18 



Copper and Copper-base Alloys 



TABLE 6 

 ARSENICAL (TOUGH-PITCH) COPPER 



General Data — Sheet and Strip" 

 Copper, 99.50%; arsenic, 0.45% 



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, %in2in 



Endurance limit, p.s.i. (000 omitted) 



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



Rockn'ell hardness B, J-f 6-™- ball, 100-kg. load 



Rockwell hardness 15-T, ^^iQ-in. ball, 15-kg. load 



Rockwell hardness 30-T, He-in. ball, 30-kg. load 



Modulus of elasticity, p.s.i 



Melting point, °F 



Density, lb. per cu. in 



Coefficient of e.xpansion, 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 



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



' 6 B. & S. Nos., hard, 0.050-0.020 mm. grain size at ready-to-finish. 



^ Refers to 1100°F. anneal (1 hr. at temperature). 



Hard" 



Soft" 



50 



.40 



30 



20 



11.0 20.7 2q.4 57.2 44.0 50.0 55.5 60.5 64.8 68.6 

 Percen-1 Reduction of Area by Rolling 

 01 23456789 10 

 Band S Numbers Hard 

 Chabt 46. — The effect of cold rolling on the tensile strength and 

 apparent elastic limit of arsenical tough-pitch copper strip previously 

 annealed to two different grain sizes, 0.020 and 0.050 mm. (99.50 % 

 copper, 0.45 % arsenic) (0.040-in. stock). 



i^lOO 



90 



^80 

 o 



—I 



di70 



o 

 ^ 60 



"o 50 



"40 



I 30 

 I 20 



J '0 



u 



§. 



Il.O 20.7 29.4 37.2 44.0 50.0 555 50.5 64.8 68.6 

 Perceni Reduc+ion of Area by Rolling 

 1 2345 6 78 910 

 B and S Numbers Hard 

 Chart 47. — The effect of cold rolling on the Rockwell hardness and 

 percentage elongation in 2 in. of arsenical tough-pitch copper strip 

 previously annealed to two different grain sizes, 0.020 and 0.050 mm. 

 (99.50 % copper, 0.45 % arsenic) (0.040-in. stock). 



