A new electroslag welding material was developed for heavy section pressure vessels of 2 1/4 Cr-1 Mo steels. It has enough strength and toughness after a long stress relief heat treatment and is followed by quenching. It was achieved by increase of manganese content, more than ordinary content, and a small addition of vanadium. The quality of weld metal was kept even at a slow quenching rate of 9 degrees C/min (16 degrees F/min) and also at variation in penetration in base metals during welding. Thermal embrittlement of weld metals during operation at about 450 degrees C (850 degrees F) was studied by means of an accelerated embrittling technique (G.E. Step Cooling treatments). There was an optimum content of manganese to reduce the embrittlement. Copper content had a detrimental effect and was kept below 0.10 percent in weld metals. It was important to make cooling after stress relief heat treatment as fast as possible for the prevention of thermal embrittlement since loss of the toughness due to slow cooling still remained after step cooling treatments. A linear relation between tensile strength at room temperature and at 435 degrees C (815 degrees F) was confirmed and an experimental formula was proposed for the estimation of tensile strength of electroslag weld metals with their chemical compositions.

  • Corporate Authors:

    Nippon Steel Corporation

    Products Research and Development Labs, 2-6-3 Otemochi, Chiyoda-Ku
    Tokyo 100,   Japan 
  • Authors:
    • Okumura, M
    • Kumagai, Masatoshi
    • Nakamura, H
    • Kohira, K
  • Publication Date: 1976-2

Media Info

  • Features: References;
  • Pagination: 28 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00149628
  • Record Type: Publication
  • Source Agency: Nippon Steel Corporation
  • Files: TRIS
  • Created Date: Apr 13 1977 12:00AM