Aluminum Extrusion Alloy
AssigneeRio Tinto Alcan International Limited
InventorsJerome Fourmann, Nicholas C. Parson
Life of this patent
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Abstract
An aluminum alloy includes Si and Mg in amounts (wt. %) within a quadrilateral defined by the following coordinates on an Mg/Si plot: I: 1.15 Si, 0.70 Mg, II: 0.95 Si, 0.55 Mg; III: 0.75 Si, 0.65 Mg; and IV: 0.95 Si, 0.85 Mg. The alloy also includes, in weight percent: Mn 0.40-0.80 Fe 0.25 max Cr 0.05-0.18 Cu 0.30-0.90 Ti 0.05 max Zr 0.03 max Zn 0.03 max B 0.01 max with the remainder of the alloy being aluminum and unavoidable impurities in amounts of up to 0.05 wt. % each and 0.15 wt. % total.
Claims26
An aluminum alloy comprising Si and Mg in amounts within a quadrilateral defined by the following coordinates on an Mg/Si plot, in weight percent:
- I
- 1.15 Si, 0.70 Mg
- II
- 0.95 Si, 0.55 Mg
- III
- 0.75 Si, 0.65 Mg
- IV
- 0.95 Si, 0.85 Mg
- wherein the alloy further comprises, in weight percent:
- Mn
- 0.40-0.80
- Fe
- 0.25 max
- Cr
- 0.05-0.18
- Cu
- 0.30-0.90
- Ti
- 0.05 max
- Zr
- 0.03 max
- Zn
- 0.03 max
- B
- 0.01 max
- with the remainder of the alloy being aluminum and unavoidable impurities in amounts of up to 0.05 wt. % each and 0.15 wt. % total.
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An aluminum alloy comprising, in weight percent:
- Mg
- 0.60-0.80
- Si
- 0.85-1.10
- Mn
- 0.40-0.80
- Fe
- 0.25 max
- Cr
- 0.05-0.18
- Cu
- 0.30-0.90
- Ti
- 0.05 max
- Zr
- 0.03 max
- Zn
- 0.03 max
- with the remainder of the alloy being aluminum and unavoidable impurities in amounts of up to 0.05 each and 0.15 total.
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A method comprising:
- producing a billet of an aluminum alloy comprising:
- Mg
- 0.60-0.80
- Si
- 0.85-1.10
- Mn
- 0.40-0.80
- Fe
- 0.25 max
- Cr
- 0.05-0.18
- Cu
- 0.30-0.90
- Ti
- 0.05 max
- Zr
- 0.03 max
- Zn
- 0.03 max
- B
- 0.01 max
- with the remainder of the alloy being aluminum and unavoidable impurities in amounts of up to 0.05 wt. % each and 0.15 wt. % total;
- homogenizing the billet at a temperature of 540-580° C. for 2-10 hours;
- and
- extruding the billet after homogenization to form an extruded product.
Dependencies are inferred from the claim text.