CN114000052A - Steel P92 die casting round ingot for high-pressure boiler pipe and smelting process thereof - Google Patents
Steel P92 die casting round ingot for high-pressure boiler pipe and smelting process thereof Download PDFInfo
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- CN114000052A CN114000052A CN202111194759.4A CN202111194759A CN114000052A CN 114000052 A CN114000052 A CN 114000052A CN 202111194759 A CN202111194759 A CN 202111194759A CN 114000052 A CN114000052 A CN 114000052A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 76
- 239000010959 steel Substances 0.000 title claims abstract description 76
- 238000004512 die casting Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000003723 Smelting Methods 0.000 title claims abstract description 16
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 37
- 239000000956 alloy Substances 0.000 claims abstract description 37
- 238000007664 blowing Methods 0.000 claims abstract description 25
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 10
- 229910000604 Ferrochrome Inorganic materials 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 9
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 8
- 229910001309 Ferromolybdenum Inorganic materials 0.000 claims abstract description 6
- 229910000616 Ferromanganese Inorganic materials 0.000 claims abstract description 5
- 229910000592 Ferroniobium Inorganic materials 0.000 claims abstract description 5
- 229910001145 Ferrotungsten Inorganic materials 0.000 claims abstract description 5
- 229910000628 Ferrovanadium Inorganic materials 0.000 claims abstract description 5
- 238000000137 annealing Methods 0.000 claims abstract description 5
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims abstract description 5
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 claims abstract description 5
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 claims abstract description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 38
- 239000007789 gas Substances 0.000 claims description 37
- 229910052786 argon Inorganic materials 0.000 claims description 19
- 238000010079 rubber tapping Methods 0.000 claims description 16
- 238000005070 sampling Methods 0.000 claims description 13
- 238000005266 casting Methods 0.000 claims description 12
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 10
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 239000004571 lime Substances 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 235000007164 Oryza sativa Nutrition 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000010903 husk Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 235000009566 rice Nutrition 0.000 claims description 4
- 229910014458 Ca-Si Inorganic materials 0.000 claims description 3
- 239000005997 Calcium carbide Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 239000011863 silicon-based powder Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 229910001208 Crucible steel Inorganic materials 0.000 abstract description 2
- 238000007872 degassing Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000007670 refining Methods 0.000 abstract description 2
- 239000000155 melt Substances 0.000 abstract 1
- 239000011651 chromium Substances 0.000 description 10
- 230000035515 penetration Effects 0.000 description 5
- 238000009749 continuous casting Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 241000209094 Oryza Species 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000967 As alloy Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a steel P92 die casting round ingot for a high-pressure boiler tube and a smelting process thereof, which adopts the process route of EAF-LF-VD-IC, the raw materials comprise high-quality scrap steel, steel scraps, stub bar steel iron material, micro-carbon ferrochrome, ferromanganese, ferrosilicon, ferromolybdenum, ferrovanadium, Ni plates, ferroniobium, ferroboron and ferrotungsten, an electric furnace melts the steel iron material to obtain primary molten steel, alloy components are adjusted by a refining furnace, VD is turned to degas after the components are proper, the LF is hoisted to adjust the N content after the degasification, and the calculation formula for adjusting the N content by blowing nitrogen is as follows: blowing [ N ] time (min) = (500-550-initial N (vd)) molten steel amount/600, and finally blowing [ N ]: 500-550 ppm, transferring the die to cast steel after the N adjustment is finished, and finally annealing the round billet to obtain a die-cast round ingot with qualified components and no cracks on the surface.
Description
Technical Field
The invention belongs to the technical field of steelmaking, and relates to a steel P92 die casting round ingot for a high-pressure boiler tube, which can solve the problem of surface cracking of a P92 die casting round ingot and realize the purpose of directly penetrating the tube without punching at the center of the P92 die casting round ingot, and a smelting process thereof.
Background
The P92 steel is martensite heat-resistant steel for high-pressure boiler pipes, the Mo content is reduced on the basis of the P91 steel, a certain amount of W content is added, the P92 steel has better hot workability and corrosion resistance, the high-temperature creep rupture strength is very high, the current domestic production adopts continuous casting production, the center of a casting blank has star-shaped cracks, the casting blank cannot be directly used for pipe penetration, and the pipe penetration production can be realized only after the center is punched. Compared with a continuous casting billet, the die-cast steel ingot has the characteristics of full riser feeding, compact solidification structure, excellent core quality, no internal shrinkage cavity, no crack and the like, so that the development of the die-cast round ingot suitable for direct pipe penetration becomes an effective way for solving the use problem of continuous casting P92 pipe penetration, but the die-cast round ingot has the quality problem of easy surface longitudinal crack due to uneven thermal stress release.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the steel P92 die casting round ingot for the high-pressure boiler tube, which solves the problem of surface cracking of the P92 die casting round ingot, opens the production route of the P92 die casting round ingot and realizes the purpose of directly penetrating the tube without punching the center part of the P92 round ingot by optimizing the P92 steel components, adjusting die casting steel, the using temperature of an ingot die and other important process parameters, and the smelting process of the steel.
In order to achieve the purpose, the invention adopts the following technical scheme:
a steel P92 die casting round ingot for a high-pressure boiler tube adopts a process route from EAF to LF to VD to IC, and the steel P92 die casting round ingot for the high-pressure boiler tube comprises the following components in percentage by weight: [C] 0.09-0.12%, 0.10-0.30% of [ Si ], 0.40-0.55% of [ Mn ], less than or equal to 0.015% of [ P ], less than or equal to 0.005% of [ S ], [ 8.60-9.00% of [ Cr ], [ Mo ], 0.45-0.55% of [ Ni ], 0.10-0.25% of [ V ], 0.18-0.22% of [ V ], less than or equal to 0.20% of [ Cu ], 1.55-1.70% of [ W ], 0.002-0.004% of [ B ], 0.045-0.075% of [ Nb ], 0.045-0.070% of [ N ], less than or equal to 0.010% of [ Al ], less than or equal to 0.015% of [ Zr ], [ 0.010% of [ Pb ] and less than or equal to 0.010% of [ Pb ], less than or equal to 0.010% of [ Pb ] and less than or equal to 0.010% of [ Pb < 0.010% of [ B ], [ 010% of [ Bi ], less than or equal to 0.010% of [ B ] and [ Pb < 0.010% of [ B ].
The smelting process of the steel P92 die-cast round ingot for the high-pressure boiler pipe is carried out according to the following process steps;
step 1), adding scrap steel, steel scraps and a stub bar into an EAF furnace, feeding electricity to melt, adding 10-20 Kg/ton of carburant during melting, adding 25-35 Kg/ton of lime to blow oxygen after melting, wherein the oxygen blowing amount reaches 20m3T slag flowing, sampling at more than or equal to 1580 ℃, and controlling tapping [ C ]]≤0.03％，[P]Less than or equal to 0.004 percent, and transferring into an LF furnace after tapping;
step 2), putting an LF in place, connecting an argon gas vent plug, adjusting the argon gas flow by 20-200 Nl/min, adding 10-15 Kg/t of lime, 1-2 Kg/t of calcium carbide, 2-4 Kg/t of carbon powder and ferrosilicon powder, transmitting power for 20min for sampling, adding 2-4 Kg/t of ferrosilicon in batches to adjust the Si content, adding 4-6 Kg/t of metal ferromanganese to adjust the Mn content, adding 110-130 Kg/t of micro carbon ferrochrome to adjust the Cr content, adding 0.6Kg/t of aluminum block to adjust the Al content, adding 1.0-2.5 Kg/t of Ni plate to adjust the Ni content, adding 4-5 Kg/t of ferrovanadium to adjust the V content, adding 7.5-9.5 Kg/t of ferromolybdenum to adjust the Mo content, adding 22-25 Kg/t of ferrotungsten to adjust the W content, adding 0.7-1.2 Kg/t of ferroniobium to adjust the Nb content, adding 0.3-0.5 Kg/t of ferroboron to adjust the B content, adding the alloy in each batch by less than or equal to 3 tons, adjusting the alloy in each batch, then feeding electricity for 15-20 min for sampling, adding 0.5-1.5 Kg/t of Ca-Si powder and 0.5-1.5 Kg/t of aluminum powder during each feeding electricity for deoxidation, controlling [ C ] to be less than or equal to 0.09%, 0.10-0.30% of [ Si ], 0.40-0.55% of [ Mn ], 0.015% or less of [ P ], 0.005% or less of [ S ], 8.60-9.00% of [ Cr ], 0.45-0.55% of [ Mo ], 0.10-0.25% of [ Ni ], 0.18-0.22% of [ V ], 0.20% or less of [ Cu ], 1.55-1.70% of [ W ], 0.004-0.004% of [ B ], 0.015% of [ Nb ], 0.075% of [ Ti ], 0.010-0.0450.01% of [ Zr ], and 0.01-0.010% of [ VD ] at the temperature of [ 1650%;
step 3), after VD is in place, connecting an argon gas permeable plug, adjusting the argon gas flow to be 20-50 Nl/min, measuring the temperature to be 1650-1670 ℃, buckling a VD tank cover, starting a primary pump, starting a secondary pump and a tertiary pump step by step at an interval time of 2-4 min, adjusting the argon gas flow to be 100-150 Nl/min, keeping the vacuum degree to be 0.7mbar for more than or equal to 15min, breaking and lifting the cover, sampling, setting [ H ] to be less than or equal to 1.5ppm, setting [ O ] to be less than or equal to 5ppm, taking a gas sample to detect the content of [ N ], and lifting back to LF to adjust the content of N;
step 4), putting an LF in place, connecting an argon gas vent plug, converting gas into nitrogen, adjusting the flow rate of the nitrogen to be 300Nl/min, blowing 600ppm/min into molten steel according to ton, and calculating N blowing time according to the [ N ] content detected by a VD gas sample and the LF gas [ N ] content of 500-550 ppm, wherein the calculation formula is as follows: blowing [ N ] for (min) (500 to 550 — initial N (vd)) molten steel amount/600, and finally blowing [ N ]: 500-550 ppm, other components meet the conditions that [ C ] is 0.09-0.12%, [ Si ] is 0.10-0.30%, [ Mn ] is 0.40-0.55%, [ P ] is less than or equal to 0.015%, [ S ] is less than or equal to 0.005%, [ Cr ] is 8.60-9.00%, [ Mo ] is 0.45-0.55%, [ Ni ] is 0.10-0.25%, [ V ] is 0.18-0.22%, [ Cu ] is less than or equal to 0.20%, [ W ] is 1.55-1.70%, [ B ] is 0.002-0.004%, [ Nb ] is 0.0450.075-0.010%, [ Ti ] is less than or equal to 0.010%, [ Al ] is 0.015%, [ Zr ] is less than or equal to 0.01%, [ As ] is less than or equal to 0.010% +, and [ Sn ] is less than or equal to 0.010% and [ Pb ] is less than or equal to 0.010% and [ Sn ] is less than or equal to 0.010% and is more than or equal to 0.010% of [ Sn ] via stirring at [ B ] and the temperature of [ 15515 ℃ of [ B ] and the [ B ] is less than or equal to 0.010 + 0.010% of [ Pb < 0.010% of < 0.010 + 0.010% of < Bi < 0.010% of < Bi < 0.010% of < Bi < 0.1550.010% of < Bi < 0.010% of < Bi < 0.010% of < Bi < 0.010% of < 0.1550.010% of < Pb < Bi < 0.010% of < 0.1550.010% of < Bi < Pb < 0.010% of < Bi < 0.1550.1550% of < Pb < 0% of < Pb < Bi < 0% of < Bi < 0% of < B < 0% of < B < 0.010% of < 0% of < B < 0 < B < 0 < 0.1550 < B < 0 < B < 0 < 0.1550 < B;
step 5), cleaning the inner wall of the ingot mold, wherein the using temperature of the ingot mold is 100-150 ℃, the casting temperature is 1550-1560 ℃, die casting protective slag is used, and the heating agent and the carbonized rice husk are added for heat preservation after casting;
step 6), a cooling system: and (5) annealing the round blank after demolding.
In the step 1), the used scrap steel, steel filings and stub bars are all steel materials without oil stains and serious corrosion, the steel tapping control ensures that [ Cu ] is less than or equal to 0.20%, [ Ti ] is less than or equal to 0.002%, [ Zr ] is less than or equal to 0.01%, [ As ] is less than or equal to 0.012%, [ Sn ] is less than or equal to 0.008%, [ Pb ] is less than or equal to 0.010%, [ Sb ] is less than or equal to 0.010%, and [ As ] + [ Sn ] + [ Pb ] + [ Sb ] + [ Bi ] is less than or equal to 0.035%, the tapping temperature is controlled to be more than or equal to 1650 ℃, and 2-4 kg/t of aluminum blocks, 5-10 kg/t of lime and 25-35 kg/t of micro-carbon ferrochrome are added into a steel ladle in the tapping process.
The technical scheme of the invention has the following positive effects: a steel P92 die casting round ingot for high-pressure boiler tube and its smelting process, which adopts EAF-LF-VD-IC process route. The raw materials comprise high-quality steel scraps, scrap heads and other steel materials, and micro-carbon ferrochrome, ferromanganese, ferrosilicon, ferromolybdenum, ferrovanadium, Ni plates, ferrocolumbium, ferroboron and ferrotungsten. The steel and iron materials are melted by an electric furnace to obtain primary molten steel with [ C ] less than or equal to 0.03%, [ P ] less than or equal to 0.004%, [ Cu ] less than or equal to 0.20%, [ Ti ] less than or equal to 0.002%, [ Zr ] less than or equal to 0.01%, [ As ] less than or equal to 0.012%, [ Sn ] less than or equal to 0.008%, [ Pb ] less than or equal to 0.010%, [ Sb ] less than or equal to 0.010%, [ Bi ] less than or equal to 0.010%, [ As ] + [ Sn ] + [ Pb ] + [ Sb ] + [ Bi ] less than or equal to 0.035%, primary molten steel after rotary refining is subjected to slagging, deoxidation, desulfurization, alloy element adjustment and temperature adjustment to obtain primary molten steel with [ C ] less than or equal to 0.09%, [ Si ] 0.10-0.30%, [ Mn ] 0.40-0.55%, [ P ] less than or equal to 0.015%, [ S ] less than or equal to 0.015%, 0.8%, Ni [ 0.01% and 0.30%, 0.30% of [ Ni ] less than or equal to 0.30%, 0.30% of [ Mn ], 0.55% of [ Ni [ Cu ] less than or equal to 0.30%, 0.20% of [ Ni [ 0.20% of [ 0.004%, 0.30%, 0.20% of [ Cu ], [ 0.30%, 0.20% and 0.30% of [ Ni [ 0.30% of [ 0.004%, 0.30% of [ 0.30%, 0.20% of [ Cu ], [ 1.30% of [ Ni ] less than or equal to 0.015% of [ Cu ],0.25%, degassing molten steel with Zr less than or equal to 0.01% by VD, removing gas in the molten steel, hoisting back LF to adjust N content, and adjusting the N content by nitrogen blowing and gas adjustment according to the calculation formula: blowing [ N ] for (min) (500 to 550 — initial N (vd)) molten steel amount/600, and finally blowing [ N ]: 500-550 ppm, 0.09-0.12% of other components according to the following formula [ C ], [ Si ], [ 0.10-0.30%, [ Mn ], [ P ] less than or equal to 0.015%, [ S ] less than or equal to 0.005%, [ Cr ], [ 0.60-9.00%, [ Mo ], [ 0.45-0.55%, [ Ni ], [ 0.10-0.25%, [ V ] 0.18-0.22%, [ Cu ] less than or equal to 0.20%, [ W ] 1.55-1.70%, [ B ] 0.002-0.004%, [ Nb ] 0.0450.075% less than or equal to 0.010%, [ Al ] 0.015%, [ Zr ] less than or equal to 0.010%, [ As ] less than or [ B ] less than or equal to 0.010% of [ B ] less than or equal to 0.010% of [ Nb ], and [ B ] less than or equal to 0.010% of [ B ] less than or equal to 0.010% of the alloy, and the alloy is cast into a mold, and the alloy, the alloy is cast into a heat-0.010% of a heat-preserving ingot, and the alloy is used As alloy, and the alloy is cast into a heat-0.010% of the alloy, and the alloy is cast into a heat-0.010% of the alloy, the alloy is less than or the alloy, the alloy is used in the alloy, the alloy is less than or the alloy, the alloy is used in the alloy, the alloy is used for the alloy, the alloy is used for casting the alloy, the alloy is used for casting is less than or the alloy, the alloy is less than or the alloy, the alloy is less than or, and annealing treatment is carried out, and finally the die casting round billet with qualified components and surface quality is obtained.
The smelting process is suitable for producing P92 steel by die casting and continuous casting, and has the following advantages:
(1) the problem of surface cracking of the die casting round billet is solved;
(2) the molten steel of the die casting round billet with a riser promotes feeding, the core quality is better, the star-shaped crack at the center of the steel ingot can meet the requirement of direct pipe penetration, and the outturn percentage is improved by about 6 percent.
Detailed Description
A steel P92 die casting round ingot for a high-pressure boiler tube adopts an EAF-LF-VD-IC process route, and the P92 comprises the following components: [C] 0.09-0.12%, 0.10-0.30% of [ Si ], 0.40-0.55% of [ Mn ], less than or equal to 0.015% of [ P ], less than or equal to 0.005% of [ S ], [ 8.60-9.00% of [ Cr ], [ Mo ] 0.45-0.55%, 0.10-0.25% of [ Ni ], [ V ] 0.18-0.22%, less than or equal to 0.20% of [ Cu ], [ W ] 1.55-1.70%, 0.002-0.004% of [ B ], [ 0.045-0.075% of [ Nb ], [ N ] 0.045-0.070%, less than or equal to 0.010% of [ Al ], [ 015 ] 0.010% of [ Pb ] and less than or equal to 0.010% of [ Pb ] 0.010% of [ 010% of [ B ], [ 010% of [ Pb ] and less than or equal to 0.010% of [ B ] Bi ] As [ 010% of [ B ] 0.010% of [ Pb ] and less than or equal to 0.010% of [ 010% of [ B ] are detected by [ Pb < 2,
a smelting process of a steel P92 die-casting round ingot for a high-pressure boiler tube comprises the following steps:
step 1), adding steel materials such as 320-360 Kg/t of scrap steel, 540-650 Kg/t of steel scrap, 200-240 Kg/t of stub bar and the like into an EAF furnace, feeding electricity to melt, adding 10-20 Kg/t of carburant during melting, adding 25-35 Kg/t of lime into the furnace after melting, and blowing oxygen until the oxygen blowing amount reaches 20m3T slag flowing, sampling at more than or equal to 1580 ℃, and controlling tapping [ C ]]≤0.03％，[P]≤0.004％，[Cu]≤0.20％，[Ti]≤0.002％，[Zr]≤0.01％，[As]≤0.012％、[Sn]≤0.008％、[Pb]≤0.010％、[Sb]≤0.010％、[Bi]≤0.010％，[As]+[Sn]+[Pb]+[Sb]+[Bi]And controlling the tapping temperature to be more than or equal to 0.035%, adding 2-4 kg/t of aluminum blocks, 5-10 kg/t of lime and 25-35 kg/t of micro-carbon ferrochrome into the steel ladle in the tapping process, and transferring into an LF furnace after tapping.
Step 2), putting an LF in place, connecting an argon gas vent plug, adjusting the argon gas flow by 20-200 Nl/min, adding 10-15 Kg/t of lime, 1-2 Kg/t of calcium carbide, 2-4 Kg/t of carbon powder and ferrosilicon powder, transmitting power for 20min for sampling, adding 2-4 Kg/t of ferrosilicon in batches to adjust the Si content, adding 4-6 Kg/t of metal ferromanganese to adjust the Mn content, adding 110-130 Kg/t of micro carbon ferrochrome to adjust the Cr content, adding 0.6Kg/t of aluminum block to adjust the Al content, adding 1.0-2.5 Kg/t of Ni plate to adjust the Ni content, adding 4-5 Kg/t of ferrovanadium to adjust the V content, adding 7.5-9.5 Kg/t of ferromolybdenum to adjust the Mo content, adding 22-25 Kg/t of ferrotungsten to adjust the W content, adding 0.7-1.2 Kg/t of ferroniobium to adjust the Nb content, adding 0.3-0.5 Kg/t of ferroboron to adjust the B content, the alloy amount is less than or equal to 3 tons per batch, the alloy is adjusted per batch and then is fed for 15-20 min for sampling, 0.5-1.5 Kg/t of Ca-Si powder and 0.5-1.5 Kg/t of aluminum powder are added during each feeding period for deoxidation, 0.10-0.30% of [ C ], 0.40-0.55% of [ Si ], 0.015% or less of [ P ], 0.005% or less of [ S ], 8.60-9.00% of [ Cr ], 0.45-0.55% of [ Mo ], 0.10-0.25% of [ Ni ], 0.18-0.22% of [ V ], 0.20% or less of [ Cu ], 1.55-1.70% of [ W ], 0.004-0.004%, 0.015% of [ B ], 0.075% or less of [ Nb ], 0.01-0.0450.010% of [ Zr ], and 0.01-0.010% of Al is added into the alloy for deoxidation.
And 3) after the VD is in place, connecting an argon gas permeable plug, adjusting the argon gas flow by 20-50 Nl/min, measuring the temperature by 1650-1670 ℃, buckling a VD tank cover, starting a primary pump, starting a secondary pump and a tertiary pump step by step at intervals of 2-4 min, adjusting the argon gas flow by 100-150 Nl/min when the vacuum degree reaches 0.7mbar, keeping the vacuum degree for more than or equal to 15min at 0.7mbar, breaking and lifting the cover, sampling, determining [ H ] to be less than or equal to 1.5ppm, determining [ O ] to be less than or equal to 5ppm, taking a gas sample to detect the content of [ N ], and lifting back to LF to adjust the content of N.
Step 4), putting an LF in place, connecting an argon gas vent plug, converting gas into nitrogen, adjusting the flow rate of the nitrogen to be 300Nl/min, blowing 600ppm/min into molten steel according to ton, and calculating N blowing time according to the [ N ] content detected by a VD gas sample and the LF gas [ N ] content of 500-550 ppm, wherein the calculation formula is as follows: blowing [ N ] for (min) (500 to 550 — initial N (vd)) molten steel amount/600, and finally blowing [ N ]: 500-550 ppm, other components satisfying [ C ] 0.09-0.12%, [ Si ] 0.10-0.30%, [ Mn ] 0.40-0.55%, [ P ] less than or equal to 0.015%, [ S ] less than or equal to 0.005%, [ Cr ] 8.60-9.00%, [ Mo ] 0.45-0.55%, [ Ni ] 0.10-0.25%, [ V ] 0.18-0.22%, [ Cu ] less than or equal to 0.20%, [ W ] 1.55-1.70%, [ B ] 0.002-0.004%, [ Nb ] 0.0450.075%, [ Ti ] less than or equal to 0.010%, [ Al ] 0.015%, [ Zr ] 0.01%, [ As ] less than or equal to 0.010%, [ Sb ] less than or equal to 0.010%, [ As ] 0.010%, [ Pb ] less than or [ 3.010% less than or [ Pb ] less than or equal to 0.010% and [ Sn ] less than or equal to 0.010% of [ B ] and [ B ] less than or equal to 0.010% of [ B ] less than or equal to 0.010% of [ B ] and [ B ] less than or equal to 0.010% of [ Pb < 0.010% of [ B < 0.010% of < Pb < 0.010% of < B < 0.010% of < 0.15515% of < B < 0 < 0.0.0 < B < 0 < B < 0 < B < 0 < B < 0 < B < 0 < B < 0 < B < 0 < B < 0 < B < 0 < B < 0 < B < 0 < B <.
And 5) cleaning the inner wall of the ingot mold, wherein the using temperature of the ingot mold is 100-150 ℃, the casting temperature is 1550-1560 ℃, die casting protective slag is used, and the heating agent and the carbonized rice husk are added for heat preservation after casting.
Step 6), a cooling system: and (5) annealing the round blank after demolding.
Four-furnace smelting is carried out according to the smelting process of the embodiment, the chemical component content of the product obtained by the four-furnace smelting meets the target requirement in table 1, and no crack appears on the surface of the round billet:
table 1 chemical composition m%
The smelting process is suitable for smelting the steel P92 round billet for producing the high-pressure pipe by die casting.
In the step 1), the used steel materials such As scrap steel, steel filings and stub bars are free of oil stains and serious corrosion, and the steel materials such As [ Cu ] is less than or equal to 0.20%, [ Ti ] is less than or equal to 0.002%, [ Zr ] is less than or equal to 0.01%, [ As ] is less than or equal to 0.012%, [ Sn ] is less than or equal to 0.008%, [ Pb ] is less than or equal to 0.010%, [ Sb ] is less than or equal to 0.010%, [ Bi ] is less than or equal to 0.010%, and [ As ] + [ Sn ] + [ Pb ] + [ Sb ] + [ Bi ] is less than or equal to 0.035%, the tapping temperature is controlled to be more than or equal to 1650 ℃, and 2-4 kg/t of aluminum blocks, 5-10 kg/t of lime and 25-35 kg/t of micro-carbon ferrochrome are added into the steel ladle in the tapping process.
In the step 2), alloy with micro-carbon, high chromium, ferromolybdenum and the like is used, the contents of [ P ] and [ Ti ] in the alloy are analyzed before use, and the final [ P ] of the molten steel is controlled to be less than or equal to 0.015 percent and the final [ Ti ] of the molten steel is controlled to be less than or equal to 0.010 percent.
In step 3), the maintenance time is more than or equal to 15min under 0.7mbar, the air is broken, the cover is lifted, the sampling is carried out, the fixed [ H ] is less than or equal to 1.5ppm, the fixed [ O ] is less than or equal to 5ppm, the gas sample is taken to detect the content of [ N ], and the LF is hung back to adjust the content of N.
In the step 4), an LF is put in place, an argon gas vent plug is connected, gas is converted into nitrogen, the nitrogen flow is adjusted to be 300Nl/min, 600ppm/min is blown into per ton of molten steel, and the N blowing time is calculated according to the [ N ] content detected by a VD gas sample and the [ N ] content of the LF gas is 500-550 ppm, wherein the calculation formula is as follows: blowing [ N ] for (min) (500 to 550 — initial N (vd)) molten steel amount/600, and finally blowing [ N ]: 500-550 ppm, the weak stirring time is more than or equal to 15min, and the temperature is 1553-1563 ℃ for rotating die casting steel.
In the step 5), the inner wall of the ingot mould is cleaned, the using temperature of the ingot mould is 100-150 ℃, the casting temperature is 1550-1560 ℃, die casting protective slag is used, and the heating agent and the carbonized rice husk are added after casting.
In step 6), the round billet is annealed after demolding.
Claims (3)
1. A high pressure boiler pipe is with steel P92 die casting circle spindle, its characterized in that: adopting the process route of EAF-LF-VD-IC, the components of the steel P92 die casting round ingot for the high-pressure boiler tube are configured according to the weight percentage as follows: [C] 0.09-0.12%, 0.10-0.30% of [ Si ], 0.40-0.55% of [ Mn ], less than or equal to 0.015% of [ P ], less than or equal to 0.005% of [ S ], [ 8.60-9.00% of [ Cr ], [ Mo ], 0.45-0.55% of [ Ni ], 0.10-0.25% of [ V ], 0.18-0.22% of [ V ], less than or equal to 0.20% of [ Cu ], 1.55-1.70% of [ W ], 0.002-0.004% of [ B ], 0.045-0.075% of [ Nb ], 0.045-0.070% of [ N ], less than or equal to 0.010% of [ Al ], less than or equal to 0.015% of [ Zr ], [ 0.010% of [ Pb ] and less than or equal to 0.010% of [ Pb ], less than or equal to 0.010% of [ Pb ] and less than or equal to 0.010% of [ Pb < 0.010% of [ B ], [ 010% of [ Bi ], less than or equal to 0.010% of [ B ] and [ Pb < 0.010% of [ B ].
2. A process for smelting a steel P92 die-cast round ingot for a high-pressure boiler pipe according to claim 1, wherein the process comprises the following steps: the method comprises the following steps of;
step 1), adding scrap steel, steel scraps and a stub bar into an EAF furnace, feeding electricity to melt, adding 10-20 Kg/ton of carburant during melting, adding 25-35 Kg/ton of lime to blow oxygen after melting, wherein the oxygen blowing amount reaches 20m3T slag flowing, sampling at more than or equal to 1580 ℃, and controlling tapping [ C ]]≤0.03%，[P]Less than or equal to 0.004 percent, and transferring into an LF furnace after tapping;
step 2), putting an LF in place, connecting an argon gas vent plug, adjusting the argon gas flow by 20-200 Nl/min, adding 10-15 Kg/t of lime, 1-2 Kg/t of calcium carbide, 2-4 Kg/t of carbon powder and ferrosilicon powder, transmitting power for 20min for sampling, adding 2-4 Kg/t of ferrosilicon in batches to adjust the Si content, adding 4-6 Kg/t of metal ferromanganese to adjust the Mn content, adding 110-130 Kg/t of micro carbon ferrochrome to adjust the Cr content, adding 0.6Kg/t of aluminum block to adjust the Al content, adding 1.0-2.5 Kg/t of Ni plate to adjust the Ni content, adding 4-5 Kg/t of ferrovanadium to adjust the V content, adding 7.5-9.5 Kg/t of ferromolybdenum to adjust the Mo content, adding 22-25 Kg/t of ferrotungsten to adjust the W content, adding 0.7-1.2 Kg/t of ferroniobium to adjust the Nb content, adding 0.3-0.5 Kg/t of ferroboron to adjust the B content, adding the alloy in each batch by less than or equal to 3 tons, adjusting the alloy in each batch, then feeding electricity for 15-20 min for sampling, adding 0.5-1.5 Kg/t of Ca-Si powder and 0.5-1.5 Kg/t of aluminum powder during each feeding electricity for deoxidation, controlling [ C ] to be less than or equal to 0.09%, 0.10-0.30% of [ Si ], 0.40-0.55% of [ Mn ], 0.015% or less of [ P ], 0.005% or less of [ S ], 8.60-9.00% of [ Cr ], 0.45-0.55% of [ Mo ], 0.10-0.25% of [ Ni ], 0.18-0.22% of [ V ], 0.20% or less of [ Cu ], 1.55-1.70% of [ W ], 0.004-0.004% of [ B ], 0.015% of [ Nb ], 0.075% of [ Ti ], 0.010-0.0450.01% of [ Zr ], and 0.01-0.010% of [ VD ] at the temperature of [ 1650%;
step 3), after VD is in place, connecting an argon gas permeable plug, adjusting the argon gas flow to be 20-50 Nl/min, measuring the temperature to be 1650-1670 ℃, buckling a VD tank cover, starting a primary pump, starting a secondary pump and a tertiary pump step by step at an interval time of 2-4 min, adjusting the argon gas flow to be 100-150 Nl/min, keeping the vacuum degree to be 0.7mbar for more than or equal to 15min, breaking and lifting the cover, sampling, setting [ H ] to be less than or equal to 1.5ppm, setting [ O ] to be less than or equal to 5ppm, taking a gas sample to detect the content of [ N ], and lifting back to LF to adjust the content of N;
step 4), putting an LF in place, connecting an argon gas vent plug, converting gas into nitrogen, adjusting the flow rate of the nitrogen to be 300Nl/min, blowing 600ppm/min into molten steel according to ton, and calculating N blowing time according to the [ N ] content detected by a VD gas sample and the LF gas [ N ] content of 500-550 ppm, wherein the calculation formula is as follows: blowing [ N ] time (min) = (500-550-initial N (vd)) molten steel amount/600, and finally blowing [ N ]: 500-550 ppm, other components meet the conditions that [ C ] is 0.09-0.12%, [ Si ] is 0.10-0.30%, [ Mn ] is 0.40-0.55%, [ P ] is less than or equal to 0.015%, [ S ] is less than or equal to 0.005%, [ Cr ] is 8.60-9.00%, [ Mo ] is 0.45-0.55%, [ Ni ] is 0.10-0.25%, [ V ] is 0.18-0.22%, [ Cu ] is less than or equal to 0.20%, [ W ] is 1.55-1.70%, [ B ] is 0.002-0.004%, [ Nb ] is 0.0450.075-0.010%, [ Ti ] is less than or equal to 0.010%, [ Al ] is 0.015%, [ Zr ] is less than or equal to 0.01%, [ As ] is less than or equal to 0.010% +, and [ Sn ] is less than or equal to 0.010% and [ Pb ] is less than or equal to 0.010% and [ Sn ] is less than or equal to 0.010% and is more than or equal to 0.010% of [ Sn ] via stirring at [ B ] and the temperature of [ 15515 ℃ of [ B ] and the [ B ] is less than or equal to 0.010 + 0.010% of [ Pb < 0.010% of < 0.010 + 0.010% of < Bi < 0.010% of < Bi < 0.010% of < Bi < 0.1550.010% of < Bi < 0.010% of < Bi < 0.010% of < Bi < 0.010% of < 0.1550.010% of < Pb < Bi < 0.010% of < 0.1550.010% of < Bi < Pb < 0.010% of < Bi < 0.1550.1550% of < Pb < 0% of < Pb < Bi < 0% of < Bi < 0% of < B < 0% of < B < 0.010% of < 0% of < B < 0 < B < 0 < 0.1550 < B < 0 < B < 0 < 0.1550 < B;
step 5), cleaning the inner wall of the ingot mold, wherein the using temperature of the ingot mold is 100-150 ℃, the casting temperature is 1550-1560 ℃, die casting protective slag is used, and the heating agent and the carbonized rice husk are added for heat preservation after casting;
step 6), a cooling system: and (5) annealing the round blank after demolding.
3. The process of smelting a steel P92 die-cast round ingot for a high-pressure boiler pipe according to claim 2, wherein the steel comprises the following steps: in the step 1), the used scrap steel, steel filings and stub bars are all steel materials without oil stains and serious corrosion, the steel tapping control ensures that [ Cu ] is less than or equal to 0.20%, [ Ti ] is less than or equal to 0.002%, [ Zr ] is less than or equal to 0.01%, [ As ] is less than or equal to 0.012%, [ Sn ] is less than or equal to 0.008%, [ Pb ] is less than or equal to 0.010%, [ Sb ] is less than or equal to 0.010%, and [ As ] + [ Sn ] + [ Pb ] + [ Sb ] + [ Bi ] is less than or equal to 0.035%, the tapping temperature is controlled to be more than or equal to 1650 ℃, and 2-4 kg/t of aluminum blocks, 5-10 kg/t of lime and 25-35 kg/t of micro-carbon ferrochrome are added into a steel ladle in the tapping process.
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| CN114606428A (en) * | 2022-02-20 | 2022-06-10 | 山西太钢不锈钢股份有限公司 | Method for refining, reducing and smelting low-silicon low-aluminum high-pressure boiler tube blank P91 |
| CN115522115A (en) * | 2022-03-17 | 2022-12-27 | 河南中原特钢装备制造有限公司 | Process for smelting P92 steel for ultra-supercritical high-pressure boiler by using argon-oxygen furnace |
| CN115216686A (en) * | 2022-06-10 | 2022-10-21 | 江阴兴澄特种钢铁有限公司 | Manufacturing method of P92 steel continuous casting round billet for extra-large-specification high-temperature service environment |
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