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    ASTM A694 F70 Flanges Manufactured to MSS SP 44

    Among all grades of the specification, ASTM A694 F70 has the highest yield strength(70 ksi). ASTM A694 F70 flanges refer to forged low alloy steel Gr.F70 flanges manufactured to MSS SP 44 covering both welding neck and blind flanges sized from NPS 12 to NPS 60 in pressure ratings of Class 150, Class 300, Class 400, Class 600 and Class 900. They are mainly used to connect with butt welding pipe fittings of ASTM A860 Grade WPHY70 or API 5L Gr.X70 line pipes in high-pressure oil&gas transmission services. Since ASTM A694 only designates a loose range of chemical composition and mechanical properties, particular specifications for each grade(F42, F46, F48, F50, F52, F56, F60, F65, F70) shall be specified respectively.

    ASTM A694 F70 Flange WN RF 300# 30" XS, MSS SP 44
    ASTM A694 F70 Weld Neck Flange RF 30" 300# XS, MSS SP 44.

    Chemical requirements for ASTM A694 F70 flanges

    Element
    Content, %
    Carbon (C)
    0.06~0.10
    Silicon (Si)
    0.20~0.40
    Manganese (Mn)
    1.10~1.40
    Phosphorous (P)
    ≤ 0.020
    Sulfur (S)
    ≤ 0.010
    Nickel (Ni)
    1.20~1.70
    Molybdenum (Mo)
    0.20~0.40
    Chromium (Cr)
    ≤ 0.30
    Copper (Cu)
    ≤ 0.25
    Vanadium (V)
    0.02~0.06
    Pcm
    ≤ 0.25
    C.E.
    ≤ 0.48
     *Pcm refers to the cooling cracks susceptible index number which is calculated as:
      C + Si/30 + (Mn+Cu+Cr)/20 + Ni/60 + Mo/15 + V10 + 5B
     *C.E refers to the carbon equivalent which can be calculated as:
      C + Mn/6 + (Cr+Mo+V)/5 + Cu+Ni)/15

    Mechanical properties for ASTM A694 F70 flanges

    Tensile Strength, 
    MPa, min.
    Yield Strength 
    MPa, min.
    Elongation 
    %, Min.
    Reduction of 
    Area %, min.
    Charpy @-46°C 
    J, min.
    Hardness 
    HB, min.
    600~770
    485
    18
    45
    60
    156~220
     *Heat treatment of quenching and tempering(Q + T) at 620°C  shall be conducted.

    Views: 7880  Author:METALS INDUSTRIAL  Date:2015/12/08