The Leaded Brasses 



101 



Copper, 63.f 



TABLE 4 

 LEADED -BRASS ROD 



)%; lead, 1.38%; iron, 0.10%; zinc, balance 



Property 



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, % in 2 in 



Reduction of area, % 



Rockwell hardness F, He-™- ball, 60-kg. load 



Rockwell hardness B, Ks-in. ball, 100-kg. load 



BruieU hardness, 10-mm. baU,-500-kg. load 



Modulus of elasticity, p.s.i 



Melting point, °F 



Coefficient of expansion, per °C. from 25-300°C 



Electrical conductivity, % I.A.C.S 



Thermal conductivity, B.t.u. per sq. ft. per ft. per hr. per °F., 68°F 



Density, lb. per cu. in. 



Type structure 



*» Refers to rod cold-worked 38 % ; rod under 1 in. in diameter, ready-to-finish grain size, 0.035-0.045 



' Refers to 1100°F. anneal (1 hr.). 



« Material cold-forged from soft rod (5—20 % reduction of area). 



Rod 



Forgings 



100 

 90 

 - 80 

 70 

 60 

 50 

 40 

 50 

 20 

 10 



Extr. 



60 



10 20 30 40 50 



Percent Reduction by Cold Working 



Chaet 33. — The effect of cold drawing on the tensile strength and 

 apparent elastic limit of leaded high-brass rod, previously e.xtruded 

 to a grain size of 0.045 mm. (63.89 % copper, 1.38 % lead, balance zinc) 

 (rod under 1 in. in diameter). 



110 

 100 

 90 

 80 

 70 

 60 

 50 

 40 

 30 

 20 

 10 



Extn 



10 20 30 40 50 



Percent Reduction by Cold Drawing 



60 



Ch.-vrt 34. — The effect of cold drawing on the Rockwell hardness, 

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

 leaded high-brass rod, previously extruded to a grain size of 0.045 mm. 

 (63.89 % copper, 1.38 % lead, balance zinc) (rod under 1 in. in diam- 

 eter). 



