IMPROVED NOTCH TOUGHNESS OF EXPERIMENTAL SEMIKILLED STEELS OVER ONE INCH IN THICKNESS

A substitute for ABS Class C killed ship plate steel (over one inch thick) is desirable because it is likely that during an emergency hot-topping capacity would not be available for the production of ship plate. To provide a semikilled steel of suitable toughness, a cooperative investigation was undertaken to produce and test two 25-ton basic open-hearth semikilled heats containing lower carbon and higher manganese than present ship plate steels. Tests on the plate product indicate that this steel is tougher than presently used semikilled grades and should be sufficiently tough to consider as an emergency substitute, or possibly as an alternate, for ABS Class C steel in thicknesses over 1 in. to 1-3/4 in. inclusive. To meet the tensile properties specified by the American Bureau of Shipping for hull steel, it is tentatively recommended that the composition range for the proposed steel be 0.20% carbon maximum and 1.00 to 1.35% manganese. The proposed steel should have about the same sensitivity to underbead cracking as ABS Class C steel. It is recommended that a number of full-size heats be made and tested so that average properties and the likely range of properties may be better determined and optimum deoxidation practices established.

  • Corporate Authors:

    United States Steel Corporation

    125 Jamison Lane
    Monroeville, PA  United States  15146

    Ship Structure Committee

    National Academy of Science, 2101 Constitution Avenue, NW
    Washington, DC  United States  20418
  • Authors:
    • Vanderbeck, R W
  • Publication Date: 1956-8-1

Media Info

  • Features: References;
  • Pagination: 53 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00331712
  • Record Type: Publication
  • Source Agency: Ship Structure Committee
  • Report/Paper Numbers: SSC-101 Prog Rpt.
  • Contract Numbers: NObs-72046
  • Files: TRIS
  • Created Date: May 21 1981 12:00AM