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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Microscopic examination can be carried out using a metallurgical microscope and auto. The right-hand column of diagram trlate No.
DIN ENGL – Free Download PDF
K Range of rnting numberrt to kre rrssd ln the evaluation Fr. Inclusions dkn 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. Both mncroscopic and microscopic methods are used for this purpose. 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.
With this procedure, the larger inclusions are more accurately ovaluated, Table 6 gives the factors to be userJ in the calculations. This figura can be used especially for simplo reading of interpolated values of inclusion length and 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.
The values obtained in the two cases should if possible be integers and for this reason rhould be rounded, if necessarY. The two total indices or the ovirall total index reprss nt the degree of purity of the test unit examined. 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 This result is then to be converted to a section area of mm2, using the following formula: The dellvery conditions rnay specify a ditferent number of specinnens.
For calculation of the total indices the procoduro is as follows see also examples glven in tables? 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.
Diagram plates Nor;,2 and 3, which supplement diagranl plate No. It is not permittod to give fractions to indicate the inclusion rating e. 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. Since such inclusions usr. 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 scale on which diagram plate Nos,? 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 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. 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.
I whorr comparing them to the basic series shown irr ptate No. Over 60 nrm Wldth?
The associatod numbers show the amount bv which the rating number is to be increased, with increasing frequency. The width of the inclusion is to be assessed in accordance with diagram plate No. The specimen can be observed either through ths eyepiece or on a proiection on a ground glass screen.
These values serves as indlces for the “degree of purity” of the guantity of matorial submittod for testing under the conditions existing. On the basis of 50620 the rules given in table 5 for guidance have been drawn up, which should as far as xin be used as a basis when agreeing on the method of evaluation.
This figure can be used especially foisimple regding of interpolated values of inclusion longth and width. With this nethcrd, the alea of the polished section of the specimc,n to be evaluatod strall be at least nrmz. 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.
DIN 50602 ENGL
The length, and in column 6 also the width, are marked on the dlagrams in plate No. These numerical relationships are shown in a graph in figure 2. This magnification field under observation shall be of the same size as tho referencs diagrams of plate No. In such cases, the rating number is to be increased bv 1. 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.
Th and therefore is to be measu V 7. For obssrvation of very thin inclusions, it is advisable to use a magniflcation of x Which of the two methods is to be used, shall be specified in the rplevant deliverv condition.
The factors obtained on the basis of the Zn-a goometlic series for tho other rating numbers are to rin rounded so that, in the calculatlon, it is only necessaryr to double or 05602 the numbers. 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 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.
There is also provision for determining maximunr sizes. Cnnvortod to a polished section area of lnrrn2, Rounded fronr 1 ,Gg to 1,7.