Aluminum Alloys grade

Wrought alloys

The International Alloy Designation System is the most widely accepted naming scheme for wrought alloys. Each alloy is given a four-digit number, where the first digit indicates the major alloying elements, the second — if different from 0 — indicates a variation of the alloy, and the third and fourth digits identify the specific alloy in the series. For example, in alloy 3105, the number 3 indicates the alloy is in the manganese series, 1 indicates the first modification of alloy 3005, and finally 05 identifies it in the 3000 series.

• 1000 series are essentially pure aluminium with a minimum 99% aluminium content by weight and can be work hardened.
• 2000 series are alloyed with copper, can be precipitation hardened to strengths comparable to steel. Formerly referred to as duralumin, they were once the most common aerospace alloys, but were susceptible to stress corrosion cracking and are increasingly replaced by 7000 series in new designs.
• 3000 series are alloyed with manganese, and can be work hardened.
• 4000 series are alloyed with silicon. They are also known as silumin.
• 5000 series are alloyed with magnesium.
• 6000 series are alloyed with magnesium and silicon. They are easy to machine, are weldable, and can be precipitation hardened, but not to the high strengths that 2000 and 7000 can reach. 6061 alloy is one of the most commonly used general-purpose aluminium alloys.
• 7000 series are alloyed with zinc, and can be precipitation hardened to the highest strengths of any aluminium alloy (tensile strength up to 700 MPa for the 7068 alloy).
• 8000 series are alloyed with other elements which are not covered by other series. Aluminium-lithium alloys are an example

List of aerospace aluminium alloys

The following aluminium alloys are commonly used in aircraft and other aerospace structures:

• 7068 aluminium
• 7075 aluminium
• 6061 aluminium
• 6063 aluminium
• 2024 aluminium
• 5052 aluminium
• 7050 aluminium

Note that the term aircraft aluminium or aerospace aluminium usually refers to 7075.
6063 aluminium alloys are heat treatable with moderately high strength, excellent corrosion resistance and good extrudability. They are regularly used as architectural and structural members.
The following list of aluminium alloys are currently produce, but less widely used:

• 2090 aluminium
• 2124 aluminium
• 2195 aluminium – Al-Li alloy, used in Space Shuttle Super Lightweight external tank, and the SpaceX Falcon 9 and Falcon 1e second stage launch vehicles.
• 2219 aluminium – Al-Cu alloy, used in the original Space Shuttle Standard Weight external tank
• 2324 aluminium
• 5059 aluminium – Used in experimental rocket cryogenic tanks
• 6013 aluminium
• 7050 aluminium
• 7055 aluminium
• 7150 aluminium
• 7475 aluminium

Marine alloys

These alloys are used for boat building and shipbuilding, and other marine and salt-water sensitive shore applications.

• 5052 aluminium alloy
• 5059 aluminium alloy
• 5083 aluminium alloy
• 5086 aluminium alloy
• 6061 aluminium alloy
• 6063 aluminium alloy

4043, 5183, 6005A, 6082 also used in marine constructions and off shore applications.

Cycling alloys

These alloys are used for cycling frames and components

• 2014 aluminium
• 6061 aluminium
• 6063 aluminium
• 7005 aluminium
• 7075 aluminium
• Scandium aluminium

Automotive alloys

6111 aluminium and 2008 aluminium alloy are extensively used for external automotive body panels, with 5083 and 5754 used for inner body panels. Hoods have been manufactured from 2036, 6016, and 6111 alloys. Truck and trailer body panels have used 5456 aluminum.
Automobile frames often use 5182 aluminium or 5754 aluminium formed sheets, 6061 or 6063 extrusions.
Wheels have been cast from A356.0 aluminium or formed 5xxx sheet.

Air and gas cylinders

6061 aluminum and 6351 aluminium are widely used in breathing gas cylinders for scuba diving and SCBA