Accession Number : AD0459567


Title :   DEVELOPMENT OF A 7 1/2NI-CR-MO STEEL FOR SUBMARINE-HULL APPLICATIONS.


Descriptive Note : Final rept.,


Corporate Author : UNITED STATES STEEL CORP MONROEVILLE PA APPLIED RESEARCH LAB


Personal Author(s) : Alger, J V ; Brown, R M ; Manganello, S J ; Murphy, W J ; Porter, L F


Report Date : 28 Dec 1962


Pagination or Media Count : 20


Abstract : Extensive studies on Laboratory and production heats indicate that most of the requirements for an HY-150 steel can be met by a quenched and tempered 7 1/2Ni-Cr-Mo steel. Preliminary welding studies on the 7 1/2Ni-Cr-Mo steel indicated that the notch toughness of the heataffected zone was similar to that of the unaffected base metal, and that the heat-affected zone was susceptible to restraint cracking to about the same degree as that of HY-80 steel. Recently, the Bureau of Ships lowered the yieldstrength objective for the higher strength submarine-hull weldment form a minimum of 150,000 psi to the range 130,000 to 150,000 psi because prospects for the development of a matching filler metal are much better in the reduced yield-strength range. Laboratory studies are now in progress to develop an HY-130/150 weldment. Preliminary results indicate that the required properties can be obtained in a steel with a nickel content significantly lower than 7 1/2%. (Author)


Descriptors :   SUBMARINE HULLS , STEEL , HEAT TREATMENT , MELTING , ROLLING(METALLURGY) , MECHANICAL PROPERTIES , TEST METHODS , HARDNESS , WELDING , SELECTION , ACCEPTABILITY


Distribution Statement : APPROVED FOR PUBLIC RELEASE