This project is concerned with a survey of the notch-toughness properties and other characteristics of mild steel ship plate as procured by various commercial shipyards for new merchant ship construction under the American Bureau of Shipping Rules. The over-all objective is to determine the extent to which present-day ship plate steels have been improved, based principally upon a comparison of their Charpy V-notch properties with those established at the National Bureau of Standards on plates from fractured World War II ships. Samples of Classes A, B, and C plates are being furnished on a continuous basis by the U. S. Coast Guard and represent scrap material remaining from plates used in new ship construction. Information relative to the background history of the samples is meager. To date, 32 Class A, 80 Class B, and 16 Class C plate samples (total 128) have been received. On each sample, the Material Laboratory determined the chemical composition (C, Mn, Si, Al), ferrite and McQuaid-Ehn grain sizes, static tensile properties, notch-toughness properties as evaluated by Navy tear tests at selected temperatures, and Charpy V-notch and keyhole-notch transition temperatures. This progress report presents data obtained on 8 Class A, 44 Class B, and 8 Class C samples (total 60). On the basis of comparison of the 15 ft-lb Charpy V-notch transition temperatures with those established by the National Bureau of Standards, the preliminary findings indicate that the notch-toughness properties of ABS ship plate of current manufacturer are considerably better than those of plate made during World War II.

  • Corporate Authors:

    Naval Material Laboratory

    Naval Shipyard
    New York, NY  United States 

    Ship Structure Committee

    National Academy of Science, 2101 Constitution Avenue, NW
    Washington, DC  United States  20418
  • Authors:
    • Kahn, N A
    • Imbembo, E A
    • Gabriel, J J
  • Publication Date: 1955-6-10

Media Info

  • Features: References;
  • Pagination: 30 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00331301
  • Record Type: Publication
  • Source Agency: Ship Structure Committee
  • Report/Paper Numbers: SSC- 99
  • Files: TRIS
  • Created Date: May 21 1981 12:00AM