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    Compilation of Chemical Compositions and Rupture Strengths of Super-Strength Alloys

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    This compilation was originally prepared for Subcommittee XII on Specifications for High-Temperature, Super-Strength Alloys, ASTM Committee A-10, to assist the subcommittee in its efforts to write specifications for high-temperature super-strength alloys. Since its original publication, the activities of the subcommittee have been broadened to include ferritic (martensitic) super-strength alloys, and alloys of this type have been included in this revision. The definition of “super-strength alloy” as approved by Subcommittee XII is as follows: “The super alloys are heat-resistant materials having superior strengths at high temperature. They generally may be divided into two classes: ferritic (martensitic) and austenitic (used in its broad sense to include such materials as Ni- and Co-base alloys). The distinguishing characteristic of these two classes is marked superiority of these alloys over the AISI 300 series alloys under the service conditions for which these alloys are intended. This superiority is exhibited at or above 800 F for the ferritic (martensitic) class, and at or above 1100 F for the austenitic class. These alloys generally contain Fe, Ni, Co, or Cr, singly or in combination as the basis of their composition, but they invariably contain one or more additions of elements such as Mo, W, Cb, Ti and Al for the express purpose of effecting strengthening. The strength properties of these alloys are generally dependent on special processing and/or heat treatment.” A task group of Subcommittee XII was charged with the responsibility of compiling “a list of all super-strength alloys known to, or used by, the various industries, giving chemical composition and available properties.” Therefore, this compilation includes all known alloys, not just production alloys. Alloys known to be no longer in commercial production, and experimented alloys, are so indicated. Because echanical properties mean little without the details of processing and heat treatment, only the 100- and 1000-hr rupture strengths have been given, and these only to give an indication of the relative high-temperature strengths of the various alloys. Since most of the alloys listed are of a proprietary nature, the probable patentee has been listed. In most cases, the patentee is also the alloy producer, although some alloys are not manufactured by the patentee and some alloys are manufactured by more than one producer. The data tabulated in this compilation have been gathered from all possible sources. The chemical compositions given for most of the current alloys are based on the mid-point of the specification range. For the alloys not currently produced, the composition given is usually that of a single heat. The compositions listed should be considered as approximate and are indicated in the table as nominal chemical compositions, per cent. In some instances composition ranges are given.

    Author Information:

    Simmons, Ward F.
    Battelle Memorial Institute,

    Metzger, M. C.
    Universal Cyclops Steel Corp.,

    Committee/Subcommittee: A10

    DOI: 10.1520/STP46411S