Title:
耐食性に優れた高強度アルミニウム合金押出材およびその製造方法
Document Type and Number:
Japanese Patent JP4398428
Kind Code:
B2
Abstract:
The present invention provides a high-strength aluminum alloy extruded product exhibiting excellent corrosion resistance and secondary workability and suitably used as a structural material for transportation equipment such as automobiles, railroad vehicles, and aircrafts, and a method of manufacturing the same. The aluminum alloy extruded product has a composition containing 0.6 to 1.2% of Si, 0.8 to 1.3% of Mg, and 1.3 to 2.1% of Cu while satisfying the following conditional expressions (1), (2), (3), and (4), 3 % ¤ Si % + Mg % + Cu % ¤ 4 % Mg % ¤ 1.7 × Si % Mg % + Si % ¤ 2.7 % Cu % / 2 ¤ Mg % ¤ ( Cu % / 2 ) + 0.6 % and further containing 0.04 to 0.35% of Cr, and 0.05 % or less of Mn as an impurity, with the balance being aluminum and unavoidable impurities. The cross section of the extruded product has a recrystallized structure with an average grain size of 500 µm or less. The manufacturing method includes, when extruding the aluminum alloy into a solid product by using a solid die, extruding the aluminum alloy by using a solid die in which a bearing length (L) is 0.5 mm or more and the bearing length (L) and the thickness (T) of the solid product have a relationship expressed as "L¤5T", and, when extruding the aluminum alloy into a hollow product by using a porthole die or a bridge die, extruding the aluminum alloy while setting the ratio of the flow speed of the aluminum alloy in a joining section to the flow speed of the aluminum alloy in a non-joining section in a chamber, where the billet reunites after entering a port section of the die in divided flows and subsequently encircling a mandrel, at 1.5 or less.
Inventors:
Hideo Sano
Yoshino Yasuaki
Yoshino Yasuaki
Application Number:
JP2005505236A
Publication Date:
January 13, 2010
Filing Date:
April 01, 2004
Export Citation:
Assignee:
Japan Aerospace Industry Association
Kawasaki Heavy Industries, Ltd.
Sumitomo Light Metal Industry Co., Ltd.
Kawasaki Heavy Industries, Ltd.
Sumitomo Light Metal Industry Co., Ltd.
International Classes:
C22C21/12; B21C23/00; B21C23/08; B21C25/02; C22C21/14; C22C21/16; C22F1/057
Domestic Patent References:
| JP2004149907A | ||||
| JP10306338A | ||||
| JP8269608A | ||||
| JP2001011559A |
Attorney, Agent or Firm:
Yasuo Fukuda
Kenji Akatsuka
Kenji Akatsuka