Aluminum alloy hollow material, aluminum alloy extruded pipe...

Details Aluminum alloy hollow material, aluminum alloy extruded pipe... Aluminum alloy hollow material, aluminum alloy extruded pipe...

2005-06-21

2005-06-21

King, Roy (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S690000

Reexamination Certificate

active

06908520

ABSTRACT:
Disclosed are aluminum alloy hollow materials and processes for producing the same wherein an aluminum alloy hollow material is produced by subjecting an ingot of an aluminum alloy containing 0.3˜1.5 wt % Mn to port hole extrusion or port hole extrusion and drawing-elongation processing and wherein a difference in electric conductivity between individual portions in lengthwise direction of the hollow material is not more than 1.0 IACS %. According to the aluminum alloy hollow materials, preferential corrosion in welding potions in port hole extrusion can be prevented.

REFERENCES:
patent: 3990922 (1976-11-01), Gullotti et al.
patent: 5286316 (1994-02-01), Wade
patent: 5976278 (1999-11-01), Sircar
patent: 59-185765 (1984-10-01), None
patent: 61-052346 (1986-03-01), None
patent: 61-119645 (1986-06-01), None
patent: 61-119645 (1986-06-01), None
patent: 04-72045 (1992-03-01), None
patent: 09-263917 (1997-10-01), None
patent: 11-172388 (1999-06-01), None
“ASM Handbook: Desk Edition”, 2nded, ASM International, 1998, p 428.
“ASM Specialty Handbook: Aluminum and Aluminum Alloys”, ASM International, 1993, p. 68.

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