The Special Brasses 



187 



5 10 15 20 25 30 



Percen+ Reduction in Area by Cold Drawing 



Chakt 30. — The effect of cold drawing on the Rockwell hardness, 

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

 arsenical-brass rod, previously annealed to a grain size of 0.020 mna. 

 (56.28 % copper, 1.97 % nickel, 1.34 % iron, 0.98 % lead, 0.65 % arsenic, 

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



80 



70 

 60 



p 50 



in 

 w40 



Q- 



_] 



§30 

 o 



20 



10 — / 











30 



5 10 15 20 25 



Percent Reduction by Cold Work 

 Chart 32. — The effect of cold drawing on the yield strength of 

 arsenical-brass rod, previously annealed to a grain size of 0.020 mm. 

 (56.28 % copper, 1.97 % nickel, 1.34 % iron, 0.98 % lead, 0.65 % arsenic, 

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



a 



cn. 



110 



o 

 o 



- 100 



OQ 



"S 90 



70 



= 60 



5 10 15 20 25 30 



Percent Reduction in Area by Cold Drawing 



Chart 31. — The effect of cold drawing plus relief annealing at 

 575°F. for 45 min. on the Rockwell hardness, percentage elongation 

 in 2 in., and percentage reduction of area of arsenical-brass rod, previ- 

 ously annealed to a grain size of 0.020 mm. (56.28 % copper, 1.97 % 

 nickel, 1.34 % iron, 0.98 % lead, 0.65 % arsenic, balance zinc) (rod 

 under 1 in. in diameter). 



5 10 15 20 25 30 



Percent Reduction by Cold Work 



Chart 33. — The effect of cold drawing plus relief annealing at 

 575°F. for 45 min. on the yield strength of arsenical-brass rod, previ- 

 ously annealed to a grain size of 0.020 mm. (56.28 % copper, 1.97 % 

 nickel, 1.34 % iron, 0.98 % lead, 0.65 % arsenic, balance zinc) (rod 

 under 1 in. in diameter). 



