Nickel Silvers 



193 



TABLE 2 

 20 PER CENT NICKEL SaVER 



General Data — Strip" 

 Copper, 66.11%; nickel, 21.13%; manganese, 0.09%; 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, li^-m. ball, 60-kg. load 



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



Rockwell hardness G, J-je-in. ball, 150-kg. load 



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



Rockwell hardness 30-T, He-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 gravity 



" All tests conducted on 0.040-in. stock. 



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



" 1400°F. anneal (1 hr. at temperature) of material described in footnote b. 



100 

 90 

 80 

 70 



11.0 20.7 29.4 372 44.0 50.0 55.5 60.5 64.8 68.6 

 Percent Reduc+ion of Area by Roiling 

 012345 6789 10 

 B & S Numbers Hard 

 Chaht 5. — The effect of cold rolling on the tensile strength and 

 apparent elastic limit of 20 per cent nickel-silver strip, previously 

 annealed to two different grain sizes, 0.015 and 0.070 mm. (66.11 % 

 copper, 21.13 % nickel, balance zinc) (0.040-iu. stock). 



11.0 20.7 Z9.4 37.2 44.0 50.0 55.5 60.5 64.8 68.6 

 Percenf Reduc+ion of Area by Rolling 

 I 2345678 9 10 

 BSS Numbers Hard 

 Chart 6. — The effect of cold rolling on the Rockwell hardness and 

 percentage elongation in 2 in. of 20 per cent nickel-silver strip, pre- 

 viously annealed to two different grain sizes, 0.015 and 0.070 mm. 

 (66.11 % copper, 21.13 % nickel, balance zinc) (0.040-in. stock). 



