CN114032434B - Smelting of high corrosion resistant N08120 material and production process of large-caliber seamless pipe - Google Patents
Smelting of high corrosion resistant N08120 material and production process of large-caliber seamless pipe Download PDFInfo
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- 238000003723 Smelting Methods 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 230000007797 corrosion Effects 0.000 title claims abstract description 11
- 238000005260 corrosion Methods 0.000 title claims abstract description 11
- 238000005242 forging Methods 0.000 claims abstract description 40
- 239000000956 alloy Substances 0.000 claims abstract description 34
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 34
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000002844 melting Methods 0.000 claims abstract description 19
- 230000008018 melting Effects 0.000 claims abstract description 19
- 230000006698 induction Effects 0.000 claims abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000007670 refining Methods 0.000 claims abstract description 12
- 238000005098 hot rolling Methods 0.000 claims abstract description 9
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000010622 cold drawing Methods 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims abstract description 6
- 238000005097 cold rolling Methods 0.000 claims abstract description 5
- 238000007689 inspection Methods 0.000 claims abstract description 4
- 238000004806 packaging method and process Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 12
- 230000007547 defect Effects 0.000 claims description 12
- 239000011651 chromium Substances 0.000 claims description 11
- 239000010955 niobium Substances 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 229910052758 niobium Inorganic materials 0.000 claims description 7
- 239000010936 titanium Substances 0.000 claims description 7
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000011572 manganese Substances 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 6
- 229910052721 tungsten Inorganic materials 0.000 claims description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 239000011733 molybdenum Substances 0.000 claims description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- 239000010937 tungsten Substances 0.000 claims description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 3
- 229910018505 Ni—Mg Inorganic materials 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000010485 coping Effects 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000002950 deficient Effects 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000010941 cobalt Substances 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 10
- 239000007789 gas Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 238000009849 vacuum degassing Methods 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
-
- 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
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a smelting process of a high corrosion resistant N08120 material and a production process of a large-caliber seamless pipe, which are characterized in that: the production process comprises the following steps: alloy batching, vacuum Induction Melting (VIM), electroslag Remelting (ERS), forging, blank preparation, hot rolling, cold rolling and cold drawing, inspection and packaging; removing gas in the raw materials through preliminary refining vacuum degassing; and (3) filling nitrogen at the end of the period, adding chromium nitride to ensure the yield of nitrogen in the alloy, reducing the volatilization of nitrogen in the alloy, ensuring the electroslag remelting deslagging effect through the special configuration of an electroslag system, obtaining an electroslag ingot with good tissue raw materials, and solving the hot rolling problem of the large-specification tube blank of N08120 by formulating reasonable hot piercing heating process control and rolling parameters.
Description
Technical Field
The invention relates to the field of N08120 alloy smelting and large-caliber seamless pipe production, in particular to a high corrosion resistance N08120 material smelting and large-caliber seamless pipe production process.
Background
The N08120 alloy is a solid solution strengthened, heat resistant alloy. The alloy has extremely high-temperature strength and excellent carburization and vulcanization resistance, has extremely good oxidation resistance, and is comparable to any one of widely used Fe-Ni-Cr alloy, and the N08120 alloy is applied to environments requiring high-temperature strength and excellent vulcanization and carburization resistance, such as bar frame heat treatment baskets, metal mesh furnace belts and basket liners, muffle bodies, heat treatment clamps, garbage incinerators, radiant heating pipes, cast joint belt pins, heat accumulators, fluidized bed components and the like.
N08120 alloy as a proprietary product of Harvard corporationHR-120), which is in the technical barrier of the american haar company, is independently developed in China to replace foreign import, reduce material purchasing cost and serve as an important national photovoltaic development strategic goal. Technique for N08120 alloy existing in smeltingThe difficulties are: the nitrogen element is controlled to have a narrow region, is easy to volatilize in a smelting link and is not easy to control; meanwhile, the N08120 alloy belongs to a difficult-to-deform material, and the manufacturing of large-size pierced billets is very difficult.
Disclosure of Invention
The invention aims to provide a high corrosion resistance N08120 alloy smelting and large caliber seamless pipe production process, which removes gas in raw materials through preliminary refining vacuum degassing; and (3) filling nitrogen at the end of the period, adding chromium nitride to ensure the yield of nitrogen in the alloy, reducing the volatilization of nitrogen in the alloy, ensuring the electroslag remelting deslagging effect through the special configuration of an electroslag system, obtaining an electroslag ingot with good tissue raw materials, and solving the hot rolling problem of the large-specification tube blank of N08120 by formulating reasonable hot piercing heating process control and rolling parameters.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the production process of the high corrosion resistant N08120 material smelting and large caliber seamless pipe comprises the following steps: alloy batching, vacuum Induction Melting (VIM), electroslag Remelting (ERS), forging, blank preparation, hot rolling, cold rolling and cold drawing, inspection and packaging;
the alloy ingredients: alloy composition control: carbon (C): 0.040% -0.070%, silicon (Si) not more than 0.50%, manganese (Mn) not more than 1.00%, phosphorus (P) not more than 0.010%, sulfur (S) not more than 0.005%, chromium (Cr): 24.0% -26.0%, nickel (Ni): 35.50% -38.0%, carbon monoxide (Co) less than 3.00%, titanium (Ti) less than 0.20%, aluminum (Al) less than 0.35%, tungsten (W) less than 2.50%, molybdenum (Mo) less than 2.50%, niobium (Nb): 0.50% -0.80%, copper (Cu) is not more than 0.35%, boron (B) is not more than 0.008%, nitrogen (N): 0.18% -0.28%, and the balance of iron (Fe);
the vacuum induction smelting process comprises the following steps:
(1) Adding part of Ni and Fe in the initial and melting period, adding Mo, W and Co in the middle, and finally adding the rest Ni to finish;
(2) The change of molten steel is observed in the smelting process, the molten steel is more overturned, and the power can be reduced until the melting is completed; after melting, adding metal Cr, refining at high temperature, and sampling at the same time;
(3) Properly cooling after refining, adding C, mn, AL and Nb, refining for 15min, sampling and measuring components;
(4) Adding chromium nitride (CrN) after filling nitrogen (not less than 20000 pa), sampling and analyzing components, fine-tuning, adding B, ca after the components are qualified or regulated, smelting for 8 minutes after melting, taking a finished product sample, then filling argon (not less than 30000 pa), adding Ni-Mg (inserted into molten steel), and tapping after complete reaction;
(5) Cooling the electrode for 40+/-5 min under vacuum after casting, breaking vacuum, demoulding after 120+/-5 min of mold cooling of a mold opening chamber door, carrying out air-tight cooling, and casting to obtain the vacuum induction electrode
The electroslag remelting process comprises the following steps:
(1) Polishing the surface of the vacuum induction electrode, and cleaning the surface defect of the electrode;
(2) Baking the vacuum induction electrode, preserving the temperature at 600 ℃ for 4 hours, ensuring the electrode to be dried, and welding the false electrode after baking;
(3) The electroslag system adopts CaF2 in mass percent: al2O3: caO: mgo=50%: 26%:19%:5, baking at 700 ℃ for 4 hours before electroslag starts;
(4) Pre-charging argon before arc starting of electroslag, and starting arc starting after the oxygen content in a crystallizer is lower than 3%;
(5) Electroslag remelting current is 11000A-9000A, voltage is 38-42V, and melting speed is controlled to be 6.3-6.5 kg/min.
Preferably, the forging process is as follows: the first fire forging heating temperature is 1150+/-10 ℃, the forging temperature is 1100+/-20 ℃ and the final forging temperature is above 850 ℃; cogging and forging, namely lightly forging a light hammer, particularly lightly forging a head end, controlling the pressing amount to be 30-50 (mm) each time, crushing surface grains by the light hammer forging, overturning by 90 degrees from the middle to the two ends, and then lightly hammering after each time an electroslag ingot is forged into a square shape, chamfering by the light hammer, and then forging the square in the next step; two fires are required for each forging pass of the steel ingot, a total of 6 firings are required for the process; when the billet forging has defects, stopping further forging, and carrying out coping or cutting treatment on the defective parts.
Preferably, the blank preparation process comprises the following steps: firstly, flaw detection is carried out on the forged round steel, and the defect part is determined and cut off; and polishing the surface PT of the round steel, and detecting and eliminating surface defects.
The beneficial effects of the invention are as follows:
first: adopting a VIM+ESR process, and performing early refining vacuum degassing in the VIM process to remove gas in the raw materials; filling nitrogen at the end of the period, adding chromium nitride to ensure the yield of nitrogen in the alloy, and reducing the volatilization of nitrogen in the alloy; the ESR technology uses a specially configured electroslag system to ensure the electroslag remelting deslagging effect, and obtains an electroslag ingot with good tissue raw materials, and the alloy yield can reach more than 93 percent;
second,: the hot rolling difficulty of the large-specification tube blank of N08120 is solved through formulating reasonable hot piercing heating process control and rolling parameters;
third,: by formulating reasonable cold working deformation parameters and heat treatment process, the large-caliber seamless pipe with excellent performance and uniform structure is obtained.
Detailed Description
The technical scheme of the present invention will be clearly and completely described by examples.
The production process of the high corrosion resistant N08120 material smelting and large caliber seamless pipe comprises the following steps: alloy batching, vacuum Induction Melting (VIM), electroslag Remelting (ERS), forging, blank preparation, hot rolling, cold rolling and cold drawing, inspection and packaging;
the alloy ingredients: alloy composition control: carbon (C): 0.040% -0.070%, silicon (Si) not more than 0.50%, manganese (Mn) not more than 1.00%, phosphorus (P) not more than 0.010%, sulfur (S) not more than 0.005%, chromium (Cr): 24.0% -26.0%, nickel (Ni): 35.50% -38.0%, carbon monoxide (Co) less than 3.00%, titanium (Ti) less than 0.20%, aluminum (Al) less than 0.35%, tungsten (W) less than 2.50%, molybdenum (Mo) less than 2.50%, niobium (Nb): 0.50% -0.80%, copper (Cu) is not more than 0.35%, boron (B) is not more than 0.008%, nitrogen (N): 0.18% -0.28%, and the balance of iron (Fe);
the raw materials are selected from the following table 1:
table 1: specification table is selected as raw material
| Raw materials | Execution standard | Specification of specification |
| Ni | GB/T6516-2010 electrolytic nickel | Ni9996 |
| Cr | GB/T3211-2008 metal chromium | JCr99-A |
| Fe | GB/T9971-2017 raw material pure iron | YT2 |
| Ti | GB/T2524-2010 sponge titanium | First order/MHT-110 |
| Al | GB/T1196-2008 aluminium ingot for remelting | Al99.7 |
| Mo | GB/T3462-2017 molybdenum strips and molybdenum slabs | Mo-1 |
| Nb | GB/T6896-2007 niobium strip | TNb2 |
| W | GB/T3459-2007 tungsten bar | TW-1 |
| Co | YS/T255-2009 cobalt | Co9995 |
| C | YB/T192-2001 | First level |
| Si | GB 2881-2008-T industrial silicon | Si-1 |
The vacuum induction smelting process comprises the following steps:
example 1: the amount of the alloy added (Kg) is shown in Table 2 below:
table 2: smelting alloy addition (Kg)
The total addition amount of the alloy is about 2577kg, the yield of the vacuum ingot is about 2500kg, and the vacuum smelting yield is about 97%.
(1) Adding 441kg of Ni and 778kg of Fe in the initial and melting periods, adding 25.77kg of Mo, 25.77kg of W and 25.8kg of Co in the middle, and finally adding 500kg of Ni to finish;
(2) The change of molten steel is observed in the smelting process, the molten steel is more overturned, and the power can be reduced until the melting is completed; after melting, adding metal Cr, refining at high temperature, and sampling at the same time;
(3) Properly cooling after refining, adding C, mn, AL and Nb, refining for 15min, sampling and measuring components;
(4) Adding chromium nitride (CrN) after filling nitrogen (not less than 20000 pa), sampling and analyzing components, fine-tuning, adding B, ca after the components are qualified or regulated, smelting for 8 minutes after melting, taking a finished product sample, then filling argon (not less than 30000 pa), adding Ni-Mg (inserted into molten steel), and tapping after complete reaction;
(5) Cooling the electrode for 40+/-5 min under vacuum after casting, breaking vacuum, demoulding after 120+/-5 min of mold cooling of a mold opening chamber door, carrying out air-tight cooling, and casting to obtain the vacuum induction electrode
The electroslag remelting process comprises the following steps:
(1) Polishing the surface of the vacuum induction electrode, and cleaning the surface defect of the electrode;
(2) Baking the vacuum induction electrode, preserving the temperature at 600 ℃ for 4 hours, ensuring the electrode to be dried, and welding the false electrode after baking;
(3) The electroslag system adopts CaF2 in mass percent: al2O3: caO: mgo=50%: 26%:19%:5, baking at 700 ℃ for 4 hours before electroslag starts;
(4) Pre-charging argon before arc starting of electroslag, and starting arc starting after the oxygen content in a crystallizer is lower than 3%;
(5) The electroslag remelting current is 11000A-9000A, the voltage is 38-42V, the melting speed is controlled to be 6.3-6.5 kg/min, the weight after electroslag is about 2523kg, and the detection result of alloy components after electroslag is shown in the following table 3;
table 3: alloy composition detection results
Preferably, the forging process is as follows: the first fire forging heating temperature is 1150+/-10 ℃, the forging temperature is 1100+/-20 ℃ and the final forging temperature is above 850 ℃; cogging and forging, namely lightly forging a light hammer, particularly lightly forging a head end, controlling the pressing amount to be 30-50 (mm) each time, crushing surface grains by the light hammer forging, overturning by 90 degrees from the middle to the two ends, and then lightly hammering after each time an electroslag ingot is forged into a square shape, chamfering by the light hammer, and then forging the square in the next step; two fires are required for each forging pass of the steel ingot, a total of 6 firings are required for the process; when the billet forging has defects, stopping further forging, and carrying out coping or cutting treatment on the defective parts.
Preferably, the blank preparation process comprises the following steps: firstly, flaw detection is carried out on the forged round steel, and the defect part is determined and cut off; polishing the round steel, then carrying out surface PT, detecting and eliminating surface defects, and preparing blank according to the following technological parameters in Table 4;
table 4: blank preparation process parameters
Preferably, the hot rolling process includes a two-pass piercing process; the N08120 alloy belongs to a difficult-to-deform material, the manufacturing of large-size pierced billets has very high difficulty, a perforation heating process and a rolling process are required to be reasonably set, the heating process is kept warm uniformly, the rolling process is required to control single deformation and deformation rate, and the process is formulated according to the characteristics of the materials to participate in the following tables 5 and 6:
table 5: once-through heat perforation process parameter meter
Table 6: secondary thermal perforation process parameter table
Preferably, the parameters of the cold drawing are as follows in table 7:
table 7: cold rolling cold drawing process parameter table
The high corrosion resistant alloy N08120 material produced by the present process was examined in terms of nonmetallic inclusion grade, gas content, mechanical properties, high temperature durability, oxidation resistance environment ability, etc., and the examination results are shown in tables 8, 9, 10, 11 and 12 below.
Table 8: nonmetallic inclusion grade detection result table
Grade of nonmetallic inclusion
Table 9: gas content detection result table
Gas content
Table 10: mechanical property detection result table
Mechanical properties
Table 11: high-temperature durable detection result table
Lasting warm temperature
Table 12: oxidation resistance environmental ability detecting meter
Oxidation resistance to environmental conditions
The described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Claims (3)
1. The production process of the high corrosion resistant N08120 material smelting and large caliber seamless pipe is characterized in that: the production process comprises the following steps: alloy batching, vacuum Induction Melting (VIM), electroslag Remelting (ERS), forging, blank preparation, hot rolling, cold rolling and cold drawing, inspection and packaging;
the alloy ingredients: alloy composition control: carbon (C): 0.040% -0.070%, silicon (Si) not more than 0.50%, manganese (Mn) not more than 1.00%, phosphorus (P) not more than 0.010%, sulfur (S) not more than 0.005%, chromium (Cr): 24.0% -26.0%, nickel (Ni): 35.50% -38.0%, cobalt (Co) less than 3.00%, titanium (Ti) less than 0.20%, aluminum (Al) less than 0.35%, tungsten (W) less than 2.50%, molybdenum (Mo) less than 2.50%, niobium (Nb): 0.50% -0.80%, copper (Cu) is not more than 0.35%, boron (B) is not more than 0.008%, nitrogen (N): 0.18% -0.28%, and the balance of iron (Fe);
the vacuum induction smelting process comprises the following steps:
(1) Adding part of Ni and Fe in the initial and melting period, adding Mo, W and Co in the middle, and finally adding the rest Ni to finish;
(2) Observing molten steel change in the smelting process, and turning over the molten steel, and reducing power until the melting is completed; after melting, adding metal Cr, refining at high temperature, and sampling at the same time;
(3) Properly cooling after refining, adding C, mn, AL and Nb, refining for 15min, sampling and measuring components;
(4) Adding chromium nitride (CrN) at a pressure of not lower than 20000Pa after filling nitrogen, sampling and analyzing components, adding B, ca after fine tuning the components to be qualified or adjusting the components, smelting for 8 minutes after melting, taking a finished product sample, adding argon at a pressure of not lower than 30000Pa after filling argon, adding Ni-Mg, inserting into molten steel, fully reacting, and tapping;
(5) Cooling the electrode for 40+/-5 min under vacuum after casting, breaking vacuum, demoulding after 120+/-5 min of mold cooling of a mold opening chamber door, performing air-tight cooling, and casting to obtain the vacuum induction electrode finger 400-420 mm;
the electroslag remelting process comprises the following steps:
(1) Polishing the surface of the vacuum induction electrode, and cleaning the surface defect of the electrode;
(2) Baking the vacuum induction electrode, preserving the temperature at 600 ℃ for 4 hours, ensuring the electrode to be dried, and welding the false electrode after baking;
(3) The electroslag system adopts CaF2 in mass percent: al2O3: caO: mgo=50%: 26%:19%:5, baking at 700 ℃ for 4 hours before electroslag starts;
(4) Pre-charging argon before arc starting of electroslag, and starting arc starting after the oxygen content in a crystallizer is lower than 3%;
(5) Electroslag remelting current is 11000A-9000A, voltage is 38-42V, and melting speed is controlled to be 6.3-6.5 kg/min;
the hot rolling process comprises two times of perforation, wherein the single deformation and deformation rate need to be controlled in the rolling process,
2. the process for smelting high corrosion resistant N08120 material and producing large caliber seamless pipe according to claim 1, wherein: the forging process comprises the following steps: the first fire forging heating temperature is 1150+/-10 ℃, the forging temperature is 1100+/-20 ℃ and the final forging temperature is above 850 ℃; cogging and forging, namely lightly forging a light hammer, particularly lightly forging a head end, controlling the pressing amount to be 30-50 (mm) each time, crushing surface grains by the light hammer forging, overturning by 90 degrees from the middle to the two ends, and then lightly hammering after each time an electroslag ingot is forged into a square shape, chamfering by the light hammer, and then forging the square in the next step; two fires are needed for each forging pass of the steel ingot, and the process of phi 550, 500, 430 and phi 315 is needed for the steel ingot, and 6 fires are needed in total; when the billet forging has defects, stopping further forging, and carrying out coping or cutting treatment on the defective parts.
3. The process for smelting high corrosion resistant N08120 material and producing large caliber seamless pipe according to claim 1, wherein: the blank preparation process comprises the following steps: firstly, flaw detection is carried out on the forged round steel, and the defect part is determined and cut off; and polishing the surface PT of the round steel, and detecting and eliminating surface defects.
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