162 



Copper and Copper-base Alloys 



100 



vo 



80 

 . 70 



r 60 

 ; 50 



! 40 



I 30 



20 



10 



Ex+n 10 20 30 40 50 



Percent ReducHon by Cold Drawing 



Chart 87. — The effect of cold drawing on the tensile strength and 

 apparent elastic lim it of low-lead naval-brass rod, previously annealed 

 to a grain size of 0.025 mm. (60.95 % copper, 1.03 % tin, 0.39 % lead, 

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



Extr 10 20 30 40 



Percent Reduction by CoId_Prawing 



Chabt 88. — The effect of cold drawing on the Rockwell hardness, 

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

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

 (60.95 % copper, 1.03 % tin, 0.39 % lead, balance zinc) (rod under 1 in. 

 in diameter). 



80 



70 



60 



50 



40 



O 30 



20 







Extn 10 20 30 40 50 



Percent l^eduction by Cold Drawing 



Chaet 89. — The effect of cold drawing on the yield strength of low- 

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

 (60.95% copper, 1.03% tin, 0.39% lead, balance zinc) (rod under 

 1 in. in diameter). 



CD 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Tempin Deg.Ff 1 Hr. at Temp.) 



Chart 90. — The effect of annealing on the tensile strength, apparent 

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

 cold-drawn 28 per cent (reduction of area) from material having a grain 

 size of 0.025 mm. (60.95 % copper, 1.03 % tin, 0.39 % lead balance 

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



