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38 ECONOMICS OF BRIDGEWORK Chapter V

 

cate in outline the final investigation it will be necessary to make, in order to establish the suitability of molybdenum steel for bridgework, determine the best proportions for the alloying elements, and demonstrate the economics of the alloy in comparison with other bridge steels, both plain and alloyed.

From "Molybdenum Commercial Steels" and the before-mentioned supplementary data furnished to the author the following tables have been copied or prepared:

Heat-Treated Chrome Steel with and without Molybdenum
TABLE 5a
Tensile Test on Chrome Steel
Analysis
CarbonManganeseChromiumMolybdenum
0.270.63 0.99None
 
Physical Properties. (1 inch round)
Elastic
Limit		Tensile
Strength		Elongation
Per Cent		Red. of Area
Per Cent
130,000139,000 16.558
 
TABLE 5b
Tensile Test on Chromol Steel
Analysis
CarbonManganeseChromiumMolybdenum
0.260.64 0.760.31
 
Physical Properties. (1 inch round)
Elastic
Limit		Tensile
Strength		Elongation
Per Cent		Red. of Area
Per Cent
142,000151,000 18.562

 

 
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