118 



Copper and Copper-base Alloys 



TABLE 10 

 LOW-LEADED BRASS ROD- 



Copper, 62.95%; lead, 0.60%; iron, 0.05%; zinc balance 



Property 



Rod 



Hard'' Soft' 



Forgings 



Cold-* 



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, Jie-™. ball, 60-kg. load 



Rockwell hardness B, J^Jg-in. ball, 100-kg. load 



Brinell hardness, 10-mm. ball, 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., 68°F 



Thermal conductivity,'^" B.t.u. per sq. ft. per ft. per hr. per °F., 68°F 

 Density, lb. per cu. in 



67 



49 



42 



54 



46' 



19 



60 



101 

 76 



122 



46 

 10 

 14 

 13 

 13 

 55 

 70 

 69 

 25 

 64 



50-60 

 20-45 

 25-42 

 25^5 

 18-35 

 45-25 

 70-60 

 78-98 

 45-72 

 79-114 



15,000,000 



1660 



0.0000204 



26.8 



69 



0.306 



o This alloy is designed for operations involving intermediate cold working and free-cutting properties. 

 *■ Refers to rod cold-drawn 30%; rod under 1 in. in diameter, ready-to-finish grain size, 0.030 mm. 

 '^ Refers to 1300°F. anneal (1 hr.), 

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



Ex+r. 10 20 30 40 50 60 



Percen+ iJeduc'tion by Cold Working 



Chart 88. — The effect of cold drawing on the tensile strength and 

 apparent elastic limit of low-leaded brass rod, previously extruded to a 

 grain size of 0.030 mra.( 62.95% copper, 0.60% lead, balance zinc) 

 (rod under 1 iB. in diameter). 



Extr. 10 20 30 40 50 &Q 



Perceti+ Reduc+ion by Cold Working 



Chart 89. — The effect of cold drawing on the Rockwell hardness, 

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

 low-leaded brass rod, previously extruded to a grain size of 0.030 mm. 

 (62.95 % copper, 0.60 % lead, balance zinc) (rod under 1 in. in diam- 

 eter). 



