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 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. The length of an oxidic inclusion in the case of OA inclusions is greater di that for OS inclusions of the same width, because for a given rating number, the aroa vrrould otherwise be dlfferent.
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 whorr comparing them to the basic series shown irr ptate No. The length, and in column 6 also the width, are marked on 506602 dlagrams in plate No. Microscopic examination can be carried out using a metallurgical microscope and auto.
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. In such cases, the rating number is to be increased bv 1.
DIN 50602 ENGL
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 7,2. The values obtained in the two cases should if possible be integers and for this reason rhould be rounded, if necessarY. K Range of rnting numberrt to kre rrssd ln the evaluation Fr.
Rating number 9 is 5060 for macroscopic inclusions, which are not shown in diagrammatic form, becauss they would extend bsyond the limits of the image field. Which of the two methods is to be used, shall be specified in the rplevant deliverv condition. Since such dinn usr. 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. With this nethcrd, the alea of the polished section of the specimc,n to be evaluatod strall be at least nrmz.
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.
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.
It can therefore only give att approxirnatc indicatiott of tho oliginal plate. 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 is not permittod to give fractions to indicate the inclusion rating e. These numerical relationships are shown in a graph in figure 2. There is also provision for determining maximunr sizes.
dinn This figure can be used especially foisimple regding of interpolated values of inclusion longth 506602 width. With this procedure, the larger inclusions are more accurately ovaluated, Table 6 gives the factors to be userJ in the calculations. 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 5060 9.
Where only separate, predetermined measurement fields or parts of measurement field within the polished section 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.
DIN ENGL – Free Download PDF
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. Such a magnification is equal to the xin on which diagram plate Nos,? These values serves as indlces for the “degree of purity” of the guantity of matorial submittod for testing under the conditions existing.
For tlre evaluation proper, the full scale diagram plate should be used; ‘il1is can be obtainod fronr Eouth Verlag Gmbll ‘ BurygrafonstraBet1″ Berlin Diagram plates Nor;,2 fin 3, which supplement diagranl plate No. The specimen can be observed either through ths eyepiece or on a proiection on a ground glass screen. This figura can be used especially for simplo reading of interpolated values of inclusion length and Diagram plate No.
The width of the inclusion is to be assessed in accordance with diagram plate No. I if possible, 80mm in diameter; fields with a diameter between 75 and 80 mm are however permitted. The right-hand column of diagram trlate No. When using diagrant plates Nos. Converted to a polished section area ol mm2 and rounde to the nearest whole nulnbers. Th and therefore is to be measu V 7. For calculation of the total indices the procoduro is as follows see also examples glven in tables?
This result is then to be converted to a dun area of mm2, using the following formula: When using diagram plates Nos.