Aluminum 6061 is the major alloy in 6000 Series and possesses good formability and corrosion resistance with medium strength. Aluminum 6061 has been used in a wide range of applications such as heavy-duty structures requiring good corrosion resistance, railroad cars and pipelines. Alloying content of 6061 is given in the following chart.

Aluminum 6061 Content (% by weight)
Content Wt. % Content Wt. %
Aluminum 95.8 - 98.6 Iron Max 0.7
Silicon 0.4 - 0.8 Copper 0.15 - 0.40
Manganese Max 0.15 Chromium 0.04 - 0.35
Magnesium 0.8 - 1.2 Zinc Max. 0.25
Titanium Max. 0.15 Others Max. 0.15

Some of the important temper designations of aluminum 6061 are T6 and T4 and these are summarized below.

  • T6 temper is solution heat treated and then artificially aged.
  • T651 temper is solution heat treated, stress relieved by stretching then artificially aged.
  • T4 temper is solution heat-treated and naturally aged.
  • T451 temper is solution heat treated, stress relieved by stretching and naturally aged.
  • Some of the characteristics of aluminum 6061-T6/T651 and 6061-T4/T451 are summarized below.
Aluminum 6061 Characteristics
Characteristic Al 6061-T6, T651, T6510 Al 6061-T4, T451, T4510
General resistance to corrosion Rated B (Can be used in industrial atmospheres without protection)
Stress-corrosion cracking Rated A (No known instance of failure in service or in laboratory tests.) Rated B (No known instance of failure in service; limited failures in laboratory tests for short transverse specimens)
Workability (Cold) Rated C (Ratings are A through D) Rated B (Ratings are A through D)
Machineability Rated C (Ratings are A through E)
Gas Welding Rated B (Weldable with special techniques)
Brazeability, Arc, Resistance Spot and Seem Welding Rated A (Generally weldable by all commercial procedures and methods)


Aluminum 6061 Plate and Sheet: Material properties of aluminum 6061 plate and sheet

Aluminum 6061 Tube and Pipe: Material properties of aluminum 6061 drawn tube and pipe.

Aluminum 6061 Bar, Rod and Shapes: Material properties of aluminum 6061 rolled, drawn, cold-finished or extrusion rod, bar and shapes.


  • MMPDS-01, Metallic Materials Properties Development and Standardization (2003)
  • AA-FMA-17, The Aluminum Association, Forming and Machining Aluminum (1988)
  • AA-38, The Aluminum Association, Structural Design with Aluminum (1987)