110 



no 



100 



- 90 

 & 

 Z 80 



.^70 



8 60 

 o 



c 50 



£ 30 

 ^ 20 



E 10 



10 20 30 40 50 60 10 80 90 100 



Rockwell Hardness B /is" Ball 100 Kg. Load 

 57 63 69 74 80 86 91 97 - - - 



Rockwell Hardness F ^'le" Ball 60 Kg. Load 

 61 64 67 71 74 77 80 84 67 90 93 



Rockwell Hardness 15 T '/i6"BalI 15 Kg. Load 

 15 22 29 36 43 50 57 64 70 76 82 



Rockwell Hardness 30T ^le'Ball 30 Kg. Load 



Chart 62. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of engraver's brass 

 strip (63.37 % copper, 1.53 % lead, balance zinc), when only Rockwell 

 hardness is known. It is accurate for all thicknesses between 0.020 

 and O.OSO in. within the given limits. 



Copper and Copper-base Alloys 



35 



40 

 Shear Strength, 1000 Lb. per Sq.ln. 



45 



Chart 63. — Conversion chart for determination of shear strength 

 of engraver's brass (63.50 % copper, 1.50 % lead, balance zinc) when 

 tensile strength is known. Accurate to +5 %.''^' 



TABLE 7 

 RIVETING-TURNING ROD" 



Copper, 61.98%; lead, 1.42%; iron, 0.127o; 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 ia 



Reduction of area, % 



Rockwell hardness F, Jf g-in. ball, 60-kg. load 



Rockwell hardness B, Yi^-^n. 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 



Type structure 



Rod 



Hard' Soft' 



80 

 58 

 53 

 64 

 53 

 15 

 50 



105 

 84 



140 



50 

 13 

 17 

 17 

 15 

 49 

 63 

 78 

 33 

 70 



Forgings 



Cold<i 



51-55 

 22-28 

 27-35 

 27-35 

 22-28 

 42-38 

 62-57 

 85-90 

 46-56 

 80-101 



15,000,000 



1650 



0.0000204 



28 



73 



0.306 



' phase, alpha-beta 



" Thia alloy combines excellent machinability with fair cold-forging properties. 



^ Refers to rod cold-worked 40%; rod under 1 in. in diameter, ready-to-finish grain size, 0.040 i 



' Refers to 1100°F. anneal (1 hr.). 



<* Material cold-forged from soft rod (5-10% reduction of area). 



