ThePipingMart Blog Grades Alloy AL 800H (UNS N08810) – Composition, Properties, and Uses

Alloy AL 800H (UNS N08810) – Composition, Properties, and Uses

Alloy AL 800H

Alloy AL 800H is a high heat-resistant nickel-iron-chromium alloy that has become increasingly popular recently. This alloy has a unique composition that offers increased strength, excellent corrosion resistance, and good thermal stability. Alloy AL 800H is perfect for use in high-temperature environments where other materials may be degraded due to thermal stresses.

Alloy AL 800H Composition

Alloy AL 800H has a copy of 32-38% Ni, 19-23% Cr, 0.75% max Mn, 0.5% max Si, 0.015% max C, 0.15-0.60% Al, 0.15% max Ti, 0.1% max Fe, and 0.75% max Cu. The high nickel and chromium content in Alloy AL 800H makes it resistant to high-temperature oxidation and carburization, which makes it perfect for use in furnaces and chemical processing environments.

Element Content (%)
Iron, Fe 44
Nickel, Ni 32
Chromium, Cr 21
Manganese, Mn 1
Aluminum, Al 0.4
Titanium, Ti 0.4
Silicon, Si 0.35
Copper, Cu 0.3
Carbon, C 0.08
Phosphorous, P 0.02
Sulfur, S 0.01

Alloy AL 800H Mechanical Properties

Alloy AL 800H has excellent mechanical properties that suit high-stress applications. It has a tensile strength of 550 MPa, yield strength of 250 MPa, and an elongation at a break of 35%. Because of its high-temperature strength and excellent resistance to thermal fatigue, Alloy AL 800H is commonly used in constructing pressure tubes, heat exchangers, and other related applications.

Properties Metric Imperial
Tensile strength (typical annealed at 1149°C/2100°F) 531MPa 77000 psi
Yield strength (typical annealed at 1149°C/2100°F, @strain 0.200%) 200 MPa 29000 psi
Elongation at break (typical annealed at 1149°C/2100°F, in 2″) 52% 52%
Hardness, Rockwell B (typical annealed) 70 70

Alloy AL 800H Physical Properties

Alloy AL 800H has unique physical properties due to its chemical composition. It has a density of 7.95 g/cm³, a melting point of 1370-1400°C, and a specific heat capacity of 0.11 cal/g-K. These properties make it perfect for furnace muffles, components, and radiant tubes.

Properties Metric Imperial
Density 8.08 g/cm³ 0.292 lb/in³
Melting point 1371°C 2500°F

Alloy AL 800H Equivalents

ASTM B514 ASTM B564 DIN 1.4876 DIN 1.4958

Alloy AL 800H Uses

Alloy AL 800H is used in various applications across different industries. It is commonly used in the chemical processing industry due to its excellent resistance to sulfidation and carburization. It is also used to construct furnace muffles, heat exchangers, pressure and radiant tubes. It also produces electronic components, such as thermocouples and resistance wires.

Alloy AL 800H Corrosion Resistance

Alloy AL 800H has excellent corrosion resistance, making it suitable for harsh environments. It is resistant to various chemicals and acids, such as sulfuric acid, hydrochloric acid, and nitric acid. It also offers excellent resistance to intergranular corrosion and stress corrosion cracking.

Alloy AL 800H Welding

Alloy AL 800H can be readily welded using welding techniques such as TIG, MIG, and submerged arc welding. However, its high nickel content requires additional welding precautions to prevent the material from cracking.


At the end of the day, alloy AL 800H is an excellent material for high-temperature applications that require excellent resistance to oxidation, carburization, and corrosion. Its unique composition and excellent mechanical and physical properties make it ideal for use in various industrial applications.

Whether you are in the chemical processing, construction, or electronic components industry, alloy AL 800H is the perfect material to make your products last longer, work harder and fair better in severe operating temperatures.

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