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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It can therefore only give att approxirnatc indicatiott of tho oliginal plate. Cnnvortod to a polished fin area of lnrrn2, Rounded fronr 1 ,Gg to 1,7. K Range of rnting numberrt to kre rrssd ln the evaluation Fr.
I if possible, 80mm in diameter; fields with a diameter between 75 and 80 mm are however permitted.
This figura can be used especially for simplo reading of interpolated values of inclusion length and Diagram plate 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.
The associatod numbers show the amount bv which the fin number is to be increased, with increasing frequency.
With this procedure, the larger inclusions are more accurately ovaluated, Table 6 gives the factors to be userJ in the calculations.
The relevant numbers indicate the amount by which the rating number assigned to the total length, is to be 5602 because of the greater degree of fragmentation see subclause 7. 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 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 result is then to be converted to a section area of mm2, using the following formula: 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 specimen can be observed either through ths vin or on a proiection on a ground glass screen. Diagram plates Nor;,2 and 3, which supplement diagranl plate No. These numerical relationships are shown in a graph 506602 figure 2.
The right-hand column of diagram trlate No. The speclmens shall be taken in accordance ein the specifications given in subclauses 5’2 and 5.
Th and therefore is to be measu 5060 7. 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.
Both mncroscopic and microscopic methods are used for this purpose. Where only separate, predetermined measurement 05602 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.
For tlre evaluation proper, the full scale diagram xin should be used; ‘il1is can be obtainod fronr Eouth Verlag Gmbll ‘ BurygrafonstraBet1″ Berlin 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 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.
Which of the two methods is to be used, shall be specified in the rplevant deliverv condition. 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. I whorr comparing them to the basic series shown irr 56002 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. This is represented by columns 0, 2 and 5, each on the left of a basic column, Similar considerations apply for the evaluation fin thicker inclusions with twice the area.
DIN 50602 ENGL
Microscopic examination can be carried out using a metallurgical microscope and auto. When using diagram plates Nos. With this nethcrd, the alea di the polished section of dim specimc,n to be evaluatod strall be at least nrmz.
For obssrvation of very thin inclusions, it is advisable to use a magniflcation of x The two total indices or the ovirall total index reprss nt the degree of purity of the test unit examined.
DIN ENGL – Free Download PDF
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. There is also provision for determining maximunr sizes.
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.
These values serves as indlces for the “degree of purity” of the guantity of dkn submittod for testing under the conditions existing.