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Preparation and molding process of a high-strength nickel-cobalt-based alloy pipe

A nickel-cobalt-based alloy and forming technology, applied in the field of superalloys, can solve the problems of alloy processing performance, increase alloy red hardness, etc., achieve excellent high temperature strength properties, reduce adverse effects, and improve corrosion/oxidation resistance. Effect

Active Publication Date: 2021-05-25
CHINA HUANENG GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of the above elements will have a serious impact on the processing properties of the alloy. For example, the addition of W element increases the red hardness of the alloy, and the addition of Nb tends to promote the precipitation of harmful phases such as CrNbN at the grain boundary, etc.

Method used

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  • Preparation and molding process of a high-strength nickel-cobalt-based alloy pipe
  • Preparation and molding process of a high-strength nickel-cobalt-based alloy pipe
  • Preparation and molding process of a high-strength nickel-cobalt-based alloy pipe

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preparation example Construction

[0029] A preparation and molding process of a high-strength nickel-cobalt-based alloy pipe, including five steps of alloy smelting, homogenization treatment, pre-rolling treatment, high-temperature hot rolling, and heat treatment, specifically as follows:

[0030] 1) Alloy smelting: by mass percentage, take Cr: 17-20%, Co: 27-30%, Ti: 1.5-3.5%, Al: 3.0-4.5%, W: 3.0-9.0%, Mo: ≤1.0 %, Nb: 0.5~1.0%, Ta: ≤1.0%, Si: ≤0.5%, Mn: ≤0.5%, C: 0.04~0.07%, B: ≤0.003%, Zr: 0.01~0.03%, Hf: 0.05 ~0.15%, the balance is Ni;

[0031] Induction electric arc furnace is used for smelting, and the vacuum degree is controlled within the range of 0.3-0.5Pa. After Cr, Co, Ni, W, Nb and other elements are completely melted, it is refined for 0.5-1h, and Al, Ti, B, Zr and C, to obtain alloy ingots; wherein, when the alloy is smelted, the magnesium oxide basic furnace lining is used, the furnace is washed with pure nickel before smelting, and the alloy raw material is added before shot blasting;

[0032...

Embodiment 1

[0039] According to the alloy composition, the content of each element meets the following requirements by mass percentage: Cr: 17%, Co: 28%, Ti: 1.5%, Al: 4.5%, W: 9.0%, Nb: 1.0%, Si: 0.15 %, Mn: 0.2%, C: 0.07%, B: 0.003%, Zr: 0.02%, Hf: 0.1%, and the balance is Ni. Alloy smelting adopts magnesium oxide basic furnace lining, and pure nickel is used to wash the furnace before smelting, and shot blasting is carried out before alloy raw materials are added. The alloy is smelted in an induction arc furnace, and the vacuum degree is controlled at 0.35Pa. After Cr, Co, Ni, W, Nb and other elements are completely melted, it is refined for 40 minutes, and high-purity Argon protection;

[0040] Heat the alloy ingot at a rate of 10°C / min to 950°C and keep it warm for 0.5 hours, then continue to heat up and perform continuous homogenization treatment at 10, 30, and 50°C above the γ' solid solution temperature for 12, 12, and 24 hours, and air cool after completion to room temperature....

Embodiment 2

[0043] According to the alloy composition, the content of each element meets the following requirements by mass percentage: Cr: 18%, Co: 30%, Ti: 3.5%, Al: 3.5%, W: 3.0%, Nb: 1.0%, Ta: 1.0 %, Si: 0.15%, Mn: 0.25%, C: 0.07%, B: 0.002%, Zr: 0.03%, Hf: 0.1%, and the balance is Ni. Alloy smelting adopts magnesium oxide basic furnace lining, and pure nickel is used to wash the furnace before smelting, and shot blasting is carried out before alloy raw materials are added. The alloy is smelted in an induction arc furnace, and the vacuum degree is controlled at 0.35Pa. After Cr, Co, Ni, W, Nb and other elements are completely melted, it is refined for 40 minutes, and high-purity Argon protection;

[0044] Heat the alloy ingot at a rate of 10°C / min to 950°C and keep it warm for 0.5 hours, then continue to heat up and perform continuous homogenization treatment at 10, 30, and 50°C above the γ' solid solution temperature for 12, 12, and 24 hours, and air cool after completion to room t...

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Abstract

A preparation and molding process of a high-strength nickel-cobalt-based alloy pipe, comprising: Cr: 17-20%, Co: 27-30%, Ti: 1.5-3.5%, Al: 3.0-4.5%, W: 3.0 ~9.0%, Mo: ≤1.0%, Nb: 0.5~1.0%, Ta: ≤1.0%, Si: ≤0.5%, Mn: ≤0.5%, C: 0.04~0.07%, B: ≤0.003%, Zr: 0.01~0.03%, Hf: 0.05~0.15%, the balance is Ni; the alloy is homogenized after smelting, hot rolled, and finally heat treated. The alloy of the invention has very high high-temperature strength performance, and the compressive yield strength of the as-cast alloy at 1160°C and 1180°C after solid solution treatment is not less than 110MPa and 100MPa respectively.

Description

technical field [0001] The invention belongs to the field of high-temperature alloys, and specifically relates to a preparation and molding process of high-strength nickel-cobalt-based alloy pipes, and is especially suitable for high-temperature key components such as over / reheater pipes of advanced ultra-supercritical units of thermal power plants. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C30/00C22C1/02C22F1/00C22F1/10
CPCC22C1/02C22C1/023C22C19/055C22C30/00C22F1/00C22F1/10
Inventor 严靖博杨征张醒兴谷月峰袁勇黄锦阳
Owner CHINA HUANENG GRP CO LTD
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