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A kind of high-strength corrosion-resistant iron-nickel-based superalloy and its preparation method

A high-temperature alloy and iron-nickel-based technology, which is applied in the field of high-strength and corrosion-resistant iron-nickel-based superalloy and its preparation, can solve the problems of poor processing performance and achieve the effects of improving alloy processing performance, reducing raw material costs, and excellent oxidation resistance

Active Publication Date: 2020-04-14
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the above-mentioned alloys all have problems such as poor processability, so their use as large-diameter thick-walled tube materials still needs to be studied

Method used

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  • A kind of high-strength corrosion-resistant iron-nickel-based superalloy and its preparation method
  • A kind of high-strength corrosion-resistant iron-nickel-based superalloy and its preparation method
  • A kind of high-strength corrosion-resistant iron-nickel-based superalloy and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The high-strength and corrosion-resistant iron-nickel-based superalloy of this embodiment includes: Cr: 15%, Ti: 0.7%, Al: 3.0%, Si: 0.5%, Mn: 0.5%, C: 0.1%, Fe : 45%, the balance is Ni;

[0032] The preparation method of the present embodiment comprises the following steps:

[0033] 1) Raw material preparation: the composition includes by mass percentage: Cr: 15%, Ti: 0.7%, Al: 3.0%, Si: 0.5%, Mn: 0.5%, C: 0.1%, Fe: 45%, and the balance is Ni;

[0034] 2) Melting step: place the ceramic crucible and prepared raw materials in a vacuum melting furnace at the same time, and use a vacuum induction furnace at a vacuum degree not higher than 1.0×10 -4 Under MPa, the prepared alloy is smelted into alloy mother liquor, and when the alloy mother liquor is solidified, an electric arc is used to preheat the ceramic crucible at low power. After the alloy is completely solidified into an ingot, it is moved to a preheated ceramic crucible to prevent the alloy ingot from contactin...

Embodiment 2

[0040]The high-strength and corrosion-resistant iron-nickel-based superalloy of this embodiment comprises: Cr: 15%, Ti: 0.7%, Al: 3.0%, Si: 0.5%, Mn: 0.5%, Cu: 3.0%, C : 0.1%, Fe: 45%, the balance is Ni;

[0041] The preparation method of the present embodiment comprises the following steps:

[0042] 1) Raw material preparation: The ingredients include by mass percentage: Cr: 15%, Ti: 0.7%, Al: 3.0%, Si: 0.5%, Mn: 0.5%, Cu: 3.0%, C: 0.1%, Fe: 45% %, the balance is Ni;

[0043] 2) Melting step: place the ceramic crucible and prepared raw materials in a vacuum melting furnace at the same time, and use a vacuum induction furnace at a vacuum degree not higher than 1.0×10 -4 Under MPa, the prepared alloy is smelted into alloy mother liquor, and when the alloy mother liquor is solidified, an electric arc is used to preheat the ceramic crucible at low power. After the alloy is completely solidified into an ingot, it is moved to a preheated ceramic crucible to prevent the alloy ing...

Embodiment 3

[0049] The high-strength and corrosion-resistant iron-nickel-based superalloy of this embodiment includes: Cr: 15%, Ti: 0.7%, Al: 3.0%, W: 1.0%, Si: 0.5%, Mn: 0.5%, C : 0.1%, Fe: 45%, the balance is Ni;

[0050] The preparation method of the present embodiment comprises the following steps:

[0051] 1) Raw material preparation: The ingredients include by mass percentage: Cr: 15%, Ti: 0.7%, Al: 3.0%, W: 1.0%, Si: 0.5%, Mn: 0.5%, C: 0.1%, Fe: 45% %, the balance is Ni;

[0052] 2) Melting step: place the ceramic crucible and prepared raw materials in a vacuum melting furnace at the same time, and use a vacuum induction furnace at a vacuum degree not higher than 1.0×10 -4 Under MPa, the prepared alloy is smelted into alloy mother liquor, and when the alloy mother liquor is solidified, an electric arc is used to preheat the ceramic crucible at low power. After the alloy is completely solidified into an ingot, it is moved to a preheated ceramic crucible to prevent the alloy ingot...

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Abstract

The invention discloses a high-strength corrosion-resistant iron-nickel-based high-temperature alloy and a preparation method of the high-strength corrosion-resistant iron-nickel-based high-temperature alloy. The alloy comprises, by mass, 15-18% of Cr, 0.5-1.0% of Ti, 3.0-3.5% of Al, 0-1.0% of W, 0-1.0% of Mo, 0.5% or less of Si, 0.5% or less of Mn, 0-3.5% of Cu, 0.07-0.1% of C, 42-50% of Fe and the balance Ni, wherein the sum of Ti and Al is smaller than 4.0. The prepared alloy is smelted into an alloy mother solution, refining is carried out by adopting an electroslag remelting process, cooling is carried out, and the alloy mother solution is solidified into an ingot; and hot rolling is carried out after homogenization treatment, and finally heat treatment is carried out. The novel iron-nickel-based high-temperature alloy has high Al and Ti contents, the high Al element content in the alloy also ensures that the alloy has excellent oxidation resistance, and the high Fe element content in the alloy also improves the machining performance of the alloy and reduces the cost of raw materials.

Description

technical field [0001] The invention belongs to the field of high-temperature alloy materials, and in particular relates to a high-strength, corrosion-resistant iron-nickel-based high-temperature alloy and a preparation method thereof. Background technique [0002] As my country's electricity demand continues to increase, energy shortages and environmental pollution problems have become increasingly prominent, and the need to develop high-efficiency, energy-saving, and environmentally friendly power generation methods has become increasingly urgent. Thermal power generation has been the most important power generation technology in my country for a long time, and improving the steam parameters of the unit is considered to be the most effective way to solve the above problems. A lot of practice in the past has shown that the service performance of key component materials is the most important factor restricting the improvement of steam parameters of boiler units. Thick-walle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C22C38/06C22C38/44C22C38/02C22C38/04C22C38/42C22C30/02C22C30/00C22C33/04C21D8/00
CPCC21D8/005C21D2211/001C21D2211/004C22C30/00C22C30/02C22C33/04C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50
Inventor 严靖博谷月峰袁勇鲁金涛黄锦阳周永莉杨征张醒兴
Owner CHINA HUANENG GRP CO LTD
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