186 



Copper and Copper-base Alloys 



TABLE 4 

 ARSENICAL BRASS- 



General Data — Rod 

 Copper, 56.28%; nickel, 1.97%; iron, 1.34%; lead, 0.98%; arsenic, 0.65%; zinc, balance 



Propert}' 



Tensile strength, p.s.i. (000 omitted) 



Apparent elastic limit, p.s.i. (000 omitted) 



Yield strength, 0.5 % extension, p.s.i. (000 omitted) 

 Yield strength, 0.2% offset, p.s.i. (000 omitted). . . . 

 Yield strength, 0.1 % offset, p.s.i. (000 omitted). . . . 



Elongation, %in2in 



Reduction of area, % 



Rockwell hardness F, }>ie-m. ball, 60-kg. load 



Rockwell hardness B, Jfe-ii'. ball, 100-kg. load 



BrineU hardness, 10-mm. ball, 500-kg. load 



Modulus of elasticity, p.s.i 



Melting point, °F 



Density, lb. per eu. in 



Forging range, "F 



Forging quality 



Type structure 



Rod 



Hot 



65-70 

 17-25 

 37-22 

 40-23 

 34-20 

 40-30 

 30-35 

 85-95 

 55-65 

 89-102 



16,000,000 

 1630 

 0.302 



1200-1450 



Excellent 

 Two phase, alpha-beta 



° This alloy has excellent hot-working properties. Because of its structural characteristics it 

 forging, or upsetting. The presence of 0.60 % of lead materially aids machining. 



'' Refers to rod cold-drawn 23 % from extruded condition; rod under 1 in. in diameter with a ready-to-fi 

 « Refers to 1300°F. anneal (1 hr.). 



not recommended for operatio 

 h grain size of 0.020 : 



I involving cold forming, 



5 10 15 20 25 30 



Percent Reduction in Area by Cold Drawing 



Chart 28. — The effect of cold drawing on the tensile strength and 

 apparent elastic limit of arsenical-brass rod, previously annealed to a 

 grain size of 0.020 mm. (56.28 % copper, 1.97 % nickel, 1.34 % iron, 

 0.98 % lead, 0.65 % arsenic, balance zinc) (rod under 1 in. in diameter). 



100 



90 



80 



^70 



c^60 



.Q 



-J 40 

 o 

 o 

 o 30 



20 







5 10 15 20 25 30 



Percent Reduction in Area by Cold Drawing 



Chart 29. — The effect of cold drawing plus relief annealing at 

 575°F. for 45 min. on the tensile strength and apparent elastic limit 

 of arsenical-brass rod, previously annealed to a grain size of 0.020 mm. 

 (56.28 % copper, 1.97 % nickel, 1.34 % iron, 0.98 % lead, 0.65 % arsenic, 

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



