248 



Copper and Copper-base Alloys 



80 



60 



50 



-. 40 



30 



- 20 



CD 500 600 700 800 TOO 1000 1100 1200 1300 1400 

 Anneah'ng Temp. in Deg.Ef 1 Hr. a+ Temp.) 



Chart 25. — The effect of annealing on the yield strength of Type B 

 silicon-bronze rod, previously cold-drawn 50 per cent (reduction of 

 area) from material having a grain size of 0.115 mm. (1.76% silicon, 

 0.35% manganese, balance copper) (rod under 1 in. in diameter). 



0.002 0.004 0.006 0.008 



S+rain^ Inches per In. 



Chart 26. — The effect of cold drawing on the stress-strain charac- 

 teristics of Type B silicon-bronze rod (under 1 in. in diameter) 

 having a ready-to-finish grain size of 0.115 mm.; 100,000-lb. capacity 

 hydraulic testing machine and Templin automatic extensometer accu- 

 rate to 0.00001 in. used. (1.76 % silicon, 0.35 % manganese, balance 

 copper.) 



8.6 



10 



11.0 20.7 372 50.0 605 



Percent Reduction of Area by Rolling 

 12 4 6 8 



B5cS Numbers Hard 

 Chart 27. — The effect of cold rolling on the tensile strength and 

 apparent elastic limit of Type B silicon-bronze strip (2.10 % silicon, 

 0.24 % tin, balance copper) (0.040-in. stock). 



^ 120 

 I 110 



i 100 



c 

 "5 90 



5 



n: 

 = 80 



0) 



^ 70 

 o 

 o 



^ 60 



^ 50 



c 



'^ 40 



c 



s 



fc 30 



20 



o^ 10 

 o 



LU 



11.0 



68.6 



10 



-- 20.7 37. Z 50.0 60.5 



Percent Reduction of Area by Rolling 

 I Z 4 6 8 



B&S Numbers Hard 

 Chart 28. — The effect of cold rolling on the Rockwell hardness and 

 percentage elongation in 2 in. of Type B silicon-bronze strip (2.10% 

 silicon, 0.24 % tin, balance copper) (0.040-in. stock). 



