152 



Copper and Copper-base Alloys 



TABLE 6 



NAVAL BRASS 



General Data — Rod 



Copper, 69.64%; tin, 0.66%; lead, 0.12%,; iron, 0.08%; zinc, balance 



Property 



Rod 



Hard" Soff- 



Forgings 



Hot 



Cold' 



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



Elongation, % in 2 in 



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



Yield 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). . . . 



Reduction of area, % 



Endurance limit, p.s.i. (000 omitted) 



Rockwell hardness F, He-in- ball, 60-kg. load 



Rockwell hardness B, Ke-in. ball, 100-kg. load. . . . 



Brinell hardness, 10-mm. ball, 500-kg. load 



Modulus of elasticity, p.s.i 



Forging range, °F 



Forging quality 



Type structure 



15 

 69 

 58 

 60 

 56 

 46 

 26 



84 

 140 



16 

 22 

 22 

 20 

 52 

 21 



59-62 

 48-40 

 16-20 

 22-25 

 22-25 

 19-24 

 50-59 



55 



78-85 

 50-55 

 83-89 



15,000,000 



1250-1450 



Excellent 

 Two phase, alpha-beta 



64 

 40 

 32 

 35 

 35 

 35 

 50 



92 

 62 



General Data — Strip'' 

 Copper, 61.51%; zinc, balance; tin, 0.57%; lead, 0.08%; iron, trace 



Property 



Hard' 



Soft^ 



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



Elongtion, % in 2 in 



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



Yield 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, He-in. ball, 60-kg. load 



Rockwell hardness B, He-in- ball, 100-kg. load 



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



Rockwell hardness 15-T, Jie-in. ball, 15-kg. load 

 Rockwell hardness 30-T, Ks-in. ball, 30-kg. load. . . 

 Young's modulus of elasticity, p.s.i 



Physical Data 



Melting point, °F 1640 



Coefficient of expansion, per °C. from 25-300°C 0.0000214 



Electrical conductivity,"" % I.A.C.S, 68°F 25.8 



Thermal conductivity,'"' B.t.u. per sq. ft. per ft. per hr. per °F., 68°F 68 



Density, lb. per cu. in 0.304 



<• Refers to rod cold-drawn 28 % ; rod under 1 in. in diameter only — ready-to-finish grain size, 0.025 mm. 



' Refers to 1200°F. anneal (1 hr.). 



« Material cold-struck from forged condition. 



<< All tests conducted on 0.040-in. stock. 



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



/ 1300°F. anneal (1 hr. at temperature) of material described in footnote c. 



