The Brasses 



55 



90 

 80 

 70 

 cr6a 

 ii50 

 ^40 

 §30 



Q. 



20 

 10 

 



2 3 4 5 6 7 

 BSS Numbers Hard 



3 4 5 6 7 

 iSS Numbers Hard 



Chart 80. — The effect of cold rolling on the yield strengths of spring- Chart 81. — The effect of cold rolling on the yield strengths of spring 



brass strip, previously Sjinealed to a grain size of 0.015 mm. (74.69 % brass, previously annealed to a grain size of 0.095 mm. (74.69 % 

 copper) (0.040-in. stock). copper) (0.040-in. stock). 



&00 



1400 



900 1000 1100 1200 1300 



Annealing Temp, in Deg.F. (1 Hr. at Temp.) 



Chart 82. — The effect of annealing on the grain-growing charac- 

 teristics of spring-brass strip, previously cold-rolled 6 B. & S. Nos. 

 (50 per cent reduction of area) from two different grain sizes, 0.015 

 and 0.095 mm. (74.69 % copper) (0.040-in. stock). 



110 



100 



90 



80 



^70 



^60 



S.50 



-'40 

 o 

 o 

 S 30 



20 

 10 



Room 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp.in Deg.R ClHr. at Terrip.) 



Chart 83. — The effect of annealing on the tensile strength and 

 apparent elastic limit of spring-brass strip, previously cold-rolled 

 6 B. & S. Nos. (50 per cent reduction of area) from two different grain 

 sizes, 0.015 mm. and 0.095 mm. (74.69 % copper) (0.040-in. stock). 



