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    UT SEP 1921/84 standard

    This spec is applicable to forged and hot-rolled, raw or processed steel bars in alloyed or non-alloyed steels, in natural state or treated condition. The inspection method for the search of internal defects can be freely chosen by the supplier (instrumentation, 1-4 MHz probes, coupling methods, etc.) as long as the test is carried out on the entire number of pieces. Defect recording must be done according to the F.B.H. (flat-bottom-hole) method. All defects (indications) bigger than the agreed-upon values must be described according to their position, size, extension and have to be reproduced in a drawing. Such a condition has to be sent to the Lucefin Group’s Technical Department for evaluation.

     

     

     

     

     

     

     

     

    Acceptance limits

     

     

     

     

     

     

    Table 1

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

    Size Category

    Single defects

    Defects with extension

    Max. extension

    mm FBH  (1)

    FBH  mm 

    mm

    A

    14

    10

    80

    B

    10

    7

    60

    C

    7

    5

    40

    D

    5

    3

    30

    E

    3

    2

    30

    (1) The distance between single defects must be min. 50 mm; where the distance is lower, defects must be 

    considered with their extension.

     

     

     

     

     

    Number of defects on individual pieces

     

     

     

     

    Table 2

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

    Frequency Category

    Number of defects

    Number of defects with extension

    a

    32

    16

    b

    16

    8

    c

    8

    4

    d

    4

    2

    e

    2

    1

     

     
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