Nickel Silvers 



199 



§120 



_i 



D^IIO 



o 100 



CD 



^ 90 

 o 

 o 



-! 80 

 2^ 



S 70 

 u. 



^ 60 

 o 



CQ 



. ^ 50 

 !? 40 

 ■g 30 



C3 



^ 20 



ce. 



CR 400 500 600 700 800 900 1000 1100 1200 1300 1400 

 Annealing Temp, in Oeg.F ( IHr. af Temp.) 

 Chart 23. — The effect of annealing on the Rockwell hardness and 

 percentage elongation in 2 in. of 18 per cent nickel-silver strip, pre- 

 viously cold-rolled 6 B. & S. Nos. (50 per cent reduction of area) from 

 two different grain sizes, 0.015 and 0.070 mm. (66.00 % copper, 18.00 % 

 nickel, balance zinc) (0.040-in. stock). 



100 

 90 

 ■80 



^ 60 

 S. 50 



o 40 

 o 



2-30 

 20 

 10 







400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg.F f 1 Hr: a+ Temp.) 

 Chart 24. — The effect of annealing on the yield strength of 18 

 per cent nickel-silver strip, previously cold-rolled 6 B. & S. Nos. 

 (50 per cent reduction of area) from a grain size of 0.015 mm. (66.00 % 

 copper, 18.00 % nickel, balance zinc) (0.040-in. stock). 



no 



400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg.F.f lHr.a+ Temp.) 



Chart 25. — The effect of annealing on the yield strength of IS per 

 cent nickel-silver strip, previously cold-rolled 6 B. & S. Nos. (50 per 

 cent reduction of area) from a grain size of 0.070 mm. (66.00 % copper, 

 18.00 % nickel, balance zinc) (0.040-in. stock). 



|- 70 

 I 60 

 .E 50 



% 40 



c 



D 



■^ 30 

 to 



■"i 20 



c 

 ^ 10 







20 30 40 50 60 70 80 90 100 



Rockwell Hardness B l^ie" Ball 100 Kg. Load 

 69 74 80 86 91 97 - - 



Rockwell Hardness F /le" Ball 60 Kg. Load 

 67 71 74 77 80 84 87 90 93 



Rockwell Hardness 15-T Vie" Ball 15 Kg. Load 

 29 36 43 50 57 64 70 76 82 



Rockwell Hardness 30T Vie" Ball 30Kg.Load 



Chart 26. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of 18 per cent nickel- 

 silver strip (66.00 % copper, 18.00 % silver, balance zinc) when only 

 Rockwell hardness is known. It is accurate for all thicknesses between 

 0.020 and 0.080 in. within the given limits. 



