Tensile tests
70.—(1)  The tensile strength of steel forgings shall not, except with permission of the Surveyor-General of Ships, exceed 40 tons per square inch; and the elongation, measured on the appropriate standard test-piece C, D or E, shall not be less than 17% for 40-ton steel; and in no case shall the sum of the tensile strength and the corresponding elongation be less than 57.
(2)  Ingot steel for shafting shall be generally of 28 to 32 tons per square inch standard quality, and when steel of other quality is used the case shall be submitted for consideration and approval of the Surveyor-General of Ships.