164 



Copper and Copper-base Alloys 



100 

 90 

 80 

 70 



60 



50 



^ 40 



30 



20 



Extr 10 20 30 40 50 



Percen-f- Reduction by Cold Drawing 



Chart 93. — The effect of cold drawing on the tensile strength and 

 apparent elastic limit of medium-leaded naval-brass rod, previously 

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

 0.72 % lead, balance zinc) (rod under 1 in. in diameter). 



Ex+r 10 20 30 40 50 



Percen+ Reduction by Cold Drawing 



Chart 94. — The effect of cold drawing on the Rockwell hardness, 

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

 medium-leaded naval-brass rod, previously annealed to a grain size 

 of 0.025 mm. (60.95 % copper, 0.03 % tin, 0.72 % lead, balance zinc) 

 (rod under 1 in. in diameter). 



Ex+r. 10 20 30 40 50 



Percent Reduction by Cold Drawing 



Chart 95. — The effect of cold drawing on the yield strength of 

 medium-leaded naval-brass rod, previously annealed to a grain size 

 of 0.025 mm. (60.95 % copper, 1.03 % tin, 0.72 % lead, balance zinc) 

 (rod under 1 in. in diameter). 



CD 400 500 600 700 800 900 1000 iiOO 1200 1300 

 Annealing Temp, in Deg.HflHrat Temp.) 



Chart 96. — The efTect of annealing on the tensile strength, apparent 

 elastic limit, and grain size of medium-leaded naval-brass rod, previ- 

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

 a grain size of 0.025 mm. (60.95% copper, 1.03% tin, 0.72% lead, 

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



