Accession Number : AD0459672


Title :   EFFECT OF COMPOSITION AND HEAT TREATMENT ON THE MECHANICAL PROPERTIES OF NI-CR-MO SUBMARINE-HULL STEELS - I.


Descriptive Note : Technical progress rept.,


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


Personal Author(s) : Manganello, S J ; Porter, L F


Report Date : 31 May 1963


Pagination or Media Count : 30


Abstract : Previous studies to develop a submarine-hull steel that would meet the U. S. Navy requirements for an HY-130/150 steel indicated that a 5 1/4Ni-Cr-Mo-V steel appeared promising except that the hardenability of this steel was too low for use as 4-in.-thick plates. Therefore, a preliminary study was initiated on 5Ni-Cr-Mo steels to establish the range of hardenabilities required to obtain the desired microstructure and mechanical properties in 1/2-in.-thick plates air-cooled to simulate the cooling at the center of a water-quenched plate about 6 inches thick. The results showed that tye yield strengths of 1/2-in.-thick air-cooled plates were significantly lower than those of 1/2-in.thick water-quenched plates when the hardenability index was about 15, but that the yield strengths of the air-cooled plates were only slightly lower than those of the water-quenched plates at hardenability indices of 29 and higher. However, even at the higher hardenability values, the notch toughness of the aircooled plates was significantly lower than that of the water-quenched plates. (Author)


Descriptors :   *SUBMARINE HULLS , STEEL , CHEMICAL ANALYSIS , HARDNESS , TOUGHNESS , QUENCHING , SHIP PLATES


Distribution Statement : APPROVED FOR PUBLIC RELEASE