It can therefore only give att approxirnatc indicatiott of tho oliginal plate.The dellvery conditions rnay specify a ditferent number of specinnens. Both mncroscopic and microscopic methods are used for this purpose. 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 specimen can be observed either through ths eyepiece or on a proiection on a ground glass screen. DIN ENGL – Free Download PDFFor calculation of the total indices the procoduro is as follows see also examples glven in tables? 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.These values serves as indlces for the “degree of purity” of the guantity of matorial submittod for testing under the conditions existing.įor obssrvation of very thin inclusions, it is advisable to use a magniflcation of x The right-hand column of diagram trlate No. The length, and in column 6 also the width, are marked on the dlagrams in 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. With this nethcrd, the alea of the polished section of the specimc,n to be evaluatod strall be at least nrmz. 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.Microscopic examination can be carried out using a metallurgical microscope and auto. 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 reproduction is intendecl tct show that loosely grorJped stt’ings are to bo assignecl lower rating numbors corresponding to the arer of oxides contained.
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