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Centerway steel co., ltd
a252 pipe,ssaw pipe china,piling steel pipe

  • JIS G3457

    JIS G3457--Arc welded carbon steel pipes.

    This Japanese Industrial Standard specifies the arc welded carbon steel pipes (hereafter referred to as“pipes”) used for piping for steam, water, gas, air, etc. of comparatively low working pressure.

    Elongation of pipes with a wall thickness under 8mm，tested using testpiece No.5(perpendicular to pipe axis direction) 

                                                                                                                                                                               Unit:%

    Wall thickness

    Over 5mm up to and 

    incl.6mm

    Over 6mm up to and 

    incl.7mm

    Over 6mm up to and 

    incl.7mm

    Elongation

    15min

    16min

    18min

    Tolerances on outside diameter and wall thickness

                                                                                                Unit:%

    Item

    Tolerance

    Tolerance on outside diameter

    ±0.5

    Tolerance on wall thickness

    Nominal dimameter 450A or under

    +15

    -12.5

    Nominal diameter over 450A

    +15

    -10

    Notes a）In this case,either the actually measured value of circumfential length or outside diameter and the 

    circumferential length or outside diameter obtained by conversion thereof shall be used.

    The mutual conversion of the outside diametre and the circumferential length shall be made by the following 

    equation.

    D=l/π

    Where，D:outside diameter（mm）l：circumferential length（mm）

           π：3.1416

               b）For the local parts such as repaired parts，the outside diameter tolerances in this table shall not apply.

     

     

     

     

     

     

     

     

     

     

     

    Chemical composition

    Symbol of grade

    C

    P

    S

    STPY400

    0.25max

    0.040max

    0.040max

    Mechanical properties

    Symbol of 

    grade

    Base metal

    Tensile

     strength 

    of weld

     

     

     

     

     

    N/mm²

    Tensile strength

     

     

     

     

    N/mm²

    Yield point or proof stress

     

     

     

     

    N/mm²

    Elongation%

    Tensile test 

    piece

    Tensile test direction

    Test piece 

    No.5

    Perpendicular to pipe axis 

    direction a）

    STPY 400

    400min

    225min

    18min

    400min

    NOTE：1N/mm²=1MPA

    Note：a）A test piece,when taken from the steel strip or steel plate,shall be either in

     parallel to or perpendicular to the rolling direction.

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