Steel Alloy HY TUF

  • Steel Alloy HY TUF
  • General Characteristics

    HY-TUF VAC-ARC steel is a high strength low alloy steel. It is typically used in the 220/240 ksi (1517/1655 MPa) tensile strength range. At this strength level, the alloy has good ductility, fracture toughness and impact strength. It is vacuum arc remelted to provide optimum cleanliness and preferred ingot structure for superior mechanical properties. This alloy is most frequently used for aircraft landing gear, flap tracks and other structural applications.

  • Typical Chemical Composition

    Weight % C Mn Si Ni Cr Mo Fe
    Typical

    composition

    0.25 1.35 1.50 1.80 0.30 0.40 Remainder
  • Physical Properties

    Characteristics English Metric
    Nominal density

    (68°F/20°C)

    0.281 lbs/in3 7.77 g/cm3
    Coefficient of thermal

    expansion

    0°F – 200°F

    -18°C – 93°C

    6.30 micro in/in- °F 11.3 micro m/m- °K
    Thermal conductivity 21.7 BTU/ft- hr – °F 37.49 W/m – °K
  • Mechanical Properties

    Tensile Hardness
    Ultimate Yield Elongation at break Reduction

    of area

    Rockwell C –

    Jomini test –

    distance from

    quenched end

    Fracture toughness
    KSI MPa KSI MPa % % 1” 1/2” 1/8” Ksi ∙ in-0.5 MPa ∙ m-0.5
    Bar, Tube 220 1520 185.1 1276 5 30 45 47 47 min 100 min 110
  • Specifications

    • AMS – 6425
    • DMS – 1841 (McDonnell-Douglas)
    • Military standard – MIL-S-7108

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