30 



Copper and Copper-base Alloys 



TABLE 1 

 GILDING METAL 



Copper, 94.59%; iron, trace; zinc, balance 



Property 



Hard" 



Soft" 



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



Elongation," %in2in 



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) 



Rockwell hardness F, Kg-in. ball, 60-kg. load" 



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



Rockwell hardness G, ^g-in. ball, 150-kg. load" 



Rockwell hardness 15-T, ^f g-in. ball, 15-kg. load" 



Rockwell hardness 30-T, }^Q-ia. ball, 30-kg. load" 



Young's modulus of elasticity, p.s.i . 



Melting point, °F 



Density, lb. per cu. in 



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



Electrical conductivity, (^w % I.A.C.S., 68°F 



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



<» 6 B. & S. Nos., hard, 0.070-0.015 mm. grain size at ready-to-finish, respectively. 



^ Refers to 900°F. anneal (1 hr. at temperature). 



' Apply to strip only (all tests conducted on 0.040-in. stock). 



58-63 



4 

 48-55 

 54-58 

 54-60 

 51-57 

 95-100 

 62-73 

 21-38 

 81-83 

 58-66 



15,000,000 



1950 



0.320 



0.0000181 



57 



139 



36-38 

 45 

 5-9 

 8-13 

 8-13 

 8-13 



52-63 

 0-8 



70 



60 



50 



.^40 



30 



C J. 



20 







11.0 20.7 29.4 372 44.0 50.0 55.0 60.5 64& 68.6 

 Percent Reduc+ion o+ Area by Rolling 

 01 2 3456789 10 

 BZ<S Numbers Hard 



Chart 1. — The effect of cold rolling on the tensile strength and 

 apparent elastic limit of gilding-metal strip, previously annealed to 

 two different grain sizes, 0.015 and 0.070 mm. (94.59 % copper) (0.040- 

 in. stock). 



"110 

 I 100 

 i 90 

 ^ 80 

 ' 70 

 60 



^ ID 



^=-^ 50 

 c I 



O w 



^ c 



c ^ 30 

 o o 

 u X 



= 20 



<u 



i 10 

 u 



.2 



II.O 20.7 29.4 372 44.0 50.0 55.5 60.5 64.& 6a6 

 Percent Reduc+ion of Area by Rolling 

 01 23456789 10 

 B?,S Numbers Hard 



Chart 2. — The effect of cold rolling on the Rockwell hardness and 

 percentage elongation in 2 in. of gilding-metal strip, previously 

 annealed to two different grain sizes, 0.015 and 0.070 mm. (94.59 % 

 copper) (0.040-in. stock). 



