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High-strength high-toughness antioxidant iron-nickel-based high-temperature alloy and preparation method thereof

A nickel-based superalloy, high-strength and high-toughness technology, applied in the field of high-strength, high-toughness, oxidation-resistant iron-nickel-based superalloy and its preparation, can solve problems such as limited increase in material cost, and improve resistance to steam oxidation and flue gas corrosion. , Excellent structural stability and anti-steam oxidation performance, the effect of improving lasting performance

Active Publication Date: 2020-04-03
HUANENG POWER INTERNATIONAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The new iron-nickel-based superalloy has a higher temperature bearing capacity than austenitic heat-resistant steel, and has good high-temperature performance, and the material cost is limited compared with high-grade austenitic heat-resistant steel (such as HR3C). The overall cost performance is high, and it is expected Applied to the key high-temperature components of 650°C ultra-supercritical units, but there is no mature iron-nickel-based superalloy system in the existing technology that can meet the requirements of 650°C units

Method used

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  • High-strength high-toughness antioxidant iron-nickel-based high-temperature alloy and preparation method thereof
  • High-strength high-toughness antioxidant iron-nickel-based high-temperature alloy and preparation method thereof
  • High-strength high-toughness antioxidant iron-nickel-based high-temperature alloy and preparation method thereof

Examples

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Embodiment 1

[0028] 1. Alloy composition

[0029] Table 1 provided the chemical composition of Example 1 of the present invention. Test alloy 1# is the iron-nickel base superalloy of embodiment 1 of the present invention, in order to compare with the highest austenitic heat-resistant steel Sanicro25 alloy (Sweden Sandvik company development) with the present temperature bearing capacity, also listed Sanicro25 in the table ingredients.

[0030] Table 1 Chemical composition (% by weight, balance being Ni) of embodiment 1 of the present invention and comparative example (Sanicro25)

[0031]

[0032]

[0033] 2. Alloy melting and thermal deformation

[0034] By weight percentage, Fe 35-45%, Cr 15-21%, Mo 0.5-1.4%, W 0.1-0.8%, Ti 1.8-2.5%, Al 0.8-2.5%, Mn≤1.0%, Nb≤0.1%, Co≤2%, Si≤0.05%, C0.03-0.10%, B0.001-0.005%, P≤0.01%, the balance is Ni, the weight percentage of Cr+Ni is more than 50%, the weight percentage of W+Mo It is 0.6-1.5%, added to the vacuum induction furnace for melting,...

Embodiment 2-9

[0055] The chemical compositions of the alloys described in Examples 2-9 of the present invention are shown in Table 5.

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Abstract

The invention discloses a high-strength high-toughness antioxidant iron-nickel-based high-temperature alloy and a preparation method thereof. The iron-nickel-based high-temperature alloy comprises thefollowing components in percentage by weight: 35-45% of Fe, 15-21% of Cr, 0.5-1.4% of Mo, 0.1-0.8% of W, 1.8-2.5% of Ti, 0.8-2.5% of Al, not greater than 1.0% of Mn, not greater than 0.1% of Nb, nottreater than 2% of Co, not greater than 0.05% of Si, 0.03-0.10% of C, 0.001-0.005% of B, not greater than 0.01% of P, and the balance Ni. The weight percentage of Cr + Ni is greater than 50%; and theweight percentage of W + Mo is 0.6-1.5%. The iron-nickel-based high-temperature alloy is high in endurance strength, high in impact toughness and excellent in steam oxidation resistance; a gamma' phase and M23C6 are main strengthening phases; and compared with the prior art, the iron-nickel-based high-temperature alloy is equivalent in machining performance and low in material cost, is more excellent in structure stability, high-temperature strength and impact toughness, and can be used for manufacturing such high-temperature parts as main steam pipes, headers and high-temperature section rotors of ultra-supercritical thermal power generating units of 650 DEG C or above.

Description

technical field [0001] The invention relates to the technical field of high-temperature metal structural materials, in particular to a high-strength, high-toughness, oxidation-resistant iron-nickel-based superalloy and a preparation method thereof. Background technique [0002] Coal-fired thermal power units provide more than 70% of domestic electricity, but domestic thermal power units have low average power generation efficiency and high energy consumption, and are the main emission sources of sulfur dioxide, nitride NOx, carbon dioxide and mercury. With the improvement of environmental protection requirements, it is necessary to significantly reduce and reduce the carbon dioxide emissions per unit of GDP. In the field of coal power, adopting high-parameter and large-capacity thermal power units is one of the most direct, economical and effective measures to realize the clean and efficient utilization of coal. At present, all developed countries in the world, China and In...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22F1/00
CPCC22C19/055C22C19/056C22C30/00C22C38/02C22C38/04C22C38/06C22C38/44C22C38/48C22C38/50C22C38/52C22C38/54C22F1/00
Inventor 袁勇张鹏严靖博周永莉尹宏飞党莹樱杨珍黄锦阳鲁金涛谷月峰
Owner HUANENG POWER INTERNATIONAL
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