WO2022218444A1 - 超高n含量高温合金的vim炉冶炼方法 - Google Patents
超高n含量高温合金的vim炉冶炼方法 Download PDFInfo
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- WO2022218444A1 WO2022218444A1 PCT/CN2022/095043 CN2022095043W WO2022218444A1 WO 2022218444 A1 WO2022218444 A1 WO 2022218444A1 CN 2022095043 W CN2022095043 W CN 2022095043W WO 2022218444 A1 WO2022218444 A1 WO 2022218444A1
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- nitrogen
- smelting
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- 238000003723 Smelting Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 46
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 15
- 239000000956 alloy Substances 0.000 title claims abstract description 15
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000000126 substance Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 43
- 150000004767 nitrides Chemical class 0.000 claims description 43
- 229910000601 superalloy Inorganic materials 0.000 claims description 32
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 26
- 239000011651 chromium Substances 0.000 claims description 24
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 16
- 229910052786 argon Inorganic materials 0.000 claims description 13
- 239000011572 manganese Substances 0.000 claims description 13
- 238000007670 refining Methods 0.000 claims description 13
- 229910052804 chromium Inorganic materials 0.000 claims description 12
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 9
- 239000011261 inert gas Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 2
- RRZKHZBOZDIQJG-UHFFFAOYSA-N azane;manganese Chemical compound N.[Mn] RRZKHZBOZDIQJG-UHFFFAOYSA-N 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 51
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 26
- 238000005266 casting Methods 0.000 abstract description 12
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 238000007689 inspection Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- 241001062472 Stokellia anisodon Species 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 239000010955 niobium Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- SJKRCWUQJZIWQB-UHFFFAOYSA-N azane;chromium Chemical compound N.[Cr] SJKRCWUQJZIWQB-UHFFFAOYSA-N 0.000 description 1
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- -1 preferably Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-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
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/023—Alloys based on nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
-
- 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
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- 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
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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- 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
Definitions
- the invention belongs to the field of vacuum smelting of superalloys in the metallurgical industry, and particularly relates to a VIM furnace smelting method for superalloys with ultra-high N content.
- Ultra-high N content superalloy is a commonly used material in power plants, and is mostly used to manufacture forgings, rings and other products. Affected by the use environment and the special requirements for the purity of the alloy, the smelting of the alloy should be produced in a VIM furnace. In the process of smelting super high N content superalloy in VIM furnace, in high vacuum state, nitrogen element is easy to volatilize with the vacuum system, and the ideal target value cannot be obtained. In the high vacuum environment of VIM, it is usually impossible to effectively control the ultra-high content of N elements, so that the yield obtained by the traditional smelting process is very low.
- one of the objects of the present invention is to provide a VIM furnace smelting method of a super high N content superalloy (also can be said to be: a kind of super high N content superalloy VIM furnace smelting process) Control method for precise control of N content).
- the process method can ensure the target content of nitrogen and greatly improve the yield of the product.
- a VIM furnace smelting method for a superalloy with an ultra-high N content includes a smelting step and a pouring step in a VIM furnace; in the later stage of the smelting, nitrogen-containing substances are added to the VIM furnace to adjust the N content.
- the VIM furnace is a vacuum induction melting furnace.
- the mass percentage of N in the superalloy with ultra-high N content is 1500-3000ppm, preferably 2000-3000ppm, more preferably 2700- 3000ppm; that is, after the casting step, the N content in the ultra-high N-content superalloy obtained is 1500-3000 ppm, preferably 2000-3000 ppm, more preferably 2700-3000 ppm.
- the nitrogen-containing substance is a nitrogen-containing alloy with a nitrogen-containing mass percentage of 3% or more; at least one of manganese and aluminum nitride; preferably, the nitrogen-containing substance (such as ferrochromium nitride) is a nitrogen-containing substance after baking treatment; more preferably, the baking temperature is 750-1100 DEG C, the time is ⁇ 6 hours; compared with the usual non-baking of nitrogen-containing substances (such as ferrochromium nitride), the present invention innovatively performs the baking of nitrogen-containing substances (such as ferrochromium nitride) In order to remove the gas in the nitrogen-containing substances (mainly to remove H), reduce the temperature difference between the nitrogen-containing substances and the molten steel, and avoid causing a violent reaction to affect the yield of N.
- the device for performing the roasting and the VIM furnace are located in the same workshop. Among them, if the temperature is lower than 750 °C, the effect of removing H is not good, and if the temperature exceeds 1100 °C, a part of the dissolved N in the ferrochromium nitride will be decomposed. Eventually, the yield of N will be affected; and the baking time is preferably more than 6 hours, so as to have the effect of removing H.
- the inert gas is argon
- the pressure of the argon in the VIM furnace is ⁇ 10000pa; the pressure of the argon is set to be as large as If the pressure is too small, the N content of the product alloy will not meet the requirements, and the N yield will decrease after the addition of nitrogen-containing substances (such as ferrochromium nitride), because the vacuum system of the vacuum induction furnace is a dynamic balance process.
- Part of the N will be removed from the furnace with the vacuum system, so it needs to be supplemented by more nitrogen-containing substances (such as ferrochromium nitride), resulting in increased costs or unqualified final components. , it acts as a compressive stress on the molten steel surface, forcing the N brought into the molten steel by nitrogen-containing substances (such as ferrochromium nitride) into the molten steel to increase the resistance of the liquid surface, and the increased furnace pressure can also slow down the furnace.
- the dynamic balance of the system is carried out; preferably, the introduction of the inert gas continues until the end of the pouring.
- the smelting includes a melting stage and a refining stage, and the later stage of the smelting refers to the later stage of refining.
- the time from adding the nitrogen-containing substance (such as ferrochromium nitride) to the start of pouring is no more than 15 minutes ; If the time between the addition of the nitrogen-containing species (such as ferrochromium nitride) to the start of pouring is too long, the yield of N in the alloy will be reduced.
- the nitrogen-containing substance such as ferrochromium nitride
- the amount of metallic chromium added is all the metal 80-85% of the total mass of the chromium raw material; the remaining 15-20% of the metal chromium is added according to the required amount before the inert gas is introduced in the later stage of smelting to adjust the composition.
- the ultra-high N content superalloy of the present invention is a kind of metal material based on iron and nickel, which can work continuously at a high temperature above 600 ° C, preferably , a class of metal materials that work for a long time under stress.
- the composition of the superalloy with ultra-high N content is as follows in terms of mass percentage: C: 0.02-0.10%; Cr: 23.00-27.00 %; Ni: 35.00-39.00%; W: ⁇ 0.50%; Mo: ⁇ 1.00%; P: ⁇ 0.04%; S: ⁇ 0.03%; Mn: ⁇ 1.50%; Si: ⁇ 1.00%; B: ⁇ 0.01% ; Nb: 0.40-0.90%; Co: ⁇ 3.00%; N: 0.15-0.30%; Al: ⁇ 0.40%; Ti: ⁇ 0.20%; Cu: ⁇ 0.50%;
- An ultra-high N content superalloy is prepared by adopting the above-mentioned smelting method of the ultra-high N content superalloy in a VIM furnace.
- the technical principle of obtaining the ideal target N content by VIM smelting in the present invention is that the fixed nitrogen content in ferrochromium nitride is much larger than that of other alloy raw materials, so ferrochromium nitride is used as the band of N element in the superalloy. into the medium.
- VIM is smelted in a high vacuum state, N element will be excluded from the furnace in the form of free state with the vacuum system, and it is very difficult to effectively and accurately control the nitrogen content.
- the present invention controls the addition timing of ferrochromium nitride (adding in the later stage of refining); controls the addition conditions (rushes into high-pressure inert gas before adding ferrochromium nitride to improve the yield of N element); controls the addition of ferrochromium nitride time to pour. In the case of ensuring the yield of N element, it is poured into an ingot. High-temperature alloy products with ideal target values are obtained.
- the present invention has the following positive effects:
- the method of the present invention is simple, easy and effective, and does not need to add special equipment and tooling.
- the present invention improves the yield of N element in the smelting process of the VIM furnace by comprehensively improving the raw materials and the smelting process, and realizes the precise control of the N element content of the superalloy , so that the target content of nitrogen can be guaranteed and the ideal product can be obtained.
- the present invention effectively solves the problem of the yield of N element in a high vacuum state, improves the yield of products such as rings, and reduces the production cost of manufacturing enterprises.
- the present invention can ensure the yield of nitrogen elements by reasonably baking the ferrochromium nitride, and at the same time reduce the water in the ferrochromium nitride to bring H into the molten steel.
- the present invention changes from the original high vacuum state to a high pressure state by filling the Ar gas of more than 10000Pa, so that the molten steel surface is in a dense compressive stress, which can enhance the solubility of the molten steel to N, thereby improving the yield.
- the ferrochromium nitride of the present invention can be any brand of ferrochromium nitride with a nitrogen content of more than 3 wt%.
- the ferrochromium nitride with the brand of FeNCr3-A is used as an example for illustration.
- Embodiment 1 of the present invention utilizes a VIM furnace with a nominal capacity of 6 tons to smelt this ultra-high nitrogen content superalloy, comprising the following steps:
- Step 1 Ferrochromium Nitride Baking: Ferrochromium nitride is baked in a high temperature annealing furnace in the workshop.
- N content (the mass percentage of N in ferrochromium nitride) is 5.1%; baking (heating) temperature: 930° C.; baking time: 8.5 hours.
- Step 2 Charging before smelting: Ni, Fe, Nb, Cr and other raw materials are successively loaded into the VIM furnace; 100% of ferrochromium nitride is reserved without adding; 20% of metal chromium is reserved without adding.
- Step 3 smelting process: smelting the raw materials (including the melting period and the refining period, the mark of the completion of the melting period is that the monitoring full melting temperature is 1530°C, the temperature in the refining period is 1510°C, and the time is 130 minutes), and the refining period is added.
- the required amount of metal chromium is used to adjust the composition.
- the furnace is filled with argon gas to make the furnace pressure 10000pa argon gas, and then ferrochromium nitride is added to adjust the N content.
- Step 4 pouring process: pour the molten steel obtained in the smelting process, wherein the time from the addition of ferrochromium nitride to the start of pouring (tapping) is 14 minutes.
- Step 5 Inspection: inspect the casting composition content (wt%) according to the standard requirements, C: 0.061%; Cr: 25.40%; Ni: 37.03%; P: 0.006%; S: 0.002%; Mn: 0.74%; Si: 0.470 %; B: ⁇ 0.01%; Nb: 0.63%; N: 0.2857%; Al: 0.230%; Ti: 0.05%; Cu: 0.01%; H: 0.0001%.
- the nitrogen yield ie nitrogen yield: the ratio of the nitrogen content in the obtained product to the content of nitrogen substituted in the raw materials used
- the yield were 76.92% and 100%, respectively.
- Embodiment 1 of the present invention utilizes a VIM furnace with a nominal capacity of 6 tons to smelt the superalloy with ultra-high nitrogen content. Include the following steps:
- Step 1 Ferrochromium Nitride Baking: Ferrochromium nitride is baked in a high temperature annealing furnace in the workshop.
- the parameters of the ferrochromium nitride baking are: the N content is 5.1%, the baking (heating) temperature: 930° C.; the baking time: 8.0 hours.
- Step 2 Charging before smelting: Ni, Fe, Nb, Cr and other raw materials are successively loaded into the VIM furnace; 100% of ferrochromium nitride is reserved without adding; 20% of metal chromium is reserved without adding.
- Step 3 smelting process: smelting the raw materials (including the melting period and the refining period, the completion of the melting period is marked as monitoring the full melting temperature of 1533 ° C, the temperature of the refining period is 1510 ° C, and the time is 120-130 minutes), wherein the melting process adds The required amount of metal chromium is used to adjust the composition.
- argon gas with a pressure of 10,000pa is filled, and then ferrochromium nitride is added to adjust the N content.
- Step 4 pouring process: pour the molten steel obtained in the smelting process, wherein the time from the addition of ferrochromium nitride to the start of pouring (tapping) is 15 minutes.
- Step 5 Inspection: According to the standard requirements, inspect the casting composition content (wt%), C: 0.060%; Cr: 25.60%; Ni: 37.00%; P: 0.005%; S: 0.001%; Mn: 0.76%; Si: 0.440 %; Nb: 0.63%; N: 0.2893%; Al: 0.250%; Ti: 0.04%; Cu: 0.01%. H: 0.0001%.
- the nitrogen yield and yield were 76.90% and 100%, respectively.
- Step 5 Inspection: According to the standard requirements, inspect the casting composition content (wt%), C: 0.061%; Cr: 25.30%; Ni: 37.05%; P: 0.005%; S: 0.002%; Mn: 0.75%; Si: 0.500 %; B: ⁇ 0.01%; Nb: 0.65%; N: 0.2937%; Al: 0.250%; Ti: 0.05%; Cu: 0.01%; H: 0.00015%.
- the nitrogen yield and yield were 76.70% and 100%, respectively.
- Step 5 Inspection: Inspect the casting composition content (wt%) according to the standard requirements, C: 0.059%; Cr: 25.33%; Ni: 37.00%; P: 0.004%; S: 0.001%; Mn: 0.70%; Si: 0.480 %; B: ⁇ 0.01%; Nb: 0.62%; N: 0.2900%; Al: 0.250%; Ti: 0.04%; Cu: 0.01%; H: 0.00015%
- the nitrogen yield and yield were 76.80% and 100%, respectively.
- Step 5 Inspection: According to the standard requirements, inspect the casting composition content (wt%), C: 0.061%; Cr: 25.35%; Ni: 37.01%; P: 0.005%; S: 0.001%; Mn: 0.72%; Si: 0.500 %; B: ⁇ 0.01%; Nb: 0.65%; N: 0.2955%; Al: 0.250%; Ti: 0.05%; Cu: 0.01%; If it is too high, the durability and fatigue life during the user's use will be affected).
- the nitrogen yield was 76.80%.
- Step 5 Inspection: According to the standard requirements, inspect the casting composition content (wt%), C: 0.060%; Cr: 25.30%; Ni: 37.05%; P: 0.005%; S: 0.001%; Mn: 0.72%; Si: 0.460 %; B: ⁇ 0.01%; Nb: 0.60%; N: 0.2890%; Al: 0.250%; Ti: 0.05%; Cu: 0.01%; H: 0.00009%.
- the nitrogen yield was 63.34%.
- Step 5 Inspection: According to the standard requirements, inspect the casting composition content (wt%), C: 0.059%; Cr: 25.33%; Ni: 37.10%; P: 0.005%; S: 0.001%; Mn: 0.70%; Si: 0.510 %; B: ⁇ 0.01%; Nb: 0.66%; N: 0.2910%; Al: 0.260%; Ti: 0.06%; Cu: 0.01%; H: 0.0001%.
- the nitrogen yield and yield were 74.38% and 100%, respectively.
- the nitrogen yield and yield were 75.80% and 100%, respectively.
- Example 1 the step (1) of Example 1, that is, the step of baking ferrochromium nitride, is omitted, and other steps are the same as those of Example 1.
- Unbaked chromium nitride mainly causes a large amount of H element to be brought into the alloy by chromium nitride, resulting in excessive H element content and becoming waste.
- the nitrogen yield and yield were 76.15% and 0.0%, respectively.
- the casting composition content (wt%): C: 0.059%; Cr: 25.34%; Ni: 37.15%; P: 0.005%; S: 0.001%; Mn: 0.71%; Si: 0.520%; B: ⁇ 0.01%; Nb: 0.65%; N: 0.1010%; Al: 0.270%; Ti: 0.06%; Cu: 0.01%; H: 0.0001%
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Abstract
Description
Claims (10)
- 一种超高N含量高温合金的VIM炉冶炼方法,其特征在于,所述VIM炉冶炼方法包括在VIM炉中进行的熔炼步骤、和浇注步骤;在所述熔炼的后期,向所述VIM炉中加入含氮物质以调整N含量。
- 权利要求1所述的VIM炉冶炼方法,其特征在于,所述超高N含量高温合金中N的质量含量为1500-3000ppm,优选为2000-3000ppm,更优选为2700-3000ppm。
- 权利要求1所述的VIM炉冶炼方法,其特征在于,所述含氮物质为含氮质量百分比为3%以上的含氮合金;进一步优选为氮化铬铁、氮化锰和氮化铝中的至少一种;优选地,所述含氮物质为经过了烘烤处理之后的含氮物质;更优选地,所述烘烤的温度为750-1100℃,时间为≥6小时;更优选地,进行所述烘烤的装置和VIM炉位于同一车间。
- 权利要求1所述的VIM炉冶炼方法,其特征在于,在所述熔炼的后期,加入所述含氮物质之前,向所述VIM炉中通入惰性气体,优选地,所述惰性气体为氩气,所述VIM炉内氩气的压强≥10000pa;优选地,所述惰性气体的通入持续到所述浇注结束。
- 权利要求1所述的VIM炉冶炼方法,其特征在于,所述熔炼包括熔化期和精炼期,所述熔炼的后期是指精炼后期。
- 权利要求1所述的VIM炉冶炼方法,其特征在于,从加入所述含氮物质到浇注开始之间的时间为不超过15分钟。
- 权利要求1所述的VIM炉冶炼方法,其特征在于,在所述熔炼步骤中,在熔炼前向VIM炉中加入原料时,金属铬的加入量为全部金属铬原料总质量的80-85%;剩余的15-20%所述金属铬根据需要量在熔炼后期通入所述惰性 气体之前加入以调整成分。
- 权利要求1所述的VIM炉冶炼方法,其特征在于,所述超高N含量高温合金是以铁、镍为基,能在600℃以上的高温下持续工作的一类金属材料,优选地,在有应力作用下长期工作的一类金属材料。
- 权利要求1所述的VIM炉冶炼方法,其特征在于,按照质量百分比,所述超高N含量高温合金的成分组成如下:C:0.02-0.10%;Cr:23.00-27.00%;Ni:35.00-39.00%;W:≤0.50%;Mo:≤1.00%;P:≤0.04%;S:≤0.03%;Mn:≤1.50%;Si:≤1.00%;B:≤0.01%;Nb:0.40-0.90%;Co:≤3.00%;N:0.15-0.30%;Al:≤0.40%;Ti:≤0.20%;Cu:≤0.50%;Fe:余量。
- 一种超高N含量高温合金,其特征在于,所述超高N含量高温合金为采用权利要求1-9中任一项所述的VIM炉冶炼方法所制备得到的。
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