166 



Copper and Copper-base Alloys 



100 



■ 90 



80 



n 70 



& 

 "^ 60 



1- 



o- 50 



o 40 



o 



o 



-- 30 



20 



10 







10 20 30 40 50 



Percent Reduction by Cold Working 



Chaet 99. — The effect of cold drawing on the tensile strength and 

 apparent elastic limit of high-lead naval-brass rod, previously annealed 

 to a grain size of 0.025 mm. (59.66 % copper, 1.02 % tin, 2.06 % lead, 

 balance zinc) (rod under 1 in. in diameter). 



^110 





 ^ 100 



ch 



^ 90 

 o 

 u> 

 u- 80 



^ 70 



- ID 



^ 60 

 w 

 S 50 



I 40 

 o 



X 



_ 30 



<u 

 i 20 



u 



o 

 Ck 10 







10 20 30 40 50 



Percen+ Reduction by Cold Working 



Chaet 100. — The effect of cold drawing on the Rockwell hardness, 

 percentage elongation in 2 in., and percentage reduction of area of 

 high-lead naval-brass rod, previously annealed to a grain size of 0.025 

 mm. (59.66 % copper, 1.02 % tin, 2.06 % lead, balance zinc) (rod under 

 1 in. in diameter). 



10 20 1,0 40. 50 



Percent Reduction by Cold Working 



Chart 101. — The effect of cold drawing on the yield strength of 

 high-lead naval-brass rod, previously annealed to a grain size of 

 0.025 mm. (59.66 % copper, 1.02 % tin, 2.06 % lead, balance zinc) (rod 

 under 1 in. in diameter). 



90 



80 



70 



^60 



cr 



oo 



u 50 

 (^ 



^40 



§30 



o 



""20 



10 







CD 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg. P (1 Hn at Temp.) 



Chart 102. — The effect of annealing on the tensile strength, apparent 

 elastic limit, and grain size of high-lead naval-brass rod, previously 

 cold-drawn 30 per cent (reduction of area) from material having a grain 

 size of 0.025 mm. (59.66 % copper, 1.02 % tin, 2.06 % lead, balance 

 zinc) (rod under 1 in. in diameter). 



