Table 69 {concluded) 

 MECHANICAL PROPERTIES 



Copper Alloys — Three (or more) Components 



1^3 



* Gov't. Bronze: Cu 88, Sn 10, Zn 2 (values shown are averages for 30 specimens from five foundries tested at the 

 Bureau of Standards). 



t Compressive P-limit 10.5 kg/mm 2 or 15,000 lb/in 2 with 29 per cent set for 70 kg/ mm 2 or 100,000 lb/in 2 load. 



X Values from same series of tests as first values for " 88-10-2, averages for 26 specimens from five foundries tested 

 at Bureau of Standards. 



§ Compressive P-limit 9.1 kg/mm 2 or 13,000 lb/in 2 with 34 per cent set for 70 kg/mm 2 or 100,000 lb/in 2 load. 



II Specification minimums: U. S. Navy 46B17, Dec. 2, 1918, for hot-rolled aluminum bronze, Cu 85 to 87, Al 7 

 to g, Fe 2.5 to 4.5. Specification values under P-limit are for yield point. 



H Two and six tenths per cent increase in strength up to 762 mm (30 in.) width. 



** Compressive P-limit: cast, 14. 1 kg/mm 2 or 20,000 lb/in 2 with 11. 4 per cent set at 70 kg/mm 2 or 100,000 lb/in 1 

 load. 



tt Compressive P-limit: cast, 12.7 to 14.1 kg/mm 2 or 18,000 to 20,000 lb/in 2 with 13 to 15 percent set at 700 kg/mm 2 

 or 100,000 lb/in 2 load. 



XX Modulus of elasticity 14,800 kg/mm 2 or 21,150,000 lb/in 2 



§§ Compressive P-limit 8.4 kg/mm 2 or 12,000 lb/ in 2 with 36 per cent set for 70.3 kg/mm 2 , or 100,000 lb/in 2 load. 



II || High values are after Jean Escard " L'Aluminum dans L'Industrie," Paris, igi8. Compressive P-limit 13.5 

 kg/mm 2 or ig,200 lb/in 2 with 13.5 per cent set for 70.3 kg/mm 2 or 100,000 lb/in 2 load. 



Smithsonian Tables. 



