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.
Which of the two methods is to be used, shall be specified in the rplevant deliverv condition. 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. The length, and in column 6 also the width, are marked on the dlagrams in plate No. This magnification field under observation shall be of the same size as tho referencs diagrams of plate No.
K Range of rnting numberrt to kre rrssd ln the evaluation Fr. The speclmens shall be taken in accordance with the specifications given in subclauses 5’2 and 5. Diagram plates Nor;,2 and 3, which supplement diagranl plate No. Both mncroscopic and microscopic methods are used for this purpose. This figura can be used especially for simplo reading of interpolated values of inclusion length and Diagram plate No.
For obssrvation of very thin inclusions, it is advisable to use a magniflcation of x With this nethcrd, the alea of the polished section of the specimc,n to be evaluatod strall be at least nrmz. 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.
The associatod numbers show the amount bv which the rating number is to be increased, with increasing frequency. These numerical relationships are shown in a graph in figure 2.
It can therefore only give att approxirnatc indicatiott of tho oliginal plate.
When using diagram plates Nos. The values obtained in the two cases should if possible be integers and for this reason rhould be rounded, if necessarY. There is also provision for determining maximunr sizes.
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. 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.
Th and therefore is to be measu V 7. 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 specimen can be observed either through ths eyepiece or on a proiection on a ground glass screen. In such cases, the rating number is to be increased bv 1. Over 60 nrm Wldth? This result is then to be converted to a section area of mm2, using the following formula: It is not permittod to give fractions to indicate the inclusion rating e.
With this procedure, the larger inclusions are more accurately ovaluated, Table 6 gives the factors to be userJ in the calculations. 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.
The associated numbers show the amount by which the rating numbor is to be increased, with increasing frequency. 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. The right-hand column of diagram trlate 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. I whorr comparing them to the basic series shown irr ptate No. 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.
DIN ENGL – Free Download PDF
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. Converted to a polished section area ol mm2 and rounde to the nearest whole nulnbers. The two total indices or the ovirall total index reprss nt the degree of purity of the test unit examined. 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 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 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.
In the cass of lo,w-carbon steels and stainless steelg with no transformation, it is necessary to take into account the special properties of such steels see subclause 5. 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.
For tlre evaluation proper, the full scale diagram plate should be used; ‘il1is can be obtainod fronr Eouth Verlag Gmbll ‘ BurygrafonstraBet1″ Berlin These values serves as indlces for the “degree of purity” of the guantity of matorial submittod for testing under the conditions existing. 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.
DIN 50602 ENGL
International standard lsoStoel; determination of content of non-metallic incluslons; micrographic method diin standard diagrams tl has been issued by the International organization for standardization tisot.
The dellvery conditions rnay specify a ditferent number of specinnens. When using diagrant plates Nos.