Accession Number : AD0616928

Title :   STUDIES OF CARBON-CONTAINING MARTENSITIC STEELS FOR AN HY-180/210 WELDMENT.

Descriptive Note : Technical rept.,

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

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

Report Date : 01 MAR 1965

Pagination or Media Count : 42

Abstract : Studies were made on 3 to 9 percent nickel quenched and tempered steels to investigate the effects of variation in carbon content, strengthening through the addition of cobalt, and secondary hardening through the addition of vanadium, tantalum, columbium, tungsten, titanium, and aluminum. The results show that the steels must be tempered at low temperatures (about 400 F) to meet the yield-strength requirement unless supplementary strengthening mechanisms are employed or the carbon content is increased above 0.25 percent. When the steels were strengthened by the addition of cobalt or secondaryhardening or age-hardening elements, the desired strength was obtained at a carbon content of 0.20 percent and at tempering temperatures as high as 1000 F. On a strengthtoughness basis, the most attractive strengthening agents were cobalt, vanadium, tantalum, and aluminum. At a yield strength in the range 180 to 185 ksi, the most promising carbon-containing martensitic steels absorbed 39 to 44 ft-lb at 0 F. However, an 0.07C-9Ni-4Co-1Mo0.3A1 steel exhibited exceptional notch toughness (140 ft-lb at 0 F) at a yield strength of 162 ksi. (Author)

Descriptors :   (*STEEL, WELDS), (*WELDS, STEEL), MARTENSITE, CARBON ALLOYS, COBALT ALLOYS, VANADIUM ALLOYS, TANTALUM ALLOYS, NIOBIUM ALLOYS, TUNGSTEN ALLOYS, TITANIUM ALLOYS, ALUMINUM ALLOYS, HEAT TREATMENT, HARDENING, TOUGHNESS, SHOCK RESISTANCE, NICKEL ALLOYS

Distribution Statement : APPROVED FOR PUBLIC RELEASE