Grade 660 (A-286)

    Grade 660 (A-286)

    Grade 660 (A-286). High temperature bolting material, expansion coefficient comparable to Austenitic Stainless Steels.

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    Grade 660 Specification/Condition

    • ASTM A453 Gr 660 B+D/ ASTM A638 Gr 660 Type 2/ NACE MR0175 / UNS S66286

    Grade 660 Applications

    • bolting for piping and special purpose applications
    • boiler and pressure vessels

    Grade 660 Technical Data

    • UTS (KSI): Min 120 KSI
    • Yield 0.2% Offset (KSI): Min 95 KSI
    • EL (% Min): 15%
    • RA (% Min): 35%
    • Hardness (HRC): 24-35 HRC
    • Charpy Impact Min. ft-lbs: 20 @-100°C

    Grade 660 Stocking Dimensions

    • Bar: 0.5 – 6.5 in
    • Bored Bar with bespoke internal diameters via vSM’s in-house deep hole drilling and honing capabilities

     

    Grade 660 Chemical Composition (Wt %)

     

    Carbon
    (C)
    Manganese
    (Mn)
    Phosphorus
    (P)
    Sulfur
    (S)
    Silicon
    (Si)
    Nickel
    (Ni)
    Cobalt
    (Co)
    0.08 Max 2.0 Max 0.040 Max 0.030 Max 1.0 Max 24.0-27.0

     

    Chromium
    (Cr)
    Molybdenum
    (Mo)
    Niobium + Tantalum
    (Nb (Cb) + Ta)
    Titanium
    (Ti)
    Copper
    (Cu)
    Aluminum
    (Al)
    Iron (Fe) & Others
    13.5-16.0 1.0-1.5 1.9-2.35 0.35 Fe– Balance, V– 0.10-0.50,
    B– 0.001-0.010

     

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