144 



Copper and Copper-base Alloys 



TABLE 4 

 ADMIRALTY METAL 



General Data — -Tube 

 Copper, 71.34%; tin, 0.97%; lead, nil; iron, trace; zinc, balance 



Property 



Soft" 



Tensile strength, p.s.i. (000 omitted) 



Elongation, % in 2 in 



Apparent elastic limit, p.s.i. (000 omitted) ... 

 Rockwell hardness F, Jf e-in- ball, 60-kg. load 

 Young's modulus of elasticity, p. si 



General Data — Strip' 

 Copper, 70.37%; tin, 1.01%; lead, 0.02%,; iron, 0.01%,; zinc, balance 



Property 



Hard'' 



Soft« 



Tensile strength, p.s.i. (000 omitted) 



Elongation, % in 2 in 



Apparent elastic Umit, p.s.i. (000 omitted) 



Y^ield strength, 0.5% extension, p.s.i (000 omitted) 



Yield strength, 0.2% offset, p.s.i (000 omitted) 



Yield strength, 0.1 % offset, p.s.i (000 omitted) 



Rockwell hardness F, }{e-m. ball, 60-kg. load 



Rockwell hardness B, }{Q-m. ball, 100-kg. load. . . . 

 Rockwell hardness G, Ke-in- ball, 150-kg. load. . . . 

 Rockwell superficial 15-T, }iQ-m. ball, 15-kg. load.. 

 Rockwell superficial 30-T, }i^-m. ball, 30-kg. load. . 



Physical Data 



Melting point, °F 1715 



Density, lb. per cu. in . 308 



Coefficient of expansion, per °C. from 25 to 300°C 0. 0000202 



Electrical conductivity,'*" % I.A.C.S. at 68°F 24.65 



Thermal conductivity,**" B.t.u. per sq. ft. per ft. per hr. per °F., 68°F 64 



Specific gravity 8. 53 



Available Creep Data''> 

 Previous history: rod hot-roUed to 0.875 in. ; cold-drawn to 0.750 in. 



» Admiralty condenser tube 5-4 by 0.049 in. — extruded, reduced, and cold-dr; 

 ^ Same as footnote a after 900°F. anneal (1 hr.)- 

 "= All teats conducted on 0.040-in. stock. 



* 6 B. & S. Nos., hard, 0.080-0.015 mm. grain size at ready-to-finish. 



• 12D0°F. anneal (1 hr. at temperature of material described in footnote d). 



