ThePipingMart Blog Grades 1100 Aluminium Alloy (UNS A91100) – Composition, Properties, and Uses

1100 Aluminium Alloy (UNS A91100) – Composition, Properties, and Uses

Aluminium 1100

Aluminium 1100 (Al1100) is an aluminium alloy with excellent workability, weldability, and corrosion resistance. It has various applications in the engineering, automotive, and construction industries. This blog post will provide a comprehensive overview of the composition, physical properties, mechanical properties, heat treatment, and welding of Al1100.

What Forms is Aluminium 1100 Available at Piping Mart?

  • Aluminium 1100 Pipes
  • Aluminium 1100 Tubing
  • Aluminium 1100 Plates
  • Aluminium 1100 Angle
  • Aluminium 1100 Wires
  • Aluminium 1100 Flanges
  • Aluminium 1100 Coils
  • Aluminium 1100 Sheet
  • Aluminium 1100 Foil
  • Aluminium 1100 Bars
  • Aluminium 1100 Flanges
  • Aluminium 1100 Forging

Aluminium 1100 Chemical Composition

The chemical compositions for Al1100 are as follows: Cu 0.2-0.6%, Fe ≤0.4%, Mn ≤0.15%, Si ≤0.4%, Ti ≤0.15%. These chemical elements are present to improve the strength and formability of this alloy without significantly increasing its cost or complexity during manufacturing processes like welding or machining.

Element Content (%)
Aluminium / Aluminum , Al 99.00 (min)
Copper , Cu 0.12

Aluminium 1100 Physical Properties

The physical properties of Al1100 include a density of 2.7 g/cm3 and a melting point range between 520°C – 575°C (973°F – 1067°F).

Properties Metric Imperial
Density 2.71 g/cm3 0.0979 lb/in³

Aluminium 1100 Mechanical Properties

The mechanical properties of this alloy include a tensile strength range between 35-45 KSI (241-310 MPa), an elongation range between 15%-25% and a yield strength range between 25-35 KSI (172-241 MPa). These physical and mechanical properties make Al1100 suitable for applications requiring good formability, high strength, good weldability and excellent corrosion resistance.

Properties Conditions
T (°C) Treatment
Density (x1000 kg/m2) 2.71 25
Poisson’s Ratio 0.33 25
Elastic Modulus (GPa) 70-80 25
Tensile Strength (Mpa) 110 25 H12
Yield Strength (Mpa) 105
Elongation (%) 12
Reduction in Area (%)
Hardness (HB500) 28 25 H12
Shear Strength (MPa) 69 25 H12
Fatigue Strength 41 25 H12

Aluminium 1100 Chemical properties

Aluminium 1100 is a commercially pure aluminium with numerous chemical properties that make it a valuable asset to industries. Even though it is soft and ductile in its pure form, aluminium 1100 can increase its strength by adding other metals or cold working. It has excellent resistance to corrosion and moisture, making it the ideal choice when reducing maintenance costs. Due to the chemical properties retained during welding, complex structures can be formed from aluminium 1100, allowing for greater design freedom. Many companies worldwide choose aluminium 1100 due to its ease of use, cost efficiency and durable nature.

Al 1100 Thermal Conductivity

Properties Conditions
T (°C) Treatment
Thermal Expansion (10 -6/C°) 23.6 25
Thermal Conductivity (W/m-K) 218 25 H18

Aluminium 1100 Equivalent

Equivalent materials to Aluminium / Aluminum 1100 alloy are as follows.

AMS 4003 AMS 7220 ASTM B209 ASTM B210 ASTM B211 ASTM B221
ASME SFA5.10 (ER1100) ASME SFA5.3 (E1100) ASTM B241 ASTM B247 ASTM B313 ASTM B316
ASTM B548 MIL A-52174 MIL A-52177 MIL C-26094 MIL R-5674 MIL S-24149/5
AWS A5.10 (ER1100) AWS A5.10 (ER1100) AWS A5.3 (E1100) MIL E15597 (MIL-1100) MIL I-23413 (MIL-1100) QQ WW-T-700/1
MIL W-6712 MIL W-85 QQ A-1876 QQ A-1876 QQ A-250/1 QQ A-430
SAE J454

Aluminium 1100 Specifications

USA: AA1100; Japan: JIS A1100P: France: NF 1100; ISO Al 99.0 Cu.
The properties in this data sheet meet Australian/New Zealand Standard AS/NZS 1734:1997
Aluminium and aluminium alloys – Flat sheet, coiled sheet and plate (equivalent to BS EN
573-1).The material also meets other national standards

Heat Treatment

UNS A91100 can be heat treated to further increase its strength without sacrificing much formability; however, it should be noted that this process somewhat decreases its corrosion resistance. Other heat treatments can also be used on this material, including age hardening or precipitation hardening treatments depending on the application requirements; however, these processes are often more complex than simple heat treatment methods due to their higher cost and setup times required for successful completion.

Corrosion Resistance

Additionally, although some corrosion resistance loss occurs after heat treatment processes have been completed – especially age hardening – this alloy still maintains good levels of protection against oxidation effects due to its high chromium content at 0.2%.


Machining UNS A91100 is relatively easy due to its softness; however, care must still be taken when performing operations such as drilling or tapping, as breakages can still occur if too much force is applied during these processes.

Heat Resistance

Additionally, since it has low thermal conductivity, it’s important to use cutting fluids whenever possible when machining aluminium alloys to reduce wear on your tools while increasing productivity by cooling down your cutting edges during operation periods where extended times may otherwise lead to tool failure or poor surface finishes on your parts being machined from this material type. Finally, this material also offers excellent heat-resistant capabilities, making it suitable for high-temperature applications where other materials cannot withstand extreme temperatures without deformation.

Aluminium 1100 Applications

UNS A91100 is the most popular grade of aluminium for many industries. It has excellent corrosion resistance and good formability, making it an ideal material for many purposes. Aluminium 1100 can be utilized in chemical equipment, transportation products, food handling and storage components, architectural panels, fabrications and heat exchangers. Its strength and forming capabilities are essential to produce lightweight designs that surpass other materials in mechanical performance. This versatility makes Aluminium 1100 a vital part of modern industry and culture.

  • Aluminium 1100 is a soft, non-heat-treatable alloy that is easy to weld and form.
  • It is often used in electrical applications because it has high electrical conductivity and can be easily drawn into wire.
  • Aluminium 1100 is also frequently used in chemical applications because it is resistant to corrosion.
  • Some common uses for aluminium 1100 include food packaging, kitchen utensils, and architectural applications.
  • Aluminium 1100 can also be used for jewellery, as it can be easily worked and polished to a high shine.
  • Aluminium 1100 is sometimes used in coinage, as it is non-reactive and does not tarnish quickly.
  • Aluminium 1100 is also used in constructing aircraft and spacecraft, as it is lightweight and strong.
  • This alloy is also commonly used in the manufacture of medical devices, as it does not cause an allergic reaction in patients.
  • Aluminium 1100 can also be found in many household items, such as window and door frames.

Welding Aluminium 1100

UNS A91100 can be easily welded using traditional techniques such as TIG or MIG welding. The most commonly used filler metal for this alloy is ER4043, which is an aluminium-silicon alloy that provides excellent corrosion resistance with very low levels of porosity when properly applied during welding operations. It should be noted that preheating is generally not required for this alloy due to its low melting point; however, it can still be beneficial for improving the quality of the welds produced from this material.


In conclusion, aluminium 1100 (Al1100) is an excellent choice for applications requiring good formability, high strength, weldability and corrosion resistance without compromising on cost or complexity during manufacturing processes such as welding or machining. Its composition allows it to take advantage of common traditional processing techniques like TIG or MIG welding while also providing additional options like age hardening or precipitation hardening if needed. Furthermore, it has great physical & mechanical properties, heat-treatable characteristics, is easy to machine & having great heat-resistant capabilities, making it suitable even in extreme temperature environments. All these factors combined make aluminium 1100 one of the best materials today!

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