122 



Copper and Copper-base Alloys 



CD 



400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg. F. f 1 Hr. a+ Temp.) 



Chart 99. — The effect o£ annealing on the yield strength of deep- 

 drilling rod, previously cold-drawn 30 per cent (reduction of area) 

 from extruded material having a grain size of 0.050 mm. (62.11 % 

 copper, 4.00 % lead, balance zinc) (rod under 1 in. in diameter). 



0.002 0.004 0.006 0.008 

 Strain, Inches per In. 



Chart 100. — The effect of cold drawing on the stress-strain charac- 

 teristics of deep-drilling rod (under 1 in. in diameter), previously 

 extruded to a grain size of 0.050 mm. 100,000-lb. capacity hydraulic 

 testing machine and Templin automatic extensometer accurate to 

 0.00001 in. used. (62.11 % copper, 4.00 % lead, balance zinc.) 



TABLE 12 

 BRASS FORGING ROD" 



Copper, 60.05%; lead, 2.12%; iron, trace; 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-in. ball, 60-kg. load 



Rockwell hardness B, Hs-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 hr. per ft. per °F., 68°F. 



Density, lb. per cu. in 



Forging range, °F 



Forging quality 



Type structure 



Rod 



Hard' Soft' 



66 

 44 

 50 

 50 

 39 

 25 

 50 

 99 

 73 

 116 



56 

 18 

 21 

 21 

 21 

 45 

 54 

 84 

 43 

 77 



Forgings 



Hot 



50-33 

 11-15 

 16-19 

 15-19 

 14-18 

 55-50 

 50-57 

 73-78 

 30-36 

 67-71 



Cold-* 



57 

 25 

 31 

 28 

 24 

 40 

 55 

 87 

 50 

 83 



15,000,000 



1640 



0.0000208 



28.6 



73 



0.305 



1250-1450 



Excellent 



Two phase, alpha-beta 



» This alloy combines excellent hot-forging properties with good : 

 t Refers to rod cold-worked 17.5% from the extruded condition; 

 ' Extruded condition (800°F. 1 hr.). 

 '' Material cold-struck from hot-forged condition. 



, diameter with a ready-to-finish grain f 



