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PRODUCT DATA FINISH & TEMPER

STANDARD FINISH

  • Mill Finish

    Natural aluminium finish off the extrusion press.

  • Natural Anodised Finish

    Aluminium is a corrosion resistant metal due to the film of aluminium oxide that forms naturally on its surface.

    By anodising aluminium using an electro-chemical process that thickens the natural oxide film on the aluminium, the resulting anodised aluminium surfaces become extremely hard, and are corrosion and wear resistant

    The natural anodised finish conforms to BS EN12373-1 and is available in nominal film thickness of 6, 10, 15, 20 and 25 microns.

    The recommended film thickness is 10 microns and 25 microns for normal and corrosive atmospheric conditions, respectively.

COLOURED ANODISED FINISH

Aluminium extrusions can be treated in durable inorganic colours to yield a finish which is permanent, lightfast, resistant to abrasion and corrosion, and unchanging in colour intensity. The finish available in bronze and black anodise.

In the colour process, inorganic metal particles are deposited electrolytically in the pores of a clear anodic film. Electrolytic deposition results in the colour particles being fixed at the very base of the pores, allowing virtually the full thickness of the anodic film to protect them.

The extrusion is sealed in boiling deionised water, which closes off the pores in the anodic film and permanently seals in the colour particles.

There are five colours available: Light, Medium Light, Medium, Dark Bronze and Black anodise in nominal film thickness of 15, 20 and 25 microns.

EXTRUSIONS
GRADETEMPERTEMPER DESCRIPTION
AA6063T4Solution heat-treated and naturally aged to a substantially stable condition. No artificial ageing required.
T4Air cooled from the extrusion temperature and artificially aged to improve mechanical properties
T5Solution heat-treated and then artificially aged. These products normally water quenched at the press.
AA6061T6Solution heat-treated and then artificially aged. These products normally water quenched at the press.
SHEETS / PLATES / COILS
GRADETEMPERTEMPER DESCRIPTION
AA1100H14Strain-hardened – 1⁄2 hard
AA3003H14Strain-hardened – 1⁄2 hard
AA5052H32Strain-hardened and stabilised – 1⁄4 hard
AA5083H111Annealed and slightly strain-hardened during subsequent operations such as stretching or levelling
H112Annealed and slightly strain-hardened during subsequent operations such as stretching or levelling
H116Applies to aluminium-magnesium alloys with a magnesium content of 4% or more and for which mechanical property limits and exfoliation corrosion resistance are specified
H321Strain hardened less than required for a controlled H32 temper (Work hardened then stabilised by low-temperature heat treatment to quarter hard).
AA6061T6Solution heat-treated and then artificially aged. These products normally water quenched at the press.
T651Solution heat-treated, Stress-relieved by controlled stretching (permanent set 0.5% to 3% for sheet, 1.5% to 3% for plate, 1% to 3% for rolled or cold-finished rod and bar, 1% to 5% for hand or ring forging and rolled ring) and then artificially aged. The products receive no further straightening after stretching.