ThePipingMart Blog Grades 800H Inconel Alloy (UNS N08800) – Properties, Uses and Composition

800H Inconel Alloy (UNS N08800) – Properties, Uses and Composition

Inconel 800H

UNS N08800 is a high-nickel and chromium alloy with excellent mechanical and physical properties. It also offers exceptional corrosion resistance and is widely used in industrial applications such as chemical processing, heat exchangers, nuclear reactors, turbine blades, and more. Let’s take a closer look at the composition, mechanical properties, physical properties, uses, and corrosion resistance of Inconel 800H.

Inconel 800H Composition

UNS N08800 is an alloy of about 76% nickel and 15-20% chromium by weight. Additionally, it may contain trace amounts of other elements, including iron (5-7%), manganese (1%), carbon (.05-.15%), silicon (.5%), aluminium (.5%-1%), titanium (.5%) and sulfur (0.015%). The trace elements give the alloy strength and durability.

Element Content (%)
Iron, Fe ≥39.5
Nickel, Ni 30-35
Chromium, Cr 19-23
Manganese, Mn ≤1.5
Others Remainder

Inconel 800H Mechanical Properties

The mechanical properties of Grade 800H are what make it attractive for industrial applications. This nickel-chromium alloy has an ultimate tensile strength of 95 ksi (655 MPa), yield strength of 45 ksi (310 MPa), elongation at breakage of 25%, hardness value between 200 HBW to 250 HBW (Brinell Hardness Value), modulus of elasticity 30 msd (200 GPa). It also has good fatigue strength and creep resistance. All these qualities make it ideal for use in high-temperature environments where other materials may not be suitable due to their reduced performance under pressure or intense temperature changes.

Properties Metric Imperial
Tensile strength(annealed) 600 MPa 87 ksi
Yield strength(annealed) 275 MPa 39.9 ksi
Elongation at Break 45% 45%

Inconel 800H Physical Properties

In addition to alloy 800H strong mechanical properties, this alloy also offers excellent physical properties such as thermal conductivity at 860 W/mK – 1020 W/mK, specific heat capacity at 0.107 J/gK – 0.110 J/gK, density at 8 g/cm3. Its melting point is around 1350°C – 1450°C. These qualities make it ideal for use in any application where temperatures can vary greatly from day to day, such as those found in chemical processing plants or power plants that produce electricity using steam turbines.

Properties Metric Imperial
Density 7.94 gm/cm3 0.287 lb/in3

Inconel 800H Equivalent

UNS N08800 AMS 5766 AMS 5871 ASTM B163 ASTM B366
ASTM B564 DIN 1.4876

Corrosion Resistance

In addition to 800H inconel alloy strong mechanical and physical properties, this nickel-chromium alloy offers excellent corrosion resistance due to its high nickel content.

Inconel 800H Uses

It makes it ideal for use in industries that require highly corrosive environments, such as petrochemical plants or offshore oil rigs where salt water or acidic compounds can cause damage to other materials over time. It is also used in nuclear reactors because it can handle higher radiation levels than most materials without being damaged or weakened by exposure. Other common uses include turbine blades for jet engines, exhaust systems for automobiles and motorcycles, heat exchangers for cooling systems, valves and fasteners for piping systems etc.


In conclusion, Inconel 800H is a highly versatile material that combines solid mechanical properties with excellent physical characteristics and outstanding corrosion resistance making it perfect for use in many different industrial applications ranging from chemical processing facilities to offshore oil rigs or even automotive exhaust systems! With all these advantages combined into one single material, there’s no wonder why so many businesses choose this nickel-chromium alloy when they need a reliable product that won’t let them down, no matter how challenging the environment might be! If you are looking for a reliable material that won’t let you down when faced with extreme temperatures or corrosive conditions, look no further than Inconel 800h!

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