CN108531755B - Vacuum induction furnace smelting process of high-aluminum type high-temperature alloy GH6783 - Google Patents
Vacuum induction furnace smelting process of high-aluminum type high-temperature alloy GH6783 Download PDFInfo
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- CN108531755B CN108531755B CN201810316210.XA CN201810316210A CN108531755B CN 108531755 B CN108531755 B CN 108531755B CN 201810316210 A CN201810316210 A CN 201810316210A CN 108531755 B CN108531755 B CN 108531755B
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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
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- 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
- C22B4/00—Electrothermal treatment of ores or metallurgical products for obtaining metals or alloys
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- 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
- C22B9/04—Refining by applying a vacuum
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C19/00—Alloys based on nickel or cobalt
- C22C19/07—Alloys based on nickel or cobalt based on cobalt
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Abstract
The invention discloses a vacuum induction furnace smelting process of a high-aluminum type high-temperature alloy GH6783, and aims to stabilize the yield of aluminum elements and produce a GH6783 alloy electrode with qualified components and tissues by reasonable smelting process control. The technical scheme of the invention is as follows: the process flow comprises the following steps: aluminum batching → stock preparation → evacuation → charging → power feeding → charging → full melting → stirring → standing → mixing component → pouring; after the refining period of the full melting is finished, feeding aluminum, titanium and niobium in sequence; analyzing gas content in the furnace before adding aluminum to ensure that the oxygen content is less than 15 multiplied by 10‑6Nitrogen content less than 20X 10‑6(ii) a Before adding aluminum, the temperature in the furnace is reduced to 1480-1500 ℃, the yield of aluminum is ensured, and the formation of impurities is reduced. The invention adopts a reasonable smelting process to achieve stable control of the yield of the aluminum element and effectively avoid excessive formation of aluminum-containing inclusions.
Description
Technical Field
The invention belongs to a special alloy smelting process, and particularly relates to a vacuum induction furnace smelting process of a high-aluminum type high-temperature alloy GH 6783.
Background
The GH6783 alloy is an iron-cobalt-nickel-based oxidation-resistant low-expansion alloy which takes niobium, aluminum and titanium as main strengthening elements and is a ferromagnetic material with the widest application, and the alloy is characterized in that the aluminum content is high and is 5.0-6.0%, because the activity of the aluminum element is high, the element yield and the control difficulty of impurities in the smelting production process are high, the production process of the GH6783 alloy is strictly blocked abroad, relevant data cannot be found, only a few researches on the material structure and performance are available, the research work on the high-temperature alloy smelting process at home and abroad at present is not introduced, and relevant literature data is not recorded on the GH6783 alloy smelting process.
Disclosure of Invention
The invention discloses a vacuum induction furnace smelting process of a high-aluminum type high-temperature alloy GH6783, which can achieve stable aluminum element yield and produce a GH6783 alloy electrode with qualified components and tissues through reasonable smelting process control.
The technical scheme of the invention is as follows:
1. process flow
Aluminum batching → stock → evacuation → charging → electric feeding → charging → full melting → stirring → standing → mixing → pouring.
2. Specific process measures
① GH6783 alloy should have chemical composition (weight percentage, percent) in accordance with the specification of Table 1, and the ingredients are mixed according to the chemical composition.
TABLE 1
TABLE 1 (continuation)
② the amount of each raw material required for smelting is calculated according to the alloy composition control requirement.
③ it is made of high-quality refined steel, nickel, cobalt, chromium, niobium, aluminum, titanium, ferroboron, graphite electrode and intermediate alloy with accurate components, and has accurate chemical components, and all raw materials are clean and free of oil stain.
④ the order of addition is pure metal first followed by master alloy.
⑤ vacuumizing to ensure vacuum degree not more than 30Pa, charging into furnace, charging first batch, and electrifying.
⑥ the vacuum degree in refining period is controlled at 1 Pa-5 Pa, the refining period is longer than 90min, and the refining temperature is controlled at 1500-1550 deg.C.
⑦ the refining period is completed by feeding in the order of aluminum, titanium and niobium.
⑧ analysis of gas content in furnace before adding aluminium to ensure oxygen content less than 15X 10-6Nitrogen content less than 20X 10-6(ii) a Before adding aluminum, the temperature in the furnace is reduced to 1480-1500 ℃, aluminum is added in two to three batches, the single addition amount is not more than 150kg, and the mixture is stirred for 5-10 min after each addition; the dosage of the aluminum is controlled to be 5.7-5.9 percent, so that the content of the aluminum in the electrode is stably controlled to be about 5.5 percent, the yield of the aluminum is ensured, and the formation of inclusions is reduced.
⑨ the casting of the electrode is carried out under vacuum condition, the casting temperature is 1470-1490 ℃.
Description of the invention points:
① GH6783 alloy has the most aluminum content in all the deformed high-temperature alloys at present, the control of the yield has no related information at present, and the invention controls the oxygen content before adding aluminum to be less than 15 multiplied by 10-6Nitrogen content less than 20X 10-6(ii) a Adding aluminum in two to three batches, wherein the single addition amount is not more than 150 kg; simultaneously, the method reduces the temperature of the molten steel to about 1480-1490 ℃ and the like before adding aluminum, reasonably controls the yield of aluminum element, controls the adding amount of the aluminum to be 5.7-5.9 percent, and stably controls the aluminum content of the electrode to be about 5.5 percent
② the aluminum element has strong activity in the smelting process, and the oxygen content is ensured to be less than 15 x 10 by controlling the gas content before adding aluminum-6Nitrogen content less than 20X 10-6The burning loss of aluminum elements can be reduced, and excessive formation of aluminum-containing inclusions is effectively avoided.
The invention adopts a reasonable smelting process to achieve stable control of the yield of the aluminum element and effectively avoid excessive formation of aluminum-containing inclusions.
Detailed Description
The present invention is described in detail below by way of examples.
Example 1, example 1 and example 3 performed together:
the process flow comprises the following steps: aluminum batching → stock → evacuation → charging → electric feeding → charging → full melting → stirring → standing → mixing → pouring.
The process comprises the following steps:
② the amount of each raw material required for smelting is calculated according to the alloy composition control requirement.
③ it is made of high-quality refined steel, nickel, cobalt, chromium, niobium, aluminium, titanium, ferroboron, graphite electrode and intermediate alloy with accurate components.
④ the order of addition is pure metal first followed by master alloy.
⑤ melting normally, the vacuum degree is not more than 30 Pa.
⑥ the vacuum degree in refining period is controlled at 1 Pa-5 Pa, the refining period is longer than 90min, and the refining temperature is controlled at 1500-1550 deg.C.
⑧ adding Al, Ti, Nb and B, and alloying.
Example 1
GH6783 alloy, electrode ingot type phi 250mm, furnace number 15240160636
The process comprises the following steps:
① the actual compounding ingredients were carried out as in Table 2 below.
TABLE 2
Table 2 (continuation)
⑦ the gas was analyzed by sampling, the oxygen content was 10.5X 10-6Nitrogen content 15X 10-6。
⑧ the temperature is measured at 1495 deg.C, and the aluminum metal is added according to calculated amount in two times, and is stirred for 5min after each addition.
⑨ casting the electrode with diameter of 250mm at 1480 deg.C.
And (3) component analysis:
the composition of the cast electrode was analyzed and the results are shown in Table 3.
TABLE 3
Table 3 (continuation)
Example 2
GH6783 alloy, electrode ingot type phi 340mm, furnace number 15240170473
The process comprises the following steps:
① the actual compounding ingredients were carried out according to the ingredients in Table 4 below.
TABLE 4
Table 4 (continuation)
⑦ the gas was analyzed by sampling, the oxygen content was 12.5X 10-6Nitrogen content 13X 10-6。
⑧ the temperature is measured at 1480 deg.C, the metal aluminum is added according to the calculated amount in two times, and the mixture is stirred for 10min after each addition.
⑨ casting phi 340mm electrode at 1490 deg.C.
And (3) component analysis:
the composition of the cast electrode was analyzed, and the results are shown in Table 5.
TABLE 5
TABLE 5 (continuation)
Example 3
GH6783 alloy, electrode ingot type phi 340mm, furnace number 17240410025
The process comprises the following steps:
① actual compounding ingredients were carried out according to the ingredients in Table 6 below
TABLE 6
Table 6 (continue)
⑦ sample the analyzed gas, oxygen content 15X 10-6Nitrogen content 18X 10-6。
⑧ the temperature is measured at 1480 deg.C, the metal aluminum is added according to the calculated amount in two times, and the mixture is stirred for 10min after each addition.
⑨ casting phi 340mm electrode at 1490 deg.C.
And (3) component analysis:
the composition of the cast electrode was analyzed, and the results are shown in Table 7.
TABLE 7
Table 7 (continuation)
Claims (4)
1. A vacuum induction furnace smelting process of a high-aluminum type high-temperature alloy GH6783 is characterized by comprising the following steps: the smelting process comprises the following steps: aluminum batching → stock preparation → evacuation → charging → power feeding → charging → full melting → stirring → standing → mixing component → pouring;
the smelting process comprises the following specific process measures:
① GH6783 alloy should meet the following regulations in terms of weight percentage:
carbon is not more than 0.03%, silicon is not more than 0.50%, manganese is not more than 0.50%, phosphorus is not more than 0.015%, sulfur is not more than 0.005%, aluminum: 5.00% -6.00%, boron: 0.003-0.012%, chromium: 2.50% -3.50%, nickel: 26.0-30.0%, copper is not more than 0.50%, titanium: 0.10% -0.40%, Fe: 24.0% -27.0%, niobium: 2.50-3.50% and the balance of cobalt;
② calculating the amount of each raw material required by smelting according to the alloy composition control requirement;
③ high-quality refined steel, metallic nickel, metallic cobalt, metallic chromium, metallic niobium, metallic aluminum, metallic titanium, ferroboron, graphite electrode and intermediate alloy material with accurate components are selected, so as to ensure accurate chemical components, and all raw materials fed into the furnace are kept clean and free of oil stains;
④ the feeding sequence is according to the sequence of pure metal and intermediate alloy;
⑤ vacuumizing in the melting process to ensure the vacuum degree is not more than 30Pa, feeding materials into the furnace in batches, and feeding the materials for electrolysis after feeding the first batch;
⑥ the vacuum degree in the refining period is controlled between 1Pa and 5Pa, the refining period is more than 90min, and the refining temperature is controlled between 1500 ℃ and 1550 ℃;
⑦ feeding aluminum, titanium and niobium in sequence after the refining period;
⑧ analysis of gas content in furnace before adding aluminium to ensure oxygen content less than 15X 10-6Nitrogen content less than 20X 10-6The temperature in the furnace is reduced to 1480-1500 ℃ before adding aluminum, the aluminum is added in two batches according to the calculated amount, the stirring is carried out for 5-10 min after each addition, the adding amount of the aluminum is controlled to be 5.7-5.9 percent, the aluminum content of the electrode is stably controlled to be 5.5 percent, the aluminum yield is ensured, and the formation of impurities is reduced;
⑨ the casting of the electrode is carried out under vacuum condition, the casting temperature is 1470-1490 ℃.
2. The vacuum induction furnace smelting process of the high-aluminum type high-temperature alloy GH6783 according to claim 1, characterized in that: analysis of gas content in the furnace, oxygen content 10.5X 10-6Nitrogen content 15X 10-6(ii) a Before adding aluminum, the temperature in the furnace is measured to be 1495 ℃, the aluminum is added in two batches according to the calculated amount on average, and the mixture is stirred for 5min after each addition.
3. The vacuum induction furnace smelting process of the high-aluminum type high-temperature alloy GH6783 according to claim 1, characterized in that: analysis of gas content in the furnace, oxygen content 12.5X 10-6Nitrogen content 13X 10-6(ii) a Before adding aluminum, the temperature in the furnace is 1480 ℃, aluminum is added in two batches according to the calculated amount, and the mixture is stirred for 10min after each addition.
4. The vacuum induction furnace smelting process of the high-aluminum type high-temperature alloy GH6783 according to claim 1, characterized in that: analysis of gas content in the furnace, oxygen content 15X 10-6Nitrogen content 18X 10-6(ii) a Before adding aluminum, the temperature in the furnace is 1480 ℃, aluminum is added in two batches according to the calculated amount, and the mixture is stirred for 10min after each addition.
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| CN111455199A (en) * | 2020-04-16 | 2020-07-28 | 江苏星火特钢有限公司 | Smelting process of high-temperature alloy vacuum induction furnace |
| CN111531158B (en) * | 2020-06-16 | 2021-08-13 | 江苏兴湖耐火材料有限公司 | Manufacturing method of high-strength scouring-resistant stopper rod for continuous casting |
| CN114317996B (en) * | 2021-12-08 | 2023-04-28 | 抚顺特殊钢股份有限公司 | Manufacturing method of low-gas-content high-titanium low-aluminum nickel cobalt alloy electroslag remelting electrode |
| CN114990344B (en) * | 2022-06-07 | 2023-11-24 | 大冶特殊钢有限公司 | Method for producing high Al alloy by adopting vacuum consumable smelting |
| CN117363913B (en) * | 2023-12-08 | 2024-03-08 | 成都先进金属材料产业技术研究院股份有限公司 | Low-carbon high-aluminum niobium-containing cobalt-based superalloy and preparation method thereof |
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| CN101440436B (en) * | 2007-11-21 | 2010-04-21 | 中国科学院金属研究所 | Purified smelting technique for high-temperature superalloy |
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