48 



Copper and Copper-base Alloys 



TABLE 4 

 LOW BRASS 



General Data — Rod 

 Copper, 80.95%; lead, trace; tin, trace; zinc, balance 



Property- 



Rod 



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, Jq'g-in. ball, 60-kg. load 



Rockwell hardness B, }^Q-m. 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 



76 

 52 

 56 

 68 

 59 

 18 

 70 

 22 



103 

 80 



130 



42^8 

 7-14 

 10-19 

 10-19 

 9-17 

 65-58 

 82-80 



47-80 

 20-50 

 25-58 

 25-70 

 20-65 

 30-15 

 80-65 



56 



70-104 



81 

 63-133 



45-70 

 24 

 63 



15,000,000 



1250-1450 



Good 



Single phase, alpha 



85 

 55 

 65 

 85 

 80 

 15 

 60 



105 

 82 

 135 



General Data — Strip" 

 Copper, 80.41%; lead, trace; iron, trace; tin, nO; zinc, balance 



Property 



Hard/ 



Soft" 



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, He-i"!- ball, 60-kg. load 



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

 Rockwell hardness G, J^g-iii- ball, 150-kg. load. . . . 

 Rockwell hardness 15-T, J^^g-in. ball, 15-kg. load. . . 

 Rockwell hardness 30-T, Ke-in. bah, 30-kg. load. . . 



General Data — Tube 

 Copper, 79.74%; zinc, balance; lead, trace; iron, trace; tin, nil 



Property 



Soft' 



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



Elongation, % in 2 in 



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

 Rockwell hardness F, }^^-ia. ball, 60-kg. load. 



43 

 19 



58 



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 



1832 



0.0000191 

 32 

 81 



0.313 



o Refers to rod cold-drawn 37 %; rod under 1 



6 Refers to a 1100°F. anneal (1 hr.). 



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



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



* Apply to strip only (all tests conducted on 0.040-in. stock). 



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



Cold-rolled 4 B. & S. Nos.; refer to lOOO^F. anneal. 



'' Cold-drawn to i^-fe by 0.049 in. 



»■ Refers to lOOO^'F, anneal. 



diameter with a ready-to-finish grain size, 0.050 i 



