298 



Copper and Copper-base Alloys 



TABLE 4 

 TIN BRASSES 



° Composition of alloy and previous history not available. 



fr Yield strength 0.10% offset; impact — standard Izod specimens, all fractured. Specimens machined to 0.25 in. diameter from l-in.-diameter commercial rod. 



*= Yield strength — drop of beam method; test specimens machined to diameter of 0.504 in. from l-in.-diameter commercial rod. 



<* Tensile tests performed at room temperatures on specimens 0.7 in. in diameter. Impact tests at Battelle Institute in 1936 for American Brass Company. 

 Tests made on annealed specimens. Standard Charpy specimens (keyhole) (notch) cut from 0.750-in.-diameter rods. 120-ft.-lb. Amsler machine used. Specimens 

 in standard time of 5 sec. after removal from bath at stated temperatures. Specimens at — 115°C. ( — 175°F.) 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 fractured. 



" Same as footnote d, except that all Charpy specimens were unfractured. 



