TEST AND EXPLORATORY DEVELOPMENT OF AN OPTIMUM ALUMINUM ALLOY SYSTEM FOR SHIP STRUCTURES

Evaluation of plate fabricated in the laboratory from a series of Al-Mg alloys having magnesium contents of 7.0 to 9.5% showed an alloy designated as CS19 met the contract requirement of an as-welded yield strength of 30 ksi minimum. Fracture toughness and resistance to general corrosion, to exfoliation and to initiation of stress-corrosion cracks were at least equivalent to present 5456-H116 or H117 alloys. MIG weldments of CS19 plate produced with CS19 electrode and by a practice which provides interpass cooling to 250F were highly resistant to stress-corrosion cracking even after thermal treatment at 212F to simulate metallurgical changes taking place during long periods of service. Nominal composition of CS19 is Al-8.25 Mg-0.4 Mn-0.1 Cr with 0.12 max. Fe and 0.10 max. Si. (Modified author abstract)

  • Corporate Authors:

    Aluminum Company of America

    Physical Metallurgy Division
    Alcoa Center, PA  USA 

    Naval Ship Systems Command

    Scientific Documentation Division
    Washington, DC  USA 
  • Authors:
    • Rogers, RWJ
    • Vernam, W D
    • Shumaker, M B
  • Publication Date: 1974-7-23

Media Info

  • Pagination: 78 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00084822
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: 56-AC223 Final Rpt.
  • Contract Numbers: N00024-72-C-5571
  • Files: TRIS
  • Created Date: May 19 1975 12:00AM