58 



Copper and Copper-base Alloys 



TABLE 6 

 70-30 OR CARTRIDGE BRASS 



General Data — Rod 

 Copper, 70.26%; lead, nil; iron, nil; tin, nil; zinc, balance 



Property 



Rod 



Hard" Soft'' 



Forgings 



Cold'^ 



Cold" 



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



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). .'. . 



Elongation, %in2in 



Reduction of area, % 



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



Rockwell hardness F, J-fe-in. ball, 60-kg. load 



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



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



Modulus of elasticity, p.s.i 



100 

 67 

 64 

 75 

 63 

 14 

 60 

 22 



108 

 89 



154 



22 

 38 

 38 

 34 

 55 

 75 

 17 

 75 

 34 

 70 



55-90 

 28-60 

 42-60 

 42-70 

 37-62 

 50-15 

 73-62 



88-105 



56-85 



90-142 



15,000,000 



108 

 89 

 154 



General Data — Strip 

 Copper, 69.83%; lead, nil; iron, trace; zinc, balance 



Property 



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)". . . . 



Rockwell hardness F, yi^-m. ball, 60-kg. load" 



Rockwell hardness B, J^g-in. ball, 100-kg. load". . 

 Rockwell hardness G, J-fe-iQ- ball, 150-kg. load". . . 

 Rockwell hardness 15-T, Jf g-in. ball, 15-kg. load". . 

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

 Endurance Limit" (at 10* reversals) :<'■*' 



Soft, p.s.i. (000 omitted) 



4 B. & S. Nos., hard, p.s.i. (000 omitted) 



8 B. & S. Nos., hard, p.s.i. (000 omitted) 



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



Hard' 



Soft" 



General Data — Tube 

 Copper, 69.74%; lead, trace; iron, trace; zinc, balance 



Property 



Hard" 



Soft' 



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



Elongation, % in 2 in 



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

 Rockwell hardness F, J'le-in- ball, 60-kg. load. 



Physical Data 



Melting point, °F 



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



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



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



Density 



Type structure 



68°F. 



1750 



0.0000199 

 27.3 

 70 



0.308 

 Single phase, alpha 



