ThePipingMart Blog Grades Aluminium 4543 Alloy (UNS A94043) – Composition, Properties and Uses

Aluminium 4543 Alloy (UNS A94043) – Composition, Properties and Uses

Aluminium 4543

Aluminum 4543 is a highly versatile alloy with an extensive range of uses. It is often used in the construction and automotive industries and for electrical applications. It has excellent corrosion resistance and heat resistance, making it an ideal choice for many projects. Let’s take a closer look at Aluminium 4543 composition, physical properties, mechanical properties, uses, corrosion resistance, heat resistance, heat treatment, machining, and welding.

Aluminium 4543 Composition

Al 4543 is a wrought aluminum-magnesium-silicon alloy with 4% magnesium and 0.3% silicon. This combination makes it very strong while keeping it lightweight and durable. Additionally, its high ductility makes it easily form into complex shapes without cracking or breaking.

Element Content (%)
Aluminum, Al 94.8
Silicon, Si 5.20

Aluminium 4543 Mechanical Properties

Grade 4543 has excellent mechanical properties, including a good strength-to-weight ratio and high fatigue strength. It also has excellent impact strength even at low temperatures, making it ideal for applications where cold temperature performance is needed, such as refrigerators and freezers. Additionally, this alloy offers good creep resistance, which makes it suitable for high-pressure systems such as hydraulic cylinders and valves.

Properties Metric Imperial
Tensile strength 145 MPa 21000 psi
Yield strength (@diameter 12.7 mm/0.500 in) 70 MPa 10200 psi
Poisson’s ratio 0.34 0.34
Elongation at break (@diameter 12.7 mm/0.500 in) 22% 22%
Shear strength 90 MPa 13100 psi
Hardness, Brinell (@load 500 kg; thickness 10.0 mm/1100 lb) 39 39

Aluminium 4543 Physical Properties

Alloy 4543 has good electrical conductivity making it suitable for use in electrical components such as switchgear and control systems. Its thermal conductivity allows for the efficient transfer of heat from the core of the material to the environment allowing it to be used in cooling systems or heat exchangers, which require efficient thermal conductivity properties. Finally, its low density makes it lighter than other alloys making it ideal for use in lightweight structures such as aircraft components or automobile parts where lower weight is desired without sacrificing strength or durability.

Properties Metric Imperial
Density 2.69 g/cm3 0.0972 lb/in3

Thermal Properties

Properties Metric Imperial
Thermal expansion co-efficient (average over 20-100°C/68-212°F) 22.1 µm/m°C 12.3 µin/in°F
Thermal conductivity 163 W/mK 1130 BTU in/hr.ft².°F


  • BS N21
  • MIL-W-6712
  • Alcan GB-33S
  • Duricilium-FD
  • Star-Si-050
  • AWCO-45


4543 Aluminum is a versatile alloy often used for structural components in several industries. Its high strength-to-weight ratio, weldability, and toughness make this alloy a perfect fit for automotive parts and aircraft structures. It can also withstand shock loads, making it ideal for sports equipment and power tools. Additionally, this alloy is popular for marine applications because of its corrosion resistance properties, especially when exposed to saltwater or salt spray in coastal environments. Finally, Aluminium 4543 also has aesthetical value – its polished finish provides an attractive look that often appeals to consumers. Altogether, it’s easy to understand why Aluminum 4543 enjoys widespread use across many sectors.

Corrosion Resistance

Aluminum 4543 is a highly corrosion-resistant alloy. Long-lasting and durable, it is particularly beneficial in applications that require it to be exposed to the elements since its outer surface creates the perfect barrier against water and oxygen. It’s also used in highly corrosive environments because of its unique corrosion resistance capabilities, which makes it an ideal choice for cost-effective components. With a significantly lower life cycle cost than other materials, aluminium 4543 is an excellent option for preserving long-term structural integrity and security.

Heat Resistance

Aluminum 4543 provides great heat resistance for many industries, making it an excellent choice for many applications. Its ability to retain its form and resist corrosion at high temperatures makes it ideal for use in production lines, motors, and extruded shapes. Its good conductivity and lightweight properties provide efficiency and strength that other metals can’t achieve. When combined with its non-magnetic properties, Aluminium 4543 is the perfect material solution for a variety of needs across industries.

Heat Treatment

Aluminium 4543 is renowned for its unique thermal properties, making it ideal for many applications. But like any material, if it is to be used correctly, it must first undergo heat treatment. Thermal treatment consists of heating, cooling and heat ageing the aluminium 4543 alloy at precisely controlled temperatures and times to increase tensile strength and corrosion resistance while preserving microstructural stability. Through this process, the strength of the alloy increases and all potential internal flaws become evident. With proper heat treating, aluminium 4543 can be used safely in most applications with confidence in its structural integrity.


Machining aluminium 4543 requires a precise hand. This lightweight yet the strong metal is used in many different industries, from aerospace to automotive, making it a versatile material for machining. To ensure successful production and high-quality parts, it is essential to be aware of the properties of aluminum 4543. Its high hardness and strength make it more difficult to work with than other types of aluminium. Specialized cutting tools such as carbide insert cutters need to be employed when dealing with such demanding materials. Proper operation of the machine can also make a difference when machining this type of aluminum; techniques such as keeping appropriate feed and speed rates and avoiding sharp peaks/dips on tool paths are key elements for achieving desired accuracy and finishing quality.


Aluminum 4543 welding is a specialized welding process that requires experience and expertise. This type of delicate welding puts higher demands on the joint, as it depends on taking advantage of the aluminium alloy’s anti-corrosion properties and high strength-to-weight ratio. Clean breaks and no elongation characterize the ideal welds. With anodizing, Aluminum 4543 can be polished to show a beautiful silver sheen when finished. Welders must follow safety precautions to protect themselves from dangerous gas exposure during the welding process. In addition, different characteristics such as temperature and speed play a role in optimal weld performance for any aluminium alloy. Experienced welders use their skill to ensure that perfect burn is achieved with Aluminum4543 welding – with just the right amount of heat, sensitivity, knowledge and craftsmanship.


In conclusion, Aluminium 4543 is a highly versatile and durable alloy that offers excellent corrosion resistance, heat resistance and mechanical properties, making it suitable for various applications across various industries ranging from automotive to aerospace to electrical products. It can be easily machined into complex shapes due to its high ductility while still offering a good strength-to-weight ratio making it an excellent choice for any project requiring aluminium alloy materials with these properties. With its great combination of physical properties and affordability relative to other alloys, Aluminum 4543 should be considered when selecting materials for any project involving aluminium alloys!

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