ThePipingMart Blog Products Aluminum 1100 Flanges – Composition, Properties, and Uses

Aluminum 1100 Flanges – Composition, Properties, and Uses

Aluminum 1100 Flanges

Aluminum 1100 is a popular material for many applications, and its flanges are especially desirable in various industries. These flanges are known for their exceptional properties and are widely used in diverse industries such as food processing, petrochemicals, chemical processing, aerospace, and marine. This blog will extensively discuss the composition, physical and mechanical properties, heat treatment, corrosion resistance, and uses of Aluminum 1100 flanges.

What is Aluminum 1100 Flanges?

Aluminum 1100 Flanges are pipe fittings made from an aluminum alloy containing 99.6% minimum aluminum. They are corrosion-resistant, lightweight and non-magnetic, making them ideal for plumbing fixtures or industrial applications requiring strength and durability.

Aluminum 1100 Flanges Composition

UNS A91100 flanges comprise 99% aluminum and trace amounts of other elements like iron, copper and silicon. The composition of these flanges gives them a high degree of thermal and electrical conductivity. These flanges possess excellent formability and weldability. The trace amount of iron and copper enhances their machinability, while the small amount of silicon gives the flanges a better surface finish.

Alloy Fe Si Mg Mn Cu Zn Ti Cr Others AI
1100 (min) 0.35 0.25 0.01 0.01 0.05 0.01 0.020 Trace 0.05 (each) 99.60%
1100 (max) 0.50 0.35 0.03 0.05 0.20 0.05 0.030 Trace 0.15 (total) remainder

Aluminum 1100 Flanges Physical Properties

The physical properties of 1100 Aluminum flanges are unmatched. They have a 2.70 grams per cubic centimeter density, making them lightweight and easy to handle. In addition, these flanges possess excellent thermal conductivity, meaning they can transfer heat quickly and efficiently. They also have a low melting point, making them easy to work with in fabrication processes.

Aluminum 1100 Flanges Mechanical Properties

Al 1100 flanges also possess excellent mechanical properties; they have a high yield strength of 71Mpa and tensile strength of 95-135Mpa. These flanges are also incredibly ductile and flexible, which can bend and deform without losing strength. They have a hardness rating of 23 Brinell, comparable to 5083 aluminum.

Alloy Temper UTS(Mpa) % Elongation
Min Max 0.5 mm -0.8 mm 0.81 mm – 1.30 mm 1.30 mm – above
1100 O 75 110 20 25 29
H12 95 130 5 6 7
H14 110 145 3 4 5
H16 130 165 2 3 4
H18 150 2 2 3

Aluminum 1100 Flanges Equivalent

UNS USA Japan France ISO
A91100 AA1100 JIS A1100P NF 1100 Al 99.0 Cu.

Aluminum 1100 Flanges Heat Treatment

1100 AL flanges can be heat-treated to significantly improve their mechanical properties. The heat treatment process called annealing improves its toughness and enhances its ductility. Annealing of Aluminum 1100 flanges occurs at 345 degrees Celsius for one hour, and then the material is cooled in air. This treatment also benefits the machinability of the flange.

Aluminum 1100 Flanges Corrosion Resistance

Aluminum 1100 flanges have excellent corrosion resistance. They have a natural oxide layer that builds up over time, which creates a barrier against environmental factors such as moisture and chemicals. This oxide layer is why Aluminum 1100 flanges are popularly used in the aerospace industry, marine applications and chemical processing methods, where exposure to external elements like water and chemicals can have detrimental effects.

Aluminum 1100 Flanges Uses

Aluminum 1100 flanges are widely used in various industries due to their high strength, ductility, and corrosion resistance. They are used in pressure vessels, chemical and petrochemical industries, evaporators, marine applications, heat exchangers, and food processing plants. They are also used in the creation of HVAC systems and the manufacturing of different types of cooking utensils and electronic components.



Aluminum 1100 flanges are an incredibly versatile material with exceptional properties. They have excellent thermal and mechanical properties, can resist corrosion and are lightweight. They can also be heat-treated to further enhance their characteristics, and they are used in different industries for a wide range of applications, from aerospace to food processing. For these reasons, Aluminum 1100 flanges are becoming increasingly popular across industries.

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