The Special Brasses 



177 



CD. 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deq.R ( 1 Hr at. Temp.) 



Chabt 1. — The effect of annealing on the tensile strength and 

 apparent elastic limit of aluminum-brass condenser tube, previously 

 cold-drawn SO per cent (reduction of area) from a grain size of 0.045 

 mm. (75.78 % copper, 2.54 % aluminum, 0.04 % arsenic, balance zinc). 



CD. 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp.in Deg.F(lhlna+ Temp.) 



Chart 2. — The effect of annealing on the Rockwell hardness, 

 percentage elongation in 2 in., and grain size of aluminum-brass con- 

 denser tube, previously cold-drawn 50 per cent (reduction of area) 

 from a grain size of 0.045 mm. (75.78 % copper, 2.54 % aluminum, 

 0.04 % arsenic, balance zinc) . 



100 

 ^ 90 



-" 60 

 o 

 o 

 2- 50 



i 40 



\ 30 



to 



_a; 20 



io 



5 10 







200 400 600 800 1000 1200 1400 1600 1800 

 Temperature in Deg.f:f IHr d+ Temp.) 



Chart 3. — The effect of elevated temperature on the tensile strength, percentage elongation in 2 in., and percentage reduction of area of 

 aluminum-brass rod (79.00 % copper, 2.52 % aluminum, 0.02 % iron, balance zinc) , previously cold-drawn 45 per cent (reduction of area) according 

 to Price"' (rod under 1 in. in diameter). 



