200 



Copper and Copper-base Alloys 



Q008 



0002 0004 Q006 



S+rai'n^ Inches per Inch 



Chart 27. — The effect of cold rolling on the stress-strain charac- 

 teristics of IS per cent deep-drawing 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 extensom- 

 eter accurate to 0.00001 in. used. (66.00 % copper, 18.00 % nickel, 

 balance zinc.) 







Q008 



Q002 Q004 0.006 

 Sfrain^ Inches per Inch 



Chart 28. — The effect of cold rolling on the stress-strain charac- 

 teristics of 18 per cent deep-drawing nickel-silver strip (0.040 in. 

 thick) having a ready-to-finish grain size of 0.070 mm.; 5,000-lb. 

 capacity hydraulic testing machine and Templin automatic extensom- 

 eter accurate to 0.00001 in. used. (66.00 % copper, 18.00 % nickel, 

 balance zinc.) 



TABLE 5 

 18 PER CENT NICKEL SILVER (SPRING STOCK) 



General Data — Strip" 

 Copper, 56.56%; nickel, 17.77%; zinc, balance 



Property 



Tensile strength, p.s.i. (000 omitted) 



Elongation, %in2in 



Apparent elastic limit, p.s.i. (000 omitted) 



Yield strength, 0.5 % extension, p.s.i. (000 omitted) 



Yield strength, 0.2 %, offset, p.s.i. (000 omitted) 



Yield strength, 0.1 % offset, p.s.i. (000 omitted) 



Rockwell hardness F, Jis-in- ball, 60-kg. load 



Rockwell hardness B, Jf g-in. ball, ICO-kg. load 



Rockwell hardness G, Jie-in. ball, 150-kg. load 



Rockwell hardness 15-T, J {e-in- ball, 15-kg. load 



Rockwell hardness 30-T, Jie-in. Ball, 30-kg. load 



Young's modulus of elasticity, p.s.i 



Endurance limit (at 10* reversals) :<^'^' 



Soft, p.s.i. (000 omitted) 



4 B. & S. Nos., hard, p.s.i. (000 omitted) 



10 B. & S. jSTos., hard, p.s.i. (000 omitted) 



Melting point, °F 



Density, lb. per cu. in 



Coefficient of expansion, per °C. from25-300°C 



Electrical conductivity, % I.A.C.S., 68°F 



Thermal conductivity, B.t.u. per sq. ft. per ft. per hr. per °F., 68°F 

 Specific gravity 



" All tests conducted on 0.040-in. stock. 



' 6 B. & S. Nos., hard, 0.080-0.015 mm. grain size at ready-to-finish, respectively, 



■= Refer to 1400°F. anneal (1 hr. at temperature). 



Hard" 



100-125 

 2-3 



78-99 



91-92 

 101-119 



93-109 

 112-115 



95-101 



72-84 



92- 



79- 



Soft' 



49-61 

 47-48 



17 

 20-22 

 20-22 

 20-22 



81 



44 



75 

 46 



18,000,000 



17.5 

 21.5 

 21.5 

 1930 

 0.314 

 0.0000150 

 5.56 



18 

 8.70 



