196 



Copper and Copper-base Alloys 



TABLE 3 

 20 PER CENT NICKEL SILVER 



General Data for Tube 

 Copper, 75.00%; nickel, 20.00%; zinc, 5.00% 



Property 



Hard- 



Soft'' 



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



Elongation, % in 2 in 



Apparent elastic limit, p.s.i. (000 omitted) 



Rockwell hardness F, >f e-in- hall, 60-kg. load 



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



Melting point, °F 



Specific gravity ". 



Electrical conductivity, % I.A.C.S., 68°F 



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



Coefficient of expansion, per °C. from 25-300°C 



Density, lb. per cu. in 



81 



5 



78 



106 



17,500,000 



2100 



8.84 



6.20 



22.3 



0.0000164 



0.319 



Available Creep Data"' 

 Previous history: cold-drawn rod 0.750 in.; annealed 1202°F.; tensile strength, 50,400 p.s.i.; % elongation in 2 in., 51; 

 % reduction of area, 75. 



o Extruded, reduced, drawn to Ji by 0.049 i 

 ' Annealed at 1300°F. for 1 hr. 



-t 90 



■-2 80 



70 



60 



50 



40 



30 



± 20 



^ 



CD. 700 800 900 1000 1100 1200 1300 1400 1500 1600 

 Annealing Temp, in Deg.f;( IHr at Temp.) 



Chart 15. — The effect of annealing on the tensile strength and 

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

 cold-drawn 40 per cent (reduction of area) (75.00 % copper, 20.00 % 

 nickel, 5.00 % zinc). 



CD. 700 800 900 1000 1100 1200 1300 1400 1500 1600 

 Annealing Temp.in Deg.F (lHr.a+ Temp.) 



Chart 16. — The effect of annealing on the Rockwell hardness, 

 percentage elongation in 2 in., and grain size of 20 per cent nickel-silver 

 tube, previously cold-drawn 40 per cent (reduction of area) (75.00 % 

 copper, 20.00 % nickel, 6.00 % zinc). 



