Patent ID: 6623693
Filing Date: 2003-09-23
Classification: B32B,C22C,F28F,Y10S

Abstract:
A magnesium free aluminum alloy article having a machined opening therein, and having a free machining composition consisting essentially of, in weight percent, up to about 0.6% silicon, up to about 1.2% iron, up to about 0.7% copper, between about 0.1% and 1.8% manganese, up to about 0.4% chromium, up to about 0.4% zinc, up to about 0.2% zirconium, between about 0.03 and 0.4% titanium, and either bismuth alone as the one free machining element or bismuth and tin as free machining elements, wherein each of the bismuth and tin is up to about 1.5%, with the balance being aluminum and incidental impurities.