6061-T651 aluminum plate is a great choice for most production processes, indoors and outdoors. It is often regarded as the most versatile of the heat-treatable aluminum alloys, with excellent corrosion resistance. The material is lightweight, with a semi-smooth surface and a dull mill finish-the as-rolled surface without polishing. Aircraft and trailers are common applications for which parts are machined to end-user specifications.
1. Material Overview of 6061 T651 Mill Finish Aluminum Sheet
The 6061 aluminum plate is one of the most versatile heat-treatable alloys. Type 6061-T651 is widely used for flooring, ramps, and steps because of its medium-to-high strength, outstanding toughness, and excellent corrosion resistance. 6061 is a general-purpose alloy composed of magnesium and silicon, one of the heat-treatable grades with the highest corrosion resistance; it is lightweight, easily machined, and may be welded using typical procedures.
2. What Makes T651 Different from T6
6061-T651 aluminum alloy has undergone the same heat treatment process as T6 - solution heat treatment and artificial aging to introduce strengthening precipitates within the material, making it harder and stronger than the bare (as-cast) alloy. The key distinction is that 6061-T651 is the stress-relieved variant of 6061-T6, accomplished through a stretching process following heat treatment. This additional stress relief improves dimensional stability and lowers the danger of warping during machining, making T651 appropriate for high-precision and large parts. 6061-T6 is a more cost-effective option for typical applications where high dimensional stability is not required.
3. Specification of 6061 T651 Aluminum Sheet
3.1 Available Product Forms
| Product | Thickness | Width |
|---|---|---|
| 6061 aluminum sheet | 0.2 - 6 mm (0.01" - 0.24") | 900 - 2650 mm (35.4" - 104") |
| 6061 aluminum plate | 6 - 250 mm (0.24" - 9.84") | 900 - 2650 mm (35.4" - 104") |
| 6061 ultra-wide plate | As per order (special class) | Wider than 2650 mm, confirmed at order |
| 6061 diamond (checkered) plate | 1.2 - 8 mm (0.05" - 0.32") | 900 - 1850 mm (35.4" - 72.8") |
Length: max 6 m; fixed, cut-to-length or customized.
3.2 Lamination and Surface Treatment
Lamination types: blue film, transparent film, black-and-white film, or paper (film thickness 50-80 microns). Surface treatments available: mill finish, bright, polished, hairline, brush, sandblast, checkered, embossed, etched, and others on request.
3.3 Governing Standards
ASTM B209, AMS 4027, AMS-QQ-A-250/11, AMS 4025, DIN EN 485-2, GB/T 3190 (AMS 4027 is the aerospace sheet specification; AMS 4025 covers plate).
4. Typical Mechanical Properties
6061-T651 plate commonly meets a minimum yield strength of about 276 MPa (40 ksi) and a minimum tensile strength of about 310 MPa (45 ksi) per ASTM B209 for common thicknesses, with elongation in the 10-12% range. Confirm the exact values against the governing standard and the mill certificate for the ordered thickness.
5. Typical Applications and Selection Note
6061-T651 mill finish plate is used for aircraft parts, truck and trailer components, flooring, ramps and steps, and precision machined parts where dimensional stability matters. Choose T651 when the part will be extensively machined or must hold tight tolerances after cutting; choose 6061-T6 for general structural applications where the cost advantage matters more than machining stability.
