The Tin Brasses 



139 



CR 400 500 600 700 800 900 1000 1100 1200 1300 

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



Chart 17. — The effect of annealing on the Rockwell hardness and 

 percentage elongation in 2 in. of chain-bronze strip, previously cold- 

 rolled 6 B. & S. Nos. (50 per cent reduction of area) from two different 

 grain sizes, 0.015 and 0.080 mm. (87.58 % copper, 0.86 % tin, balance 

 zinc) (0.040-in. stock). 



400 500 600 700 800 900 1000 iiOO 1200 1300 

 Annealing Temp, in Deg.Ef 1 Hr. at Temp.) 



Chart 18. — The effect of annealing on the yield strength of chain- 

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

 of area) from a grain size of 0.015 mm. (87.58 % copper, 0.86 % tin, 

 balance zinc (0.040-in. stock). 



D-40 



30 



- 20 



no 



too 



CO 

 (U o 

 o o 

 1- — r 





_o^ 



Ul </) 



10 



400 500 600 700 800 900 1000 1100 1200 1300 

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



Chart 19. — The effect of annealing on the yield strength of chain- 

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

 tion of area) from a grain size of 0.080 mm. (87.58 % copper, 0.86 % tin, 

 balance zinc (0.040-in. stock). 



. cr 



f^" « 70 



60 



50 



40 



30 



20 



10 20 30 40 50 60 70 80 90 Xf^Q 

 Rockwell Hardness B ^i6"Boill 100 Kg.Locjid 



63 69 74 80 86 91 97 - 

 Rockwell Hardness F V\s"^a\\ 60 Kg. Load 



64 67 71 74 77 80 84 87 90 93 

 Rockwell Hardness I5T '/i6"Bc3ill 15 Kg. Load 



22 29 36 43 50 57 64 70 76 82 

 Rockwell Hardness 30T'/i6"Ball SOKg.Load 



Chart 20. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of chain-bronze strip 

 (87.58 % copper, 0.86 % tin, balance zinc) when only Rockwell hardness 

 is known. It is accurate for all thicknesses between 0.020 and 0.080 in. 

 within the given limits. 



57 



61 



15 



