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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Since such inclusions usr. This figura can be used especially for simplo reading of dni values of inclusion length and Diagram plate No. When using diagram plates Nos.
It can therefore only give att approxirnatc 550602 of tho oliginal plate. The dellvery conditions rnay specify a ditferent number of specinnens. This result is then to be converted to a section area of mm2, using the following formula: The values obtained in the two cases should if possible be integers and for this reason rhould be rounded, if necessarY. In such cases, the rating number is to be increased bv 1.
The width of the inclusion is to be assessed in accordance with diagram plate No. This figure can be used especially foisimple regding of interpolated values of inclusion longth and width. Th and therefore is to be measu V 7. K Range of rnting numberrt to kre rrssd ln the evaluation Fr. 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.
DIN ENGL – Free Download PDF
The right-hand column of diagram trlate No. This magnification field under observation shall be of the same size as tho referencs diagrams of plate No. 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.
Cnnvortod to a polished section area of lnrrn2, Rounded fronr 1 ,Gg to 1,7. Which of the two methods is to be used, shall be specified in the rplevant deliverv condition.
For obssrvation of very thin inclusions, it is advisable to use a magniflcation of x 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.
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 speclmens shall be taken in accordance with the specifications given in subclauses 5’2 and 5. Converted to a polished section area ol mm2 and rounde to the nearest whole nulnbers. Microscopic examination can be carried out using a metallurgical microscope and auto.
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. Over 60 nrm Wldth? 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.
The specimen can be observed either through ths eyepiece or on a proiection on a ground glass screen.
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 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 50602 ENGL
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 reproduction is intendecl tct show that loosely grorJped stt’ings are to bo assignecl lower rating numbors corresponding to the arer of oxides contained. 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.
It is not permittod 506022 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.