The Tin Brasses 



141 



ll.O 20.7 29.4 37.2 44.0 50.0 55.5 60.5 64.8 68.6 

 Percen+ Reduction of Area by Rolling 

 01 23456789 10 

 B 8i S Numbers Hard 



Chart 23. — The effect of cold rolling on the yield strengths of pen- 

 metal strip, previously annealed to a grain size of 0.015 mm. (83.32 % 

 copper, 1.32 % tin, balance zinc) (0.040-in. stock). 



90 



80 



70 



6-60 



fc50 



Q. 



^40 



o 



I 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 

 01 2 345 6789 10 

 B XS Numbers Hard 



Chart 24. — The effect of cold rolling on the yield strengths of pen- 

 metal strip, previously annealed to a grain size of 0.080 mm. (83.32 % 

 copper, 1.32 % tin, balance zinc) (0.040-in. stock). 



0.100 



0.080 



0.060 



0.040 



0.020 



0.000 



800 900 1000 1100 1200 1300 



Annealing Temp. in Deg.F(IHna+ Temp.) 



Chart 25. — The effect of annealing on the grain-growing character- 

 istics of pen-metal strip, previously cold-rolled 6 B. & S. Nos. (50 per 

 cent reduction of area) from two different grain sizes, 0.015 and 0.080 

 mm. (83.32 % copper, 1.32 % tin, balance zinc) (0.040-in. stock). 



100 



90 



80 



i70 

 a' 



"^60 

 a> 

 ^^50 



J3 



_1 



o40 



o 



o 



-30 

 20 

 10 



CR 400 500 600 700 800 900 1000 IIOO 1200 1300 

 Annealing Temp, in Deg. RClHr at Temp.) 



Chart 26. — The effect of annealing on the tensile strength and 

 apparent elastic limit of pen-metal strip, previously cold-roUed 6 B. & 

 S. Nos. (50 per cent reduction of area) from two different grain sizes, 

 0.015 and 0.080 mm. (83.32 % copper, 1.32 % tin, balance zinc) 

 (0.040-in. stock). 



