Nickel Silvers 



191 



10 



20 



40 



50 



Percen+ Zinc 

 Fig. 2. — Composition ranges of nickel silvers, according to Kihlgren, Pilling, and Wise.'"' 



TABLE 1 

 30 PER CENT NICKEL SILVER 



General Data" — Strip 

 Copper, 62.02%; nickel, 29.77%; zinc, 7.93%; manganese, 0.14^ 



lead, 0.003%; iron, 0.09% 



Property 



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



0.10% proof strength, p.s.i. (000 omitted) 



Limit of proportionality, p.s.i. (000 omitted) 



Elongation, % in 2 in 



Reduction of area, % 



Rockwell hardness B, J^e-in. baU, 100-kg. load. . . . 



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



Diamond pyramid hardness, 10-kg. load 



Erichsen value, mm 



Brinell hardness, 10 kg., 1-mm. ball 



Shore Scleroscope M. H 



S. & S., Shore Scleroscope U. H. and self-recorder. . 



Specific gravity 



Density, lb. per cu. in 



Coefficient of thermal expansion, X 10~^: 



At 0-100°C 



At 0-200°C 



AtO-300°C 



At 0-400°C 



Thermal conductivity: 



At 70°F., B.t.u. per sq. ft. per ft. per hr. per °F . 



At 400°F., B.t.u. per sq. ft. per ft. per hr. per °F 

 Temperature coefficient of thermal conductivity. . . . 



Specific resistance, microhm-cm.' at 20°C 



Melting point, °F 



Modulus of elasticity, p.s.i 



Hard" 



Soft'' 



8.872 



0.320 



<» Based on data by Cook/^e) 



* Refers to strip cold-rolled 60 % (reduction i 



« Refers to a 1450*F. anneal for 2 hr. 



L ready-to-finish anneal at 1450°F. for 2 hr. 



