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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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.
Such a magnification is equal to the scale on which diagram plate Nos,? With this nethcrd, the alea of the polished section of the specimc,n to be evaluatod strall be at least nrmz. This standard specifies a 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 Both mncroscopic and microscopic methods are used for this purpose.
In such cases, the rating number is to be increased bv 1.
The values dln in the two cases should if possible be integers and for this reason rhould be rounded, if necessarY. This figura can be used especially for simplo reading of interpolated values of inclusion length and Diagram plate No.
DIN 50602 ENGL
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 vin been mads in ascordanco with the basic series of For a classification of globular inclusions, insofar they are not represented in diagram plate No. These numbers are then genorally in ranges which, for examplo in the case of mothod Krl’, srrt not recorded, but still ari’e to 5062 teken lntcl accoltnt for column of diagram plate No.
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.
These numerical relationships are shown in a graph in figure 2. The length, and in column 6 also the width, are marked on the dlagrams in plate No. 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.
When using diagram plates Nos. There is also provision for determining maximunr sizes. The width of the inclusion is to be assessed in accordance with diagram plate 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. The two total indices or the ovirall total index reprss nt the degree of purity of the test unit examined.
This result is then to be converted to a section area of mm2, using the following formula: 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.
DIN ENGL – Free Download PDF
These 5602 serves as indlces for the “degree of purity” of the guantity of matorial submittod for testing under the conditions existing. Relationship between true width, true length and sizc rating number for the inclusions referrod to in dim 2 and 3 congidered necessrtry to reprosent individual sulfidic inclusions. Th and therefore is to be measu V 7. 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.
This magnification field under observation shall be of the same size as tho referencs diagrams of plate No. Diagram plates Nor;,2 and 3, which supplement diagranl plate No.
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.
The speclmens shall be taken in accordance with the specifications given in subclauses 5’2 and 5. Microscopic examination can be carried out using a metallurgical microscope and auto. The specimen can be observed either through ths eyepiece or on a proiection on a ground glass screen. 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.
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 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.
For tlre evaluation proper, the full scale diagram plate should be used; ‘il1is can be obtainod fronr Eouth Verlag Gmbll ‘ BurygrafonstraBet1″ Berlin When using diagrant plates Nos. This figure can be used especially foisimple regding of interpolated values of inclusion longth and width. For obssrvation of very thin inclusions, it is advisable to use a magniflcation of x It can therefore only give att approxirnatc indicatiott of tho oliginal plate.
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. I if possible, 80mm in diameter; fields with a diameter between 75 and 80 mm are however permitted. Cnnvortod to a polished section area of lnrrn2, Rounded fronr 1 ,Gg to 1,7.
The associatod numbers show the amount bv which the rating number is to be increased, with increasing frequency. 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. 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.
Since such inclusions usr. Which of the two methods is to be used, shall be specified in the rplevant deliverv condition.