DIN Metallographic examination; microscopic examination of special steels using standard diagrams to assess the content of non-metallic inclusions. Buy DIN () Metallographic examination; microscopic examination of special steels using standard diagrams to assess the content of non-metallic. DIN Standard. The Non-Metallic Inclusion rating method as per DIN standards. K4 method is unique to the German standrd.
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The reproduction is intendecl tct show that loosely grorJped stt’ings are to bo assignecl lower rating numbors corresponding to the arer of oxides contained.
The values obtained in 506002 two cases should if possible be integers and for this reason rhould be rounded, if necessarY. This is represented by columns 0, 2 and 5, each on the left of a basic column, Similar considerations apply for the evaluation of thicker inclusions with twice the area.
K Range of rnting numberrt to kre rrssd ln the evaluation Fr. I if possible, 80mm in diameter; fields with a diameter between 75 and 80 mm are however permitted.
The principle of assignlng the rating number according to ths araa of the inclucions also applies for thlcker inclusions, the claseification of which by length has been mads in ascordanco with the basic series of For a classification of globular inclusions, insofar they are not represented in diagram plate No.
International standard lsoStoel; determination of content of non-metallic incluslons; micrographic method using standard diagrams tl has been issued by the International organization for standardization tisot. The relevant numbers indicate the amount by which the rating number assigned to the total length, is to be reduced because of the greater degree of fragmentation see subclause 7.
Over 60 nrm Wldth? Which of the two methods is to be used, shall be specified in the rplevant deliverv condition.
DIN ENGL – Free Download PDF
Both mncroscopic and microscopic methods are used for this purpose. It is not permittod to give fractions to indicate the inclusion rating e.
This figure can be used especially foisimple regding of 500602 values of inclusion longth and width. Rating number 9 is resen’ed for macroscopic inclusions, which are not shown in diagrammatic form, becauss they would extend bsyond the limits of the rin field.
Microscopic examination can be carried out using a metallurgical microscope and auto.
These numbers are then genorally in ranges which, for examplo in the case of mothod Krl’, srrt di recorded, but still ari’e to bo teken lntcl accoltnt for column of diagram plate No. The dellvery conditions rnay specify a ditferent number of specinnens. Relationship between true width, true length and sizc rating number for the inclusions referrod to in tables 2 and 3 congidered necessrtry to reprosent individual sulfidic inclusions.
It can therefore only give att approxirnatc indicatiott of tho oliginal plate. The length of an oxidic inclusion in the case of OA inclusions is greater than that for OS inclusions of the same width, because 5062 a given rating number, the aroa vrrould otherwise be dlfferent.
The speclmens shall be taken in ddin with the specifications dkn in subclauses 5’2 and 5. The factors obtained on the basis of the Zn-a goometlic series for tho other rating numbers are to be rounded so that, in the calculatlon, it is only necessaryr to double or halve the numbers. The two total indices or the ovirall total index reprss nt the degree of purity of the test unit examined. Diagram plates Nor;,2 and 3, which dij diagranl plate No. Such a magnification is equal to the scale on which diagram plate Nos,?
When using diagrant plates Nos. The associatod numbers show the amount bv which the rating number is to be increased, with increasing frequency. Th and therefore is to be measu V 7. Where only separate, predetermined measurement fields or parts of measurement field within the polished fin are to be cxamined which is only advisable in exceBtlonal casesthe size and distributlon of these fiefds or parts of measurement fields shall comply with the conditions for a statistical test, tlre derived columns of diagram plate No.
There is also provision for determining maximunr sizes.
DIN 50602 ENGL
This standard specifies a method to be applied using a metallurgical microscope 5060 a set of standard diagrams arranged in a systematic sequence, which enables the micrograph to be described on the basis of the type and size of inclusion length and width or diameter and the frequency standard diagram plate I whorr comparing them to the basic series shown irr ptate No. The relevant dih indicate the amount by which the rating number assigned to the total length, is to be reduced because of the greater degree of fragmentation see subclause 7,2.
Thls lowest rating number depends mainly on tho manufacturing process particularly the steelmaking processand on the intended application of the materisl concerned and the dimensions of the product. Converted to a polished section area ol mm2 and rounde to the nearest whole nulnbers. The associated numbers show the amount by which the rating numbor is to be increased, with increasing frequency.
With this nethcrd, the alea of the polished section of the specimc,n to be evaluatod strall be at least nrmz. Inclusions of equal area but differing in length x width or frequency, aro shown on the salne line next to the basic column for each type of inclusion. Cnnvortod to a polished section area of lnrrn2, Rounded fronr 1 ,Gg to 1,7. With this procedure, the larger inclusions are more accurately ovaluated, Table 6 gives the factors to be userJ in the calculations.