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Centerway steel co., ltd
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  • ASTM A178

    ASTM A178 is a standard specification for electric-resistance-welded (ERW) tubes made from carbon steel and carbon-manganese steel. These tubes are primarily used in boilers, superheaters, and heat exchangers, where they must withstand high temperatures and pressures. The specification outlines the requirements for manufacturing, chemical composition, mechanical properties, and testing, ensuring the tubes perform effectively in demanding applications.

    Usage：Used in boiler, superheater, heat-exchanger and pressure equipment in Petrochemical factory, Refinery factory, sugar mill, power plant, power plant, shipbuilding.

    Outside diameter and Wall Thickness Tolerance of ASTM A178 welded boiler tube

    Outside Diameter tol

    Wall thickness tol

    OD < 50

    ±0.05mm

    S < 4mm

    ±12.5%

    OD > 50

    ±1%

    4--20mm

    +15/-12.5%

    S≧20mm

    ±12.5%

    Chemical Composition of ASTM A178

    Element %

    ASTM A178 Gr A / SA178A

    ASTM A178 Gr C / SA178C

    ASTM A178 Gr D / SA178D

    Low carbon steel

    Medium Carbon Steel

    Manganess Steel

    C

    0.06-0.18

    0.35 Max

    0.27 Max

    Mn

    0.27-0.63

    0.80 Max

    1.00-1.50

    P

    0.035

    0.035

    0.030

    S

    0.035

    0.035

    0.015

    Si

    ...

    ...

    0.10 Min.

    Mechanical Property

    Item

    ASTM A178 Gr A / SA178A

    ASTM A178 Gr C / SA178C

    ASTM A178 Gr D / SA178D

    Tensile strength, min, ksi [MPa]

    47[325]

    60[415]

    70[485]

    Yield strength, min, ksi [MPa]

    26[180]

    37[255]

    40[275]

    Elongation in 2 in. or 50mm, min, %

    35

    30

    30

    For longitudinal strip tests a deduction for

    1.50A

    1.50A

    1.50A

    Each1⁄32-in[0.8mm] decrease in wall thickness below 5⁄16in. [8mm]

     

     

     

    From the basic minimum elongation of the following percentage points shall be made

     

     


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