Low-cost and high-strength oxidation-resistant iron-nickel based alloy and preparation method thereof

Abstract

The invention discloses a low-cost and high-strength oxidation-resistant iron-nickel based alloy and a preparation method thereof. The alloy is high in strength, has good high-temperature steam oxidation resistance at 650-700 DEG C, and is low in production cost and obvious in cost performance advantage. The alloy comprises the following chemical components of: C, Cr, Fe, Co, Mo, W, Al, Si, Ti andNi; and the content of the components is as follows: the content of C is smaller than 0.08% and greater than 0, the content of Cr is smaller than or equal to 18% and greater than or equal to 14%, thecontent of Fe is smaller than or equal to 48% and greater than or equal to 37%, the content of Al and Si is smaller than or equal to 3.0% and greater than or equal to 0.5%, the content of Ti is smaller than or equal to 2.2% and greater than or equal to 2%, the content of Co is smaller than or equal to 1.5%, the content of Mo and W is smaller than or equal to 1.5% and greater than or equal to 0.4%, and the balance is Ni. During steam oxidation of the alloy in a range of 650-700 DEG C, a compact oxide layer containing a chromium oxide/aluminum oxide double-layer structure is obtained through selective oxidation.

Description

technical field [0001] The invention relates to a high-iron-iron-nickel-based alloy, in particular to a low-cost, high-strength, anti-oxidation iron-nickel-based alloy and a preparation method thereof. Background technique [0002] In order to solve the rapidly increasing demand for electricity, the increasingly prominent energy shortage and environmental pollution problems, the future development trend of advanced coal-fired power generation technology is: in the mid-term development of 5-10 years, on the basis of the existing 600 ℃ units, through Adopt secondary reheating and increase the main steam temperature to increase the thermal efficiency by 2-3 percentage points; in the long-term development of 10-20 years, the 700°C unit will be put into demonstration operation, and its thermal efficiency will reach 52-55%. Since the nickel-based superalloy required for a 700-degree power plant requires high preparation technology, it is expensive, about 10 times the cost of auste...

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Problems solved by technology

These alloys are highly resistant to corrosion, but are difficult to machine, have poor weldability, and are expensive

In contrast, low-cost and easy-to-process Ni-Fe-based alloys such as GH2984 do not meet the corrosion resistance requirements even tho

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