Wear resistant extruded aluminium alloy with a high resistance to corrosion
AssigneeHoogovens Aluminium GmbH
InventorsLouis Walter Marie Paul Tack, Edouard Willem Suman, Henricus Matheus Van Der Donk
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Abstract
An aluminium alloy in extruded form, consisting of in weight %: ______________________________________ Si 11.0-13.5 Mg 0.5-2.0 Fe not more than 1.0 Cu not more than 0.35 Zr not more than 0.1 Ni not more than 0.1 Cr not more than 0.1 Zn ot more thane 0.1 Sr 0.02-0.1 Mn not more than 1.2 Bi not more than 1.0 Pb not more than 1.0 Sn not more than 1.0 ______________________________________ balance Al and unavoidable impurities. This alloy has high wear resistance, good corrosion resistance and good machinability. It is particularly suitable for shaped articles used at below 150.degree. C.
Claims26
An aluminum alloy in extruded form which comprises substantially no Si particles, consisting of in weight %:
- Si 11.5-13.5
- Mg 0.5-2.0
- Fe not more than 1.0
- Cu not more than 0.35
- Zr not more than 0.1
- Ni not more than 0.1
- Cr not more than 0.1
- Zn not more than 0.1
- Sr 0.2-0.1
- Mn not more than 1.2
- Bi not more than 1.0
- Pb not more than 1.0
- Sn not more than 1.0
- balance Al and unavoidable impurities.
A method for manufacturing an aluminum alloy comprising substantially no Si particles, consisting of in weight %:
- Si 11.5-13.5
- Mg 0.5-2.0
- Fe not more than 1.0
- Cu not more than 0.35
- Zr not more than 0.1
- Ni not more than 0.1
- Cr not more than 0.1
- Zn not more than 0.1
- Sr 0.02-0.1
- Mn not more than 1.2
- Bi not more than 1.0
- Pb not more than 1.0
- Sn not more than 1.0
- balance Al and unavoidable impurities,
- said method comprising the steps of, in succession,
- (a) casting the aluminum alloy,
- (b) homogenizing the cast aluminum alloy,
- (c) hot extruding the homogenized aluminum alloy,
- (d) a process step selected from
- (d) (i) solution heat treatment, and
- (d) (ii) quenching directly after the hot working of step (c),
- (e) ageing.
A method for manufacturing an aluminum alloy comprising substantially no Si particles, consisting of in weight %:
- Si 11.5-13.5
- Mg 0.5-2.0
- Fe not more than 1.0
- Cu not more than 0.35
- Zr not more than 0.1
- Ni not more than 0.1
- Cr not more than 0.1
- Zn not more than 0.1
- Sr 0.2-0.1
- Mn not more than 1.2
- Bi not more than 1.0
- Pb not more than 1.0
- Sn not more than 1.0
- balance Al and unavoidable impurities, said method comprising the steps of, in succession,
- (a) casting the aluminum alloy,
- (b) homogenizing the cast aluminum alloy,
- (c) hot extruding the homogenized aluminum alloy,
- (d) annealing the extruded alloy for 1-16 hours in the temperature range 300.degree.-450.degree. C.,
- (e) slow cooling to 150.degree. C., and
- (f) cooling to room temperature.
Dependencies are inferred from the claim text.