The Tin Bronzes 



267 



110 

 100 

 90 

 80 

 70 

 ■ 60 

 50 

 40 

 30 

 20 



11.0 20.7 29.4 3Z2 44.0 50.0 555 60.5 64.8 68.6 

 Percen+ Reduction of Area by Rolling 

 123456789 10 

 B&S Numbers Hard 



Chakt 1. — The effect of cold rolling on the tensile strength and 

 apparent elastic limit of Grade A phosphor-bronze strip, previously 

 annealed to two different grain sizes, 0.015 and 0.070 mm. (4.09 % 

 tin, 0.035% phosphorus, balance copper) (0.040-in. stock). 



11.0 2Q7 29.4 37.2 44.0 50.0 55.0 6Q5 64.8 68.6 

 Percent Reduction of Area by Polling 

 01 2345 6789 10 



B S' S Numbers Hard 



Chart 2. — The effect of cold rolling on the Rockwell hardness and 

 percentage elongation in 2 in. of Grade A phosphor-bronze strip, 

 previously annealed to two different grain sizes, 0.015 and 0.070 mm. 

 (4.09 % tin, 0.035 % phosphorus, balance copper) (0.040-in. stock). 



100 



90 



80 



70 



^60 

 cr 



\- 50 

 <u 



D. 



.Q 40 



_I 



§ 30 

 o 



~ 20 

 10 



11.0 20.7 294 372 44.0 50.0 555 60.5 64.8 68.6 

 Percen+ Reduction of Area by Rolling 

 01 2345 6789 10 

 BS-S Numbers Hard 



Chabt 3. — The effect of cold rolling on the yield strengths of Grade 

 A phosphor-bronze strip, previously annealed to a grain size of 0.015 

 mm. (4.09 % tin, 0.035 % phosphorus, balance copper) (0.040-in. stock). 



90 



80 

 70 



^ 50 



D. 



540 

 o 

 S 30 



20 



1 1.0 20.7 294 37.2 44.0 50.0 555 605 64.8 68.6 

 Percent Reduction of Area by Rolling 

 01. 2 345 6789 10 

 BS-S Numbers Hard 



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

 A phosphor-bronze strip, previously annealed to a grain size of 0.070 

 mm. (4.09 % tin, 0.035 % phosphorus, balance copper) (0.040-in. stock). 



