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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Such a magnification is equal to the scale on which diagram plate Nos,? Both mncroscopic and microscopic methods 5062 used for this purpose.
The specimen can be observed either through ths eyepiece or on a proiection on a ground glass screen. Which of the two methods is to be used, shall be specified in the rplevant deliverv condition.
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. These values serves as indlces 5002 the “degree of purity” of the guantity of matorial submittod for testing under the conditions existing. 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.
Cnnvortod to a polished section area of lnrrn2, Rounded fronr 1 ,Gg to 1,7. The associated numbers show the amount by which the rating numbor is to be increased, with increasing frequency. 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.
It can therefore only give att approxirnatc indicatiott of tho oliginal plate. These di relationships are shown in 506002 graph in figure 2. For tlre evaluation proper, the full scale diagram plate should be used; ‘il1is can be obtainod fronr Eouth Verlag Gmbll ‘ BurygrafonstraBet1″ Berlin This figure 506602 be used especially foisimple regding of interpolated values of inclusion longth and width.
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 idn steels see subclause 5. With this nethcrd, the alea of the polished section of the specimc,n to be evaluatod strall be at least nrmz.
For calculation of the total indices the procoduro is as follows see also examples glven in tables? This magnification field under observation shall be of the same size as tho referencs diagrams of plate No. There is also provision for determining maximunr sizes.
The right-hand column of diagram trlate 500602.
The two total indices or the ovirall total index reprss nt the degree of purity of the test unit examined. Converted to a polished section area ol mm2 and rounde to the nearest whole nulnbers. For obssrvation of very thin inclusions, it is advisable to use a magniflcation of x 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.
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 number 9.
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. When using diagrant plates Nos.
Relationship between true width, true length and sizc rating number for the inclusions referrod to in tables 2 djn 3 congidered necessrtry to reprosent individual sulfidic inclusions.
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.
When using diagram plates Nos. The dellvery conditions rnay specify a ditferent number of specinnens.
DIN ENGL – Free Download PDF
The width of the inclusion is to be assessed in accordance with diagram 05602 No. This standard specifies a method to be applied using 05602 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 The dib 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.
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.
K Range of rnting numberrt to kre rrssd ln the 506602 Fr. The associatod numbers show the amount bv which the rating number is to be increased, with increasing frequency. Th and therefore is to be measu V 7.
DIN 50602 ENGL
The length, and in column 6 also the width, are marked on the dlagrams in plate No. 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 550602 mads in ascordanco with the basic series of For a classification of globular inclusions, insofar they are not represented in diagram plate No.
Diagram plates Nor;,2 and 3, which supplement diagranl plate No. In such cases, the rating number is to be increased bv 1. 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.
Microscopic examination can be carried out using a metallurgical microscope and auto.