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          1. 中文版 English
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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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