150 



Copper and Copper-base Alloys 



100 



90 

 c 

 ~ 80 



cr 



^ 70 

 a 



x; 60 



_i 



§ 50 



o 



40 

 30 

 20 

 10 

 



50 



5 10 15 20 25 30 35 40 45 

 Percent Reduction in Area 

 Chart 48. — The effect of cold drawing on the tensile strength and 

 apparent elastic limit of Tobin-bronze rod, previously annealed to a 

 grain size of 0.025 mm. (60.00 % copper, 0.74 % tin, balance zinc (rod 

 under 1 in. in diameter). 



3C 



^ 20 



en 







50 



10 15 20 25 30 35 40 45 



Percent Reduction in Area 



ChjVbt 49. — The effect of cold drawing on the Rockwell hardness, 



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



Tobin-bronze rod, previously annealed to a grain size of 0.025 mm. 



(60.00 % copper, 0.74 % tin, balance zinc) (rod under 1 in. in diameter). 



10 20 30 40 50 



Percent Reduction by Cold Working 



Chart 50. — The effect of cold drawing on the yield strength of Tobin- 

 bronze rod, previously annealed to a grain size of 0.025 mm. (60.00 % 

 copper, 0.74 % tin, balance zinc) (rod under 1 in. in diameter). 



100 



90 



^" 80 



D- 

 00 

 i. 70 



<u 



^ 60 



§ 50 



o 



~ 40 



30 



20 

 10 



CD 400 500 600 700 800 900 1000 1100 1200 1500 1400 

 Temp, in Deg. F. (] Hr. at Temp.) 



Chart 51. — The effect of annealing on the tensile strength, apparent 

 elastic limit, and grain size of Tobin-bronze rod, previously cold-drawn 

 30 per cent (reduction of area) from material having a grain size of 

 0.025 mm. (60.00 % copper, 0.74 % tin, balance zinc) (rod under 1 in. 

 in diameter). 



