86 



TABLE 65. 



Table 65 {continued). 

 MECHANICAL PROPERTIES- 

 Copper Alloys — Three (or more) Components. 



* Specification Values, Rolled Brass, Cu 62, Zn 37, Sn i, min. properties after U. S. Navy Spec., 1918. 



I Specification Values: Jan. 3, 1916, Vanadium Bronze Castings, Cu 61, Zn 38, Sn max. i (incl. V'). Mimima. 

 Compressivj P-limit 15.5 kg/mm- or 22,000 Ib/in- 



§ Compressive P-limit 10.5 kg/mm^ or 15,000 lb/in- and 28 per cent set for 70 kg/mm^ or 100,000 Ib/in- 



II Ultimate compressive strength, 54.2 kg/mm^ or 77,100 Ib/in^ fCu 76, Sn 7, Pb 13, Zn 4). , 



II Compressive P-limit S.S to g.i kg/mm- or 12,500 to 13,000 Ib/in^, and 34 to 35 per c'nt setior 70 kg/mm^ 



** Compression: ultimate strength 49.5 kg/mm^ or 70,500 Ib/in^ 



tt Modulus of Elasticity: (i) 12,200 kg/mm^ or 17,300,000 lb/in'; (2) 10,500 kg/mm^ or 14,900,000 lb/in' 



XX Compressive P-limit 17.6 to 28.1 kg/mm^ or 25,000 to 40,000 Ib/itf and 6 to 10 per cent set for 70 kg/mm* 

 or 100,000 Ib/in^ load. 



Specification Values: U. S. Navy 46 B 5c, Mar. i, 1917, Cu 85 to 90, Sn 6 to 11, Zn max. 4: Cast, Grade i. — Im- 

 purities max. 0.8; min. tensile strength 31.'^ kg/mm^ or 45,000 Ib/in^ with 20 per cent along, in 50.8 mm (2 in.). 



If Grade 2. — Impurities max. 1.6; min. tensile strength 21. i kg/mm^ or 30,000 Ib/in^ with 15 per cent elong. in 

 S0.8 mm (2 in.). 



§§ Specification Values: U. S. Navy 46B 14b, Mar. i, 1916, Cu mi». 94, Sn min. 3.5, P 0.50, rolled or drawn. 



nil MiiumuMi yield points specified : for P-limits assume 66 per cent of values shown. 



Smithsonian Tables. 



