Metal tube and electric cable using the same

Details Metal tube and electric cable using the same Metal tube and electric cable using the same

1995-04-03

1997-07-08

Kincaid, Kristine L.

Electricity: conductors and insulators

Conduits, cables or conductors

Conductor structure

174130, H01B 510

Patent

active

056463723

ABSTRACT:
A metal tube is formed from a metal tape. The metal tape is rounded to be abutted at the both side edges, and the edge-abutted portion is welded to provide a butt-welded seam. The metal tube includes an inner iron base layer, a chrome layer provided on the base layer, and an outer chrome oxide layer provided on the chrome layer. The chrome oxide layer is preferably toughened at the outer surface to provide an appropriate frictional resistance relative to forming tools.

REFERENCES:
patent: 3681515 (1972-08-01), Mildner
patent: 3874076 (1975-04-01), Tsukamoto et al.
patent: 3949896 (1976-04-01), Luc
patent: 4442181 (1984-04-01), Saito et al.
patent: 4497537 (1985-02-01), Dench
patent: 4647720 (1987-03-01), Vokey
patent: 4863060 (1989-09-01), Saunders
patent: 5436058 (1995-07-01), Kato et al.

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