Nickel Silvers 



215 



500 600 700 800 900 1000 1100 1200 1300 1400 

 Annealing Temp, in Deg.F: (iHr.at Temp.) 

 Chaht 77. — The effect of annealing on the yield strength of 10 

 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. (66.02 % 

 copper, 10.73 % nickel, balance zinc) (0.040-in. stock). 



0.002 



0.010 



0.004 0.006 0.008 

 Strain-Inches per Inch 

 Chart 79. — The effect of cold rolling on the stress-strain charac- 

 teristics of 10 per cent nickel-silver strip (0.040 in. thick) having a 

 ready-to-finish grain size of 0.015 mm.; 5,000-lb. capacity hydraulic 

 testing machine and Templin automatic extensometer accurate to 

 0.00001 in. used. (66.02 % copper, 10.73 % nickel, balance zinc.) 



£ 100 



<^ qo 



^ r 



--S60 



x"^ 50 



S-^40 

 ^- en 

 '^ g 30 



~ UJ 



- 20 

 •- 10 



10 20 30 40 50 60 70 80 90 100 



Rockwell Hardness B '/le" Ball 100 Kg. Load 

 65 69 74 80 86 QI 97 - 



Rockwell Hardness F '/is" Ball 60 Kg. Load 

 64 67 71 74 77 80 84 87 90 93 



Rockwell Hardness 15-T '/i6"Ball 15 Kg. Load 

 22 29 36 43 50 57 64 70 76 82 



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



Chart 78. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of 10 per cent nickel- 

 silver strip (66.02 % copper, 10.73 % 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. 







0.002 



0.010 



0.004 0.006 0.008 

 Strain Inches .per Jnch 

 Chart 80. — The effect of cold rolling on the stress-strain charac- 

 teristics of 10 per cent nickel-silver strip (0.040 in. thick) having a 

 ready-to-finish grain size of 0.080 mm.; 5,000-lb. capacity hydraulic 

 testing machine and Templin automatic extensometer accurate to 

 0.00001 in. used. (66.02 % copper, 10.73 % nickel, balance zinc.) 



