Aluminium alloy and extrusion
AssigneeAlcan International Limited
InventorsNicholas Charles Parson, Barry Roy Ellard, Graeme John Marshall
Life of this patent
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Abstract
A population of extrusion billets has a specification such that every billet is of an alloy of composition (in wt. %): Fe<0.35; Si 0.20-0.6; Mn<0.10; Mg 0.25-0.9; Cu<0.015; Ti<0.10; Cr<0.10; Zn<0.03; balance Al of commercial purity. After ageing to T5 or T6 temper, extruded sections can be etched and anodised to give extruded matt anodised sections having improved properties.
Claims17
1-8. (canceled)
A method of producing a population of aluminum alloy billets comprising performing more than one cast of metal wherein each cast of metal converts a body of molten metal comprising virgin metal and recycled scrap into a plurality of billets, and wherein said body has a composition within a specification such that every billet of the population has a composition (in wt %) consisting essentially of:
- Constituent
- Range
- Fe
- <0.35
- Si
- 0.20-0.6
- Mn
- <0.10
- Mg
- 0.25-0.9
- Cu
- <0.015
- Ti
- <0.10
- Cr
- <0.10
- Zn
- <0.03
- balance Al of commercial purity.
A method of making an extruded section comprising
- (a) producing a population of aluminum alloy billets comprising performing more than one cast of metal wherein each cast of metal converts a body of molten metal comprising virgin metal and recycled scrap into a plurality of billets, and wherein said body has a composition within a specification such that every billet of the population has a composition (in wt %) consisting essentially of:
- Constituent
- Range
- Fe
- <0.35
- Si
- 0.20-0.6
- Mn
- <0.10
- Mg
- 0.25-0.9
- Cu
- <0.015
- Ti
- <0.10
- Cr
- <0.10
- Zn
- <0.03
- balance Al of commercial purity;
- and
- (b) extruding a billet taken from said population of billets.
A method of producing a population of aluminum alloy billets comprising performing more than one cast of metal wherein each cast of metal converts a body of molten metal comprising virgin metal and recycled scrap into a plurality of billets, and wherein said body has a composition within a specification such that every billet of the population has a composition (in wt %) consisting essentially of:
- Constituent
- Range
- Fe
- 0.16-0.35
- Si
- 0.4-0.6
- Mn
- 0.01-0.05
- Mg
- 0.35-0.6
- Cu
- <0.010
- Ti
- <0.05
- Cr
- <0.09
- Zn
- <0.03
- balance Al of commercial purity.
A method of making an extruded section comprising
- (a) producing a population of aluminum alloy billets comprising performing more than one cast of metal wherein each cast of metal converts a body of molten metal comprising virgin metal and recycled scrap into a plurality of billets, and wherein said body has a composition within a specification such that every billet of the population has a composition (in wt %) consisting essentially of:
- Constituent
- Range
- Fe
- 0.16-0.35
- Si
- 0.4-0.6
- Mn
- 0.01-0.5
- Mg
- 0.35-0.6
- Cu
- <0.010
- Ti
- <0.05
- Cr
- <0.09
- Zn
- <0.03
- balance Al of commercial purity;
- and
- (b) extruding a billet taken from said population of billets.
Dependencies are inferred from the claim text.