Nickel Silvers 



203 



500 600 700 800 900 1000 1100 1200 1300 1400 

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



Chakt 37. — The effect of annealing on the yield strength of 18 

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

 Nos. (50 per cent reduction of area) from a grain size of 0.080 mm. 

 (56.56% copper, 17.77 % nickel, balance zinc) (0.040-in. stock). 



130 - 



120 

 110 h 



100 - 



& 90 



1/3 



•0) 80 



70 - 



60 



K 50 



S 40 



30 



20 







0.002 0.004 0.006 0.008 



Strain^ Inches per Inch 



Chart 39, — The effect of cold rolling on the stress-strain charac- 

 teristics of 18 per cent spring-stock 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. (56.56 % copper, 17.77 % nickel, balance 

 zinc.) 



40 50 60 70 80 90 100 



Rockwell Hardness B V\e Ball 100 Kg. Load 

 80 86 91 97 - 



Rockwell Hardness F Me Ball 60 Kg. Load 

 74 77 80 84 87 90 93 



Rockwell Hardness 15 T Me" Ball 15 Kg. Load 

 43 50 57 64 70 76 8Z 



Rockwell Hardness 30T V\6 Ball 30 Kg. Load 



Chaht 38. — This chart can be employed to determine the approxi- 

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

 silver (spring) strip (56.56 % copper, 17.77 % nickel, balance zinc) 

 when only Rockwell hardness is known. It is accurate for all thick- 

 nesses between 0.020 and 0.080 in. within the given limits. 



0002 0004 0006 Q008 



Strain, Inches per Inch 



Chart 40. — The effect of cold rolling on the stress-strain charac- 

 teristics of 18 per cent spring-stock 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. (56.56 % copper, 17.77 % nickel, balance 

 zinc.) 



