ThePipingMart Blog Grades Aluminium 5657 Alloy (UNS A95657) – Composition, Uses and Properties

Aluminium 5657 Alloy (UNS A95657) – Composition, Uses and Properties

Aluminium 5657

UNS A95657 is an alloy comprised of aluminium, magnesium, and manganese. It’s a versatile alloy used in various applications due to its combination of mechanical and physical properties. In this blog post, we will discuss the composition of Aluminum 5657, its mechanical properties, physical properties, uses corrosion resistance, heat resistance, heat treatment options, and machining/welding considerations.

Aluminium 5657 Composition

This alloy is composed primarily of aluminum (91.4%), magnesium (4.4%), and manganese (3%). Small amounts of silicon (0.1%), iron (0.2%), and other elements are also present in lesser amounts within the composition.

Element Content (%)
Aluminium, Al 99.2
Magnesium, Mg 0.8

Aluminium 5657 Mechanical Properties

UNS A95657 has excellent formability and weldability due to its low yield strength compared to other similar alloys. It has a tensile strength between 290-320 MPa as well as an elongation rate of 16%. Its hardness ranges from 80-90 HBW at room temperature.

Properties Metric Imperial
Elastic modulus 70-80 GPa 10152-11603 ksi
Poisson’s ratio 0.33 0.33

Aluminium 5657 Physical Properties

This alloy has a density of 2.78 g/cm3, making it slightly heavier than other aluminum alloys, such as 5052 or 6061 but lighter than steel alloys, such as 1018 or 1020 steel. Its melting point is 637°C or 1179°F, which makes it easy to work with or weld with traditional welding techniques like MIG welding or TIG welding.

Properties Metric Imperial
Density 2.6-2.8 g/cm3 0.0939-0.1011 lb/in3

Aluminium 5657 Equivalent

  • ASTM B209
  • SAE J454


Due to its excellent formability and weldability as well as its good corrosion resistance, aluminium 5657 is used in many different industries for a variety of applications, including airframes for aircrafts and automobiles, frames for ships and boats, automotive parts such as wheels and bumpers, roofing materials for buildings and much more.

Corrosion Resistance

UNS A95657 has good corrosion resistance in most environments thanks to the presence of magnesium within its composition which helps form a protective oxide layer on the material’s surface that prevents further oxidation from taking place when exposed to air or water vapour over time. However if exposed to salt water environments then more frequent maintenance will be required in order ensure that corrosion does not occur over time due to the increased presence of chlorides within salt water which can accelerate corrosion rates significantly if left unchecked over time so it is important to take these factors into consideration before using this material in any application where it may be exposed to salt water environments on a regular basis.

Heat Resistance & Heat Treatment

UNS A95657 does not have any special heat treatment requirements since it does not harden significantly when heated up above 637 degrees Celsius nor does it become brittle below zero degrees Celsius so it can be used without any additional heat treatments in most cases although some customers may choose to perform heat treatments on this alloy depending on their specific requirements so always check with your supplier before making any decisions on how you should treat your stock material before use in any application where elevated temperatures may be encountered during operation such as engines or exhaust systems etc.


UNS A95657 can be machined easily using conventional machining tools such as drill bits or end mills; however, special attention must be paid when machining this material since it can work harden very quickly if not cooled properly during machining operations so always make sure that your tooling is well lubricated with either oil based coolant or air cooling systems while machining this material otherwise you risk damaging your tools prematurely due too excessive wear rates caused by friction buildup inside your cutting tools during operation so always plan ahead before starting any machining operations on this material!


As far as welding goes, aluminium 5657 can easily be welded using conventional welding techniques such as MIG welding or TIG welding; however, preheating must always be performed before beginning the actual weld itself; otherwise, problems with cracking could occur due to excessive cooling rates occurring inside the weld pool causing microstructural changes that could lead too brittle failure modes later down the line so once again plan ahead before attempting too weld this material!


As you can see there are many advantages associated with using aluminum 5657 including excellent formability & weldability combined with good corrosion resistance & heat resistance, making it ideal for use in many different industries ranging from aerospace through automotive right down too marine applications making it one of the most versatile aluminium alloys currently available on the market today! Additionally, its low cost compared to other similar materials makes it even more attractive for larger scale production runs where cost savings need to be taken into consideration without compromising quality! So if you’re looking for an affordable yet reliable solution, then look no further than aluminium5657 –you won’t regret it!

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Aluminium 5657 Alloy (UNS A95657) – Composition, Uses and Properties

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