High-temperature strength retention of Inconel 601 alloy

Inconel 601 is primarily valued for its excellent oxidation resistance and good strength retention at elevated temperatures, although it is not as strong as some nickel-based superalloys optimized for creep strength (e.g., Inconel 718, Waspaloy). Key points regarding its high-temperature strength retention:

– Inconel 601 is commonly used in continuous service up to 1100℃ (2012℃F) for oxidation-resistant components, and up to approximately 900–1000℃ (1650–1830℃F) for applications where some structural strength is still required.

– At 600℃ (1110℃F), the ultimate tensile strength (UTS) is typically around 650–750 MPa, with yield strength (YS) about 300–400 MPa.– At 800℃ (1470℃F), UTS decreases to roughly 400–500 MPa, YS to 200–300 MPa.

– At 1000℃ (1830℃F), UTS is approximately 150–250 MPa, YS around 80–150 MPa.

– Inconel 601 exhibits moderate creep strength compared to high-strength superalloys.– For example, at 800℃ and 100 MPa, the creep rupture life is typically in the range of 100–1000 hours, depending on heat treatment and grain size.

– At 900℃ and 50 MPa, rupture life may be on the order of 100–500 hours.

– The alloy relies on solid-solution strengthening from Cr, Fe, and Al, as well as some carbide precipitation (e.g., M₂₃C₆, M₇C₃) for strength.

– The high Cr and Al contents provide excellent oxidation resistance, allowing the material to maintain its integrity and some load-bearing capability at very high temperatures where many other alloys would rapidly degrade.

Inconel 601 is not the strongest nickel-based alloy at high temperatures, but it offers a good balance of strength, ductility, and exceptional oxidation resistance up to very high temperatures.

It is widely used for furnace components, heat exchangers, and other parts where resistance to high-temperature oxidation and corrosion is more critical than extreme creep strength.