The Brasses 



53 



Oi 



400 500 600 700 800 900 1000 1100 1200 1300 1400 

 Annealing Temp, in Deg.F ( I Hr. a\ Temp.) 



Chart 75. — The effect of annealing on the percentage elongation 

 in 2 in., Rockwell hardness, and grain size of 80-20 (low-brass) tubing, 

 previously cold-worked 70 per cent (reduction of area) from a grain 

 size of 0.025 mm. (79.74 % copper). 



60 



50 



40 



-30 



20 



100 200 300 400 500 600 700 800 900 1000 1100 1200 

 Temp, in Deg.F; (IHr; a+ Temp.) 



Chart 76. — The effect of elevated temperature on the Izod-impact 

 strength of previously annealed 80-20 (low-brass) according to D. 

 Bunting.''* 



30 



40 

 Shear S+reng+h, 1000 Lb. per Sq.ln. 



50 



Chart 77. — Conversion chart for determination of shear strength of low brass (80 % copper, balance zinc) when tensile strength is known. 



Accurate to +5 %.'*«' 



