194 



Copper and Copper-base Alloys 



100 



90 



80 



30 



20 



11.0 20.7 29.4 37.2 44.0 300 55.5 60.5 64.8 68.6 

 Percent Reduction of Area by Rolling 

 01 23456789 10 

 B&S Numbers Hard 

 Chaet 7. — The effect of cold rolling on the yield strengths of 20 

 per cent nickel-silver strip, previously annealed to a grain size of 0.015 

 mm. (66.11 % copper, 21.13 % nickel, balance zinc) (0.040-in. stock) 



1 1.0 20.7 29.4 372 44.0 50.0 55.5 &Q5 64.8 656 

 Percent Reduction of Area by Rolling 

 01 2 345678910 

 BS-S Numbers Hard 



Chart 8. — The effect of cold rolling on the yield strengths of 20 

 per cent nickel-silver strip, previously annealed to a grain size of 

 0.070 mm. (66.11% copper, 21.1.3% nickel, balance zinc) (0.040-in. 

 stock). 



1000 1100 1200 1300 1400 



Anneoling Tennp. in Deg.F. f IHr at Temp.) 

 Chart 9. — The effect of annealing on the grain-growing charac- 

 teristics of 20 per cent nickel-silver strip, previously cold-rolled 6 B. & 

 S. Nos. (50 per cent reduction of area) from two different grain sizes, 

 0.015 and 0.070 mm. (66.11 % copper, 21.13 % nickel, balance zinc) 

 (0.040-in. stock). 



100 

 90 

 80 



B ™ 



^ 60 



u 



a 50 



o 

 S 30 



20 







Room 500 600 700 800 900 1000 1100 1200 1300 1400 

 Annealing Temp, in Deg.F.flHn at Tennp.) 



Ch-vrt 10. — -The effect of annealing on the tensile strength and 

 apparent elastic limit of 20 per cent nickel-silver strip, previously 

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

 different grain sizes, 0.015 mm. and 0.070 mm. (66.11 % copper, 

 21.13 % nickel, balance zinc) (0.040-in. stock). 



