The Brasses 



31 



1 1.0 20.7 29.4 37.4 44.0 50.0 55.5 60.5 64.8 68.6 

 Percent Reduction of Area by Rolling 

 1234567 89 10 

 B^/S Numbers Hard 



Chart 3. — The effect of cold rolling on the yield strengths of gilding- 

 metal strip, previously annealed to a grain size of 0.015 mm. (94.59 % 

 copper) (0.040-in. stock). 



60 



50 



;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 ot Area by Rolling 

 0123456789 10 

 BS-S Numbers Hard 



Chart 4. — The effect of cold rolling on the yield strengths of gilding- 

 metal strip, previously annealed to a grain size of 0.070 mm. (94.59 % 

 copper) (0.040-in. stock). 



0.120 



aioo 



0.080 



CR 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp. in Deg.F f 1 Hr. at Temp.) 



Chart 5. — The effect of annealing on the tensile strength and 

 apparent elastic limit of gilding metal, previously cold-rolled 6 B. & S. 

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

 0.015 and 0.070 ram. (94.59 % copper) (0.040-in. stock). 



- 0.060 



Q040 



0.020 



900 1000 1100 1200 1300 1400 



Annealing Temp. in Deg.F C IHn at Temp.) 



Chart 6. — The effect of annealing on the grain-growing character- 

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

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

 (94.59 % copper) (0.040-in. stock). 



