| 摘要 |
PROBLEM TO BE SOLVED: To produce an alloy high in the extruding rate and having high strength by prescribing the alloy components and melting starting temp. SOLUTION: This alloy contains, by weight, 0.2 to 0.9% Cu, 0.6 to 1.1% Si, 0.4 to 1.0% Mg, and prescribed amounts of Fe, Mn, Cr, Ti and B. Then, the components are set so as to regulate the melting starting temp. T defined by T( deg.C)=667-21%Cu-42×%Si-38×Mg to >=585 deg.C. Furthermore, by suitably regulating the casting conditions, homogenizing treatment to a billet and the conditions of extruding and aging treatment, the material strength of >=350N/mm<2> tensile strength and >=330N/mm<2> 0.2% proof stress can be obtd. Thus, it is usable instead of steels, and the remarkable lightening of various apparatus and structural bodies is made possible. Furthermore, the material extrudable at the extruding rate equivalent to that in 6061 alloys good in extrudabilidty can be obtd.
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