Accession Number:

AD0604869

Title:

FEASIBILITY OF DEVELOPING AN HY-180/210 WELDMENT.

Descriptive Note:

Quarterly progress rept. no. 4, 1 Apr-30 Jun 64,

Corporate Author:

UNITED STATES STEEL CORP MONROEVILLE PA

Report Date:

1964-07-01

Pagination or Media Count:

50.0

Abstract:

Through the development of improved processing practices on small ingots, the notch toughness of air-melted 12Ni-5Cr-3Mo maraging steel appears to be equivalent to that of vacuum-consumable-electrode remelted 12Ni-5Cr-3Mo steel. Thus, light-gage plates of the 12Ni-5Cr-3Mo steel should now meet the desired minimum strength-toughness objective 50 ft-lb at 180 ksi. However, the notch toughness of the 12Ni-5Cr-3Mo steel in plates over 2 inches thick is presently in the range to 40 ft-lb. Therefore, improvements in the chemical composition and melting practice of the 12Ni-5Cr-3Mo steel are being investigated. In addition, the potential of carbon-martensitic age-hardened steels, conventional quenched and tempered steels, and rapidly heat-treated quenched and tempered steel is still being evaluated. The crack susceptibility and toughness of the heat-affected zones of the various experimental HY-180210 steels are being evaluated concurrently with the development of the base metals. Modest improvements in the notch toughness of the 12Ni-5Cr-3Mo filler metals have been obtained, but HY-180210 weld metals having energy absorptions consistently over 30 ft-lb have not as yet been developed. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE