224 



Copper and Copper-base Alloys 



120 



'110 



100 



90 



, 80 



70 



60 



50 



40 



10 



20 



10 



CR 600 700 ?,W 900 1000 1100 1200 1500 1400 1500 

 Annealing Temp. i"n Dcg.Ff IHn a+ Temp.) 



Chart 103. — The effect of annealing on the Rockwell hardness and 

 percentage elongation in 2 in. of 12 per cent nickel-silver— leaded strip, 

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

 from two different grain sizes, 0.015 and 0.060 mm. (65.49 % copper, 

 (12 11 % nickel, 1.96 % lead, balance zinc) (0.040-in. stock). 



600 700 _ 800 900 1000 1100 1200 1300 1400 1500 

 Annealing Temp, in Deg.F, (I Hr. a+ Temp.) 



Chart 104. — The effect of annealing on the yield strength of 12 

 per cent nickel-silver— leaded strip, previously cold-roUed 6 B. & S. 

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

 (65.49% copper, 12.11% nickel, 1.96% lead, balance zinc) (0.040-in. 

 stock) . 



100 



90 



80 



70 

 c 

 ": 60 



cr 

 fe 50 



Q. 



ja 40 



I 



o 



o 30 

 o 



20 

 10 



600 700 800 900 1000 1100 1200 1300 1400 1500 

 Annealing Temp, in Deg.FflHr: a+ Temp.) 



Chart 105. — The effect of annealing on the yield strength of 12 

 per cent nickel-sUver— leaded strip, previously cold-rolled 6 B. & S. 

 Nos. (50 per cent reduction of area) from a grain size of 0.060 mm. 

 (65.49 % copper, 12.11 % nickel, 1.96 % lead, balance zinc) (0.040-in. 

 stock) . 



.00 



90 



. 80 

 C 



CN 70 



c 



i;: 60 



c 



(U 



t 50 



^4o 



c 

 o 



^ 30 

 o 

 cy 

 I 20 



Lu 



10 







20 30 40 50 60 70 80 90 100 



Rockwell Hardness B J^ie'Ball iOOK'g.Load 

 69 74 80 86 91 97 - 



Rockwell Hardness F 'A6"Ba]] 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 yi6"Ball 30 Kg. Load 



Chart 106. — This chart can be employed to determine the approxi- 

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

 silver-leaded strip (65.49 % copper, 12.11 % nickel, 1.96 % lead, 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. 



