302 



Copper and Copper-base Alloys 



TABLE 9 

 SILICON BRONZES 



" Alloy composition and previous history not available. 



'■ Tests made in 1932 at the National Bureau of Standards for the American Brass Company. Amsler machine used. Speed of loading about 20,000 p.s.i. per 

 minute. Room temperature tests made on 0.5-in. -diameter specimens, all other temperatures on specimens machined to 0.25 in. in diameter. 



<= Impact tests made by Battelle Institute in 1936 for American Brass Company. Standard Charpy specimens (keyhole) (notch) cut from 0.750-in.-diameter 

 rod. 120-ft.-lb. Amsler machine used. Specimens tested in standard tim,e of 5 sec. after removal from bath at stated temperature. Specimens at — 115°C. were 

 frozen in ether with liquid air and allowed to heat to testing temperature. All others in bath 15 min. at testing temperature. Figures are average of three tests. 

 All Charpy specimens were unfractured. 



TABLE 10 

 BERYLLIUM COPPERS 



" Yield strength 0.10% offset; all tensile tests on specimens 0.25 i 

 mens, specimens marked * fractured, all others unfractured. 



in diameter, machined from 1-in. -diameter commercial rod; impact — standard Izod speci- 



