ASTM WK46621

    Revision of F468M - 06(2012) Standard Specification for Nonferrous Bolts, Hex Cap Screws, and Studs for General Use (Metric)

    (What is a Work Item?)

    Active Standard: F468M - 06(2012)

    Developed by Subcommittee: F16.04 | Committee F16 | Contact Staff Manager



    WK46621

    1. Rationale

    ASTM F468M Subject: The addition of C-86 Nickel alloy on the identical property line as 686 Nickel alloy. Background: Nickel alloys C-86 and 686 have the same basic chemistry but differ in the manufacturing practices with the concern for the development of mu phase during processing of the material. Currently for Navy applications, each lot of 686 alloy is carefully reviewed before going into fastener production. The material alloy numbers provided in ASTM F467/468 as presented do not differentiate between the manufacturing processes. Little is known on the long term stability of this material over decades of in-service use for a manufactured part. Discussion: Designs used in US Naval service may be installed with little or no inspection over long periods of time, especially if service/inspection requires dry-docking. One of the primary environments for a nickel based alloy fastener is in seawater service. Table 2 of ASTM F467 and Table 2 of ASTM F468 utilize the identical material property marking without regard to the manufacturing process. This material has a tendency to migrate to the mu phase form during fabrication. Currently, there is no long term data available to show that one manufacturing process or the other results in a more stable material condition in various end-use environments over a long term (decades). Based on this, it is preferable to ensure that any fasteners produced include the alloy (C-86 or 686) and grade so as to be able to segregate the materials in their end-use location until such time that long term data becomes available. Utilizing the mechanical property marking method will not segregate the products. Having the alloy (C-86 or 686) distinctively marked with help with identification of failures and potential to identify the alloy should this become a determining factor for long term use in various environments in the future. It is therefore requested that the alloy process be identified in the part supplied by specifying the alloy (C-86 or 686) along with the material grade in the ordering and packaging information for this material. ASTM F468M, sections 3.1.4 and 16.3.2


    Keywords

    bolts; cap screws; general use; nonferrous; studs ; Aluminum alloys--specifications; Copper; Copper alloy--specifications; Fasteners (metal)--specifications; Naval brass; Nickel alloy bolting materials--specifications; Nickel-copper alloy--specifications; Nickel-copper-aluminum alloys; Nickel-molybdenum alloys--specifications; Nickel-molybdenum-chromium alloys--specifications; Nonferrous bolting materials; Palladium (titanium plus palladium)--specifications; Titanium plus palladium--specifications; Titanium (Ti)/alloys--specifications; UNS N04400 (Ni-Cu alloy, Monel 400); UNS N04405 (Ni-Cu alloy solution strengthened (Monel R405)); UNS N05500 (Ni-Cu alloy, Monel K500); UNS N10001 (Ni-Mo alloy, Hastelloy B); UNS N10002 (Ni-Mo alloy, Hastelloy C); UNS N10665 (Ni-Mo alloy, Hastelloy B-2); UNS R50250 (Ti, unalloyed); UNS R50400 (Ti, unalloyed); UNS R50550 (Ti, unalloyed); UNS R50700 (Ti, unalloyed); Yellow brass;
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    Work Item Status

    Date Initiated:
    07-01-2014

    Technical Contact:
    Ed Hibner

    Item:
    005

    Ballot:
    F16.04 (15-01)

    Status:
    Negative Votes Need Resolution

    Item:
    011

    Ballot:
    F16 (15-03)

    Status:
    Negative Votes Need Resolution