So 



TABLES 54-55. 

 TABLE 54. Aluminum. 



Compressive strength: cast, yield point 13.0 kg/mm 2 or 18,000 lb/in 2 ; ultimate strength 47.0 

 kg/mm 2 or 67,000 lb/in 2 . 



Modulus of elasticity: cast, 6900 kg/mm 2 or 9,810,000 lb/in 2 at 17 C. 



TABLE 55. Aluminum Sheet. 



(a) Grade A (Al min. 99.0) Experimental Erichsen and Scleroscope Hardness Values. 

 [From tests on No. 18 B. & S. Gage sheet rolled from 6.3 mm (0.25 in.) slab. Iron Age v. 101, page 950]. 



(6) Specification Values. (i) Cast: U. S. Navy 49 Al, July i, 1915; Al min. 94, Cu max. 

 6, Fe max. 0.5, Si max. 0.5, Mn max. 3. 



Minimum tensile strength 12.5 kg/mm 2 or 18,000 lb/in 2 with minimum elongation of 8 per 

 cent in 50.8 mm (2 in.). 



(2) Sheet, Grade A: A. S. T. M. 25 to i8T; Al min. 99.0; minimum strengths and elongations. 



NOTE. Tension test specimen to be taken parallel to the direction of cold rolling of the sheet. 

 SMITHSONIAN TABLES. 



