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Inconel alloys are resistant to oxidation and corrosion, making them suitable for harsh environments under high temperature and high pressure. When the Inconel alloy is heated, a thick and stable oxide layer will be passivated on the surface of the alloy to protect the inside of the alloy from corrosion. Inconel alloys can maintain good mechanical properties over a wide temperature range, which is beyond the reach of common engineering metals such as steel and aluminum.
Depending on the model, Inconel alloys maintain good mechanical properties at high temperatures by means of solid solution strengthening or precipitation hardening. Inconel alloys are commonly used for high temperature applications. In engineering, it is sometimes referred to as "Inco".
Common Inconel grades include: Inconel 625, Inconel 600, Inconel 601, Inconel 601GC, Inconel 617, Inconel 686, Inconel 690, Inconel 718, Inconel 725, Inconel X50-74, etc.
Inconel 600 is a solid solution strengthened heat and corrosion resistant alloy with good high temperature corrosion resistance, oxidation resistance, cold and hot processing properties, low temperature mechanical properties, and hot and cold fatigue properties. It has the characteristics of high strength below 650°C, good formability, easy welding, etc. It is suitable for heat treatment and chemical processing industrial equipment.
Inconel 601 has excellent high temperature oxidation resistance, good carbonization resistance, good oxidation resistance to sulfur-containing atmosphere, good room temperature and high temperature mechanical properties, good stress corrosion cracking resistance due to control of carbon content and grain size. Inconel 601 has high creep rupture strength and is suitable for applications above 500 °C.
The Inconel 601GC is the grain-controlled version of the Inconel 601.
Inconel 617 is a nickel-chromium-cobalt-molybdenum alloy with excellent mechanical properties at high temperatures. The alloy also exhibits high temperature corrosion resistance such as oxidation and carbonization.
Inconel 625 has good corrosion and oxidation resistance, good tensile and fatigue properties from low temperature to 980°C, and stress corrosion resistance in salt atmosphere.
Inconel 686 is a low carbon nickel chromium molybdenum tungsten alloy with significant resistance to general corrosion, stress corrosion cracking, pitting and crevice corrosion, oxidation, reduction and mixed acids. It also exhibits significant corrosion resistance in environments containing halides. In addition, Inconel 686 is resistant to seawater and other marine environments and is widely used in chemical production, marine, air pollution control (flue gas desulfurization) industries, pulp and paper industry and waste management.
Inconel 690 is resistant to chloride corrosion, high temperature and high pressure water stress corrosion, strong oxidizing media and HNO2-HF mixed corrosion. This alloy is commonly used in nuclear waste treatment plants, steam generators and nitric acid-resistant parts.
Inconel 718 is a precipitation hardening Ni-Cr-Fe alloy with the addition of niobium and molybdenum. It has high strength and good toughness at temperatures below 650°C. Inconel 718 exhibits corrosion resistance in both low and high temperature environments. The delivery state can be solution treated or precipitation hardened.
Inconel 725 is a nickel-chromium-molybdenum-niobium alloy with excellent corrosion and stress corrosion resistance properties. Aging heat treatment can greatly improve the strength, ductility and tensile strength of the alloy.
Inconel 740H is age hardened by precipitation of gamma primary and secondary phases. After age strengthening, the 740H alloy exhibits excellent high temperature strength at temperatures below 850 °C. Alloy 740H contains high levels of chromium and cobalt, and has excellent resistance to oxidation, carbonization, and sulfidation at high temperatures.
Inconel X-750 has good corrosion and oxidation resistance and good strength up to 980°C. In addition, Inconel X-750 also has good low temperature properties and formability, mainly used as aerospace and industrial gas turbine components.
Inconel 751 is a precipitation-hardening superalloy similar to Alloy 750, with good wear resistance, strength and corrosion resistance, and hot hardness at high temperatures, mainly used in internal combustion engine exhaust valves.
Inconel 783 is an oxidation resistant superalloy with a low coefficient of thermal expansion specially developed for turbine applications. After adding niobium and aluminum, the strength of alloy 783 can be enhanced by precipitation hardening heat treatment. In addition, the aluminum contained in it gives it excellent resistance to oxidation at high temperatures. Alloy 783 is about 5% less dense than superalloy 718.
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