Nickel base alloy cast ingot and preparation method thereof

A nickel-based alloy and ingot casting technology is applied in the field of nickel-based alloy ingots and their preparation, which can solve the problems of unstable chemical composition of alloy ingots, low ingot yield and uneven internal structure, and avoid air pollution. And the effect of burning loss of alloying elements, alloy purity and ingot yield, shortening production cycle

CN102896303BInactive Publication Date: 2015-02-18上海丰渠特种合金有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-02-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method of a nickel base alloy cast ingot. The preparation method comprises the following steps of: pouring nickel base alloy molten steel into a casting mould; and heating the molten steel in the casting mould by an electric arc device, and after that, cooling to obtain the cast ingot, wherein a pair of electrodes in the electric arc device are nonconsumable electrodes, and a bottom plate of the casting mould is a cooling water tank. The method greatly shortens the production period, saves the auxiliary material and saves a great deal of energy. The invention also discloses the nickel base alloy cast ingot prepared by the method, and the nickel base alloy cast ingot is good in crystalline state and high in alloy purity.
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Description

technical field

[0001] The invention relates to the field of alloy ingots, in particular to a nickel-based alloy ingot and a preparation method thereof. Background technique

[0002] In the prior art, methods for producing nickel-based alloy ingots include vacuum induction melting plus electroslag remelting and vacuum induction melting plus vacuum self-consumption. Both of them need to be smelted and poured into consumable electrodes, and then remelted in a cold state after surface treatment and welding, and the second remelting wastes a lot of man-hours and consumes a lot of auxiliary materials and electric energy. In the former, the purity of the alloy is greatly reduced due to air pollution during secondary remelting, the chemical composition of the alloy ingot is unstable due to the influence of slag, and the internal structure of the ingot is uneven due to the influence of the interface between electrodes. Although the second remelting of the latter can ensure the unif...

Examples

Embodiment 1

[0035] Example 1 Production of nickel-based alloy Inconel718 ingot

[0036] Pour Inconel718 molten steel 2 refined in 1 ton vacuum induction furnace 1 into tundish 3, and its temperature is controlled at 1580°C. Connect the circulating cooling water tank 6 on the bottom plate of the casting mold. The molten steel 2 is poured from the bottom nozzle of the tundish 3 into the casting mold 5 made of 00Cr25Ni20 with a specification of Φ360*1600mm. After the casting is completed, the arc device is turned on and the power is kept at 300KW. The electric arc between the two ends of the non-consumable electrode 4 heats the molten steel 2 in the mold, and the molten steel 2 is directional solidified from bottom to top to form an ingot, and the ingot is fully fed. The arc heating time was 55 minutes. Close the arc device, and after the ingot is cooled, the mold is demoulded to obtain a nickel-based alloy Inconel718 ingot without surface structure defects, see figure 1 .

Embodiment 2

[0037] Embodiment 2 Production of GH3128 nickel-based alloy ingot

[0038] Pour 1.5 tons of GH3128 molten steel 2 refined in the vacuum induction furnace 1 into the tundish 3 and control the temperature at 1600°C. Connect the circulating cooling water tank 6 on the bottom plate of the casting mold. The molten steel 2 is poured from the bottom nozzle of the tundish 3 into the casting mold 5 with a specification of Φ320*1300mm made of 00Cr25Ni20. The electric arc between the two ends of the non-consumable electrode 4 on the top heats the molten steel 2 in the mold, and the molten steel 2 solidifies directionally from bottom to top to form an ingot, and fully feeds the ingot. The arc heating time is 40 minutes. Turn off the arc device, and demould after the ingot is cooled, so as to obtain a GH3128 high-temperature alloy ingot without surface structure defects. figure 1 .

Embodiment 3

[0039] Example 3 Production of nickel-based alloy NC30Fe (Inconel690) ingot

[0040] Pour NC30Fe (Inconel690) molten steel 2 refined in 1 ton vacuum induction furnace 1 into tundish 3, and its temperature is controlled at 1700°C. Connect the circulating cooling water tank 6 on the bottom plate of the casting mold. The molten steel 2 is poured from the bottom nozzle of the tundish 3 into the casting mold 5 with a specification of Φ360*1600mm made of 00Cr25Ni20. After the pouring is completed, the arc device is turned on and the power is kept at 280KW. The electric arc between the two ends of the non-consumable electrode 4 on the top of the casting mold heats the molten steel in the casting mold, and the molten steel 2 solidifies directionally from bottom to top to form an ingot, and fully feeds the ingot. The arc heating time is 70 minutes. Close the arc device, and after the ingot is cooled, the mold is demoulded to obtain a nickel-based alloy NC30Fe (Inconel690) ingot withou...