Rolled or extruded aluminium Al-Mn alloy products with...

Details Rolled or extruded aluminium Al-Mn alloy products with... Rolled or extruded aluminium Al-Mn alloy products with...

2005-05-24

2005-05-24

King, Roy (Department: 1742)

Metal treatment

Stock

Aluminum base

C420S550000, C420S553000

Reexamination Certificate

active

06896749

ABSTRACT:
The invention concerns a rolled or extructed product, in particular a tube, made of an alloy composition (expressed in wt. %) comprising: Si<0.30; Fe 0.20-0.05; Cu<0.05; Mn 0.5-1.2; Mg<0.05; Zn<0.50; Cr 0.10-0.30; Ti<0.05; Zr<0.05; the balance consisting of aluminium and unavoidable impurities. The invention also concerns a method for making extruded tubes of said composition comprising casting a billet, optionally homogenizing it, extruding a tube, drawing said tube in one or several passes and continuous annealing at a temperature ranging between 350 and 500° C. with a temperature increase of less than 10 seconds. The inventive products are designed for pipes and heat exchangers for motor vehicles, and exhibit good corrosion resistance.

REFERENCES:
patent: 4167410 (1979-09-01), Anthony et al.
patent: 4334935 (1982-06-01), Morris
patent: 6284386 (2001-09-01), Jeffrey et al.
patent: 290358 (1988-11-01), None
patent: 9746726 (1997-12-01), None
patent: 9918250 (1999-04-01), None
patent: 0050656 (2000-08-01), None

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