Aluminium material is identified by more than its alloy number. A useful description combines the manufacturing route, alloy, temper and product form. For example, 6061-T651 plate and 6063-T6 extrusion are different purchase items, even though both belong to the 6000 series. The distinction affects fabrication, inspection and which property limits apply.
Use the alloy family to narrow the search, then define the actual delivered condition. Ordering simply “aluminium material” or “6000 series” leaves too much unresolved for a comparable quotation or a reliable engineering review.
Four Questions That Define the Material
| Question | What to specify | Why it matters |
|---|---|---|
| How is it made? | Wrought product or casting | The manufacturing route and designation system differ. |
| Which alloy? | A complete designation, such as 5052 or 6061 | A series identifies a family, not an interchangeable material. |
| Which condition? | The full temper, including suffixes | Strength and fabrication response depend on condition. |
| Which form? | Sheet, plate, bar, tube, extrusion or casting | Dimensions, tolerances and testing must match the product. |
Wrought Aluminium and Cast Aluminium
Wrought products: material shaped after solidification
Rolling, extrusion and forging produce different starting forms for fabrication. Rolled sheet may be appropriate for a folded enclosure; plate provides machining stock; an extrusion can place material in a useful cross-section before cutting and assembly. A bar designation alone does not tell you whether it was extruded, rolled or cold finished, so specify the route when it affects acceptance.
Castings: a separate route and numbering system
A casting is formed by solidifying metal in a mould. Under the Aluminum Association system, wrought alloys use four digits, such as 6061; casting designations use three digits plus a decimal digit, such as 356.0. Do not treat the first digit of a casting designation as if it were the same wrought-alloy family. Cast material is not automatically a low-strength substitute: the alloy, process, heat treatment and casting quality must be evaluated for the component.
The Eight Wrought Alloy Families
| Family | Main classification | Examples |
|---|---|---|
| 1xxx | At least 99% aluminium | 1050, 1060, 1100, 1350 |
| 2xxx | Copper-alloyed | 2011, 2024, 2618 |
| 3xxx | Manganese-alloyed | 3003, 3105 |
| 4xxx | Silicon-alloyed | 4032, 4045 |
| 5xxx | Magnesium-alloyed | 5005, 5052, 5083 |
| 6xxx | Magnesium and silicon | 6061, 6063, 6082 |
| 7xxx | Zinc-alloyed | 7075, 7475 |
| 8xxx | Other alloying systems | 8011, 8021 |
The family classification follows the Aluminum Association designation system. These examples identify materials to investigate; they do not establish stock availability, service suitability or equivalence between grades. In particular, not every alloy in a family has the same corrosion behaviour, joining response or available product forms.
Temper Is Part of the Product Name
Temper describes processing condition, not a surface finish. O indicates annealed material; H denotes strain-hardened conditions; W is an unstable solution-heat-treated condition; T denotes specified stable thermally treated conditions. F means as fabricated. The following digits matter: T4 is solution heat treated and naturally aged, T5 is cooled from a hot shaping process and artificially aged, and T6 is solution heat treated and artificially aged.
The ESAB alloy and temper guide explains these distinctions. Avoid shortening a drawing requirement such as T651 or T6511 to “T6” during purchasing. Such suffixes identify additional processing, including stress relief where applicable, rather than decorative details.
Do not compare unlike conditions. A property value for one temper, thickness or product form is not a guaranteed value for every item carrying that alloy number. State the governing standard and distinguish its acceptance limits from typical reference data and actual batch test results.
Choose the Form Around the Next Manufacturing Step
Sheet and plate for cutting, forming or machining
Define thickness, width, length, flatness and surface condition. Sheet and plate terminology follows the applicable specification; neither term alone establishes a universal thickness boundary. For a bent panel, identify bend radius and direction. For a machined plate, include the finished geometry and flatness requirement rather than relying only on the blank dimensions.
The aluminium sheet and plate range is a useful starting point when the required material is a flat rolled product. Keep protective-film, finish and inspection requirements in the same inquiry so they are not lost when quotations are compared.
Bars, tubes and profiles for section-based designs
For bars, state the cross-section and finished or as-supplied condition. For tubes, define outside dimensions and wall thickness, plus seamless or welded construction where relevant. For a profile, a drawing should identify critical walls, radii and fit surfaces. A familiar alloy name does not resolve whether a complex section can meet its dimensional and mechanical requirements.
Review the aluminium profile range when a shaped cross-section can reduce material removal or simplify assembly. Product form should follow the design, not merely the closest catalogue name.
Coil, strip and foil for continuous processing
For coil or slit strip, include width, thickness, coil inside diameter, coil mass and edge requirements. Foil applications may also need limits for pinholes, cleanliness or surface condition. Packaging, insulation and electrical uses impose different requirements; supplying a thin rolled product does not automatically qualify it for all three. Match the delivered form to the unwinding, forming or joining process.
Turn a Material Name into an Orderable Description
A practical specification reads: alloy + full temper + product form + governing standard + dimensions and tolerances + quantity + inspection requirements. Add the intended fabrication route and service conditions when asking for a material recommendation. Applications such as marine equipment, food-contact parts or aircraft components require their own approval criteria; the alloy name alone is not proof of suitability.
- Identify whether dimensions refer to the supplied blank or the finished component.
- Separate mandatory drawing requirements from preferences that may be discussed.
- Request chemistry, mechanical-property and dimensional evidence appropriate to the order.
- Have the responsible engineer approve any change of alloy, temper or manufacturing route.
Discuss the Material Specification
Send the alloy or application, product form, dimensions, quantity and destination. If the designation is incomplete, include the drawing and manufacturing steps so the missing requirements can be identified before pricing.
Post time: Jul-28-2025