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The strength of cast, commercially pure aluminum and magnesium is approximately 13,000 lb. per sq. in., and that of the strongest commercial wrought alloys not over 70,000 lb. per sq. in. and 55,000 lb. per sq. in., respectively. It is evident, then, that these alloys are not, strictly speaking, high-strength metals; yet their high strength-weight ratios make them desirable for all constructional uses where light weight is at a premium, so they properly may be considered “high-strength constructional metals.”
Chief Metallurgist, Aluminum Research Laboratories, New Kensington, Pa.
Aluminum Research Laboratories, New Kensington, Pa.