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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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