36 



Copper and Copper-base Alloys 



70 



60 



50 



40 



30 



20 



iO 



11.0 20.7 29.4 37.2 44.0 50.0 55.5 60.5 648 68.6 

 Percent Reduction of Area by Rolling 

 01 234 56789 10 

 B S' S Numbers Hard 



Chart 18. — The effect of cold rolling on the yield strengths of 

 commercial bronze (Government-gilding) strip, previously annealed 

 to a grain size of 0.070 mm. (89.74 % copper) (0.040-in. stock). 



CR 



400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg.F. (lHna+ Temp.) 



Chart 19. — The effect of annealing on the tensile strength and 

 apparent elastic limit of commercial bronze (Government-gilding) 

 strip, previously cold-rolled 6 B. & S. Nos. (50 per cent reduction of 

 area) from two different grain sizes, 0.015 and 0.070 mm. (89.74 % 

 copper) (0.040-in. stock). 



0.100 



ao6o 



0.040 



Q020 



900 1000 1100 1200 1300 1400 



Annealing Temp, in Deg.F: C I Hr. at Temp.) 



Chart 20. — The effect of annealing on the grain-growing charac- 

 teristics of commercial bronze (Government-gilding) strip, previously 

 cold-rolled 6 B. & S. Nos. (50 per cent reduction of area) from two 

 different grain sizes, 0.015 and 0.070 mm. (89.74 % copper) (0.040-in. 

 stock) . 



CR 400 500 600 700 800 900 1000 HOC 1200 1300 

 Annealing Temp, in Deg.F. (IHr: at Temp.) 



Chart 21.— The effect of annealing on the Rockwell hardness and 

 percentage elongation in 2 in. of commercial bronze (Government- 

 gilding) strip, previously cold-rolled 6 B. & S. Nos. (50 per cent 

 reduction of area) from two different grain sizes, 0.015 and 0.070 mm. 

 (89.74 % copper) (0.040-in. stock). 



