Tables 60-63. 



MECHANICAL PROPERTIES. 



TABLE 60. — Copper Wire — Medium Hard-drawn. 



(A. S. T. M. B2-1S) Minimum and Maximum Strengths. 



83 



Representative values only from table in specifications are shown above. 

 P-limit of medium hard-drawn copper averages 5° per cent of ultimate strength. 



TABLE 61. — Copper Wire — Soft or Annealed. 



(A. S. T. M. B3-15) Minimum Values. 



Note. — Experimental results show tensile strength of concentric-lay copper cable to approximate 90 per cent oS 

 Bombined strensths of wires forming the cable. 



TABLE 62. — Copper Plates. 



(A. S. T. M. B11-18) for Locomotive Fire Boxes. Specification Values. 



Note. 



CoppK to be fire-refined or electrolytic, hot-rolled from suitable cakes. 

 TABLE 63. — Copper Alloys. 



The general system of nomenclature employed has been to denominate all simple copper 

 zinc illoys as brasses, copper- tin alloys as bronzes, and three or more metals alloys composed 

 primi'.rily of either of these two combinations as alloy brasses or bronzes, e.g., "Zinc bronze" 

 for U. S. Government composition " G " Cu 88 per cent, Sn 10 per cent, Zn 2 per cent. Alloys 

 of the third type noted above, together with other alloys composed mainly of copper, have 

 been called copper alloys, with the alloying elements other than minor impurities listed 

 as modifying copper in the order of their relative percentages. 



In some instances, the scientific name used to denote an alloy is based upon the deoxidizer 

 used in its preparation, which may appear either as a minor element of its composition or 

 not at all, e.g., phosphor bronze. 



Commercial names are shown below the scientific names. Care should be taken to specify 

 the chemical composition of a commercial alloy, as the same name frequently applies to 

 widely varying compositions. 



Smithsonian Tables. 



