238 



Copper and Copper-base Alloys 



400 800 1200 1600 2000 



Temperature in Deg.F (1 Hnat Temp.) 



Ch.\ht 36. — The effect of elevated temperature on the tensile 

 strength and percentage elongation in 2 in. of 80-20 cupro-nickel rod, 

 previously cold-drawn 20 per cent (reduction of area) from material 

 having a grain size of 0.035 mm. (79.99 % copper, 19.60 % nickel, 

 0.41 % iron and manganese). Based on data by G. D. Bengough'"'" 

 (rod under 1 in. in diameter). 



CD 700 800 900 1000 1100 1200 1300 1400 1500 1600 

 Annealing Temp, in Deg.Fi (iHr. at Temp.) 



CH.iET 38. — The effect of annealing on the Rockwell hardness, 

 percentage elongation in 2 in., and grain size of 80-20 cupro-nickel tube, 

 previously cold-drawn 60 per cent (reduction of area) from material 

 having a grain size of 0.050 mm. (78.18 % copper, 20.65 % nickel, 

 0.51 % manganese). 



CD 700 800 900 1000 1100 1200 1300 1400 15.00 1600 

 Annealing Temp.in Deg.f: fl Hr a+ Temp.) 



Ch.vrt 37. — The effect of annealing on the tensile strength and 

 apparent elastic limit of 80-20 cupro-nickel tube, previously cold- 

 drawn 60 per cent (reduction of area) from material having a grain 

 size of 0.050 mm. (78.18 % copper, 20.65 % nickel, 0.51 % manganese). 



130 

 120 



110 

 100 

 90 



60 



o 50 



30 







100 70 80 70 60 50 40 30 20 10 Cu7o 



10 20 30 40 50 60 70 80 90 100 Ni 7o 



Chart 39. — The tensile strength, fatigue, and corrosion fatigue 



(for both fresh and tidal waters) of alloys of copper and nickel. Based 



on data by H. J. Gough.'s) 



