The Silicon Bronzes 



243 



CR 500 600 700 800 900 1000 1100 1200 1300 1400 

 Annealing Temp, in Deg.F.(l Hr. a+ Temp.) 



Chart 9. — The effect of annealing on the percentage elongation in 

 2 in. of Type A silicon-bronze strip, previously cold-rolled from 2 to 

 29 per cent (reduction of area) from a ready-to-finish grain size of 

 0.090 mm. (96.50 % copper, 3.00 % silicon, 0.50 % tin) (0.040-in. stock). 



70 80 70 100 110 120 



Rockwell F Hardness (60 Kg. Load) 



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

 mate tensile strength and percentage elongation of Type A silicon- 

 bronze strip (96.50 % copper, 3.00 % silicon, 0.50 % tin) when only 

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

 0.020 and 0.080 in. 



10 20 30 40 50 60 70 80 

 Percent Reduc+ion by Drawing 



Chart 11. — The effect of cold drawing and cold drawing plus relief 

 annealing on the tensile strength and apparent elastic limit of Type A 

 silicon-bronze rod, previously annealed to a grain size of 0.040 mm. 

 (96.30 % copper, 3.10 % silicon, 0.42 tin) (rod under 1 in. in diameter). 



70 



"c 60 



u 

 i- 50 



40 



70 



60 



-^ 50 



c 



D 



u 40 

 11 

 ■^ 30 



20 



10 



i_ 



^ 100 

 E 

 I 90 



« 80 



\ 70 

 o 

 i: 60 



50 



100 



10 20 30 40 50 60 70 80 90 

 Percent Reduction in- Drawing 

 CH.iRT 12. — The effect of cold drawing and cold drawing plus relief 

 annealing on the Rockwell hardness, percentage elongation in 2 in., 

 and percentage reduction of area of Type A silicon-bronze rod, previ- 

 ously annealed to a grain size of 0.040 mm. (96.30% copper, 3.10% 

 silicon, 0.42 % tin) (rod under 1 in. in diameter) . 



