Nickel Silvers 



211 



,Room400 b^O 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg. Y.{\Wr. a\ Temp.) 



Ch^\.ht 63. — The effect of annealing on the Rockwell hardness and 

 percentage elongation in 2 in. of 12 per cent nickel-silver strip, pre^d- 

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

 two different grain sizes, 0.015 and 0.080 mm. (66.24 % copper, 11.57 % 

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



110 

 100 

 90 



E 80 



^ 70 



I. 60 

 d 

 -" 50 



3. 40 



30 



20 



400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg.F fl Hn at Temp.) 



Chaet 64. — The effect of annealing on the yield strength of 12 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. (66.24 % copper, 

 11.57 % nickel, balance zinc) (0.040-in. stock). 



Annealing Temp, in Deg. F. (1 Hn at Temp.) 



Chart 65. — The effect of annealing on the yield strength of 12 per 

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

 cent reduction of area) from a grain size of 0.080 mm. (66.24 % copper, 

 11.57 % nickel, balance zinc) (0.040-in. stock). 



O C 



X^ 



20 30 40 50 60 70 80 90 100 



Rockwell Hcjrdness B'/i6"Ball 100 Kg. Load 

 69 74 80 86 qr 97 - - - 



Rockwell Hardness F '/i6"BaIl 60 Kg. Load 

 67 71 74 77 80 84 87 90 93 

 Rockwell Hardness IST Vie" Ball 15 Kg. Load 

 29 36 43 50 57 64 70 76 82 

 Rockwell Hardness 50-T'/i6"Ball 30 Kg. Load 

 Chart 66. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of 12 per cent nickel- 

 silver strip (66.24 % copper, 11.57 % nickel, 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. 



