The Tin Bronzes 



269 



80 

 70 

 60 



B 50 



& 

 '^ 40 



6) 



'^ 30 

 o 20 



CR 400 500 600 700 800 900 1000 1100 1200 1300 



Annealing Temp, in Deg.FCl Hn at Temp.) 



Chart 9. — The effect of annealing on the yield strength of Grade A 



phosphor-bronze strip, previously cold-rolled 6 B. & S. Nos. (50 per 



cent reduction of area) from a grain size of 0.070 mm. (4.09 % tin, 



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



100 

 t 90 



w 80 



u 

 <u 



O- 70 

 Si 



o 60 



o 



o 



-: 50 



SI 



cp 40 



<u 



-t 30 

 1/) 



^ 20 



J 10 







10 20 30 40 50 60 70 80 90 100 



Rockwell Hardness B ^le" Ball 100 Kg. Load 



63 69 74 80 86 91 97 - - - 

 Rockwell Hardness F yie" Ball 60 Kg. Load 



64 67 71 74 77 80 84 87 90 93 

 Rockwell Hardness 15 T '/i6"Ball 15 Kg. Load 



22 29 36 43 50 57 64 70 76 82 

 Rockwell Hardness 301 yi6"Ball 30 Kg. Load 

 Chart 10. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of Grade A phosphor- 

 bronze strip (4.09 % tin, 0.035 % phosphorus, balance copper) when 

 only Rockwell hardness is known. It is accurate for all thicknesses 

 between 0.020 and 0.080 in. within the given limits. 



100 

 90 

 80 



. 70 

 60 



' 50 

 40 



" 30 



, 20 



0.002 0.004 0.006 

 Strain, Inches per In. 



0.008 



Chart 11. — The effect of cold rolling on the stress-strain charac- 

 teristics of 5 per cent Grade A phosphor bronze (0.040 in. thick) 

 having a ready-to-finish grain size of 0.015 mm.; 5,000-lb. capacity 

 hydraulic testing machine and Templin automatic extensometer 

 accurate to 0.00001 in. used (4.09 % tin, 0.035 % phosphorus, balance 

 copper) . 



0.002 0.004 0.006 

 Strain, Inches per In. 



0.008 



Chart 12. — The effect of cold rolling on the stress-strain charac- 

 teristics of 5 per cent Grade A phosphor bronze (0.040 in. thick) 

 having a ready-to-finish grain size of 0.070 mm.; 5,000-lb. capacity 

 hydraulic testing mach'.ne and Templin automatic extensometer 

 accurate to 0.00001 in. \ised. (4.09 % tin, 0.035 % phosphorus, balance 

 copper). 



