Chemical Composition:
The chemical composition of Incoloy 800 and Incoloy 800H consists mainly of nickel, iron, and chromium. However, there is a difference in the content of carbon (C) and aluminum (Al) between the two. The carbon content of Incoloy 800 ranges from 005-0.1%, while the carbon content of Incoloy 800H ranges from 005-0.1% with an aluminium content range of 015-0.6%。These small differences in chemical composition can have a significant impact on the performance and application of an alloy.
2.Antioxidant Properties:
Incoloy 800 and Incoloy 800H have good oxidation resistance at high temperatures, which can form a dense oxide layer and prevent the erosion of oxidizing media. However, Incoloy 800H has better oxidation resistance at high temperatures because the addition of aluminum helps to improve the stability and adhesion of the oxide layer.
3.Creep resistance:
Both Incoloy 800 and Incoloy 800H have good creep resistance at high temperatures. Creep resistance is an important indicator of the shape stability of a material under high temperature and stress conditions. Due to the higher carbon content of Incoloy 800H, it has better creep resistance at high temperatures, and is able to withstand higher stress and deformation without plastic deformation and failure.
4.Mechanical Properties:
Incoloy 800 and Incoloy 800H have similar mechanical properties, including strength, hardness, and ductility. Both have good plasticity and toughness, and can maintain good mechanical properties under high and low temperature conditions. However, Incoloy 800H has higher strength and hardness due to its higher carbon content.
Incoloy800H Nickel Alloy Chemical Composition:
Name: Incoloy800H Nickel Alloy UNS Incoloy800H Nickel Alloy Main Composition: Carbon(C) 008, manganese (mn) 175, Nickel (Ni) 72, Silicon (Si) 01 phosphorus (p) 008, sulfur (s) 007, chromium (cr) 141～17.7, iron (Fe) 67～10.0, aluminum(al) 03. Titanium(Ti) 03. Copper (Cu) 09. Creep resistance.
For loading conditions at high temperatures, material constants such as modulus of elasticity, Poisson's ratio, linear expansion coefficient, etc., change during heating, cooling, or high temperatures. The total strain at this time consists of elastic strain, creep strain, and temperature difference strain [2]. If there is a crack in the component, a high stress concentration will be generated at the crack tip, and the failure of the component will be significantly accelerated. Therefore, the generation of cracks in the components must be strictly controlled during the construction process. Creep strength is one of the essential properties of high-temperature materials. Incoloy 800H alloy has a high nickel content and good thermal stability, so its creep strength is higher than that of austenitic stainless steel at high temperatures above 650.
Incoloy 800H alloy is an iron-nickel-chromium alloy with moderate strength and good oxidation and carburizing resistance at high temperatures. It is particularly suitable for high-temperature equipment in the petrochemical industry, as the alloy does not form a brittle phase after long-term exposure at 1200°F (649°C). Excellent resistance to chloride stress corrosion cracking is another important property of Alloy 800. After solution heat treatment (2100°F 1150°C), Alloy 800H is a controlled carbon version of Alloy 800 with improved high-temperature performance. It improves creep and stress fracture characteristics in the temperature range of 1100°F (593°C) to 1800°F (982°C).
Incoloy 800 is primarily used in applications with temperatures up to 1100°F, while 800H and 800HT alloys are typically used in applications where temperatures above 1100°F and creep and fracture resistance are required. The chemical equilibrium gives nickel steel alloys excellent resistance to carburizing, oxidation, and nitriding atmospheres. Incoloy 800HT does not become brittle even with prolonged use in the range of 1200-1600°F, but many stainless steels can become brittle. 800HT exhibits excellent cold forming characteristics typically associated with nichrome alloys. When cold forming over a large area, the grain size creates a distinctly undulating surface called "orange peel". Incoloy 800HT can be welded by techniques commonly used on stainless steel.
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