The Tin Brasses 



157 



CD 400 500 600 700 800 900 1000 1100 1200 1500 

 Tempera+ure. Deg.f%riHr.a+ Temp.) 



Chabt 72. — The effect of annealing on the Rockwell hardness, 

 percentage elongation in 2 in., percentage reduction of area of Govern- 

 ment 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). 



70 



60 ^ 



50 



n 

 (^40 



30 



20 



500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg.EflHr.at Temp.) 



Chart 73. — The effect of annealing on the yield strength of Govern- 

 ment 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 imder 1 in. in diameter). 



-. 90 



cr 



1- 80 



D- 



rf 70 



8 60 



.E 50 



X 



"0140 



c 



w 



30 

 ^ 20 



£ 10 



100 200 300 400 500 600 700 800 

 Tempera+ure, Deg.l^ (IHr- a+ Temp.) 



Chart 74. — The effect of elevated temperature on the tensile 

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

 area of Government naval-brass rod, previously cold-worked 28 per cent 

 (reduction of area) from a grain size of 0.025 mm. (59.64 % copper, 

 0.66 % tin, balance zinc) (rod under 1 in. in diameter). 



40 41 42 43 44 45 



Shear S+reng+h, 1,000 Lb. per Sq. In. 



Chart 75. — Conversion chart for determination of shear strength 

 of Government naval brass (60 % copper, 0.75 % tin, balance zinc) 

 when tensile strength is known. Accurate to +5 %."'' 



