Heat treatment and cold work: specify the delivered condition

Two strengthening approaches

The Aluminum Association distinguishes heat treatment from cold working. In heat-treatable alloys, solution treatment, quenching and subsequent ageing affect the strengthening structure. Other alloys rely on deformation-related strengthening. Annealing, forming and joining should therefore be reviewed as part of the manufacturing route instead of treating every heating operation as a strength increase.

Treat the temper as a requirement

The alloy designation and the temper belong together in a purchase description. State the product form and specification as well. Ask the producer to confirm the delivered condition for the actual section or thickness. A familiar temper suffix is not a guarantee that all manufacturing routes, geometries or later fabrication steps provide the same acceptance properties.

Coordinate the operations

Describe whether machining, bending, joining or finishing occurs before final delivery. Ask who controls any required treatment and who verifies the resulting condition. If a subcontractor is involved, establish how material identity and documentation pass between companies. The enquiry should make the final acceptance point explicit so that certificates refer to the state the buyer actually receives.

Request evidence without inventing recipes

Use the applicable product or process specification to establish treatment and testing requirements. Ask for appropriate certification and documented handling of deviations. Do not create a heat-treatment cycle by combining temperatures from unrelated alloys or assume a hardness check proves every required property. This overview explains strengthening mechanisms; it does not replace qualified thermal-processing procedures or registered detailed temper definitions.

Sources and verification

Selected facts checked 14 October 2026. Source data is reference information, not certification of supplied material.

• Aluminum Association • Alloy standards and strengthening overview — Live overview; September 2026 standards action text; linked paid standards not read · checked 2026-10-14

Do not transfer a treatment schedule across product forms

Speira connects cold work and annealing to rolled-product condition; Rio Tinto records cast-property rows by temper and casting method. These sources describe different starting materials and processing routes. A heat-treatment decision must retain the particular alloy, form and final acceptance basis; a temper name is not a universal furnace recipe.

Source: www.speira.com, www.riotinto.com