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What is Inconel 800?
Inconel 800 is an passable performance alloy of iron (30-35%) and nickel and additions of small Cr (19-23%) fellow elements like Al,Ti etc. It is one super alloy member of the Inconel family. Outstanding strength in every respect, together with unmatched tolerance to corrosion and oxidation--especially at high temperatures.
High Temperature Resistance: Designed to maintain given characteristics of strength even at temperatures up to 1,600°F (870°C), Inconel 800 is a material that is suited for use in places where resistance to heat is crucial.
The Cr content in Inconel 800 provides excellent oxidation and carbonate resistances for both high temperature air as well as demanding industrial environments such chemical plants with a refining. Mechanical properties-Still has good mechanical strength with higher than normal resistance to thermal fatigue at any temperature. It is able to withstand chloride stress corrosion cracking.
Definition of Inconel 800
General Composition: 30-35% Nickel, 19-23% Chromium Balance Iron Inconel 800 is a nickel chromium-iron alloy known for great oxidation, carburization and corrosion resistance at high temperatures. It retains strength and stability when high temperatures are involved, including heat, pressure, or in corrosive environments. Common usage for Inconel 800 is in chemical processing, power generation, heat treating, where it provides its ability to perform under the conditions of high-temperature service up to about 1,600°F (870°C).
Machinability of Inconel 800
At high temperatures, the nickel-chromium alloy Inconel 800 is mainly used in high temperature applications, especially the chemical, petroleum and airplane manufacturing industries. It has tremendous oxidation resistance, as well as good strength after heating up. Because of its material properties though, Inconel 800 makes machining difficult. Let’s look at the machinability of a specific alloy called iron Inconel.
Hardness and Toughness:
Hardness:
The hardness of Inconel 800 is relatively high and more so at higher temperature, hence it is tougher than many materials to machine.
Toughness it is very hard, meaning it is not easy to crack at stresses. In service, although useful, it is tougher to cut as it does not easily form sharp cutting edges.
Cutting Forces:
The high strength and toughness of the alloy result in increased cutting forces during machining. This requires more powerful and stable machines to handle the stresses involved.
This makes tools wear out pretty quickly, which can increase the need for tool changes or re-sharpening.
Heat Generation:
Inconel 800 also has a low coefficient of thermal conductivity, implying that the heat formed during cutting cannot readily be lost, thus high cutting edge temperature results; this subsequently causes tool wear and bad surface finish.
The chip formation also can be erratic without proper management, leading to poor surface integrity.
Tool Wear:
The tool life is typically very low while machining Inconel 800. Tools recommended are carbide or ceramic; both hard and wear-resistant. Even with these, a large tool wear can occur due to the high temperatures and stresses involved. Coated tools like TiN, TiAlN or CVD coatings are useful for this by gaining less and transference friction and, at the same time, improving heat resistance.
Chemical Composition Inconel 800
| Element | Iron, Fe | Nickel, Ni | Chromium, Cr | Manganese, Mn | Others |
|---|---|---|---|---|---|
| Content (%) | ≥39.5 | 30-35 | 19-23 | ≤1.5 | Remainder |
Conclusion of Inconel 800
Inconel 800 is a very versatile and reliable nickel-chromium-iron alloy that is excellent in environments exposed to high temperatures, oxidation, and corrosion. It resists oxidation, carburization, and sulphur contamination, and thus, it is widely used as a material in heat exchangers, furnace components, chemical processing equipment, and nuclear reactors.