CN111471880A - Ingot casting preparation method for reducing Cu-Ni-Si-Mg alloy casting slag inclusion - Google Patents
Ingot casting preparation method for reducing Cu-Ni-Si-Mg alloy casting slag inclusion Download PDFInfo
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- CN111471880A CN111471880A CN202010348575.8A CN202010348575A CN111471880A CN 111471880 A CN111471880 A CN 111471880A CN 202010348575 A CN202010348575 A CN 202010348575A CN 111471880 A CN111471880 A CN 111471880A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/004—Copper alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
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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
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/06—Alloys based on copper with nickel or cobalt as the next major constituent
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Abstract
The invention relates to a new material, belongs to the non-ferrous metal smelting and processing industry, and particularly relates to a preparation method of an ingot casting for reducing slag inclusion in Cu-Ni-Si-Mg alloy casting. The invention adopts technical treatment on the basis of the traditional process, and the specific method comprises the following steps: the method comprises the following steps of preparing materials (except for adding Cu, Ni, Si and Cu-Mg alloy) → smelting (medium frequency induction smelting furnace) → component analysis (only analyzing Ni and Si) → adjusting components (Ni and Si) → rotary holding furnace (power frequency induction smelting furnace) → adding Cu-Mg alloy → adding composite slag dissolving agent → stirring → adding calcined charcoal → holding and standing → component analysis → casting → sawing. The invention has the following effects: the surface of the Cu-Ni-Si-Mg copper alloy cast ingot has no slag inclusion phenomenon, and the interior of the Cu-Ni-Si-Mg copper alloy cast ingot has no slag inclusion defect through macroscopic structure inspection, so that the cast ingot quality is qualified. The slag inclusion phenomenon is not found in the milling surface of the cast ingot after hot rolling, and the phenomena of peeling, holes, edge cracking and the like do not exist in the subsequent cold rolling processing of the strip.
Description
Technical Field
The invention relates to a new material, belongs to the non-ferrous metal smelting and processing industry, and particularly relates to a preparation method of an ingot casting capable of reducing Cu-Ni-Si-Mg alloy casting slag inclusion.
Background
The Cu-Ni-Si-Mg alloy strip product has the characteristics of high strength, good conductivity, high-temperature softening resistance, thermal relaxation resistance and the like, and is widely applied to the electronic fields of lead frames, elastic elements, miniature terminals, connecting device materials and the like. The preparation of the Cu-Ni-Si-Mg alloy cast ingot is used as the first process of the alloy strip production, and is of great importance to the influence of the surface quality and the internal structure of the strip which is subsequently rolled and processed. The copper alloy ingot comprises (Ni 2.2-4.2%, Si 0.25-1.25%, Mg 0.05-0.3%, Cu ≥ 96.5%, and inevitable impurities in balance).
The production process generally adopted for preparing the Cu-Ni-Si alloy cast ingot at present is as follows: batching → smelting → ingredient analysis → adjusting ingredient → (converter) → casting → sawing.
The production process mainly has the following defects: the Cu-Ni-Si-Mg alloy has an alloy Mg element which is easy to oxidize and slag, so that a great amount of slag inclusion along the circumferential direction of the cast ingot exists on the surface of the cast ingot in the casting process, and the internal slag inclusion phenomenon is also found in the macrostructure inspection of the cast ingot. Some slag inclusions with deeper surfaces and internal slag inclusions cannot be completely removed in the subsequent face milling process. The blanks with slag are easy to have quality defects of peeling, holes and the like in the subsequent strip cold rolling process, so that a large amount of waste products are caused; meanwhile, due to the defect of slag inclusion of the blank, the phenomena of edge cracking, strip breakage and the like occur in rolling, the normal high-speed rolling of the rolling mill is influenced, and even equipment is damaged. In order to improve the product quality and the production efficiency, the slag inclusion defect of the alloy cast ingot needs to be reduced, and the cleanness and the good internal structure of the cast ingot are ensured.
Disclosure of Invention
The invention aims to solve the technical problems of reducing the slag inclusion phenomenon in the Cu-Ni-Si-Mg alloy casting, ensuring the surface and internal quality of cast ingots, reducing the phenomena of edge cracking, peeling, holes and belt breakage and improving the yield, and provides the cast ingot preparation method for reducing the slag inclusion phenomenon in the Cu-Ni-Si-Mg alloy casting.
In order to solve the technical problems, the invention adopts technical treatment based on the traditional process, and the specific method comprises the following steps:
the method comprises the following steps of preparing materials (except for adding Cu, Ni, Si and Cu-Mg alloy) → smelting (medium frequency induction smelting furnace) → component analysis (only analyzing Ni and Si) → adjusting components (Ni and Si) → rotary holding furnace (power frequency induction smelting furnace) → adding Cu-Mg alloy → adding composite slag dissolving agent → stirring → adding calcined charcoal → holding and standing → component analysis → casting → sawing. The composite slag dissolving agent is prepared from MgCl2、KCl 、BaCl2Prepared according to a certain mass ratio, wherein MgCl is2:45-55%；KCl:39-42%；BaCl2:4-13%。
a. Preparing materials: sequentially adding standard electrolytic copper, nickel and silicon according to the parts by mass;
b. smelting: the smelting temperature is 1200 ℃ and 1250 ℃;
c. turning to a heat preservation furnace: the temperature of the converter is 1220 and 1240 ℃;
d. adding a Cu-Mg alloy: adding Cu-Mg intermediate alloy in a heat preservation furnace according to the proportion;
e. adding calcined charcoal: adding calcined charcoal in a heat preservation furnace, wherein the thickness of the calcined charcoal is 150-200 mm;
f. and (3) heat preservation and standing: the heat preservation and standing time is more than or equal to 30min, and the tapping temperature is 1200-;
g. casting: the casting temperature is 1200 ℃ and 1220 ℃, the casting speed is 80-120mm/min, the cooling water flow is 25-35 m/h, and the vibration frequency is 20-50 times/min.
The ingredients are as follows: adding nickel and silicon when the smelting temperature reaches over 1200 ℃; the covering thickness of the calcined charcoal in the smelting furnace is controlled to be 150-220 mm.
Smelting: and (3) adopting a medium-frequency induction smelting furnace, standing for more than 30min after adding nickel and silicon, and then sampling and analyzing.
The addition of Cu-Mg alloy: adding Cu-Mg intermediate alloy according to the proportion in a heat preservation furnace, adding a slag agent, and supplementing calcined charcoal to 150-class 200 mm.
Standing the heat preservation furnace: standing for 30-50min, controlling the uniformity of nickel, silicon and other contents, and reducing the gas content.
The casting comprises the steps of carrying out semi-continuous vibration casting by adopting a power frequency cored holding furnace and an integral crystallizer, wherein the specification (the thickness ×, the width × and the height) of the crystallizer is 175mm × 430mm × 400mm, covering the liquid level with carbon black when the liquid level of a melt rises to the height 1/2-2/3 of the crystallizer after the casting is started, wherein the covering thickness is 10-20mm, rapidly and thoroughly removing slag by using a carbon black shovel when the liquid level rises to be close to the upper edge of the crystallizer, and then covering the carbon black with the thickness of 10-20 mm.
The difference from the traditional process is that: (1) the invention only prepares Ni and Si in the smelting furnace, the converter can be placed in a holding furnace after the two elements are qualified, and an easily-oxidized element Mg is added in the holding furnace, thus avoiding the phenomena of Mg slagging, burning loss, oxidation in the converter (open type) process and the like in the intermediate frequency smelting furnace. Mg is added into the heat preservation furnace, and a slag melting agent is added at the same time, so that the oxidation slagging of the melt is greatly reduced. (2) The copper alloy casting covering agent is mostly covered by carbon black, and the carbon black covering is added when the casting liquid level rises to be close to the upper edge of the crystallizer. In the invention, when the liquid level of the melt rises to the height 1/2-2/3 of the crystallizer during the initial casting, the liquid level is quickly covered by carbon black, and the covering thickness is 10-20 mm. When the liquid level rises to be close to the upper edge of the crystallizer, the slag is rapidly and thoroughly removed by a carbon black shovel, and then 10-20mm of carbon black is covered. So far, normal vibration casting can be carried out. Therefore, the liquid level height 1/2-2/3 and the liquid level are covered by carbon black when the liquid level rises to be close to the upper edge of the crystallizer at the initial casting stage, the oxidation slagging of the melt in the crystallizer under the naked condition in the initial casting stage is greatly reduced, the slag is rapidly and completely removed when the melt is cast to be close to the upper edge of the crystallizer, the oxidation slag generated at the beginning of the casting stage is cleaned, and the oxidation slag is prevented from being clamped into the inner part or the surface of the cast ingot. After slag removal, the cleanliness of the melt in the crystallizer is very high, the carbon black is covered in the whole area at the moment, the covering thickness is large, air is isolated, the quality of the melt in the crystallizer is ensured, and slagging and slag inclusion are avoided.
The copper-nickel-silicon alloy ingot prepared by the preparation method comprises the following chemical components in parts by mass: 2.2 to 4.2 percent of Ni, 0.25 to 1.5 percent of Si, 0.03 to 0.5 percent of Mg, more than or equal to 96.3 percent of Cu, and the balance of inevitable impurities; the Cu-Ni-Si-Mg copper alloy cast ingot has no slag inclusion on the surface, and has no defects of slag inclusion, ash inclusion and the like in low-power inspection of internal structure. The invention has the following effects: the surface of the copper alloy cast ingot has no slag inclusion defect, and the interior macroscopic structure inspection has no defects of slag inclusion, ash inclusion and the like. The slag inclusion phenomenon is not found in the milled surface of the cast ingot after hot rolling; and the subsequent cold rolling processing has no peeling, holes, edge cracking and strip breaking phenomena.
Detailed Description
Example 1
1. Preparing materials: and adding standard electrolytic copper, nickel and silicon into a smelting furnace in sequence according to the parts by mass.
2. Smelting: the smelting temperature is 1200-1250 ℃.
3. Converter: converter temperature 1220-.
4. Adding Cu-Mg alloy and a composite slag dissolving agent: adding Cu-Mg intermediate alloy in a heat preservation furnace according to the proportion, and covering the charcoal with the thickness of 150 mm. MgCl in composite slag-dissolving agent255%；KCl:39%；BaCl2:6%。
5. Standing the holding furnace: standing for 30min, and tapping at 1215 ℃.
6. Casting: the casting temperature is 1200-.
The Cu-Ni-Si-Mg copper alloy cast ingot cast in the embodiment 1 has no slag inclusion on the surface and no slag inclusion defect in the interior through macroscopic structure inspection. The slag inclusion phenomenon is not found in the milling surface of the cast ingot after hot rolling, and the phenomena of peeling, holes, edge cracking and the like do not occur in the subsequent cold rolling processing of the strip.
Example 2
1. Preparing materials: and sequentially adding standard electrolytic copper, nickel, silicon and the like according to the parts by mass.
2. Smelting: the smelting temperature is 1200-1250 ℃.
3. Converter: converter temperature 1220-.
4. Adding Cu-Mg alloy and a composite slag dissolving agent: adding Cu-Mg intermediate alloy according to the proportion in a heat preservation furnace, and covering the charcoal with the thickness of 180 mm. MgCl in composite slag-dissolving agent2:45%；KCl: 42%；BaCl2: 13%。
5. Standing the holding furnace: standing for 40min, and discharging at 1200 ℃.
6. Casting: the casting temperature is 1200-.
The Cu-Ni-Si-Mg copper alloy cast ingot cast in the embodiment 2 has no slag inclusion on the surface and has no slag inclusion defect in the interior through macroscopic structure inspection. The slag inclusion phenomenon is not found in the milling surface of the cast ingot after hot rolling, and the phenomena of peeling, holes, edge cracking and the like do not exist in the subsequent cold rolling processing of the strip.
Example 3
1. Preparing materials: and sequentially adding standard electrolytic copper, nickel, silicon and the like according to the parts by mass.
2. Smelting: the smelting temperature is 1200-1250 ℃.
3. Converter: converter temperature 1220-.
4. Adding Cu-Mg alloy and a composite slag dissolving agent: adding Cu-Mg intermediate alloy according to the proportion in a heat preservation furnace, and covering the charcoal with the thickness of 160 mm. MgCl in composite slag-dissolving agent2:50%；KCl: 40%；BaCl2: 10%。
5. Standing the holding furnace: standing for 50min, and discharging at 1210 ℃.
6. Casting: the casting temperature is 1200-.
The Cu-Ni-Si-Mg copper alloy cast ingot cast in example 3 has no slag inclusion on the surface and no slag inclusion defect in the interior through macroscopic structure inspection. The slag inclusion phenomenon is not found in the milling surface of the cast ingot after hot rolling, and the phenomena of peeling, holes, edge cracking and the like do not exist in the subsequent cold rolling processing of the strip.
Example 4
1. Preparing materials: and sequentially adding standard electrolytic copper, nickel, silicon and the like according to the parts by mass.
2. Smelting: the smelting temperature is 1230 ℃, and the covering thickness of the calcined charcoal is controlled to be 150 mm.
3. Converter: the converter temperature was 1220 ℃.
4. Adding Cu-Mg alloy and a composite slag dissolving agent: adding Cu-Mg intermediate alloy according to the proportion in a heat preservation furnace, and covering the charcoal with the thickness of 160 mm. MgCl in composite slag-dissolving agent2:53%；KCl: 41%；BaCl2: 6%。
5. Standing the holding furnace: standing for 35min, and discharging at 1200 ℃.
6. Casting: when the liquid level of the melt rises to the height 1/2 of the crystallizer after the casting is started, covering the liquid level with carbon black, wherein the covering thickness is 10mm, when the liquid level rises to be close to the upper edge of the crystallizer, rapidly and thoroughly removing slag by using a carbon black shovel, and then covering the carbon black with the thickness of 10 mm; the casting temperature is 1200 ℃, the casting speed is 80mm/min, the cooling water flow is 25 m/h, and the trolley vibration frequency below the integral crystallizer is 20 times/min.
Example 5
1. Preparing materials: and sequentially adding standard electrolytic copper, nickel, silicon and the like according to the parts by mass.
2. Smelting: the smelting temperature is 1240 ℃, and the covering thickness of the calcined charcoal is controlled to be 190 mm.
3. Converter: the converter temperature is 1230 ℃.
4. Adding Cu-Mg alloy and a composite slag dissolving agent: adding Cu-Mg intermediate alloy in a heat preservation furnace according to the proportion, and covering the charcoal with the thickness of 190 mm. MgCl in composite slag-dissolving agent2:54%；KCl: 42%；BaCl2: 4%。
5. Standing the holding furnace: standing for 45min, and tapping at 1215 ℃.
6. Casting: when the casting is started until the liquid level of the melt rises to the height 2/3 of the crystallizer, the liquid level is covered by carbon black with the covering thickness of 15mm, when the liquid level rises to be close to the upper edge of the crystallizer, the slag is rapidly and completely removed by a carbon black shovel, and then the carbon black with the thickness of 15mm is covered again. The casting temperature is 1210 ℃, the casting speed is 100mm/min, the cooling water flow is 28 m/h, and the trolley vibration frequency below the integral crystallizer is 30 times/min.
Example 6
1. Preparing materials: and sequentially adding standard electrolytic copper, nickel, silicon and the like according to the parts by mass.
2. Smelting: the smelting temperature is 1250 ℃, and the covering thickness of the calcined charcoal is controlled to be 220 mm.
3. Converter: the converter temperature is 1240 ℃.
4. Adding Cu-Mg alloy and a composite slag dissolving agent: adding Cu-Mg intermediate alloy in a heat preservation furnace according to the proportion, and covering the charcoal with the thickness of 200 mm. MgCl in composite slag-dissolving agent2:48%；KCl: 42%；BaCl2: 10%。
5. Standing the holding furnace: standing for 48min, and discharging at 1220 ℃.
6. Casting: when the casting is started until the liquid level of the melt rises to the height 2/3 of the crystallizer, the liquid level is covered by carbon black with the covering thickness of 20mm, when the liquid level rises to be close to the upper edge of the crystallizer, the slag is rapidly and completely removed by a carbon black shovel, and then the carbon black with the thickness of 20mm is covered again. The casting temperature is 1220 ℃, the casting speed is 120mm/min, the cooling water flow is 35 m/h, and the trolley vibration frequency below the integral crystallizer is 40 times/min.
Claims (6)
1. A preparation method for reducing Cu-Ni-Si-Mg alloy casting slag inclusion is characterized by comprising the following steps: the method comprises the following steps: batching → smelting → component analysis → adjusting component → transferring to a heat preservation furnace → adding Cu-Mg alloy → stirring → adding calcined charcoal → heat preservation and standing → component analysis → casting → sawing;
wherein: a. preparing materials: sequentially adding copper, nickel and silicon according to the mass ratio;
b. smelting: the smelting temperature is 1200 ℃ and 1250 ℃;
c. turning to a heat preservation furnace: the temperature of the converter is 1220 and 1240 ℃;
d. adding a Cu-Mg alloy: adding Cu-Mg intermediate alloy in a heat preservation furnace according to the proportion;
e. adding calcined charcoal: the thickness of the calcined charcoal is 150-200 mm;
f. and (3) heat preservation and standing: the heat preservation and standing time is more than or equal to 30min, and the tapping temperature is 1200-;
g. casting: the casting temperature is 1200 ℃ and 1220 ℃, the casting speed is 80-120mm/min, the cooling water flow is 25-35 m/h, and the vibration frequency is 20-50 times/min.
2. The preparation method for reducing the slag inclusion in the Cu-Ni-Si-Mg alloy casting process, according to claim 1, is characterized in that: after the Cu-Mg alloy is added, the composite slag dissolving agent is added, and the method comprises the following steps: batching → smelting → component analysis → adjusting component → transferring to a heat preservation furnace → adding Cu-Mg alloy → adding composite slag dissolver → stirring → adding calcined charcoal → heat preservation standing → component analysis → casting → sawing; the composite slag dissolving agent is prepared from MgCl2、KCl 、BaCl2Prepared according to a certain mass ratio, wherein MgCl is2:45-55%；KCl:39-42%；BaCl2:4-13%。
3. The preparation method for reducing the slag inclusion in the Cu-Ni-Si-Mg alloy casting process as claimed in claim 1 or 2, wherein the method comprises the following steps: the ingredients are as follows: adding nickel and silicon when the smelting temperature reaches over 1200 ℃; the thickness of the calcined charcoal coating is controlled to be 150-220 mm.
4. The preparation method for reducing the slag inclusion in the Cu-Ni-Si-Mg alloy casting process as claimed in claim 1 or 2, wherein the method comprises the following steps: smelting: and (3) adopting a medium-frequency induction smelting furnace, standing for more than 30min after adding nickel and silicon, and then sampling and analyzing.
5. The preparation method for reducing the slag inclusion in the Cu-Ni-Si-Mg alloy casting process as claimed in claim 1 or 2, wherein the method comprises the following steps: casting: when the liquid level of the melt rises to the height 1/2-2/3 of the crystallizer after the casting is started, covering the liquid level with carbon black, wherein the covering thickness is 10-20mm, and when the liquid level rises to be close to the upper edge of the crystallizer, rapidly and completely removing slag by using a carbon black shovel, and then covering with 10-20mm of carbon black.
6. The preparation method for reducing the slag inclusion in the Cu-Ni-Si-Mg alloy casting process as claimed in claim 1 or 2, wherein the method comprises the following steps: and (3) heat preservation and standing: keeping the temperature and standing for 30-50min, controlling the uniformity of the contents of nickel and silicon, and reducing the gas content.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113278828A (en) * | 2021-04-13 | 2021-08-20 | 太原晋西春雷铜业有限公司 | Preparation process for homogenizing C19400 copper alloy cast ingot structure |
| CN113278829A (en) * | 2021-04-13 | 2021-08-20 | 太原晋西春雷铜业有限公司 | Semi-continuous preparation process of large-size C70250 copper alloy ingot |
| CN116732384A (en) * | 2023-08-08 | 2023-09-12 | 宁波兴业盛泰集团有限公司 | Copper nickel silicon alloy cast ingot and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113278828A (en) * | 2021-04-13 | 2021-08-20 | 太原晋西春雷铜业有限公司 | Preparation process for homogenizing C19400 copper alloy cast ingot structure |
| CN113278829A (en) * | 2021-04-13 | 2021-08-20 | 太原晋西春雷铜业有限公司 | Semi-continuous preparation process of large-size C70250 copper alloy ingot |
| CN116732384A (en) * | 2023-08-08 | 2023-09-12 | 宁波兴业盛泰集团有限公司 | Copper nickel silicon alloy cast ingot and preparation method thereof |
| CN116732384B (en) * | 2023-08-08 | 2023-11-21 | 宁波兴业盛泰集团有限公司 | Copper nickel silicon alloy cast ingot and preparation method thereof |
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Application publication date: 20200731 |