| 摘要 |
PURPOSE:To obtain the titled non-heat-treatment type Al alloy by adding prescribed amounts of Mg, Zn, Cu, Ti and B to Al. CONSTITUTION:This Al alloy consists of, by weight, 4.0-<6.0% Mg, 0.5-2.0% Zn, 0.05-0.8% Cu, 0.001-0.10% Ti, 0.0001-0.01% B and the balance Al or further contains one or more among <=0.3% Zr, <=0.3% Cr, <=1.0% Mn and <=0.01% Be. The alloy is a non-heat-treatment type Al alloy having about 30kg/mm.<2> tensile strength and higher strength and cold forgeability than 5056 alloy as a non- heat-treatment type Al alloy. This Al alloy can be used as the material of a rod or a coil of a small diameter such as a metallic fitting of a brake horse for an automobile in place of iron by extrusion.
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