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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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