STP1522: Promoted Ignition-Combustion behavior of Cobalt and Nickel Alloys in Oxygen-Enriched Atmospheres

    Million, Joseph F.
    Development Associate, Materials Engineering R&D, Praxair, Inc., Tonawanda, NY

    Samant, Anand V.
    Manager, Materials Engineering R&D, Praxair, Inc., Tonawanda, NY

    Zawierucha, Robert
    Independent Consultant, East Aurora, NY

    Pages: 11    Published: Jan 2009


    Abstract

    Promoted ignition-combustion behavior has been used to describe a situation in which a substance with low oxygen compatibility ignites and supports the combustion of a more combustion-resistant material. Previous work has been reported on the investigation of this phenomenon as it relates to carbon steel, stainless steels, and a number of significant engineering alloys in the nickel, cobalt, and copper families. Reported in this paper are the results of promoted ignition-combustion tests of three cobalt based alloys in oxygen-enriched atmospheres at pressures ranging from 2.86 to 34.5 MPa. Included in the test program were Stellite 6, a commonly used hard facing alloy and two high strength cobalt alloys—MP35N and Elgiloy. Also reported in this paper are the results of promoted ignition-combustion tests of four nickel based alloys in oxygen-enriched atmospheres at pressures up to 34.5 MPa. Nickel alloys evaluated in the program included Hastelloys B-3 and W, RA 330, and a cast variant of the Hastelloy C type, CW6M. Hastelloy B-3 and CW6M are used in chemical process industry applications where corrosion is of concern. RA 330 is a significant elevated temperature alloy. Hastelloy W is a filler metal used for dissimilar metal welds.

    Keywords:

    metals, flammability, promoted ignition-combustion, PICT behavior, Stellite 6, MP35N, Elgiloy, Hastelloy B-3, Hastelloy W, RA 330, CW6M


    Paper ID: STP48821S

    Committee/Subcommittee: G04.01

    DOI: 10.1520/STP48821S


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