34 



Copper and Copper-base Alloys 



TABLE 2 

 COMMERCIAL BRONZE 



General Data — Rod 

 Copper, 89.99%; lead, trace; iron, trace; zinc, balance 



Property 



Hard" 



Soft!- 



Forgings 



Hot 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, % in 2 in 



Reduction of area, % 



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



Rockwell hardness F, Hs-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 



Hot-forging range, °F 



Hot-forging quality 



Type structure 



65 

 54 

 60 

 63 

 60 

 18 

 75 

 18 

 97 

 68 

 107 



35-40 

 7-10 

 12-15 

 11-13 

 10-12 

 60-50 

 90-80 

 12-16 

 50-60 



40-65 

 20-52 

 25-58 

 25-61 

 20-55 

 48-19 

 82-75 

 12-16 

 69-97 

 -65 

 62-102 



15,000,000 

 1300-1450 

 Good 

 Single phase, alpha 



65 

 54 

 60 

 63 

 60 

 19 

 75 

 18 

 97 

 67 

 103 



General Data — Strip 

 Copper, 89.74%; lead, nil; iron, trace; zrinc, 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, Xe-i^- ball, 60-kg. load" 



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



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



Rockwell hardness 15-T, Ks-ui- ball, 15-kg. load" 



Rockwell hardness 30-T, >i6-in. ball, 30-kg. load". . 

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



Hard" 



64-69 



5 

 53-57 

 59-60 

 62-64 

 57-60 

 100-103 

 73-77 

 38^4 

 85-86 

 66-68 



Soft/ 



36-39 



45 



8 



11-12 



11-12 



11-12 



59-62 



3-11 



62-64 

 17-23 



15,000,000 



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., 68°F. 

 Density, lb. per cu. in 



1913 



0.0000182 

 43.6 



108 



0.318 



« Refers to rod cold-drawn 50 % ; rod under 1 in. in diameter with ready-to-finish grain size, O.OSO i 



i Refers to 1200°F. anneal (1 hr.). 



« Material cold-forged from soft rod (5-40 % reduction of area) . 



<^ Material cold-forged from cold-worked condition (40%). 



' 6 B. & S. Nos., hard. 0.070-0.015 mm. grain size at ready-to-finish, respectively. 



/ Refers to 1000°F. anneal (1 hr. at temperature). 



' Refers to strip only (all tests conducted on 0.040-in. stock). 



