Nickel Silvers 



205 



10 20 30 40 50 60 TO 80 90 



Percent Peduc+ion in Thickness 

 Chakt 43. — The effect of cold rolling on the percentage reduction 

 of area and percentage elongation in 2 in. of 18 per cent nickel-silver 

 strip (18.40 % nickel, 62.05 % copper, balance zinc) , previously annealed 

 at 1450°r. according to Cook.'"' 



-J(N 

 O C 



o ■■" 



~ -H 

 10 QJ 



0) u 



no 



100 



90 



80 



70 



60 



B ^ 50 



oj"o 40 

 •"" en 

 0) C 

 t^ 30 



£ 20 



10 







500 600 700 800 900 1000 HOO 1200 1300 1400 1500 

 Annealing Temp. in Deg.f: (I Hr: at Temp.) 



Chart 44. — The effect of annealing on the tensile strength, Erichsen 

 value, and percentage elongation in 2 in. of IS per cent nickel-silver 

 strip (18.40% nickel, 62.05% copper, balance zinc), previously cold- 

 rolled 60 per cent (reduction of area) according to Cook.'^s) 



TABLE 7 

 15 PER CENT NICKEL SILVER 



General Data — Sthip<»' 

 Copper, 66.18%; nickel, 15.02%; zinc, balance 



Property 



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



Elongation, %m2in 



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, Ji'e-in. ball, 60-kg. load 



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



Rockwell hardness G, Jle-in. ball, 150-kg. load 



Rockwell hardness 15-T, Ks-iQ- ball, 15-kg. load 



Rockwell hardness 30-T, Me-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., 20°C 



Thermal conductivity, B.t.u. per sq. ft. per ft. per hr. per °F., 68°F. 

 Specific gravity 



o All tests conducted on 0.040-in. stock. 



'^ 6 B. & S. Nos., hard, 0.100-0.015 mm. grain size at ready-to-finish, respectively. 



= Same as footnote h after 1400°F. anneal (1 hr.). 



Soft" 



