62 



Copper and Copper-base Alloys 



0.002 0.004 0.006 0.008 



S+rain Inches per In. 



Chart 102. — The effect of cold working on the stress-strain charac- 

 teristics of 70-30 (cartridge brass) strip (0.040 in. thick) having a 

 ready-to-finish grain size of 0.015 mm. (69.83% copper); 5,000-lb. 

 capacity hydraulic testing machine and Templin automatic extensom- 

 eter accurate to 0.00001 in. used. 



0.002 0.004 0.006 0.008 



S+rain, Inches per In. 



Chart 103. — The effect of cold working on the stress-strain charac- 

 teristics of 70-30 (cartridge brass) strip (0.040 in. thick) having a 

 ready-to-finish grain size of 0.070 mm. (69.83 % copper) ; 5,000-lb. 

 capacity hydraulic testing machine and Templin automatic extensom- 

 eter accurate to 0.00001 in. used. 



120 

 110 

 100 

 90 



30 



20 



10 



10 20 30 40 50 60 70 80 90 

 Percent Reduction in Area 



Chart 104. — The effect of cold drawing on the tensile strength 

 and apparent elastic hmit of 70-30 (cartridge brass) rod, previously 

 annealed to a grain size of 0.045 mm. (70.26 % copper) (rod under 1 in. 

 in diameter). 



10 20 30 40 50 60 70 80 

 Percent Reduction in Area 



Chart 105. — The effect of cold drawing on the Rockwell hardness, 

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

 70-30 (cartridge brass) rod, previously annealed to a grain size of 

 0.045 mm. (70.26 % copper) (rod under 1 in. in diameter). 



