Tensile tests
75.—(1)  The tensile strength may range from 26 to 40 tons per square inch, with an elongation, measured on the standard test-piece C, D, or E, of not less than 15%.
(2)  If, however, the castings are to be used for the more important parts of the hull, machinery, boilers and their appurtenances, and fittings, or for articles usually made of wrought material, the elongation shall not be less than 20% where the corresponding tensile strength is between 26 and 35 tons per square inch.
(3)  The material of cast steel webs for crank shafts shall be such that the tensile strength does not exceed 32 tons per square inch, and the sum of the tensile strength in tons per square inch and the percentage of elongation measured on the standard test‑piece C, D or E shall not be less than 50.