The Leaded Brasses 



107 



TABLE 6 

 ENGRAVER'S BRASS 



General Data — Stbip" 

 Copper, 63.37%; lead, 1.53%; iron, 0.08%; zinc, balance 



Property 



Hard" 



Soff^ 



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% ofiset, p.s.i. (000 omitted) 



Yield strength, 0.1% offset, p.s.i. (000 omitted). 



Rockwell hardness F, He-in- ball, 60-kg. load . 



Rockwell hardness B, Ke-™- ball, 100-kg. load 



Rockwell hardness G, He-™- ball, 150-kg. load 



Rockwell hardness 15-T, Ke-in. ball, 15-kg. load 



Rockwell hardness 30-T, Me-in. 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, <"' % I.A.C.S., 68°F 



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



" All tests conducted on 0.040-in. stock. 



» 6 B. & S. Nos., hard, 0.080-0.015 mm. grain size at ready-to-finish. 



' 1200°F. anneal (1 hr. at temperature) of material described in footnote b. 



no 



100 

 90 

 80 



^ 60 



l_ 50 



-J 40 

 o 

 o 

 o^ 30 



20 



10 



11.0 20.7 29.4 37.2 44.0 50.0 55.5 60.5 64.8 68.6 

 Percent Reduction of Area by Rolling 

 012 345 6789 10 

 BSS Numbers Hard 

 Chart 53. — The effect of cold rolling on the tensile strength and 

 apparent elastic limit of engraver's brass strip, previously annealed to 

 two different grain sizes, 0.015 and 0.080 mm. (63.37 % copper, 1.53 % 

 lead, balance zinc) (0.040-in. stock). 



110 



■" 100 



"O 

 D 



S 90 

 S 80 



CO 60 

 \ 50 



(LI 



c 40 



I 30 



I 20 



I 10 







11.0 20.7 29.4 37.2 44.0 50.0 55.5 60.5 64.8 68.6 

 Percent Reduction of Area by Polling 

 0123456789 10 

 BS^S Numbers Hard 



Chart 54. — The effect of cold rolling on the Rockwell hardness and 

 percentage elongation in 2 in. of engraver's brass strip, previously 

 annealed to two different grain sizes, 0.015 and 0.080 mm. (63.37 % 

 copper, 1.53 % lead, balance zinc) (0.040-in. stock). 



