CN114032434A - High corrosion-resistant N08120 material smelting and large-caliber seamless pipe production process - Google Patents
High corrosion-resistant N08120 material smelting and large-caliber seamless pipe production process Download PDFInfo
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- CN114032434A CN114032434A CN202111257978.2A CN202111257978A CN114032434A CN 114032434 A CN114032434 A CN 114032434A CN 202111257978 A CN202111257978 A CN 202111257978A CN 114032434 A CN114032434 A CN 114032434A
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- 238000003723 Smelting Methods 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 230000007797 corrosion Effects 0.000 title description 6
- 238000005260 corrosion Methods 0.000 title description 6
- 238000005242 forging Methods 0.000 claims abstract description 43
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 35
- 239000000956 alloy Substances 0.000 claims abstract description 35
- 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 30
- 238000002844 melting Methods 0.000 claims abstract description 23
- 230000008018 melting Effects 0.000 claims abstract description 23
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 16
- 230000006698 induction Effects 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000007670 refining Methods 0.000 claims abstract description 12
- 238000002360 preparation method Methods 0.000 claims abstract description 9
- 238000005098 hot rolling 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
- 238000005097 cold rolling Methods 0.000 claims abstract description 6
- 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 18
- 239000010959 steel Substances 0.000 claims description 18
- 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 12
- 238000001816 cooling Methods 0.000 claims description 12
- 230000007547 defect Effects 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 12
- 239000010955 niobium Substances 0.000 claims description 11
- 239000011651 chromium Substances 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 239000011572 manganese Substances 0.000 claims description 9
- 238000005498 polishing Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 229910052758 niobium Inorganic materials 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 239000010936 titanium Substances 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
- 238000005266 casting Methods 0.000 claims description 5
- 239000011733 molybdenum Substances 0.000 claims description 5
- 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
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal 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
- 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
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-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
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 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
- 229910052742 iron 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
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 238000010308 vacuum induction melting process Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- 229910052593 corundum Inorganic materials 0.000 claims 1
- 229910001845 yogo sapphire Inorganic materials 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 10
- 239000007789 gas Substances 0.000 abstract description 6
- 238000005096 rolling process Methods 0.000 abstract description 5
- 239000002893 slag Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000009849 vacuum degassing Methods 0.000 abstract description 3
- 229910004261 CaF 2 Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Classifications
-
- 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 process for smelting a high-corrosion-resistance N08120 material and producing a large-caliber seamless pipe, which is characterized by comprising the following steps of: 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 → packaging; removing gas in the raw material by early refining and vacuum degassing; nitrogen is filled at the end of the period, chromium nitride is added to ensure the yield of nitrogen in the alloy, the volatilization of nitrogen in the alloy is reduced, the slag removing effect of electroslag remelting is ensured through the special configuration of an electroslag slag system, an electroslag ingot with good tissue raw material is obtained, and the problem of hot rolling of a N08120 large-specification tube blank is solved through setting reasonable hot perforation 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 process for smelting a high-corrosion-resistance N08120 material and producing a large-caliber seamless pipe.
Background
The N08120 alloy is a solution-strengthened heat-resistant alloy. The alloy has both extremely high-temperature strength and good resistance to carburization and vulcanization, and the alloy has excellent oxidation resistance which is comparable to that of any one of widely used Fe-Ni-Cr alloys, and the N08120 alloy is applied to environments requiring high-temperature strength and good resistance to carburization and carburization, such as bar frame heat treatment baskets, metal mesh furnace belts and basket liners, muffle furnace bodies, heat treatment clamps, garbage incinerators, radiant heating pipes, casting connecting belts, pins, heat accumulators, fluidized bed components and the like.
N08120 alloy as patented product of Ha corporation of America (
HR-120), which is in the technical barrier of the United states Hardgrove corporation, is independently developed and replaced by imported products, reduces the material purchasing cost, and is taken as an important national photovoltaic development strategy target. The technical difficulties of smelting the N08120 alloy are as follows: the nitrogen element control exists in a narrow interval, is easy to volatilize in a smelting link and is difficult to control; meanwhile, the N08120 alloy belongs to a material difficult to deform, and the large-size pierced billet is very difficult to manufacture.
Disclosure of Invention
The invention aims to provide a high corrosion-resistant N08120 alloy smelting and large-caliber seamless tube production process, which removes gas in raw materials by early-stage refining vacuum degassing; nitrogen is filled at the end of the period, chromium nitride is added to ensure the yield of nitrogen in the alloy, the volatilization of nitrogen in the alloy is reduced, the slag removing effect of electroslag remelting is ensured through the special configuration of an electroslag slag system, an electroslag ingot with good tissue raw material is obtained, and the problem of hot rolling of a N08120 large-specification tube blank is solved through setting reasonable hot perforation heating process control and rolling parameters.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the production process of the high corrosion-resistant N08120 material smelting and the 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 → packaging;
the alloy is prepared by the following steps: controlling alloy components: carbon (C): 0.040% -0.070%, silicon (Si) is not more than 0.50%, manganese (Mn) is not more than 1.00%, phosphorus (P) is not more than 0.010%, sulfur (S) is not more than 0.005%, chromium (Cr): 24.0% -26.0%, nickel (Ni): 35.50% -38.0%, less than 3.00% of carbon monoxide (Co), less than 0.20% of titanium (Ti), less than 0.35% of aluminum (Al), less than 2.50% of tungsten (W), less than 2.50% of molybdenum (Mo), and niobium (Nb): 0.50% -0.80%, copper (Cu) not more than 0.35%, boron (B) not more than 0.008%, nitrogen (N): 0.18-0.28% and the balance iron (Fe);
the vacuum induction melting process comprises the following steps:
(1) adding part of Ni and Fe in the initial and melting periods, adding Mo, W and Co in the middle, and finally adding the rest Ni until the completion;
(2) the change of molten steel is observed in the smelting process, the molten steel is overturned seriously, and the power can be reduced until the melting is finished; adding metal Cr after melting, refining at high temperature, and sampling simultaneously;
(3) properly cooling after refining, adding C, Mn, AL and Nb, refining for 15min, sampling and measuring components;
(4) filling nitrogen (not less than 20000pa), adding chromium nitride (CrN), sampling and analyzing components, finely adjusting, enabling the components to be qualified or adjusting the components, adding B, Ca, melting for 8 minutes after melting down, sampling a finished product, filling argon (not less than 30000pa), adding Ni-Mg (inserting into molten steel) for complete reaction, and tapping;
(5) cooling the cast electrode in vacuum for 40 +/-5 min, breaking vacuum, opening the mold chamber door for cooling for 120 +/-5 min, demolding, cooling in air, and casting to obtain vacuum induction electrode
The electroslag remelting process comprises the following steps:
(1) polishing the surface of the vacuum induction electrode, and cleaning the surface defects of the electrode;
(2) baking the vacuum induction electrode, keeping the temperature at 600 ℃ for 4 hours to ensure that the electrode is dry, and welding a false electrode after baking;
(3) the electroslag system adopts CaF 2: al2O 3: CaO: MgO is 50%: 26%: 19%: 5 percent, and baking for 4 hours at 700 ℃ before electroslag begins;
(4) before electroslag arc starting, argon is precharged, and arc starting is started after the oxygen content in the crystallizer is lower than 3%;
(5) the electroslag remelting current is 11000A-9000A, the voltage is 38-42V, and the melting speed is controlled to be 6.3-6.5 kg/min.
Preferably, the forging process is as follows: the first hot forging heating temperature is 1150 +/-10 ℃, the start forging temperature is 1100 +/-20 ℃, and the finish forging temperature is above 850 ℃; cogging forging, namely performing light hammer forging, particularly performing light forging on the head end, controlling the pressing amount to be 30-50 (mm) each time of forging, crushing surface crystal grains by the light hammer forging, turning the surface crystal grains at 90 degrees from the middle to the two ends, performing light hammer chamfering after each electroslag ingot is forged into a square shape, and performing next-step forging; two heats are needed for each forging pass of the steel ingot,
the process, total 6 fires are required; and when the billet forging has defects, stopping further forging, and polishing or cutting off the defective parts.
Preferably, the blank preparation process comprises the following steps: flaw detection is carried out on the forged round steel, and a defect part is determined and cut off; and (5) polishing the round steel, and then carrying out surface PT, and detecting and eliminating surface defects.
The invention has the beneficial effects that:
firstly, the method comprises the following steps: refining, vacuum degassing at the early stage in the VIM process by adopting a VIM + ESR process, and removing gas in the raw material; nitrogen is filled at the end of the period, chromium nitride is added to ensure the yield of nitrogen in the alloy, and the volatilization of nitrogen in the alloy is reduced; in the ESR process, an electroslag system with special configuration is used for ensuring the electroslag remelting deslagging effect, an electroslag ingot with good tissue raw material is obtained, and the alloy yield can reach more than 93 percent;
secondly, the method comprises the following steps: by setting reasonable hot piercing heating process control and rolling parameters, the problem of hot rolling of the N08120 large-specification tube blank is solved;
thirdly, the method comprises the following steps: 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 solution of the present invention will be clearly and completely described by the following embodiments.
The production process of the high corrosion-resistant N08120 material smelting and the 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 → packaging;
the alloy is prepared by the following steps: controlling alloy components: carbon (C): 0.040% -0.070%, silicon (Si) is not more than 0.50%, manganese (Mn) is not more than 1.00%, phosphorus (P) is not more than 0.010%, sulfur (S) is not more than 0.005%, chromium (Cr): 24.0% -26.0%, nickel (Ni): 35.50% -38.0%, less than 3.00% of carbon monoxide (Co), less than 0.20% of titanium (Ti), less than 0.35% of aluminum (Al), less than 2.50% of tungsten (W), less than 2.50% of molybdenum (Mo), and niobium (Nb): 0.50% -0.80%, copper (Cu) not more than 0.35%, boron (B) not more than 0.008%, nitrogen (N): 0.18-0.28% and the balance iron (Fe);
the raw materials are selected from the following table 1:
table 1: raw material selection specification table
| Raw material | Execution criteria | Specification of |
| Ni | Electrolytic nickel of GB/T6516- | Ni9996 |
| Cr | GB/T3211- | JCr99-A |
| Fe | GB/T9971-contained 2017 raw material pure iron | YT2 |
| Ti | GB/T2524-2010 titanium sponge | First order/MHT-110 |
| Al | Aluminum ingot for remelting GB/T1196- | Al99.7 |
| Mo | GB/T3462 and 2017 molybdenum strip and molybdenum plate blank | Mo-1 |
| Nb | GB/T6896-2007 niobium strip | TNb2 |
| W | GB/T3459-2007 tungsten strip | TW-1 |
| Co | YS/T255 cobalt 2009- | Co9995 |
| C | YB/T192-2001 | First stage |
| Si | GB 2881-2008-T industrial silicon | Si-1 |
The vacuum induction melting process comprises the following steps:
example 1: the addition amounts (Kg) of the metallurgical alloys are shown in the following Table 2:
table 2: adding amount (Kg) of smelting alloy
The total addition amount of the alloy is about 2577kg, about 2500kg of vacuum ingot is obtained, and the yield of vacuum melting is about 97%.
(1) Adding Ni 441kg and Fe 778kg in the initial and melting period, adding Mo 25.77kg, W25.77 kg and Co 25.8kg in the middle, and finally adding Ni 500kg until the process is finished;
(2) the change of molten steel is observed in the smelting process, the molten steel is overturned seriously, and the power can be reduced until the melting is finished; adding metal Cr after melting, refining at high temperature, and sampling simultaneously;
(3) properly cooling after refining, adding C, Mn, AL and Nb, refining for 15min, sampling and measuring components;
(4) filling nitrogen (not less than 20000pa), adding chromium nitride (CrN), sampling and analyzing components, finely adjusting, enabling the components to be qualified or adjusting the components, adding B, Ca, melting for 8 minutes after melting down, sampling a finished product, filling argon (not less than 30000pa), adding Ni-Mg (inserting into molten steel) for complete reaction, and tapping;
(5) cooling the cast electrode in vacuum for 40 +/-5 min, breaking vacuum, opening the mold chamber door for cooling for 120 +/-5 min, demolding, cooling in air, and casting to obtain vacuum induction electrode
The electroslag remelting process comprises the following steps:
(1) polishing the surface of the vacuum induction electrode, and cleaning the surface defects of the electrode;
(2) baking the vacuum induction electrode, keeping the temperature at 600 ℃ for 4 hours to ensure that the electrode is dry, and welding a false electrode after baking;
(3) the electroslag system adopts CaF 2: al2O 3: CaO: MgO is 50%: 26%: 19%: 5 percent, and baking for 4 hours at 700 ℃ before electroslag begins;
(4) before electroslag arc starting, argon is precharged, and arc starting is started after the oxygen content in the 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 results of alloy components after electroslag are shown in the following table 3;
table 3: alloy composition detection results
Preferably, the forging process is as follows: the first hot forging heating temperature is 1150 +/-10 ℃, the start forging temperature is 1100 +/-20 ℃, and the finish forging temperature is above 850 ℃; cogging forging, namely performing light hammer forging, particularly performing light forging on the head end, controlling the pressing amount to be 30-50 (mm) each time of forging, crushing surface crystal grains by the light hammer forging, turning the surface crystal grains at 90 degrees from the middle to the two ends, performing light hammer chamfering after each electroslag ingot is forged into a square shape, and performing next-step forging; two heats are needed for each forging pass of the steel ingot,
the process, total 6 fires are required; and when the billet forging has defects, stopping further forging, and polishing or cutting off the defective parts.
Preferably, the blank preparation process comprises the following steps: flaw detection is carried out on the forged round steel, and a defect part is determined and cut off; the round steel is polished and then subjected to surface PT, surface defects are detected and eliminated, and the blank preparation process parameters are as shown in the following table 4;
table 4: blank preparation process parameters
Preferably, the hot rolling process comprises a two-pass piercing process; the N08120 alloy belongs to a material difficult to deform, the manufacturing of a large-size pierced billet has very high difficulty, a perforation heating process and a rolling process need to be reasonably set, the heat preservation in the heating process is uniform, the single deformation and the deformation rate need to be controlled in the rolling process, and the processes are made according to the characteristics of the material and participate in the following tables 5 and 6:
table 5: parameter table for one-time hot punching process
Table 6: secondary hot punching process parameter table
Preferably, the cold-rolling and cold-drawing parameters are as follows:
table 7: cold-rolling and cold-drawing process parameter table
The high corrosion resistant alloy N08120 material produced by the process is tested in the aspects of non-metallic inclusion grade, gas content, mechanical property, high temperature durability, oxidation resistant environment capacity and the like, and the test results are shown in the following tables 8, 9, 10, 11 and 12.
Table 8: non-metallic inclusion grade detection result table
Grade of non-metallic inclusions
Table 9: gas content test result table
Gas content
Table 10: mechanical property detection result table
Mechanical properties
Table 11: high temperature durable test result table
Lasting temperature
Table 12: antioxidant environment capacity detecting meter
Ability to resist oxidative environment
The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (3)
1. The smelting and large-caliber seamless tube production process of the high-corrosion-resistance N08120 material 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 → packaging;
the alloy is prepared by the following steps: controlling alloy components: carbon (C): 0.040% -0.070%, silicon (Si) is not more than 0.50%, manganese (Mn) is not more than 1.00%, phosphorus (P) is not more than 0.010%, sulfur (S) is not more than 0.005%, chromium (Cr): 24.0% -26.0%, nickel (Ni): 35.50% -38.0%, less than 3.00% of carbon monoxide (Co), less than 0.20% of titanium (Ti), less than 0.35% of aluminum (Al), less than 2.50% of tungsten (W), less than 2.50% of molybdenum (Mo), and niobium (Nb): 0.50% -0.80%, copper (Cu) not more than 0.35%, boron (B) not more than 0.008%, nitrogen (N): 0.18-0.28% and the balance iron (Fe);
the vacuum induction melting process comprises the following steps:
(1) adding part of Ni and Fe in the initial and melting periods, adding Mo, W and Co in the middle, and finally adding the rest Ni until the completion;
(2) the change of molten steel is observed in the smelting process, the molten steel is overturned seriously, and the power can be reduced until the melting is finished; adding metal Cr after melting, refining at high temperature, and sampling simultaneously;
(3) properly cooling after refining, adding C, Mn, AL and Nb, refining for 15min, sampling and measuring components;
(4) filling nitrogen (not less than 20000pa), adding chromium nitride (CrN), sampling and analyzing components, finely adjusting, enabling the components to be qualified or adjusting the components, adding B, Ca, melting for 8 minutes after melting down, sampling a finished product, filling argon (not less than 30000pa), adding Ni-Mg (inserting into molten steel) for complete reaction, and tapping;
(5) cooling the electrode in vacuum for 40 +/-5 min after casting, breaking the vacuum, opening a mold chamber door for mold cooling for 120 +/-5 min, demolding, wind shielding and air cooling, and casting to obtain the vacuum induction electrode, wherein the front edge is 400-the back edge is 420 mm;
the electroslag remelting process comprises the following steps:
(1) polishing the surface of the vacuum induction electrode, and cleaning the surface defects of the electrode;
(2) baking the vacuum induction electrode, keeping the temperature at 600 ℃ for 4 hours to ensure that the electrode is dry, and welding a false electrode after baking;
(3) CaF is adopted as the mass percentage of the electroslag system2：Al2O3: CaO: MgO = 50%: 26%: 19%: 5 percent, and baking for 4 hours at 700 ℃ before electroslag begins;
(4) before electroslag arc starting, argon is precharged, and arc starting is started after the oxygen content in the crystallizer is lower than 3%;
(5) the electroslag remelting current is 11000A-9000A, the voltage is 38-42V, and the melting speed is controlled to be 6.3-6.5 kg/min.
2. The process for smelting the high-corrosion-resistance N08120 material and producing the large-caliber seamless pipe according to claim 1, which is characterized in that: the forging process comprises the following steps: the first hot forging heating temperature is 1150 +/-10 ℃, the start forging temperature is 1100 +/-20 ℃, and the finish forging temperature is above 850 ℃; cogging forging, namely performing light hammer forging, particularly performing light forging on the head end, controlling the pressing amount to be 30-50 (mm) each time of forging, crushing surface crystal grains by the light hammer forging, turning the surface crystal grains at 90 degrees from the middle to the two ends, performing light hammer chamfering after each electroslag ingot is forged into a square shape, and performing next-step forging; two fires are needed for each forging pass of the steel ingot, and the processes of phi 550 → 500 square → 430 square → phi 315 totally need 6 fires; and when the billet forging has defects, stopping further forging, and polishing or cutting off the defective parts.
3. The process for smelting the high-corrosion-resistance N08120 material and producing the large-caliber seamless pipe according to claim 1, which is characterized in that: the blank preparation process comprises the following steps: flaw detection is carried out on the forged round steel, and a defect part is determined and cut off; and (5) polishing the round steel, and then carrying out surface PT, and detecting and eliminating surface defects.
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