220 



Copper and Copper-base Alloys 



qo 



.80 

 •70 

 60 

 50 

 "40 

 30 

 ZO 



r.o 



400 500 600 700 800 900 1000 IIOO 1200 1300 1400 

 Annealing Temp, in Deg. F. (1 Hr. a+ Tenip.) 



Chart 93. — The effect of annealing on the yield strength of 5 per 

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

 cent reduction of area) from a gram size of 0.110 mm. (G3.55 % copper, 

 5.14 % nickel, balance zinc) (0.043-in. stock). 



c ■ 

 o — 



o -^- 

 <=. C 

 — 0) 



1° 

 ^% 



to LjJ 



100 

 90 

 80 

 70 

 60 

 50 

 40 

 30 

 20 

 10 



100 



10 20 30 40 50 60 70 80 90 



Rockwell Hardness BVie'Eal! 100 Kg. Load 

 57 63 69 74 80 86 91 97 



Rockwell Hardness F "/is" Ball 69 Kg. Load 

 61 64 67 71 74 77 80 84 87 90 



Rockwell Hardness 15-TVi6"Ball ISKg.Load 

 15 22 29 36 45 50 57 64 70 76 



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



Chart 94. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of 5 per cent nickel- 

 silver strip (63.55 % copper, 5.14 % nickel, balance zinc) when only 

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

 0.020 and O.OSO in. within the given limits. 



93 



82 



too 



90 

 c 80 



t. 

 (D 



0.60 



o50 

 o 



S40 



to* 



10 



S! 30 



to 

 20 



0.002 0.004 0.006 0.008 0.010 



5+rain^ Inches per In 



Chart 95. — The effect of cold rolling on the stress-strain charac- 

 teristics of 5 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. (63.55 % copper, 5.14 % nickel, balance zinc.) 



0002 0004 0.006 0.008 



Strain^ Inches per In. 



Chart 93. — The effect of cold rolling on the stress-strain charac- 

 teristics of 5 per cent nickel-silver strip (0.040 in. thick) having a 

 ready-to-finish grain size of 0.110 mm.; 5,000-lb. capacity hydraulic 

 testing machine and Templin automatic extensometer accurate to 

 0.00001 in. used. (63.55 % copper, 5.14 % nickel, balance zinc.) 



