Title: Aluminum alloy shapes

Abstract: An aluminum alloy consising essentially of 0.65 to 0.75% by weight of magnesium and 0.50 to 0.60% by weight of silicon or 0.47 to 0.57% by weight of magnesium and 0.75 to 0.85% by weight of silicon, 0.15% to 0.25% by weight of iron, less than 0.05% of an impurity selected from the group consisting of copper, manganese, zinc, chromium, and titanium and the balance aluminum, the aluminum alloy being subjected to aging treatment at a temperature below 200.degree. C for 20 to 50 minutes to obtain 0.2% proof stress larger than 11 kg/mm.sup.2, ultimate tensile strength larger than 20 kg/mm.sup.2 and elongation more than 8%. Aluminum alloy shapes are formed of the above aluminum alloy by extrusion forming of the aluminum alloy to obtain an extrusion, coating a film on the surface of the extrusion with a water-soluble paint after forming thereon a ground film, heating the extrusion at a temperature below 200.degree. C for 20 to 50 minutes to effect printing and hardening of the coated film and age hardening of the extrusion at the same time.

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Inventors: Takahashi, Toshiro (Shizuoka, JA)
Nagano, Toshihiro (Shizuoka, JA)
Wada, Kenji (Shizuoka, JA)
Kikuchi, Masaru (Fuji, JA)

Application Number: 550223
Filing Date: 1975-02-18
Publication_date: 1977-08-02
Assignee: Riken Light Metal Industries Company, Ltd. (JA)
Primary Class(es): 428/472.2 148/415, 148/535, 428/522
Other Classes:
US Patent Ref:

3032448	May, 1962	Siebel et al.	148/12.
3234054	Feb, 1966	Sperry	148/12.
3642542	Feb, 1972	Sperry et al.	148/12.
3899370	Aug, 1975	Takahashi et al.	148/159.

Other Refs:
Primary Examiner: Dean, R.
Assistant Examiner:
Attorney: McNenny, Pearne, Gordon, Gail, Dickinson & Schiller