Low-cost low-density nitrogen-containing low-nickel alloy and preparation method thereof

By adding N elements and other alloy elements to Inconel 625 alloy, low-cost, low-density nitrogen-containing low-nickel alloys are prepared, which solves the dual failure problem of existing nickel-based high-temperature alloys in high-temperature environments, and achieves excellent high-temperature mechanical properties and high-temperature corrosion resistance.

CN119685674APending Publication Date: 2025-03-25SHENYANG SHENGKE HAICHUANG TECH CO LTD
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Patent Information

Application Number
CN202411850403.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-16
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

It is difficult to effectively control the alloy density and reduce costs while ensuring strength. At the same time, there is a double failure problem of high-temperature stretching and high-temperature corrosion in high-temperature environments.

Method used

By adding N elements to the Inconel 625 alloy system, the content of Ni elements is reduced, and Mo, Mn, V, Ti, Al, Nb, Si, Cu elements are added for alloying, low-cost, low-density nitrogen-containing low-nickel alloy is prepared, and a combination of vacuum smelting and heat treatment is used to improve the high-temperature mechanical properties and high-temperature corrosion resistance of the alloy.

Benefits of technology

It achieves high-temperature tensile performance and high-temperature Cl-corrosion resistance that is better than Inconel 625 high-temperature alloy at 900°C, while reducing the density and cost of the alloy and improving the working efficiency and service life of the turbine blades.

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Abstract

The invention belongs to the technical field of alloy materials, and particularly relates to a low-cost low-density nitrogen-containing low-nickel alloy and a preparation method thereof, and the alloy comprises the following chemical components: 40.0-43.0 wt% of Ni, 20.0-23.0 wt% of Cr, 1.3-2.5 wt% of Mn, 0.3-0.5 wt% of Si, 1.0-6.0 wt% of Mo, 0.2 wt% or less of Cu, 0.40-0.55 wt% of N, 3.0 wt% of Ti and Al, and the balance of Fe and inevitable impurities. The alloy comprises the following components in percentage by weight: 1.0% of Ti / Al, 4.0-6.0% of Nb, 4.0-5.0% of W, 0.07-0.10% of V and the balance of Fe and inevitable impurities. The nitrogen-containing low-nickel alloy is subjected to high-temperature stretching at the temperature of 600 DEG C, 700 DEG C, 800 DEG C and 900 DEG C, and the tensile strength is 189 MPa; the high-temperature molten salt corrosion is carried out at the temperature of 900 DEG C, after corrosion is carried out for 60 h in 60 wt% MgCl2 and 40 wt% KCl molten salt, the corrosion weight loss is 3.556 mg, the corrosion rate is 8.65 mm / year, and the high-temperature-resistant Cl <-> corrosion performance is excellent.
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