The Tin Brasses 



137 



TABLE 2 

 CHAIN BRONZE 



General Data — Strip" 

 Copper, 87.58%; tin, 0.86%; lead, nil; zinc, balance 



Property 



Hard'- 



Soft'= 



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



Elongation, % in 2 in 



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, Jfe-in- ball, 60-kg. load 



Rockwell hardness B, H^-m. ball, 100-kg. load 



Rockwell hardness G, Ke-in- ball, 150-kg. load 



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



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



■» All tests conducted on 0.040-m. stock. 



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



• Annealed at 1400 °F. for 1 hr. 



20 



11.0 20.7 29.4 37.2 44.0 50.0 55.5 60.5 64.8 6a6 

 Percent Reduction of Area by Rolling 

 01 2345 6789 10 

 BSS Numbers Hard 



Chart 11. — The effect of cold rolling on the tensile strength and 

 apparent elastic limit of chain-bronze strip, previously annealed to 

 two different grain sizes, 0.015 and 0.080 ram. (87.58 % copper, 0.86 % 

 tin, b£ilance zinc) (0.040-in. stock). 



Olio 



CQ 



^100 



6 



^ 90 

 S 80 

 \ 70 



60 



^ 50 



5 30 

 = 20 



11.0 2Q7 29.4 372 44.0 5a0 555 60.5 64.8 68.6 

 Percerrf Reduc+ion of Area by Polling 

 01 23456789 10 

 ESS Numbers Hard 



Chaht 12. — The effect of cold rolling on the Rockwell hardness 

 and percentage elongation in 2 in. of chain-bronze strip, previously 

 annealed to two different grain sizes, 0.015 and 0.080 mm. (87.58 % 

 copper, 0.86% tin, balance zinc) (0.040-in. stock). 



