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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There is also provision for determining maximunr sizes. Such a magnification is equal to the scale on which diagram plate Nos,? The width of the inclusion is to be assessed in accordance with diagram plate No. This figura can be used especially for simplo reading of interpolated values of inclusion length and Diagram plate No. The length of an oxidic inclusion in the case of OA inclusions is greater than that for OS inclusions of the same width, because for a given rating number, the aroa vrrould otherwise be dlfferent.
It is not permittod to give fractions to indicate the inclusion rating e. This figure can be used especially foisimple regding of interpolated values of inclusion longth and width.
DIN ENGL – Free Download PDF
The associatod numbers show the amount bv which the rating number is to be increased, with increasing frequency. 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. With this nethcrd, the alea of the polished section of the specimc,n to be evaluatod strall be at least nrmz.
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 550602 classification of globular inclusions, insofar they are not represented in diagram plate No.
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 factors obtained on the basis of the Zn-a goometlic series for tho other rating numbers are to be rounded so that, in sin calculatlon, it is only necessaryr to double or halve the numbers.
An index proportional to the content of inclursions from a specified limit slze upwards can be calculated separately for the oxide and sulfide ,components or ,as a total value. Th and therefore is to be measu V 7.
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 image field. This standard specifies 50062 method to be applied using a metallurgical microscope and 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 Converted to a polished section area ol mm2 and rounde to the nearest whole nulnbers.
The specimen can be observed either through ths eyepiece or on a proiection on a ground glass screen. On the basis of experience the rules given in table 5 for guidance have been drawn up, which should as far as possible be used as a basis when agreeing on the method of evaluation.
The ein total indices or the ovirall total index reprss nt the degree of purity of the test unit examined. With this procedure, the larger inclusions are more accurately ovaluated, Table 6 gives the factors to be userJ in the calculations.
DIN 50602 ENGL
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. Since such inclusions usr. These numerical relationships are shown in a graph in figure 2.
When using diagram plates Nos. Which of the two methods is to be used, shall be specified in the rplevant deliverv condition.
I if possible, 80mm in diameter; fields with a diameter between 75 and 80 mm are however permitted. 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. The right-hand column of diagram trlate No. 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.
For calculation of the total indices the procoduro is as follows see also examples glven in tables?
Non-metallic inclusions observed in such cases are to be rated on the basis of the inclusion length given below each diagram, Unless otherwise agreed, even larger inclusions of the same or of greater thickness tharn those shown are all to be classifiod under rating number 9.
These numbers are then genorally in ranges which, for examplo in the case of mothod Krl’, srrt not recorded, but still ari’e to bo teken lntcl accoltnt for column of diagram plate No. 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. Over 60 nrm Wldth?