38 



Copper and Copper-base Alloys 



0.001 0.002 0.003 0.004 0.005 

 S+rain, Inches per In. 



0.006 



Chakt 26. — The effect of cold working on the stress-strain charac- 

 teristics of commercial bronze (Government-gilding) strip (0.040 in. 

 thick) having a ready-to-finish grain size of 0.070 mm. (89.74 % 

 copper); 5,000-lb. capacity hydraulic testing machine and Templin 

 automatic extensometer accurate to 0.00001 in. used. 



Ex+r. 10 20 30 40 50 60 



Percent Reducfion by Cold Working 



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

 apparent elastic limit of commercial bronze (Government-gilding) 

 rod, previously annealed to a grain size of 0.050 mm. (89.99 % copper) 

 (rod under 1 in. in diameter). 



Ex+n 10 20 30 40 50 



Percent Reduction by Cold Working 



60 



Chart 28. — The effect of cold drawing on the Rockwell hardness, 

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

 commercial bronze (Government-gilding) rod, previously annealed to a 

 grain size of 0.050 mm. (89.99 % copper) (rod under 1 in. in diameter). 



Ex.tn 10 20 30 40 50 60 



Percent Reduction by Cold Working 



Chart 29. — The effect of cold drawing on the yield strength of 

 commercial bronze (Government-gilding) rod, previously annealed to a 

 grain size of 0.050 mm. (89.99 % copper) (rod under 1 in. in diameter). 



