# 7075-T651 aluminum

Product-specific reference for stretched 7075 plate, typical strength, corrosion tradeoffs and fabrication limits.

Reviewed: 2026-11-01

Tags: materials, aluminum, plate, heat-treatment, corrosion

## Identify alloy, temper and stock

Kaiser's rolled-product reference gives **572 MPa tensile, 503 MPa yield and 11% elongation over 4D** for 7075-T651, versus **503 MPa, 434 MPa and 13%** for T7351. Both rows are **typical**. Use the specified product form, thickness and direction to select an acceptance minimum. [Kaiser Rev. 05/06 typical properties](https://online.kaiseraluminum.com/depot/PublicProductInformation/Document/1017/Kaiser_Aluminum_7075_Sheet_Coil_and_Plate.pdf)

**7075-T651** combines a high-strength wrought aluminium alloy with a defined thermal and stress-relief condition. The Aluminum Association's **Teal Sheets, revised December 2025**, register **5.1–6.1% zinc, 2.1–2.9% magnesium, 1.2–2.0% copper and 0.18–0.28% chromium by mass**, with limits on other elements. This chemistry envelope does not establish a delivered product's strength, toughness, flatness or corrosion performance. [AA 7075 registration](https://www.aluminum.org/sites/default/files/2026-01/Teal%20Sheets%20December%202025.pdf)

## Distinguish T6, T651 and overaged conditions

**T6** means solution heat-treated and artificially aged. **T651** adds stress relief by controlled stretching, with no subsequent straightening. **T6511** is a related stretched-product designation allowing minor straightening to meet tolerances. These processing distinctions belong in the certificate and route record; do not abbreviate all three to T6. [Capalex temper definitions](https://capalex.co.uk/whatwedo/heat-treatment)

Stretching does not guarantee zero residual stress, finished-part flatness or immunity to stress-corrosion cracking. Incoming stock tolerances and finished-part dimensional requirements remain separate. For substantial or asymmetric stock removal, qualify workholding, roughing allowance, sequencing and measurement after unclamping.

T7351 is another delivery condition with a different strength/corrosion balance. It is not merely an alternative spelling of T651. A substitution needs approval against the complete design requirements, rather than selection of whichever temper has the more favourable individual property.

## A typical-property comparison

Kaiser's **Sheet Coil & Plate Alloy 7075** technical data explicitly labels its mechanical table **typical**. It gives the following selected values, based on a **0.500-inch-diameter tensile specimen** with elongation over **4D**:

| Temper | Ultimate tensile strength | Yield strength | Elongation |
| --- | --- | --- | --- |
| T651 | 572 MPa | 503 MPa | 11% |
| T7351 | 503 MPa | 434 MPa | 13% |

These are comparison values, not guaranteed batch minima or structural design allowables. Preserve specimen basis, product, thickness and direction when choosing actual acceptance data. [Kaiser 7075 typical mechanical properties](https://online.kaiseraluminum.com/depot/PublicProductInformation/Document/1017/Kaiser_Aluminum_7075_Sheet_Coil_and_Plate.pdf)

Kaiser's flat-rolled reference separately lists mechanical limits by alloy/temper, thickness band and bare/Alclad product. Use the applicable complete table and footnotes, not the typical comparison above, for interpreting a specification. Keep the original plate thickness and rolling direction with a machined blank; final wall thickness does not redefine the parent product. [Kaiser flat-rolled mechanical-property reference](https://online.kaiseraluminum.com/depot/PublicProductInformation/Document/1010/Kaiser_Aluminum_Sheet_Plate.pdf)

Typical properties support preliminary comparison. Purchase limits govern acceptance under the ordered specification. Design allowables additionally require an appropriate statistical/data basis, orientation and load-case assessment. A high tensile value alone cannot establish fatigue life, fracture resistance, bearing strength or performance at a stress concentration.

## Corrosion is a separate selection constraint

The Aluminum Association's **May 2009 Table 3.3** rates general corrosion and stress-corrosion cracking separately. Its 7075 T6/T651 group has a less favourable stress-corrosion rating than its T73/T7351 group. The footnotes explain that these are comparative ratings based on specified testing and service experience, not lifetime predictions. [AA comparative characteristics and footnotes](https://www.aluminum.org/sites/default/files/2022-12/Table_3.3.pdf)

The same footnotes distinguish specimen orientation and sustained tensile stress in their description of cracking susceptibility. Do not turn a broad alloy rating into a universal service limit. Assess stock orientation, residual and applied stress, joints, crevices, moisture and dissimilar-metal contacts for the actual assembly. A protective finish does not remove the need for that assessment. [AA stress-corrosion rating definitions](https://www.aluminum.org/sites/default/files/2022-12/Table_3.3.pdf)

Specify protection and inspection requirements where needed, including coverage at faying surfaces and machined features. Bare and clad stock require separate treatment in the route: cutting or machining can expose material that differs from the original surface. An anodised sample does not establish corrosion life or acceptable appearance across every weld, grain orientation or stock source.

## Machining, forming and joining boundaries

Kaiser's comparative table rates cold workability of T651 poorly. Do not apply a bend process established on soft material to delivered T651 without trials and approval of the final condition. Define bend geometry, thickness, direction, surface quality and any subsequent thermal processing before selecting the route. [Kaiser processing characteristics](https://online.kaiseraluminum.com/depot/PublicProductInformation/Document/1017/Kaiser_Aluminum_7075_Sheet_Coil_and_Plate.pdf)

For machining, record stock identity, geometry revision, tool/coolant strategy, clamping and operation sequence. Inspect the final released component rather than relying on a measurement taken while it is constrained. Neither T651 nor a supplier's machining description guarantees a universal feed, finish or distortion limit.

Kaiser's table also distinguishes spot welding from gas/arc welding and brazing. Do not interpret a favourable rating for one joining method as general weldability. A joined 7075 component needs a process specifically qualified for its materials, geometry and required joint properties; the incoming T651 certificate cannot qualify the thermally affected assembly. [Kaiser joining ratings and definitions](https://online.kaiseraluminum.com/depot/PublicProductInformation/Document/1017/Kaiser_Aluminum_7075_Sheet_Coil_and_Plate.pdf)

Do not assume a simple ageing operation restores the original delivered condition after welding or other heating. Proposed heat treatment, forming in another temper or material substitution needs a controlled route and final acceptance basis. This reference supplies no generic heat-treatment recipe, welding filler or continuous-service temperature limit.

## Estimate and release

The AA nominal-density table gives **2.81 g/cm³** for 7075. An original estimate for an uncoated **200 × 100 × 20 mm** blank is **0.0004 m³ × 2,810 kg/m³ = 1.124 kg**. Dimensions, tolerances, film and removed material affect actual mass. [AA nominal-density table](https://www.aluminum.org/sites/default/files/2026-01/Teal%20Sheets%20December%202025.pdf)

Release against the complete ordered material specification and finished-part criteria. Retain lot certification, original stock dimensions/direction, processing history and inspection results. Sources were reviewed November 1, 2026; the AA publication dates are taken from the documents, and search/upload dates are not treated as material revisions.

## Related reference

[Grades, tempers and conditions](../grades-tempers-and-conditions.md)