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AssigneeYKK Corporation
InventorsKazuyuki Fukagawa, Shoso Yamamoto, Hiroshi Chiba, Mitsunao Satomura, Kengo Kawase
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A high-strength extruded article of an age-hardening aluminum alloy capable of educing an achromatic dark gray color after the anodizing treatment thereof and a method for the production thereof are disclosed. The method comprises subjecting an alloy billet comprising 0.9 to 3.0% by weight of Si, 0.3 to 0.6% by weight of Mg, less than 0.3% by weight of Fe, and the balance of Al and unavoidable impurities or an alloy billet comprising 0.005 to 0.1% by weight of Ti either alone or in combination with 0.001 to 0.02% by weight of B besides the components mentioned above to a soaking treatment at a temperature in the range of from 350.degree. to 480.degree. C. for 2 to 12 hours, extruding the soaked alloy billet at a billet temperature in the range of from 380.degree. to 450.degree. C., and subjecting the extruded alloy to an aging treatment at a temperature in the range of from 170.degree. to 200.degree. C. for 2 to 8 hours. By the use of this method, there is obtained an extruded article which contains precipitated metallic silicon particles uniformly distributed therein and including those of particle sizes in the range of from 0.1 to 2 .mu.m in a proportion of not less than 85% of the total number of the precipitated particles and has the ability to educe a dark gray color of an achromatic color tone in consequence of a subsequent anodic oxidation thereof.
A building grade extruded article of an age-hardening aluminum alloy comprising:
An extruded article of an age-hardening aluminum alloy comprising 0.9 to 3.0% by weight of Si, 0.3 to 0.6% by weight of Mg, less than 0.3% by weight of Fe, 0.005 to 0.1% by weight of Ti either alone or in combination with 0.001 to 0.02% by weight of B, and the balance of Al and unavoidable impurities, which has undergone an extrusion processing comprising subjecting a billet of said alloy to a soaking treatment at a temperature in the range of from 350.degree. to 480.degree. C. for 2 to 12 hours, extruding the soaked alloy billet at a billet temperature in the range of from 380.degree. to 450.degree. C., and subjecting the extruded article to an aging treatment at a temperature in the range of from 170.degree. to 200.degree. C. for 2 to 8 hours, and which has precipitated metallic silicon particles uniformly distributed therein and including those of particle sizes in the range of from 0.1 to 2 .mu.m in a proportion of not less than 85% of the total number of the precipitated particles and has the ability to emit a dark gray color of an achromatic color tone in consequence of an anodic oxidation thereof, the alloy having a psychometric lightness L* of less than 80.
An extruded article of an age-hardening aluminum alloy, the alloy emitting a dark gray color, the alloy comprising:
Dependencies are inferred from the claim text.