172 



Copper and Copper-base Alloys 



100 

 90 

 80 



-I 40 

 o 



i 30 

 20 



11.0 2a7 29.4 37.2 44.0 50.0 55.5 60.5 64.8 6a6 

 Percen+ Reduction of Area by Rolling 

 0123456789 10 

 B5^S Numbers Hard 



Ch.4BT 117. — The effect of cold rolling on the yield strengths of 

 modified manganese-bronze strip, previously annealed to a grain size 

 of 0.015 mm. (61.51 % copper, 0.47 % tin, 0.15 % iron and manganese, 

 balance zinc) (0.040-in. stock). 



100 



80 



t 70 



& ^ 

 ^ 60 



1- 



(U 



^ 50 

 ji 



o 



2 30 



20 



11.0 20.7 294 372 44.0 5O0 55.5 605 64.8 68.6 

 Percent Reduction of Area by Rolling 

 0123456789 10 

 B&S Numbers Hard 



Chart 118. — The effect of cold rolling oh the yield strengths of 

 modified manganese-bronze strip, previously annealed to a grain size 

 of 0.080 mm. (61.51 % copper, 0.47 % tin, 0.15 % iron and manganese, 

 balance zinc) (0.040-in. stock). 



110 

 100 

 90 

 80 

 ^70 

 >^60 



j5 



-" 40 

 o 



o 30 

 20 



10 







CR 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg.R f IHr at Temp.) 



Chart 119. — The effect of annealing on the tensile strength and 

 apparent elastic limit of modified manganese-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. (61.51 % copper, 0.47 % tin, 

 0.15 % iron and manganese, balance zinc) (0.040-in. stock). 



900 1000 IIOO 1200 1300 



Annealing Temp.in Deg. FflHrat Tempi) 



Chart 120. — The effect of annealing on the grain-growing characteris- 

 tics of modified manganese-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. (61.51% copper, 0.47% tin, 0.15% iron and 

 manganese, balance zinc) (0.040-in. stock). 



