Accession Number : AD0459940

Title :   WELDING CHARACTERISTICS OF FOUR PROMISING 130 TO 150 KSI YIELD-STRENGTH SUBMARINE-HULL STEELS I.

Descriptive Note : Progress rept.,

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

Personal Author(s) : Rathbone, A. M.

Report Date : 31 MAY 1963

Pagination or Media Count : 37

Abstract : As part of the program to develop submarine-hull weldments with yield strengths in the range 130,000 to 150,000 psi, the Applied Research Laboratory investigated the crack susceptibility, toughness, and transformation characteristics of the weld-heat-affected zones of four steels that appeared promising as HY-130/150 base metals. The present report summarizes the results of the latter two studies on HY-80, 3 3/4Ni-Cr-Mo-V, 5 1/4Ni-Cr-Mo-V, and 7 1/2Ni-Cr-Mo steels that were melted, rolled, and heat-treated on commercial facilities to an average yield strength of 145,000 psi. Results of Charpy V-notch tests showed that the greatest loss in shear-energy absorption occurred when heat-affected-zone microstructures were simulated using intermediate peak temperatures in the range 1600 to 2000 F, and the extent of the embrittlement was proportional to the nickel content. Results indicated that the nickel content of this type of Ni-Cr-Mo steel should be maintained at an intermediate level to minimize heat-affected-zone embrittlement at intermediate peak temperatures but at a level high enough to provide sufficient hardenability to minimize the formation of bainite when relatively high pre-heat and interpass temperatures are employed. (Author)

Descriptors :   (*WELDING, STEEL), (*STEEL, SUBMARINE HULLS), MECHANICAL PROPERTIES, MICROSTRUCTURE, TEMPERATURE, HARDNESS, HEAT TREATMENT, COOLING, NICKEL, TOUGHNESS, DETERMINATION, TRANSFORMATIONS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE