138 



Copper and Copper-base Alloys 



1 1.0 20.7 29.4 37.2 44.0 50.0 55.5 60.5 648 68.6 

 Percent Reduction of Area by Polling 

 01 2345678 9 10 

 B S/ 5 Numbers Hard 



Chart 13. — The effect of cold rolling on the yield strengths of chain- 

 bronze strip, previously annealed to a grain size of 0.015 mm. (87.58 % 

 copper, 0.86% tin, balance zinc) (0.040-in. stock). 



90 



80 



11.0 20.7 29.4 372 AA.Q 500 55.5 60.5 64.8 68,6 

 Percent Reduction of Area by Rolling 

 01.2 345 6789 10 

 B S- S Numbers Hard 



Chart 14. — The effect of cold rolling on the yield strengths of chain- 

 bronze strip, previously annealed to a grain size of 0.080 mm. (87.58 % 

 copper, 0.86% tin, balance zinc) (0.040-in. stock). 



0.100 

 Q090 

 0.0 80 

 0.070 

 • 0.060 

 £ 0.0 50 

 0.040 

 0030 

 0.020 

 0.010 







900 1000 1100 1200 1300 1400 



Annealing Temp, in Deg.F f 1 Hr. at Temp.) 



Chart 15. — The effect of annealing on the grain-growing character- 

 istics of chain-bronze strip, previously cold-rolled 6 B. & S. Nos. (50 

 per cent reduction of area) from two different grain sizes, 0.015 and 

 0.080 mm. (87.58% copper, 0.86% tin, balance zinc (0.040-in. stock). 



I/) 



O 



CR 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp.in Deg. FflHr at Temp.) 



Chart 16. — The effect of annealing on the tensile strength and 

 apparent elastic limit of chain-bronze strip, previously cold-rolled 

 6 B. & S. Nos. (50 per cent reduction of area) from two different grain 

 sizes, 0,015 and 0.080 mm. (87.58 % copper, 0.86 % tin, balance zinc) 

 (0.040-in. stock). 



