The Brasses 



39 



CD 400 500 600 700 800 900 1000 1100 1200 1300 1400 

 Annealing Temp, in Deg.F.( 1 Hr a+ Temp.) 



Chart 30. — The effect of annealing on the tensile strength, apparent 

 elastic limit, and grain size of commercial bronze (Government-gilding) 

 rod, previously cold-drawn 37 % (reduction of area) from material 

 having a grain size of 0.050 mm. (89.99 % copper) (rod under 1 in. in 

 diameter). 



CD 400 500 600 700 800 900 1000 1100 1200 13001400 

 Annealing Temp, in Deg.F. (lHra+ Tennp.) 



Chart 31. — The effect of annealing on the Rockwell hardness, 

 percentage elongation in 2 in., percentage reduction of area of com- 

 mercial bronze (Government-gilding) rod, previously cold-drawn 

 37 per cent (reduction of area) from material having a grain size of 

 0.050 mm. (89.99 % copper) (rod under 1 in. in diameter). 



70 



60 



50 



o 30 



20 



CD 



400 500 600 700 800 900 1,000 1100 1200 1300 

 Annealing Temp, in Deg.F.( lHra+ Tennp.) 



Chart 32. — The effect of annealing on the yield strength of com- 

 mercial bronze (Government-gilding) rod, previously cold-drawn 

 37 per cent (reduction of area) from material having a grain size of 

 0.050 mm. (89.99 % copper) (rod under 1 in. in diameter). 



35 



30 



£25 



^20 



QJ 5 



200 400 600 800 1000 1200 1400 1600 1800 

 Temp, in Deg.F. ( I H r. at Temp.) 



Chart 33. — The effect of elevated temperature on tensile strength, 

 reduction of area, and percentage elongation in 2 in. of commercial 

 bronze rod (89.99 % copper), previously annealed to a grain size of 

 0.030 mm. according to W. B. Price*" (rod under 1 in. in diameter). 



