mm with hoods from µ = 6.99 to µ = 4.40, compression in diameter of 36.2% and with feed sleeves into the deformation zone m = 17-20 mm, pipes with a diameter of 299 mm with thickness walls from 31 to 40 mm are produced from hollow ingots of electroslag remelting, which are grinded and bored into hollow ingots-blanks of size 500 × vn. 160 × 2100 ± 50 and 500 × vn. 150 × 2100 ± 50 mm, heated to a temperature of 1160- 1180 ° C, stitched-rolled out in a cross-helical mill into sleeves of 470 × ext. 265 × 3000-3140 and 470hvn. 240 × 2800-2950 mm on mandrels 250 and 225 mm with hoods µ = 1.46 and µ = 1.37, with a diameter of Δ = 6.0%, which are rolled at 8-16 "TPU with pilgrim mills into commodity pipes 299 × 31 × 11400-12000-299 × 40 × 9400-9900 mm in size with hoods from µ = 4.29 to µ = 3.71, compression in diameter 36.2% and with feeds of sleeves into the deformation zone m = 19-23 mm, pipes with a diameter of 299 mm and wall thicknesses from 41 to 60 mm are rolled from ESR ingots-blanks of 470 × 100 × 1750 ± 50 mm in size, which are heated to a temperature 1160-1170 ° C, flashed in a cross-screw mill in sleeves of 470 × in. 240 × 2150-2280 and 470 × in. 215 × 2000-2120 mm in sizes on mandrels with a diameter of 225 and 190 mm with hoods µ = 1.27 and µ = 1.18, with a diameter of Δ = 0, size in size, the sleeves are rolled on an 8-16 "PTU with pilgrim mill in commodity pipes measuring 299 × 41 × 6900-7400-299 × 60 × 5000-5350 mm with hoods from µ = 3.64 to µ = 2.90, compression in diameter at 36.2% and with feeds of sleeves into the deformation zone m = 23–25 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, etching, repair, ultrasonic inspection and acceptance pipes with a tolerance in diameter of + 1.25 / -1.0% and wall thickness + 20 / -5.0%. 5. The method according to claim 1 or 4, characterized in that the hot rolled hot-rolled tubes of 325 × 15 and 325 × 18 mm are produced on 8-16 "TPU with pilgrim mills with hoods µ = 7.78 and µ = 6.54, hot-rolled commodity pipes 299 × 16-30 mm in size with hoods from µ = 6.99 to µ = 4.40, hot-rolled commodity pipes in size 299 × 31–40 mm with total hoods from µ _Σ = 6.26 to µ _Σ = 5 , 08, commodity pipes 299 × 41-60 mm in size with total hoods from μ _Σ = 4.62 to μ _Σ = 3.42, and cold-rolled commodity pipes 299 × 10-15 mm in size are produced with total hoods from μ ¹ _Σ = 12.33 to ¹ μ _Σ = 8,5, smaller values of which include tsya for pipes with smaller ratios D / S, and are determined from expressions µ _Σ = µ _ave µ _p , µ ¹ _Σ = µ _Σ µ _x , where µ _ave. - hood when piercing ingot billets and piercing-rolling hollow ingot billets in a cross-helical rolling mill into sleeves; 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. 6. The method according to claim 2, characterized in that the rolling of commodity pipes of size 299 × 16-30 mm and conversion tubes of 325 × 15 and 325 × 18 mm in TPU 8-16 "with piligim mills is made from hollow ingots with drawing coefficient µ≥4.4, rolling of commodity pipes 299 × 31-40 mm in size is made from hollow ingots-blanks with a total drawing coefficient µ _Σ ≥5.0, and the wall thicknesses of hollow ingots during casting are determined, respectively, from the expressions $$S_{s(\mathrm{one},2)}=\frac{k{D}_s\pm \sqrt{{(k{D}_s)}^2-\mathrm{four}k{\mu }_n{S}_m{(D_m-S_m)}^2}}{2k}+{\Delta }_o+{\Delta }_p$$

, $$S_{s(\mathrm{one},2)}=\frac{k{D}_s\pm \sqrt{{(k{D}_s)}^2-\mathrm{four}k{\mu }_{\Sigma }{S}_m{(D_m-S_m)}^2}}{2k}+{\Delta }_o+{\Delta }_p$$

, where k = 0.98 - coefficient taking into account the value of the fume when heating the metal in a methodical furnace; D _s - the outer diameter of the hollow ingot blanks, mm; D _m - the diameter of the hot-rolled commodity and conversion pipes, mm; S _m - wall thicknesses of hot-rolled commodity and conversion pipes, mm; µ _p ≥4.4 is the minimum drawing coefficient when rolling hot-rolled commodity pipes on a pilgrim mill from hollow ingots; Δ _o - allowance for turning hollow ingots into hollow ingots-blanks, mm; Δ _p - allowance for hollow ingots into hollow ingots-blanks, mm µ _Σ = µ _ave µ _p , where µ _Σ ≥5.0 is the minimum drawing coefficient when rolling hot-rolled commodity pipes on a pilgrim mill from hollow ingots-billets with piercing-rolling them in a cross-helical rolling mill; µ _ave. is the drawing coefficient for flashing-rolling of hollow ingots-blanks in a cross-helical rolling mill. 7. The method according to claim 2 or 4, characterized in that after delivery from the furnace before transportation to the pilgrim mill in hollow ingots-blanks of size 500 × vn. 320 × 3200x ± 50, 470 × vn. 290 × 3200 ± 50 and 470 × ext. 260 × 3200 ± 50 mm serves lubricant in the form of a mixture of graphite with sodium chloride (50/50) weighing 300-500 g, and in hollow ingots-blanks of 500 × 160 × 2100 ± 50, 500 × 150 × 2100 ± 50 and ingot blanks with a size of 470 × 100 × 1750 ± 50 mm, a grease of mass, respectively, 300-400 and 400-500 g is fed into the central hole before flashing-rolling and flashing them on a cross-helical rolling mill.