RU2012149662A - 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-billets of electroslag remelting 470 × in. 290 × 3200 ± 50 and 470 × in. 260 × 3200 ± 50 mm, commodity pipes 299 × 31–40 mm in size are produced from hollow ingot blanks ESRs with dimensions of 500 × ext. 160 × 2100 ± 50 and 500 × ext. 150 × 2100 ± 50 mm, pipes with a size of 299 × 41-60 mm from ingots ESW blanks of 470 × 100 × 1750 ± 50 mm in size. 2. The method according to claim 1, characterized in that the conversion pipes 325 × 15 and 325 × 18 mm are produced from hollow ingots of electroslag remelting, which are grinded and bored into hollow s

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-billets of electroslag remelting 470 × in. 290 × 3200 ± 50 and 470 × in. 260 × 3200 ± 50 mm, commodity pipes 299 × 31–40 mm in size are produced from hollow ingot blanks ESRs with dimensions of 500 × ext. 160 × 2100 ± 50 and 500 × ext. 150 × 2100 ± 50 mm, pipes with a size of 299 × 41-60 mm from ingots ESW 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 , the ingot billets are heated to a temperature of 1180-1200 ° C and rolled on 8-16 '' TPU with pilgrim mills into 325 × 15 × 20300-20700 and 325 × 18 × 17600-18300 mm sized pipes with hoods, respectively, µ = 7.77 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 process waste - seed con hot and cold saws, cutting 325 × 15 mm pipes into three pipes — krat, 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 PP.1 and 2, characterized in that the conversion pipe size 325 × 15 × 6650-6900 mm is rolled on a mill ХПТ 450 into commodity cold-rolled pipes of size 299 × 10 × 9800-10200, 299 × 11 × 9300-9600 , 299 × 12 × 8200-6600 and 299 × 13 × 7600-8000 mm with hoods, respectively, µ = 1.54, µ = 1.47, µ = 1.35 and µ = 1.21, and the conversion pipes are sized 325 × 18 × 8800-9150 mm are rolled into commodity cold-rolled pipes of 299 × 13 × 12700-13200, 299 × 14 × 11400-11900 and 299 × 15 × 10700-11100 mm sizes with hoods, respectively, µ = 1.49, µ = 1.34, and µ = 1.26, heat treatment, dressing, ultrasonic testing and acceptance of pipes with tolerances of diameter ± 1.0% and thickness and no walls + 15 / -5%. 4. The method according to claim 1, characterized in that the commodity pipes with a diameter of 299 mm with wall thicknesses of 16 to 30 mm are produced on TPU 8-16 '' with pilgrim mills from hollow ingots of electroslag remelting, which are turned and bored into hollow ingots - billets with a size of 470 × ext. 290 × 3200 ± 50 and 470 × ext. 260 × 3200 ± 50 mm, are heated to a temperature of 1180-1200 ° C and rolled on 8-16 '' TPU with pilgrim mills into 299 × 16 commodity pipes × 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 feeds of sleeves into the deformation zone m = 17-20 mm, pipes diameter 299 mm with thickness inami walls from 31 to 40 mm are produced from hollow ingots of electroslag remelting, which are turned 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 in a cross-rolling mill in sleeves of 470 × ext. 265 × 3000-3140 and 470 × ext. 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 measuring 299 × 31 × 11400-12000-299 × 40 × 9400-9900 mm s hoods from µ = 4.29 to µ = 3.71, compression in diameter PN 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 ingots-blanks of ESR with a size of 470 × 100 × 1750 ± 50 mm, which are heated to temperature 1160-1170 ° C, stitched in a cross-rolling mill in sleeves of size 470 × ext. 240 × 2150-2280 and 470 × ext. 215 × 2000-2120 mm 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 mills into 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 ru 36.2% and with feeds of sleeves into the deformation zone m = 23-25 mm, they cut off technological waste - seed ends and pilgrim heads with a hot cutting saw, dressing 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 claims 1 to 4, characterized in that the hot-rolled steel tubes on TPU 8-16 '' with pilgrim mills are produced with hoods µ = 7.77 and µ = 6.54, hot-rolled commodity pipes 299 × 16- in size 30 mm with hoods from µ = 6.99 to µ = 4.40, hot-rolled commodity pipes with a size of 299 × 31-40 mm with total hoods from µ _Σ = 6.26 to µ _Σ = 5.08, commodity pipes with a size of 299 × 41-60 mm with total hoods from μ _Σ = 4.62 to μ _Σ = 3.42, and commodity cold-rolled pipes 299 × 10-15 mm in size are produced with total hoods from $${\mu }_{\Sigma }^{\mathrm{one}}=12.33$$

before $${\mu }_{\Sigma }^{\mathrm{one}}=8.5$$

, 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 flashing ingot billets and flashing firmware of 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 claims 2 and 4, characterized in that the rolling of commodity pipes of 299 × 16-30 mm in size and conversion tubes of 325 × 15 and 325 × 18 mm in size on TPU 8-16 '' with piligim mills is made from hollow ingots of blanks with a drawing coefficient µ≥4.4, rolling of commodity pipes 299 × 31-40 mm in size is made from hollow ingots with 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 $$S_{s\left(\mathrm{1,2}\right)}=\frac{k{D}_s\pm \sqrt{{\left(k{D}_s\right)}^2-\mathrm{four}k{\mu }_P{S}_t{\left(D_t-S_t\right)}^{{}_2}}}{2k}+{\Delta }_o+{\Delta }_p$$

, $$S_{s\left(\mathrm{1,2}\right)}=\frac{k{D}_s\pm \sqrt{{\left(k{D}_s\right)}^2-\mathrm{four}k{\mu }_{\Sigma }{S}_t{\left(D_t-S_t\right)}^{{}_2}}}{2k}+{\Delta }_o+{\Delta }_p$$

, where k = 0.98 is a coefficient that takes 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 _t - the diameter of the hot-rolled commodity and conversion pipes, mm; S _t - 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 boring of 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 _np. - the coefficient of extraction during firmware rolling of hollow ingots-billets in a cross-helical rolling mill. 7. The method according to PP.2 and 4, characterized in that after delivery from the furnace before transportation to the pilgrim mill in hollow ingots-blanks of size 500 × vn. 320 × 3200 × ± 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 in size ± 50 and ingot blanks with a size of 470 × 100 × 1750 ± 50 mm, grease of a mass of 300-400 and 400-500 g, respectively, is fed into the central hole before flashing-rolling and flashing them on a cross-helical rolling mill.