156 



Copper and Copper-base Alloys 



100 



90 



. 80 



c 



& 70 



w 60 



5Q 



o 40 



30 



20 



5 10 15 20 25 30 35 40 45 50 



Percent Reduction I'n Area 



Chabt 68. — The effect of cold drawing on the tenaile strength and 



apparent elastic limit of Government naval-brass rod, previously 



annealed to a grain size of 0.025 mm. (59.64 % copper, 0.66 % tin, 



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



5 10 15 20 25 30 35 40 45 50 

 Percent Reduction in Area 

 Chart 69. — The effect of cold drawing on the Rockwell hardness, 

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

 Government naval-brass rod, previously annealed to a grain size of 

 0.025 mm. (59.64 % copper, 0.66 % tin, balance zinc) (rod under 1 in. 

 in diameter). 



90 



80 



70 



20 



10 20 30 40 50 



Percenl- Reduction by Cold Working 



Chart 70. — The effect of cold drawing on the yield strength of 

 Government naval-brass rod, previously annealed to a grain size of 

 0.025 mm. (59.64 % copper, 0.66 % tin, balance zinc) (rod under 1 in. 

 in diameter). 



90 



80 



70 



•Seo 



a* 

 I/) 

 l50 



240 



§30 



o 



"''20 



10 







CD 400 500 600 700 800 900 1000 ilOO 1200 1300 

 Annealing Temperature in Deg.K (iHr.at Temp.) 



Chart 71. — The effect of annealing on the tensile strength, apparent 

 elastic limit, and grain size of Government naval-brass rod, previously 

 cold-drawn 28 per cent (reduction of area) from material having a grain 

 size of 0.025 mm. (59.64 % copper, 0.66 % tin, balance zinc) (rod under 

 1 in. in diameter). 



