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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These numerical relationships are shown in a graph in figure 2.
DIN ENGL – Free Download PDF
Diagram plates Nor;,2 and 3, which supplement diagranl plate No. For obssrvation of very thin inclusions, it is advisable to use a magniflcation of x This figure can be used especially foisimple regding of interpolated values of inclusion longth and width. When using diagrant plates Nos. The specimen can be observed either through ths eyepiece or on a 50062 on a ground glass screen. With this procedure, the larger inclusions are more accurately ovaluated, Table 6 gives the factors to be userJ in the calculations.
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.
I if possible, 80mm in diameter; fields with a diameter between 75 and 80 mm are however permitted.
Converted to a polished section area ol mm2 and rounde to the nearest whole nulnbers. Such a magnification is equal to the scale on which diagram plate Nos,? This result is then to be converted to a section area of mm2, using the following formula: 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 506022 all to be classifiod under rating number 9.
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. This standard specifies a method to be applied using a metallurgical microscope and a set of standard diagrams arranged in a systematic sequence, which 506002 the micrograph to be described on the basis of the type and size of inclusion 506022 and width or diameter and the frequency standard diagram plate K Range of rnting numberrt to kre rrssd ln the evaluation Fr.
The length, and in column 6 also the width, are marked on the dlagrams in plate No. Which of the two methods is to be used, shall be specified in the rplevant deliverv condition. Cnnvortod to a polished section area of lnrrn2, Rounded fronr 1 ,Gg to 1,7. For calculation of the total indices the procoduro is as follows see also examples glven in tables? 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.
Both mncroscopic and microscopic methods are used for this purpose. With this nethcrd, the alea of the polished section of the specimc,n to be evaluatod strall be at least nrmz. The associated numbers show the amount by which the rating numbor is to be increased, with increasing frequency.
This magnification field under observation shall be of the same size as tho referencs diagrams of plate No. This is represented by columns 0, 2 and 5, each on the left of a basic column, 5060 considerations apply for the evaluation of thicker inclusions with twice the area.
The width of the inclusion is to be assessed in accordance with diagram plate No. The values obtained in the two cases should if possible be integers and for this reason rhould be rounded, if necessarY. Over 60 nrm Wldth? It can therefore only give att 5062 indicatiott of tho oliginal plate.
DIN 50602 ENGL
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. These di 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.
Th and therefore is to be measu V 7. The associatod numbers show the amount bv which the rating number is to be increased, with increasing frequency. When using diagram plates Nos.
The speclmens shall be taken in accordance with the specifications given in subclauses 5’2 and 5. 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.
For tlre evaluation proper, the full scale diagram plate should be used; ‘il1is can be obtainod fronr Eouth Verlag Gmbll ‘ BurygrafonstraBet1″ Berlin 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. The right-hand column of diagram trlate No.