The Brasses 



59 



TABLE 6 (Continued) 

 Available Creep Data<2> 

 Previous history: hot-rolled to 0.875 in. diameter, cold-drawn to 0.750 in. diameter. 



» Refers to rod under 1 in. in diameter and rod cold-drawn 60 % with a ready-to-finish grain s 



» Refers to a 1100°F. anneal (1 hr.) 



' Material cold-forged from soft rod (5-40 % reduction of area). 



<■ Material cold-forged from cold-worked condition (40%). 



• 6 B. & S. Nos., hard, 0.070-0.015 grain size at ready-to-finish, respectively. 

 ' Refers to 1100°r. anneal (1 hr. at temperature). 



Apply to strip only (aU tests conducted on 0.040-in. stock) . 



* Extruded, reduced, and cold-drawn to % by 0.049 in. 

 •■ 1000°F. anneal for 1 hr. 



11.0 20.7 29.4 372 44.0 50.0 55.5 60.5 64.8 

 Percent Reduction of Area by Rolling 

 12345 6789 

 BKS Numbers Hard 



58.6 

 10 11 



Chart 92. — The effect of cold rolling on the tensile strength and 

 apparent elastic Hmit of 70-30 (cartridge brass) strip, previously 

 annealed to two different grain sizes, 0.015 and 0.070 mm. (69.83 % 

 copper) (0.040-in. stock). 



"^100 



90 



70 



60 



50 



c 40 



X 30 



^ 20 



u 

 ° 10 







11.0 20.7 29.4 372 44.0 50.0 55.5 60.5 648 68.6 

 Percent Reduction of Area by Rolling 

 0123456789 ro 

 BKS Numbers Hard 



Chakt 93. — The effect of cold rolling on the Rockwell hardness and 

 percentage elongation in 2 in. of 70-30 (cartridge brass) strip, previously 

 annealed to two different grain sizes, 0.015 and 0.070 mm. (69.83 % 

 copper) (0.040-in. stock). 



