222 



Copper and Copper-base Alloys 



TABLE 13 

 LEADED 12 PER CENT NICKEL SILVER 



General Data — Strip" 

 Copper, 65.49%; nickel, 12.11%; lead, 1.96%; zinc, balance 



Property 



TensUe 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 



Rockwell hardness F, Jie-in. baU, 60-kg. load 



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



Rockwell hardness 15-T, 3-1 o"™- baU> 15-kg. load 



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



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



Melting point, "F 



Density, lb. per cu. in 



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 

 Specific gravit J' 



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



!> 6 B. & S. Nos., hard, 0.060-0.015 mm. grain size at ready-to-finish. 



" Refers to 1400°F. anneal (1 hr. at temperature). 



Soff^ 



110 



100 



90 



80 



B 70 



'Z 60 



lU 

 Q. 



^ 50 



§ 40 



30 



20 



10 



11.0 20.7 29.4 37.2 44.0 50.0 55.5 60.5 64.6 

 Percent Reduction of Area'by Rolling 

 01 23456789 

 B&5 Numbers Hard 



Chakt 97. — The effect of cold rolling on the tensile strength and 

 apparent elastic hmit of 12 per cent nickel-silver-leaded strip, previ- 

 ously annealed to two different grain sizes, 0.015 and 0.060 mm. 

 (65.49% copper. 12.11 % nickel, 1.96% lead, balance zinc) (0.040-in. 

 stock) . 



10 



O 



s^llO 



o 



2 100 



GD 



13 90 



C 



o 

 -! 80 



S TO 



Li. 



= 60 

 a 



DD 



-.^ 50 



^^^ 



I 40 



1 30 

 a 



X 



- 20 



OcL 



11.0 20.7 29.4 372 440 50.0 55.5 60.5 648 68.6 

 Percent Reduction of Area by Rolling 

 01 2345 6769 10 

 B'&S Numbers Hard 



Chart 98. — The effect of cold rolling on the Rockwell hardness and 

 percentage elongation in 2 in. of 12 per cent nickel-silver— leaded strip, 

 previously annealed to two different grain sizes, 0.015 and 0.060 mm. 

 (65.49% copper, 12.11 % nickel, 1 96% lead, balance zinc) (0 040-in. 

 stock). 



