216 



Copper and Copper-base Alloys 



Copper, 62.62 < 



TABLE 10 

 10 PER CENT NICKEL SILVER 



General Data" — Strip 

 ; nickel, 10.05%; zinc, 27.14%; manganese, 0.13%; lead, 0.005' 



iron, 0.04 % 



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, p.s.i. (000 omitted) 



Reduction of area, %in2ia 



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



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



Diamond pj'ramid 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 lO"'': 



At 0-100°C 



At 0-200°C 



AtO-300°C 



At 0-^00°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, microhms-cm.' at 20°C 



Melting point, "F 



Modulus of elasticity, p.s.i 



Hard'' 



47 

 5 



52. 



95 

 114 

 207 



184 



68 



39 

 8.602 



Soft" 



62 



72 

 139.5 



8.608 



0.310 



15.0 

 15.8 

 16.4 

 17.0 



21.54 

 26.14 

 0.00123 

 20.71 



1790 

 18,000,000 



o Based on data by Cook.'-s> 



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



= Refers to a 1450°F. anneal for 2 hr. 



. thickness) from a ready-to-finish anneal for 2 hr. 



260 

 240 

 220 



130 

 120 

 110 

 100 

 90 



S 80 



& 

 (/> 70 



u 

 <u 

 ^ 60 



o 50 



o 



2- 40 



30 



20 

 10 







10 20 30 40 50 60 70 80 90 

 Peren+ Reduc+i'on in Thickness 

 Chakt 81. — The effect of cold rolling on the tensile strength, proof 

 strength, and proportional limit of 10 per cent nickel-silver strip 

 (62.62 % copper, 10.05 % nickel, balance zinc), previously annealed at 

 1450°F. for 2 hr. according to Cook.'^e) 



200 



180 



160 



140 



120 



100 



80 



60 

 ■40 



20 







10 20 30 40 50 60 70 80 90 

 Percen+ Reduction in Thickness 

 Chart 82. — The effect of cold rolling on the hardness of 10 per cent 

 nickel-silver strip (62.62% copper, 10.05% nickel, balance zincj, 

 previously annealed at 1450°F. for 2 hr. according to Cook.*^'' 



