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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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