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Method for smelting nickel-based high temperature alloy in vacuum induction furnace

A technology of nickel-based superalloy and vacuum induction furnace, which is applied in the field of nickel-based alloy smelting in vacuum induction furnace, can solve the problems of easily exceeding the standard carbon content, difficulty in removing N and H, and reduction, etc., so as to increase the specific surface area and enhance refining. Degassing effect, effect of increasing contact area

Active Publication Date: 2012-10-10
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Nickel-based superalloys are usually smelted by a vacuum induction furnace. The alloy contains a large amount of nitride-forming elements Cr, Al, Ti, etc., and the gas elements N and H have high solubility in nickel-based alloys, so they can be removed from the nickel-based alloy liquid. N and H are more difficult
At present, vacuum induction furnace smelts nickel-based superalloys. One method is to add a certain amount of carbon to the raw material, and carry out degassing and refining through carbon deoxidation reaction under relatively high vacuum; the other method is to extend the refining time and During the alloying and alloying stages, the nickel-based alloy liquid was frozen for many times, and degassed by reducing the gas solubility; the disadvantages of these two methods are that the final carbon content in the alloy is easy to exceed the standard, and the kinetic conditions of the degassing reaction are poor, and the degassing ability Limited, long smelting time, usually the N content in the product is more than 70ppm, and the H is more than 2ppm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The equipment of this embodiment adopts a 500kg vacuum induction furnace: the ultimate vacuum degree is 6.67×10 -2 Pa, the power supply is 400KW, the frequency is 1000HZ, and the furnace load is 500kg. Alloy type: Inconel718

[0024] Ⅰ Load the alloy raw materials into the furnace according to the ratio

[0025] The amount of alloy to be added is calculated according to the mass percentage of the alloy composition, and metal chromium, nickel plate, metal molybdenum and nickel niobium are loaded into the furnace. (The rest of the alloy is added in the later stage of refining) The mass percentage of the composition of the alloy is:

[0026] C≤0.03%; Si≤0.35%; Mn≤0.35%; P≤0.015%; S≤0.002%;

[0027] Cr 17.0-21.0%; Al 0.6-0.8%; Ti 0.8-1.10%; Nb 4.75-5.50%;

[0028] Mo 2.8-3.3%; Ni 50.0-55.0%; Mg 0.002-0.003%;

[0029] The rest is Fe and unavoidable impurities.

[0030] The mass percent of the composition of the present embodiment is:

[0031] C 0.015%; Si 0.17%...

Embodiment 2

[0045] The equipment of this embodiment adopts a 500kg vacuum induction furnace: the ultimate vacuum degree is 6.67×10 -2 Pa, the power supply is 400KW, the frequency is 1000HZ, and the furnace load is 500kg. Alloy type: In617

[0046] Ⅰ Load the alloy raw materials into the furnace according to the ratio (the total furnace capacity is 450kg)

[0047] The mass percent of the composition of the alloy is:

[0048] C≤0.025%; Si≤0.30%; Mn≤0.30%; P≤0.012%; S≤0.001%;

[0049] Cr 21.5-22.5%; Co 11.5-12.5%; Al 1.1-1.3%; Ti 0.3-0.5%; Mo 8.5-9.5%; Fe≤2.0%; Mg 0.002-0.004%; B 0.001-0.003%; 0.05;

[0050] The rest are Ni and unavoidable impurities.

[0051] The mass percent of the composition of the present embodiment is:

[0052]C 0.012%; Si 0.15%; Mn 0.15%; P 0.006%; S 0.0005%;

[0053] Cr 22.0%; Co 12.0%; Al 1.2%; Ti 0.4%; Mo 9.0%; Fe 1.0%; Mg 0.003%; B 0.002%; Zr 0.04%; the rest is Ni and unavoidable impurities.

[0054] Ⅱ Close the furnace cover to vacuumize, and when t...

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Abstract

The invention relates to a method for smelting a nickel-based high temperature alloy in a vacuum induction furnace. The method sequentially comprises the following steps of: I, putting alloy raw materials into the furnace in a ratio; II, closing a furnace cover, vacuumizing, and performing power transmission to melt furnace burden; III, melting at the speed of less than or equal to 1 / 2 maximum furnace capacity / hour; IV, after the furnace burden is completely melted, starting performing bottom argon blowing, and refining for 20 to 25 minutes; V, stopping argon blowing, adding Al and Ti, and alloying; VI, after Al and Ti are completely melted, performing bottom argon blowing, and refining; VII, after refining is finished, closing a vacuum pump, and filling argon into the furnace and an ingot mold; VIII, alloying at the finishing point, namely adding B, Zr and a rare earth element, and adding a Ni-Mg alloy; and IX, performing electrified tapping after 3 to 4 minutes, and casting into an alloy ingot. By the method for smelting the nickel-based high temperature alloy in the vacuum induction furnace, refining time is 35 to 40 minutes, and the nickel-based high temperature alloy with very low carbon content can be obtained.

Description

technical field [0001] The invention relates to a method for smelting nickel-based alloys in a vacuum induction furnace. Background technique [0002] Nickel-based superalloys are usually smelted by a vacuum induction furnace. The alloy contains a large amount of nitride-forming elements Cr, Al, Ti, etc., and the gas elements N and H have high solubility in nickel-based alloys, so they can be removed from the nickel-based alloy liquid. N and H are more difficult. At present, vacuum induction furnace smelts nickel-based superalloys. One method is to add a certain amount of carbon to the raw material, and carry out degassing and refining through carbon deoxidation reaction under relatively high vacuum; the other method is to extend the refining time and During the alloying and alloying stages, the nickel-based alloy liquid was frozen for many times, and degassed by reducing the gas solubility; the disadvantages of these two methods are that the final carbon content in the all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/03C22C1/06C22C19/03
Inventor 赵鸿燕王贺利王伟乔俊生
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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